39 results on '"Hartvig C"'
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2. Lack of sea urchin settlement may explain kelp forest recovery in overgrazed areas in Norway
- Author
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Fagerli, Camilla With, Norderhaug, Kjell Magnus, and Christie, Hartvig C.
- Published
- 2013
3. Rinde et al. 2022 feltbasert kunnskap lokalitetskvalitet 7691-2022
- Author
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E. Rinde, Moy, Siri, Tveiten, Lise Ann, Kvile, Kristina ��ie, Walday, Mats, Christie, Hartvig C., Brkljacic, Marijana, Kile, Maia R��st, Bekkby, Trine, Gitmark, Janne, Mjelde, Marit, Fagerli, Camilla W, Oug, Eivind, and D'Auriac, Marc Angl��s
- Published
- 2022
- Full Text
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4. Environmental impacts of the diver operated C disc to harvest sea urchins and for kelp restoration
- Author
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Michelsen, Helena Kling, Fagerli, Camilla With, and Christie, Hartvig C
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Miljøundersøkelse ,Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Suction device ,Restoration ,Undervannsstøvsuger ,Environmental survey ,Kråkeboller ,Restaurering ,Sea urchins - Abstract
Project Manager Helena Kling Michelsen NIVA did a 2-day environmental evaluation of the diver operated suction device “C disc” constructed by C robotics. Because the C disc uses suction from a water pump to suck sea urchins from the seafloor, it will collect bycatch and may have some harmful effects on the seafloor. It can also be used for kelp restoration in northern-Norway. This survey tested the C disc at two sea urchin barren grounds around Tromsø (Ytre Kårvika, Kvalsundet and Berg, Balsfjord) in May 2021. Analysis of catch efficiency on target sea urchins, bycatch and effects on the sea floor using video transects and frame counts was done at both sites. About 81 – 89 % of the catch consisted of the target species sea urchins and the CPUE was on average 78 ind./min (61 – 96 ind./min). Of these 11 % were damaged by the C disc. Bycatch accounted for 11 and 19 % of the catch and reflected the local community consisting of mainly larger loose sitting organisms. There was little to no damage observed on bycatch organisms, except for barnacle and blue mussels. There was a reduction in loosely fastened organisms after using the C disc, and the most impacted organisms reflected the bycatch. If the bycatch is kept in sea water and returned to sea soon after capture, they are likely to survive. The survey is only representative for hardbottom sea urchin barrens in northern-Norway.
- Published
- 2022
5. Utvikling av kartleggingsmetodikk og kriterier for lokalitetskvalitet for marine naturtyper
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Rinde, Eli, Moy, Siri Røang, Borgersen, Gunhild, Brkljacic, Marijana Stenrud, Fagerli, Camilla With, Gitmark, Janne Kim, Mjelde, Marit, Bekkby, Trine, Bjorbækmo, Marit Frederikke Markussen, Christie, Hartvig C, Kile, Maia Røst, Næss, Rita, Oug, Eivind, Tveiten, Lise Ann, and Walday, Mats Gunnar
- Subjects
Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Mapping ,Metodeutvikling ,Ecological status ,Økologisk tilstand ,Method development ,Marint biologisk mangfold ,Kartlegging ,Marine biodiversity - Abstract
Prosjektleder Eli Rinde Dette arbeidet er en videreføring av påbegynt arbeid fra 2020 og 2021 knyttet til kunnskap og metodeutvikling for kartlegging av marine naturtyper og for å kunne beskrive naturtypelokaliteters økologiske kvalitet. Arbeidet i 2022 har hatt søkelys på grunn bløtbunn, ålegrasenger og andre undervannsenger, tangsamfunn, sukkertareskog, stortareskog, ruglbunner, helofyttsaltvannssump,sterke tidevannsstrømmer og korallrev/sjøfjærsamfunn. I Oslofjorden har tidligere kartlagte forekomster av enkelte naturtyper, blitt re-kartlagt. Miljødirektoratet
- Published
- 2022
6. KELPMAP-Vega: Metodeutvikling for kartlegging av tareskog ved bruk av droner og satellittbilder (feltrapport)
- Author
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Gundersen, Hege, Hancke, Kasper, Poulsen, Robert Nøddebo, Buls, Toms, Ghareeb, Medyan, Christie, Hartvig C, Kile, Maia Røst, Arvidsson, Karoline Slettebø, and Kvile, Kristina Øie
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Habitat mapping ,Tareskog ,Bakkesannheter ,Habitatkartlegging ,Kelp forest ,Ground truthing ,Drone UAV Unoccupied Aerial Vehicle - Abstract
Prosjektleder Hege Gundersen Rapporten er en del-leveranse i prosjektet "Metodeutvikling for kartlegging av tare ved bruk av droner og satellittbilder" og beskriver metoder for innsamling av høyoppløselige bilder ved hjelp av droner og generering av sammenhengende georefererte ortofoto, samt innhenting av bakkesannheter og sammenstilling av disse. Feltarbeidet er utført i Vega og Herøy kommuner på Helgelandskysten i Nordland fylke. Kriterier for hva som karakteriserer gode forhold for innsamling av data med droner er beskrevet, og inkluderer i hovedsak lysforhold, vannstand, vind, og skydekke. Utstyr for innhenting av bakkesannheter og droneflyging er også gitt. Det konkluderes at nøye feltplanlegging og egnede værforhold er avgjørende for suksessfull gjennomføring av et slikt feltarbeid. En retrospektiv analyse av værforholdene for droneflyving på Vega i august 2022 er inkludert. Endelig rapport for prosjektet er planlagt ferdigstilt november 2023. Miljødirektoratet
- Published
- 2022
7. Kartlegging av et utvalg marine naturtyper i Oslofjorden
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Rinde, Eli, Bekkby, Trine, Kvile, Kristina Øie, Andersen, Guri Sogn, Brkljacic, Marijana Stenrud, Anglès d'Auriac, Marc, Christie, Hartvig C, Fagerli, Camilla With, Fredriksen, Stein, Moy, Siri Røang, Staalstrøm, Andre, and Tveiten, Lise Ann
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Eelgrass ,Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Ecological status ,Økologisk tilstand ,Saccharina latissima ,Sukkertare ,Ålegras ,Natur i Norge ,Nature in Norway - Abstract
Formålet med prosjektet har vært å skaffe kunnskap om et utvalg marine naturtyper i Oslofjorden, og samtidig skaffe praktisk erfaring med NiN-systemet som verktøy for å dekke miljøforvaltningens behov. Gjennom feltkartlegging har vi skaffet kunnskap om endringer i naturtyper som er kartlagt tidligere i Nasjonalt program for kartlegging av biologisk mangfold - kyst. Dette omfatter ålegrasenger og bløtbunnsområder i strandsonen i indre deler av fjorden. I tillegg er det foretatt kartlegging av sukkertareskog i ytre del, og undersøkelse av en antatt forekomst av ruglbunn nær Håøya. Det er utført et omfattende modelleringsarbeid som grunnlag for feltdesign og prioritering av framtidig kartlegging av forvaltningsrelevant natur i fjorden.
- Published
- 2021
8. Bispevika. Vurdering av vannutskiftning og miljøforhold i vannbasseng B6b
- Author
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Walday, Mats Gunnar, Molvær, Jarle, Rinde, Eli, Sørensen, Elin Tanding, Christie, Hartvig C, and Leikvin, Øyvind
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Vannkvalitet ,Vegetation ,Water quality ,Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Bispevika ,Begroing ,Development ,Utbygging - Abstract
Prosjektleder Mats Walday Oslo S Utvikling (OSU) arbeider med detaljplan for utbygging i Bispevika, med utfylling og bebyggelse i nordøstre del. Her inngår bl.a. to bassenger med innløp fra Bispevika. Det er viktig at bassengene har tilstrekkelig vannutskiftning slik at man unngår sterk begroing og dårlig vannkvalitet. OSU har begynt planleggingen av søndre basseng (B6b), og denne rapporten gir en vurdering av vannutskiftning og miljøforhold med følgende hovedpunkt: 1. Innledende vurderinger, idealiseringer, erfaringer fra B6a inkl. ROV-inspeksjon, faglig tillit – forhold rundt vannsirkulasjon og vannøkologi. 2. Sammenligne situasjon i Reguleringsplan (2014) vs. ny Situasjon i Rammesøknad (2020), som det er søkt dispensasjon for.
- Published
- 2020
9. Distribution and ecological state of a nationally important eelgrass bed in Slependrenna in Asker and Bærum municipality
- Author
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Brkljacic, Marijana Stenrud, Rinde, Eli, and Christie, Hartvig C
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Eelgrass ,Status assessment ,Mapping ,Slependrenna Inner Oslofjord ,Tilstandsvurdering ,Ålegras ,Kartlegging ,Slependrenna Indre Oslofjord - Abstract
Prosjektleder Eli Rinde Observasjoner mai 2013 viste fravær av ålegras i den tidligere kartlagte nasjonalt viktige ålegrasenga i Slependrenna. På oppdrag fra Fylkesmannen i Oslo og Akershus har vi gjort oppfølgende undersøkelser for å observere utbredelsen og tilstanden til denne ålegrasenga. Feltundersøkelser utført i 2017, 2018 og 2019 har dokumentert at ålegrasenga ikke har blitt permanent tapt. Undersøkelsene viste tett forekomst av ålegras i enga i hvert av de undersøkte årene. Imidlertid var ålegrasenga tidvis sterkt preget av trådalger, noe som er en kjent trussel for ålegrasenger. I tillegg ble det funnet en relativt stor utbredelse og forekomst av den fremmede rødalgen Gracilaria vermiculophylla på de dypeste partiene i enga. Spredning av denne arten utgjør en høy økologisk risiko for beskytta økosystemer som de som finnes i Slependrenna. Truslene knyttet til overgjødsling, trådalger, og funn av en svartelistet art med høy økologisk risiko, kommer på toppen av andre kjente trusler som utbygging, småbåthavn, etablering av kunstige sandstrender, global oppvarming og forsuring. Summen av disse forholdene gjør at trusselbildet for ålegrasenga i området er svært høyt.
- Published
- 2020
10. Regrowth of kelp after removal of sea urchins (Strongylocentrotus droebachiensis)
- Author
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Carlsson, Pernilla Marianne and Christie, Hartvig C
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Tare ,Tarehøsting ,Kelp ,Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Northern Norway ,Kråkeboller ,Nord-Norge ,Kelp harvesting ,Sea urchins - Abstract
Project manager Pernilla Carlsson With few natural predators, green sea urchins (Strongylocentrotus droebachiensis) have grown in numbers, grazed down large kelp forest areas in Northern Norway into urchin barrens. NIVA deployed three underwater cages outside Tromsø, Northern Norway during Autumn 2018, removed all urchins within these cages and followed the cages closely until Summer 2019. The first kelp individual was observed in the middle of March, and by the end of May, the seafloor in the cages were covered with 80-100% of algae, especially brown algae Desmarestia sp. and Alaria esculenta. Sugar kelp (Saccharina latissima) was also present. The study showed that kelp species could re-establish in cages where sea urchins were kept at low abundance. However, once kelp had re-established, the area inside the cages increased in interest for the sea urchins, who climbed into the cages and grazed on the algae. This small scale pilot-project would need an up-scaling of cage sizes and cleaning efforts to improve the survival rate of the kelp. At present, the density of urchins in Troms are probably sufficiently high to allow a sustainable sea urchin harvesting. However, research is needed to assess the required harvested amount of sea urchins to promote kelp forest recovery, and at the same time allow the sea urchin industry to have access to their resources.
- Published
- 2019
11. De allestedsnærværende kalkalgene - et svært, rosa kunnskapshull langs norskekysten?
- Author
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Rinde, Eli, Peña, Viviana, Le Gall, Line, Anglès D’auriac, Marc B., Hall-Spencer, Jason M., Steneck, Robert S., Gitmark, Janne, Husa, Vivian, Grefsrud, Ellen Sofie, Fredriksen, Stein, Bekkby, Trine, Christie, Hartvig C, and Marani, Gilberto
- Subjects
[SDV] Life Sciences [q-bio] ,[SDV.BID.SPT] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy ,[SDV.BV] Life Sciences [q-bio]/Vegetal Biology ,[SDV.BBM.BM] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology ,[SDV.BID] Life Sciences [q-bio]/Biodiversity - Published
- 2019
12. Accesibilidad y adherencia a drogas biológicas en un servicio público de reumatología de la ciudad de Rosario, Santa Fe, Argentina
- Author
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Quintana, R., Navarro, S., Nieto, R., Hartvig, C., Aeschlimann, C., Bersano, N., and Sacnún, M.
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tratamiento ,treatment ,enfermedades reumáticas ,rheumatic diseases ,adherence ,adherencia ,drogas biológicas ,accesibilidad ,accessibility ,biological drugs - Abstract
Objetivo: Describir la situación de accesibilidad y adherencia a tratamientos con drogas biológicas en pacientes de un servicio público de reumatología. Métodos: Estudio de corte transversal, observacional y retrospectivo que incluyó pacientes con gestión de DB. Variables: sociodemográficas, clínicas, tratamientos, tiempo desde el diagnóstico al acceso, adherencia (porcentaje de toma mensual y adecuada de la droga ≥75%); tiempo desde prescripción a administración; trámite administrativo realizado por entidad pública u obra social; certificado único de discapacidad (CUD). Resultados: Se incluyeron 57 pacientes, 86% mujeres, edad media 47,79 años (IC 95%: 44,46-51,12); educación media 8,42 años (IC 95%: 7,68-9,16); 82,5% nivel socioeconómico medio-bajo; 63,2% etnia mestiza; 19,3% cobertura privada. Patología más frecuente: artritis reumatoidea. Tiempo medio desde el diagnóstico a la DB: 104,25 meses (IC 95%: 82,61-125,89). Tiempo medio desde la prescripción a la aplicación: 6,4 meses (IC 95%: 5,62-7,18). Adherencia del 86,0%. 50% de los pacientes contaban con CUD. No hubo diferencias en el tiempo de espera desde prescripción a administración de DB, en relación a cobertura de salud (p=0,065) y nivel socioeconómico. Conclusión: Existe un largo tiempo de evolución de la enfermedad en relación a la accesibilidad a DB y tanto el acceso como la adherencia reflejan la vulnerabilidad de estos pacientes. Objective: To describe the situation of accessibility and adhesion treatment of patients with biological drugs (BD) from a public rheumatology service. Methods: Cross-sectional, observational and retrospective study, which includes patients who have been treated with BD. Variables: sociodemographic; clinical and treatments; time from diagnosis to BD access, adherence (monthly intake percentage of the drug ≥75%); time from the prescription to the administration of the BD; paperwork by a public or private entity; disability certificate (DC). Results: A total of 57 patients were included, 86% women, mean age being 47.79 (95% CI: 44.46-51.12) and education years being 8.42 (95% CI: 7.68- 9.16). 82.5% belonged to a medium-low socioeconomic status and 63.2% were mestizos. 19.3% had private coverage. Rheumatoid Arthritis was the most frequent disease. The mean time from diagnosis to BD: 104.25 months (95% CI: 82.61-125.89). The mean time from prescription to application: 6.4 months (95% CI: 5.62-7.18). The adherence was 86.0% and 50.0 % of patients had DC. There were no differences in the waiting time from the prescription to BD administration, taking into account the health coverage (p = 0.065) and socioeconomic status. Conclusion: There is a long time of disease evolution in regarding the accessibility to BD. In addition, accessibility and adherence reflect the vulnerability of our patients.
- Published
- 2018
13. Norways hidden marine biodiversity: the hunt for cryptic species within the coralline algae
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Rinde, Eli, Anglès D’auriac, Marc B., Bekkby, Trine, Christie, Hartvig C, Gitmark, Janne, Grefsrud, Ellen Sofie, Hallspencer, Jason M., Husa, Vivian, Le Gall, Line, Peña, Viviana, Steneck, Robert S., and Marani, Gilberto
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[SDV] Life Sciences [q-bio] ,[SDV.BID.SPT] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy ,[SDV.BV] Life Sciences [q-bio]/Vegetal Biology ,[SDV.BBM.BM] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology ,[SDV.BID] Life Sciences [q-bio]/Biodiversity - Published
- 2018
14. Vurdering av spredning av partikler fra Aksla steinbrudd
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Staalstrøm, Andre, Kristiansen, Trond, Christie, Hartvig C, and Staalstrøm, André - Project manager
- Subjects
Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Partikkelspredning ,Sogn og Fjordane ,Particle dispersion ,Gruvedrift ,OpenDrift ,Sogn and Fjordane County ,Mining - Abstract
Spredning av steinstøv fra planlagt utskipningskai ved Bårdvikneset i Frøysjøen er i dette prosjektet modellert med havmodellen ROMS og verktøyet OpenDrift som beregner partikkelbaner. Partikkelkonsentrasjon i vannmassene og sedimenteringshastighet langs bunn er beregnet. OpenDrift resultatene viser at sedimenteringshastigheten kan bli over 2 mm/år rett under utskipningskaiene, og i et belte langs bunn opp mot munningen til Hennøysundet. Dette vil ha en negativ betydning på dyrelivet nedi bunnen og for tang og tare i disse områdene. Partikkelkonsentrasjonen i vannmassene på den nærmeste låssettingsplassen i Hennøysundet eller ved det nærmeste oppdrettsanlegget ved Løypingneset vil ikke bli høye nok til at dette vil bli et problem for låssatt fisk eller fisk i merder. Oppdrettsanlegg som anlegges nær utskipningskaien vil kunne oppleve forhøyet partikkelkonsentrasjon i overflatelaget. Modellberegningene tyder på at konsentrasjonen kan komme opp mot 6 mg/L i en avstand av ca. 500 m og under 1 mg/L i en avstand av 1500 m fra utskipningskaia. Dispersion of mineral particles from a planned quay at Bårdvikneset in Frøysjøen is modeled in this project with the ROMS ocean model and using the OpenDrift tool that calculates particle tracks. Particle concentration in the water masses and sedimentation rate along the bottom are calculated. The OpenDrift results show that the sedimentation rate can be over 2 mm/year below the quay, and in a belt along the bottom towards the mouth of Hennøysundet. This will have a negative impact on benthic animals and for seaweed and kelp in these areas. The particle concentration in the water masses in Hennøysundet or at the nearest aqua culture site at Løypingneset will not be increased to such levels that this can be a problem for fish in cages. If an aquaculture site is located close to the quay the fish in the cages might experience elevated particulate concentration. The model calculations indicate that the concentration may reach 6 mg/L at approximately 500 m and less than 1 mg/L at a distance of 1500 m from the quay. Multiconsult AS
- Published
- 2017
15. Miljøoppfølging E136 Tresfjordbrua. Sluttrapport
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Borgersen, Gunhild, Brkljacic, Marijana Stenrud, Gitmark, Janne Kim, Golmen, Lars Gunder, Kempa, Magdalena, Ledang, Anna Birgitta, Lømsland, Evy Rigmor, Christie, Hartvig C, and Christie, Hartvig - Project manager
- Subjects
Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Ecological status ,Økologisk tilstand ,Hydrography and water quality ,Tresfjordbrua ,Hydrografi og vannkvalitet ,Current measurements and modelling ,Strømmåling og modellering ,Tresfjord bridge - Abstract
Statens Vegvesen har ferdigstilt bru over Tresfjorden, en utbygging som også omfatter en sjøfylling. NIVA har utført miljøundersøkelser og modellberegninger av forholdene før og etter anleggsvirksomheten for å vurdere om utbygging medførte vesentlige endringer i forholdene i fjorden. Utbyggingen har medført en generell økning i strømhastighet som varierer med vindretning og vindhastighet, men har ikke påvirket temperaturforhold, saltholdighet og bølgeforhold i fjorden. Plante- og dyrelivet i fjæra, og dyrelivet på dypere vann viser ikke tegn på dårligere tilstand etter utbyggingen. Alt i alt viser denne undersøkelsen at brua og utbyggingen ikke har ført til alvorlige konsekvenser for miljøet i fjorden. The Norwegian Public Roads Administration (Statens Vegvesen) has in 2015 compledet a new bridge over the fjord Tresfjord in Møre og Romsdal county. The bridge is approx. 1.2 km long with an 850 m long embankment from Vikebukt. Construction work started in 2012, and Norwegian Institute for Water Research (NIVA) has conducted several surveys of the fjord (2010 and 2011) as a basis to monitor the environment and with follow up surveys (2016 and 2017) after the bridge has been completed. This report presents the results from the after surveys and discuss these in relation to the before results. The discussion and conclusions are presented in a short section in the beginning of the present report, followed by comprehensive presentations of data from the different topics of the surveys. Statens Vegvesen, region Midt
- Published
- 2017
16. Predators of the destructive sea urchin Strongylocentrotus droebachiensis on the Norwegian coast
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Fagerli, Camilla With, Norderhaug, Kjell Magnus, Christie, Hartvig C, Pedersen, Morten Foldager, and Fredriksen, Stein
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animal structures ,Strongylocentrotus droebachiensis ,predator ,Ecology ,biology ,urogenital system ,cancer pagurus ,Kelp ,Cancer pagurus ,Aquatic Science ,biology.organism_classification ,Kelp forest ,kelp recovery ,Predation ,Fishery ,biology.animal ,embryonic structures ,Strongylocentrotus ,Mathematics and natural science: 400 [VDP] ,Laminaria hyperborea ,Pagurus ,Sea urchin ,barren ground ,Ecology, Evolution, Behavior and Systematics - Abstract
In central Norway, populations of the green sea urchin Strongylocentrotus droe- bachiensis are collapsing, but the factors controlling its population density have not yet been elucidated. Through field sampling, we identified several sea urchin predators and investigated their predation rates on recently settled S. droebachiensis in laboratory experiments. Tethering experiments in kelp forest and on barren ground study sites in the area where sea urchin popula- tions are collapsing confirmed predation by some of the predators tested in laboratory experi- ments. The edible crab Cancer pagurus was the most efficient sea urchin predator, and it was more abundant at kelp forest sites than on barren grounds. Stocks of C. pagurus have increased dramatically in central Norway since the 1990s, and predation by C. pagurus may contribute to the decline in sea urchin densities, allowing kelp recovery and conferring resilience of the new kelp forest state.
- Published
- 2014
17. Saltstraumen tidal current; assessing nature values in a marine national park
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Fagerli, Camilla With, Gundersen, Hege, Gitmark, Janne Kim, Staalstrøm, Andre, Christie, Hartvig C, and Christie, Hartvig C - Project manager
- Subjects
Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Naturtyper / Nature types ,Fastsittende dyreliv / Sessile fauna ,Saltstraumen verneområde / Saltstraumen tidal current ,Miljødata / Environmental data - Abstract
Denne undersøkelsen rapporterer naturverdier i Saltstraumen marine verneområde basert på videoregistreringer langs 30 linjer (transekter). Det ble registrert 15 naturtyper (NiN) i området der hardbunn og særlig fast bunn dypere enn 30 m var mest vanlig. Tette forekomster av fastsittende filtrerende dyreliv fra grunt vann og ned til store dyp gjør området unikt. Denne spesielle tidevannsstrømmen bringer med seg næringspartikler som gjør det mulig å opprettholde et mangfoldig og fargerikt dyreliv på fjellvegger over et stort område. Alle registreringene er tilrettelagt i elektroniske vedlegg for videre modellering. En sammenstilling av miljødata viser relativt lite variasjon i saltholdighet og temperatur, men datamaterialet er begrenset. The purpose of this study is to document the habitats and natural values in Saltstraumen marine conservation area and to facilitate data for further modeling in ArcGIS. Nature types (based on “Naturtyper i Norge”, NiN) and occurrence of marine organisms are analyzed from video recordings along 30 lines/transects (performed by NGU, Norges Geologiske Undersøkelse). Also available environmental data (temperature, salinity and currents) are evaluated. ... Fylkesmannen i Nordland
- Published
- 2015
18. Environmental impact assessment of leakage of contaminants from the ship wreck MS 'Raana' in Bremsnesfjorden, Kristiansund N
- Author
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Bakke, Torgeir Heggelund, Golmen, Lars Gunder, Christie, Hartvig C, and Christie, Hartvig C - Project manager
- Subjects
Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Miljøgiftlekkasje / Contaminant leakage ,Vrakfjerning / Shipwreck removal ,Skipsvrak / Shipwreck ,Miljøkonsekvensutredning / Environmental impact assessment - Abstract
NIVA har gjennomført en miljøkonsekvensvurdering av mulige utslipp og utlekking av miljøgifter fra vraket av MS Raana som sank i Bremsnesfjorden utenfor Kristiansund 12. januar 2007. Vurderingen utgjør ett av flere grunnlag for å bedømme om vraket bør fjernes. Flere miljøgifter forventes å forekomme i vraket, men vurderingen er for noen stoffer som PCB, organohalogener og PFAS usikker grunnet for liten informasjon om forekomst ombord. Vurderingen skiller mellom kroniske og akutte utslipp. Olje er vurdert separat fra øvrige stoffer. Samlet indikerer konsekvensvurderingen at utlekking av fremmedstoffer fra vraket av Raana utgjør liten til meget liten risiko for skade på naturmiljøet i Bremsnesfjorden. Utlekking av miljøgiftene vil ikke berøre viktige lokale natur- og fiskeriressurser. Det er usikkert om det finnes olje igjen i havaristen, men det er mest sannsynlig lite/ingen olje igjen, og miljørisikoen er da ubetydelig. Optiship AS and Codan Forsikring - gjensidig have requested the Norwegian Institute for Water Research NIVA to perform an environmental impact assessment of leakage of contaminants from the wreck of MV Raana which sank in Bremsnesfjorden outside Kristiansund, Møre and Romsdal County, on April 17 2014. The ship was built in 1957 as a car and passenger ferry and was later rebuilt to function as work vessel. The wreck lies on soft bottom at 103-104 m depth, apparently in reasonably good condition. The NIVA task has been to assess if the extent of potential leakage of contaminants from Raana is likely to cause an unacceptable impact to the local marine ecosystem at the bottom, in the water column and on the shoreline of Bremsnesfjorden and the marine areas around. This impact assessment constitutes one aspect of the information basis to assess whether or not the wreck should be removed. Optiship AS og Codan Forsikring
- Published
- 2015
19. Accesibilidad y adherencia a drogas biológicas en un servicio público de reumatología de la ciudad de Rosario, Santa Fe, Argentina
- Author
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Quintana, R., primary, Navarro, S., additional, Nieto, R., additional, Hartvig, C., additional, Aeschlimann, C., additional, Bersano, N., additional, and Sacnún, M., additional
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- 2018
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20. Jomfruland nasjonalpark. Sammenstilling av eksisterende kunnskapom marine naturverdier
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Christie, Hartvig C, Rinde, Eli, Gitmark, Janne K., Walday, Mats, and Christie, Hartvig C - Project manager
- Subjects
Nasjonalpark / National park ,Jomfruland / Jomfruland ,Marine naturverdier / Marine nature ,Mathematics and natural scienses: 400::Zoology and botany: 480::Marine biology: 497 [VDP] ,Utredning / Discussion ,Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 [VDP] - Abstract
Til arbeidet med etablering av Jomfruland nasjonalpark har NIVA fått i oppdrag å sammenstille kunnskap om marine naturverdier, med særlig vekt på naturtyper med st or økologisk verdi. De viktigste naturtypene er pr esentert i kart og tabeller med over sikt over størrelse og betydning . I tillegg er naturtypenes viktig e økologisk e funksjon er beskrevet. Nasjonalparkområdet omfatter spesielt store og rike tareskogsområder som har betydning for hele området s kystøkosysteme r og ressurser , og som også bidrar med viktige økosystemtjenester for område r utenfor nasjonalparken . Rapporten har i tillegg hovedfokus på naturtypene å legras enger , bløtbunn sområder i strandsonen , skjellsandforekomster , israndsavsetninger og gyteområder for fisk, men også andre marine naturverdier er beskrevet . Rapporten diskuterer mulige trusler for de marine naturverdiene i nasjonalparken og foreslår nord/nordøstsiden av Jomfruland som et aktuelt område for å overvåke naturverdienes helsetilstand Fylkesmannen i Telemark
- Published
- 2014
21. ‘Hanging gardens’—comparing fauna communities in kelp farms and wild kelp forests
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Trine Bekkby, Ragnhild Ryther Grimm Torstensen, Lars Andreas Holm Grünfeld, Hege Gundersen, Stein Fredriksen, Eli Rinde, Hartvig Christie, Mats Walday, Guri Sogn Andersen, Marijana S. Brkljacic, Luiza Neves, and Kasper Hancke
- Subjects
kelp farm ,kelp forest ,seaweed ,species composition ,abundance ,diversity ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
A growing need for food is causing increased interest for seaweed farming globally. This requires the knowledge of the industry’s effects on the marine environment. We therefore aimed to explore the communities hosted by a kelp farm compared to that of wild kelp forests. The study was performed in mid-western Norway. Kelp associated fauna were collected from farmed kelp (Saccharina latissima and Alaria esculenta), in wild kelp forests (S. latissima, A. esculenta, and Laminaria hyperborea), and from fauna traps in the water column. The study showed that the kelp farm had lower taxa abundance and richness and a lower biodiversity than the wild kelp forests. Nonetheless, the farmed kelp hosted many associated species, with communities different from what was found on ropes without kelp (i.e., in the water column). The fauna communities among the farmed kelp were more similar to what was found in the wild L. hyperborea kelp forest than to its wild counterparts. The difference between the fauna communities of ‘old’ and ‘young’ farmed kelp (grown for 3 and 7 months, respectively) was not significant, but the fauna was dominated by the isopod species Idotea pelagica in the young forest and by amphipods, mainly belonging to the genus Caprella, in the older. The study contributes to our knowledge of kelp farms’ ecological role in the marine environment, which is of importance for today’s management as well as for ensuring a sustainable future development of the kelp farming industry.
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- 2023
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22. New microsatellite loci for the green sea urchin Strongylocentrotus droebachiensis using universal M13 labelled markers
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Angles d'Auriac, Marc, Hobæk, Anders, Christie, Hartvig C, Gundersen, Hege, Fagerli, Camilla With, Haugstetter, Johannes, and Norderhaug, Kjell Magnus
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Medicine(all) ,Genetic Markers ,Staining and Labeling ,Biochemistry, Genetics and Molecular Biology(all) ,Marine invertebrates ,Molecular Sequence Data ,Short Report ,Strongylocentrotus droebachiensis ,Simple DNA preparation ,Genetic Loci ,Climate change ,Animals ,Heterozygote deficiency ,Kelp forests ,NE Atlantic ,Microsatellites ,DNA Primers ,Microsatellite Repeats ,Strongylocentrotus - Abstract
Background The green sea urchin Strongylocentrotus droebachiensis has a wide circumpolar distribution and plays a key role in coastal ecosystems worldwide by destructively grazing macroalgae beds and turn them into marine deserts, so-called barren grounds. In the past decades, large established kelp forests have been overgrazed and transformed to such barren grounds on the Norwegian coast. This has important repercussions for the coastal diversity and production, including reproduction of several fish species relying on the kelp forests as nurseries. Genetic diversity is an important parameter for the study and further anticipation of this large scale phenomenon. Findings Microsatellites were developed using a Norwegian S. droebachiensis individual primarily for the study of Northeast Atlantic populations. The 10 new microsatellite loci were amplified using M13 forward tails, enabling the use of M13 fluorescent tagged primers for multiplex reading. Among these loci, 2 acted polysomic and should therefore not be considered useful for population genetic analysis. We screened 96 individuals sampled from 4 different sites along the Norwegian coast which have shown unexpected diversity. Conclusions The new microsatellite loci should be a useful resource for further research into connectivity among S. droebachiensis populations, and assessing the risks for spreading and new overgrazing events.
- Published
- 2014
23. Factors affecting the quality and distribution of the kelp Saccharina lattissima in Norway
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Gundersen, Hege, Norderhaug, Kjell Magnus, Christie, Hartvig C, Moy, Frithjof Emil, Hjermann, Dag Øystein, Vedal, Jens, Ledang, Anna Birgitta, Gitmark, Janne Kim, Walday, Mats, and Gundersen, Hege - Project manager
- Subjects
Kyst økosystemer / Coastal ecosystems ,Sukkertare / Saccharina latissima ,Matematikk og naturvitenskap: 400 [VDP] ,Mathematics and natural scienses: 400 [VDP] ,Overvåking / Monitoring ,VDP::Matematikk og naturvitenskap: 400 ,VDP::Mathematics and natural scienses: 400 ,Påvirkningsfaktorer / Impact factors - Abstract
Norsk institutt for vannforskning (NIVA) og Havforskningsinstituttet (HI) har gjennomført prosjektet «Tallknusing av sukkertare-data», på oppdrag fra Miljødirektoratet. Gjennom prosjektet har tilgjengelige data som kan forklare bortfall av sukkertare Saccharina latissima blitt statistisk analysert. Dataserier som er sammenstilt inkluderer datasett fra overvåking (KYS, KYO, ØKOKYST, IO og YO) og forskning (Sukkertareprosjektet og SaccRef) på sukkertare, samt relevante datasett om dens antatte påvirkningsfaktorer (RID, NVE, eKlima, Havforskningsinstituttets hydrografiske målestasjoner, fiskeridata, NAO, samt geofysiske GIS-lag). Analyser viser en generell nedgang i tilstanden av sukkertare på Sør-Vestlandet og Vestlandet, mens Skagerrak i tillegg har opplevd en markant nedgang i indre kystområder med påfølgende oppgang i løpet av 2000-tallet. De viktigste variablene som påvirket sukkertare i denne analysen er flere faktorer som har tilknytning til klimaendringer, tilførsler av næringssalter og partikler og det er sannsynlig at flere faktorer virker sammen. Forekomst av torsk hadde ingen målbar effekt for tilstanden av sukkertare. Selv om forklaringsgraden i analysene var lav var resultatene noenlunde konsistente og gjenspeiler et sett av flere faktorer som kan settes i sammenheng med klimaendringer og næringssalter som de viktigste påvirkningsfaktorene. I rapporten blir det pekt på mulige justeringer i den videre overvåkingen av de store sukkertareforekomstene, og det gis forslag på undersøkelser som kan gjennomføres for å avdekke årsakssammenhenger mellom ulike påvirkningsfaktorer og nedgang i sukkertare i de ulike regionene på Sør- og Vestlandet. Norwegian Institute for Water Research (NIVA) and the Institute of Marine Research (IMR) has implemented this project, commissioned by the Norwegian Environment Agency. Through this project, available data that could explain the loss of sugar kelp Saccharina latissima have been statistically analyzed. Data series compiled includes data from monitoring surveys (KYS, KYO, ØKOKYST, IO and YO) and research (“Sukkertarprosjektet” and “SaccRef”), as well as relevant data-series on impact factors (RID, NVE, eKlima, IMR hydrographic measuring stations, fisheries data, NAO and geophysical GIS layers). This survey was carried out to identify causes of loss of sugar kelp. Analyses of available long-term data show a decline in the condition of sugar kelp in the three areas Skagerrak, the southwestern and the west coast. In Skagerrak there was a marked decrease with subsequent increase during the 2000s. Corresponding data from southwestern and western Norway were not available. The results show that the most important variables that affected sugar in this analysis are several factors that relate to climate change and inputs of nutrients and since analysis has not pointed to a single factor it is likely that several factors work together. Miljødirektoratet
- Published
- 2014
24. Predators of the destructive sea urchin grazer Strongylocentrotus droebachiensis on the Norwegian coast
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Fagerli, Camilla With, Norderhaug, Kjell Magnus, Christie, Hartvig C, Pedersen, Morten Foldager, and Fredriksen, Stein
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predator ,cancer pagurus ,Laminaria hyperborea ,barren ground ,kelp recovery - Abstract
In central Norway, populations of the green sea urchin Strongylocentrotus droe-bachiensis are collapsing, but the factors controlling its population density have not yet been elucidated. Through field sampling, we identified several sea urchin predators and investigated their predation rates on recently settled S. droebachiensis in laboratory experiments. Tethering experiments in kelp forest and on barren ground study sites in the area where sea urchin populations are collapsing confirmed predation by some of the predators tested in laboratory experiments. The edible crab Cancer pagurus was the most efficient sea urchin predator, and it was more abundant at kelp forest sites than on barren grounds. Stocks of C. pagurus have increased dramatically in central Norway since the 1990s, and predation by C. pagurus may contribute to the decline in sea urchin densities, allowing kelp recovery and conferring resilience of the new kelp forest state.
- Published
- 2014
25. Canopy interactions and physical stress gradients in subtidal communities
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Bennett, Scott, primary, Wernberg, Thomas, additional, de Bettignies, Thibaut, additional, Kendrick, Gary A., additional, Anderson, Robert J., additional, Bolton, John J., additional, Rodgers, Kirsten L., additional, Shears, Nick T., additional, Leclerc, Jean-Charles, additional, Lévêque, Laurent, additional, Davoult, Dominique, additional, and Christie, Hartvig C., additional
- Published
- 2015
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26. Sea urchin grazing and kelp re-vegetation in the NE Atlantic
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Norderhaug, Kjell Magnus, primary and Christie, Hartvig C., additional
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- 2009
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27. Variation in Population Structure and Standing Stocks of Kelp Along Multiple Environmental Gradients and Implications for Ecosystem Services
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Hege Gundersen, Eli Rinde, Trine Bekkby, Kasper Hancke, Janne K. Gitmark, and Hartvig Christie
- Subjects
macroalgae ,kelp ,Laminaria hyperborea ,morphological traits ,ecological function ,ecosystem services ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
There is an increasing focus on ecosystem services provided by macroalgae worldwide, many which depend on its structural and morphological characteristics. Here we investigated how characteristics of canopy kelp plants of Laminaria hyperborea varies along the Norwegian part of the NE Atlantic. Ten characteristics related to size, allometry, density, biomass and epiphytes were analyzed along wide gradients of depth, wave exposure and latitude. The analyses were performed on a compiled dataset of 630 scuba samples from different research and monitoring projects along the Norwegian coast (58-71°N). The largest kelps, highest biomass, and highest biomass of epiphytic algae was found in Mid-Norway (63-65°N). While most size-related kelp characteristics were reduced with water depth, they were enlarged with wave exposure. The developed statistical models can be used to calculate site-specific values (and their variation) of the different characteristics at any location based on latitude, depth and wave exposure. These can further be used to map kelp derived ecosystem services. We predicted region-specific estimates of total plant weight, kelp density and kelp biomass. Moreover, the models were applied to estimate living biomass (56 million tonnes fresh weight), carbon standing stock (2.6 million tonnes carbon or 9.5 million tonnes CO2), and carbon sequestration potential (0.46 million tonnes per year) for the Norwegian kelp forests, that were estimated to cover about 5 355 km2. The site- and region-specific estimates are relevant to kelp forest management and for blue carbon accountings.
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- 2021
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28. Financial and Institutional Support Are Important for Large-Scale Kelp Forest Restoration
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Aaron M. Eger, Adriana Vergés, Chang Geun Choi, Hartvig Christie, Melinda A. Coleman, Camilla W. Fagerli, Daisuke Fujita, Masatoshi Hasegawa, Jeong Ha Kim, Mariana Mayer-Pinto, Dan C. Reed, Peter D. Steinberg, and Ezequiel M. Marzinelli
- Subjects
kelp ,restoration ,success ,large scale ,transplants ,coastal management ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Kelps form extensive underwater forests that underpin valuable ecosystem goods and services in temperate and polar rocky coastlines globally. Stressors, such as ocean warming and pollution are causing regional declines of kelp forests and their associated services worldwide. Kelp forest restoration is becoming a prominent management intervention, but we have little understanding of what drives restoration success at appropriate spatial scales. Though most restoration guidelines stress the importance of planning, stressor mitigation and ecological knowledge, other factors, such as lack of resources or institutional support are rarely discussed despite being potentially critical to achieving desired restoration outcomes. In this paper, we work to understand the importance of finances and institutions in the context of four of the world’s largest kelp restoration projects. These projects span four countries, six kelp genera and were initiated in response to different causes of decline. We argue that to restore kelp at desired scales, adequate financing, and institutional support are critical to overcome ecological and environmental limitations. Acknowledging limitations, we outline ways to mobilize resources and encourage institutions to support kelp restoration.
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- 2020
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29. Disappearing Blue Mussels – Can Mesopredators Be Blamed?
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Hartvig Christie, Patrik Kraufvelin, Lucinda Kraufvelin, Niklas Niemi, and Eli Rinde
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blue mussel disappearance ,predation ,mesopredator release ,green crabs ,wrasses ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Despite many theories, the recent evident decreases in blue mussel (Mytilus edulis) abundance in southern Norway and western Sweden (eastern North Sea) have not yet been explained. To test the possible role of increased predation, an ongoing mesocosm experiment exploring general effects of two mesopredators on the structure of littoral macroalgal and macrofaunal communities was used. These mesopredators were the green crab (Carcinus maenas) and the goldsinny wrasse (Ctenolabrus rupestris) which were distributed in a crossed manner to 12 large mesocosms containing diverse rocky shore communities. For the purposes of this study, boulders covered with recently recruited blue mussels and barnacles (Balanus improvisus) from a natural shore were brought in to the mesocosms during two seasons (August and October), and the coverage of the animals (just blue mussels in summer, both mussels and barnacles in autumn) was registered repeatedly over 24 h. The mussels were rapidly consumed by crabs and wrasses, whereas high survival was recorded on boulders in the controls without predators. The barnacles were only eaten by the crabs and not before most of the mussels had been consumed. As both the green crab and the goldsinny wrasse have been reported to increase in abundance, probably related to overfishing of top predators, the resulting higher predation pressure on especially small blue mussels (recruits) may contribute to the mussel decline along these temperate rocky shores.
- Published
- 2020
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30. The Abundance of Kelp Is Modified by the Combined Impact of Depth, Waves and Currents
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Trine Bekkby, Cecilie Smit, Hege Gundersen, Eli Rinde, Henning Steen, Lise Tveiten, Janne K. Gitmark, Stein Fredriksen, Jon Albretsen, and Hartvig Christie
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Laminaria hyperborea ,macroalgae ,water flow ,wave exposure ,current speed ,environmental variables ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
This study analyses the combined impact of two types of ocean water flow, wave exposure and ocean currents, on kelp Laminaria hyperborea abundance, taking other environmental co-variables into account. The dataset covers many ecoregions along the NE Atlantic (Norwegian) coast, including both the Skagerrak, the North Sea and the Norwegian Sea, from 58°N to 66°N. Our results show that the abundance of kelp is modified by the combined impact of depth, waves and currents and that high kelp abundance is found mainly in relatively shallow and flat terrain in wave exposed and low current areas. The analyses reveal significant interactions between wave exposure and both depth and ocean currents, implying depth-specific effects of wave exposure and wave-specific effects of current speed. The somewhat surprising influence of temperature is discussed. The ecological function and ecosystem services of kelp forests are related to kelp abundance. Knowledge on how abundances vary with environmental variables is therefore highly relevant for developing large scale models to quantify and visualize (on maps) macroalgae biomass and ecosystem services, such as wave dampening, carbon storage, and raw material provisioning.
- Published
- 2019
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31. Shifts Between Sugar Kelp and Turf Algae in Norway: Regime Shifts or Fluctuations Between Different Opportunistic Seaweed Species?
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Hartvig Christie, Guri S. Andersen, Trine Bekkby, Camilla W. Fagerli, Janne K. Gitmark, Hege Gundersen, and Eli Rinde
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sugar kelp ,turf algae ,regime shift ,flips back ,opportunistic algae ,eutrophication ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Around year 2000, sugar kelp (Saccharina latissima) forests were observed to disappear in southern parts of Norway, being replaced by mats of turf algae (i.e., filamentous ephemeral algae) loaded with sediments. Among more than 600 stations covering 35 000 km of coastline, about 80% on the Skagerrak coast and about 40% on the North Sea coast were dominated by turf. Various types of turf algae replaced S. latissima in a discontinuous pattern. This large spatial scale event was reported as a possible irrevocable regime shift, not caused by a single factor but related to multiple stressors, where eutrophication and ocean warming were proposed to be the most important. Recent observations have however, revealed that the seabed state has flipped back and forth between sugar kelp and turf algae in several areas and on temporal scales spanning from seasons to years. The relative abundance of S. latissima at monitoring sites at the Norwegian southern coast has fluctuated dramatically during the last 12 years, varying from sparse to common at several of these sites. In 2016, sugar kelp abundance had increased in more than half of the sites, compared to earlier years. Our monitoring data as well as other field observations and field experiments question the regime shift paradigm. Although traditionally considered as a perennial macrophyte, several of our studies indicate that sugar kelp possesses many of the characteristic traits of an opportunistic species, such as high dispersal potential and colonization rate, which enables the species to rapidly colonize available substrate. However, where turf algae persist, space for recolonization of sugar kelp will most likely be minor. In this paper we explore the spatial and temporal shift dynamic between sugar kelp and turf algae based on monitoring data and other studies. Based on a synthesis of mapped fluctuations between the two states, and studies on sugar kelps recolonization abilities, we discuss prerequisites and drivers for an irrevocable regime shift or a continuation of natural fluctuations, as well as possible mitigation actions.
- Published
- 2019
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32. Mechanisms regulating amphipod population density within macroalgal communities with low predator impact
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Hartvig Christie and Patrik Kraufvelin
- Subjects
mesocosm ,macroalgae ,grazers ,gammarus locusta ,population regulation ,eutrophication ,Aquaculture. Fisheries. Angling ,SH1-691 - Abstract
In eight mesocosms (land based basins) macroalgae communities with associated fauna were transplanted from the sea and established during two years. Then, different doses of nutrients (N and P) were added to the basins throughout the following three years. During the period of nutrient addition, macroinvertebrate grazers showed seasonal fluctuations with densities usually between 500,000 and 1 million individuals per mesocosm during summer and to a level of about 100,000 during winter. The macroinvertebrate grazers mainly consisted of about 10 species of amphipods and isopods, among which the amphipod Gammarus locusta dominated strongly by biomass. Although the number of predators was very low, the grazer populations never reached a density where considerable grazing impact could be found on the macroalgae. No increase in grazer density was found in the basins with improved nutrient conditions. Thus food quality may be insufficient for further population growth, or density dependant regulation mechanisms may have prevented the grazers from flourishing and overgrazing the system. In aquarium experiments we showed that G. locusta could grow and reproduce on Fucus serratus, Ulva lactuca, periphyton and detritus, and that cannibalism by adult G. locusta on juveniles may have great impact on the population growth. The basins were run with a water flow through system. Nets were placed in front of the inflow and outflow tubes to measure immigration and emigration. Only few individuals (and no Gammarus sp.) were recorded in the inflowing water, while high numbers of both amphipods and isopods were found in the outflowing water. Emigration reached peak values during night-time, and it was then two to three times as high as during day-time. Emigration of mobile grazers from the basins amounted to 1-2% of the standing stock daily. These mechanisms that regulate grazers do contribute to maintenance of the seaweed dominance and thus the stability of the seaweed community.
- Published
- 2004
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33. The influence of physical factors on kelp and sea urchin distribution in previously and still grazed areas in the NE Atlantic.
- Author
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Eli Rinde, Hartvig Christie, Camilla W Fagerli, Trine Bekkby, Hege Gundersen, Kjell Magnus Norderhaug, and Dag Ø Hjermann
- Subjects
Medicine ,Science - Abstract
The spatial distribution of kelp (Laminaria hyperborea) and sea urchins (Strongylocentrotus droebachiensis) in the NE Atlantic are highly related to physical factors and to temporal changes in temperature. On a large scale, we identified borders for kelp recovery and sea urchin persistence along the north-south gradient. Sea urchin persistence was also related to the coast-ocean gradient. The southern border corresponds to summer temperatures exceeding about 10°C, a threshold value known to be critical for sea urchin recruitment and development. The outer border along the coast-ocean gradient is related to temperature, wave exposure and salinity. On a finer scale, kelp recovery occurs mainly at ridges in outer, wave exposed, saline and warm areas whereas sea urchins still dominate in inner, shallow and cold areas, particularly in areas with optimal current speed for sea urchin foraging. In contrast to other studies in Europe, we here show a positive influence of climate change to presence of a long-lived climax canopy-forming kelp. The extent of the coast-ocean gradient varies within the study area, and is especially wide in the southern part where the presence of islands and skerries increases the area of the shallow coastal zone. This creates a large area with intermediate physical conditions for the two species and a mosaic of kelp and sea urchin dominated patches. The statistical models (GAM and BRT) show high performance and indicate recovery of kelp in 45-60% of the study area. The study shows the value of combining a traditional (GAM) and a more complex (BRT) modeling approach to gain insight into complex spatial patterns of species or habitats. The results, methods and approaches are of general ecological relevance regardless of ecosystems and species, although they are particularly relevant for understanding and exploring the corresponding changes between algae and grazers in different coastal areas.
- Published
- 2014
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34. Seasonal Patterns of Sporophyte Growth, Fertility, Fouling, and Mortality of Saccharina latissima in Skagerrak, Norway: Implications for Forest Recovery
- Author
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Guri Sogn Andersen, Henning Steen, Hartvig Christie, Stein Fredriksen, and Frithjof Emil Moy
- Subjects
Oceanography ,GC1-1581 ,Biology (General) ,QH301-705.5 - Abstract
On the Skagerrak coast the kelp Saccharina latissima has suffered severe stand reductions over the last decade, resulting in loss of important habitats. In the present study, healthy kelp plants were transplanted into four deforested areas and their patterns of growth, reproduction, and survival were monitored through subsequent seasons. Our main objective was to establish whether the kelp plants were able to grow and mature in deforested areas. We observed normal patterns of growth and maturation at all study sites. However, heavy fouling by epiphytes occurred each summer, followed by high kelp mortality. The study shows that the seasonal variations and the life stage timing of S. latissima make formation of self-sustainable populations impossible in the present environment. Most noteworthy, we suggest that fouling by epiphytes is involved in the lack of kelp forest recovery in Skagerrak, Norway.
- Published
- 2011
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35. Hva bestemmer egenskaper og økologisk funksjon i ålegrasenger?
- Author
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Christie, Hartvig, Rinde, Eli, Moy, Frithjof Emil, Bekkby, Trine, and Christie, Hartvig C - Project manager
- Subjects
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 ,VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 - Abstract
Juni 2014 ble 27 ålegrasenger i Aust-Agder undersøkt for å analysere hvilke miljøfaktorer som bestemmer egenskaper som tetthet og høyde til ålegrasplanten i engene, og om enger med tett ålegrasvegetasjon er leveområde for et annet dyresamfunn enn glisne enger. Tett ålegrasvegetasjon er hovedsakelig knyttet til områder grunnere enn 5 m dyp.; ålegrasets høyde øker med økt bølgepåvirkning og med økt helningsgrad av terrenget.; de største engene med hensyn til areal var i områder med relativt lite bølgepåvirkning. På tross av disse generelle påvirkningene av miljøfaktorene dyp, skråning og bølgepåvirkning var det en del tilfeldig variasjon knyttet til de ulike engenes egenskaper. Ved å sammenlikne tre enger med tett ålegrasvegetasjon med tre enger med spredt ålegrasvegetasjon fant vi også stor variasjon i forekomst og sammensetning av assosierte arter av smådyr og fisk. Det var store likheter mellom prøvene innenfor hver eng, mens forskjellene i tetthet av dyr var store fra eng til eng. Undersøkelsen viser at ålegrasenger har en viktig økologisk funksjon uavhengig av om de har høy eller lav ålegrasbiomasse og enten plantene er høye eller lave. Det er derfor viktig å ivareta enger med både høy og lav ålegrastetthet for å ivareta biologisk mangfold, forekomst av smådyr og næringsområder for fisk. Store ålegrasenger, enten de har høy eller lav ålegrastetthet, vil ha større økologisk betydning enn små gjennom økt habitatstørrelse, høyere total primærproduksjon og totalt større mengde assosiert flora og fauna. Miljødirektoratet
- Published
- 2014
36. A useful tool to assess quality of LIFE in rheumatoid arthritis patients that does not require a license: QOL-RA II.
- Author
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Isnardi CA, Schneeberger EE, Capelusnik D, de Los Ángeles Correa M, Lim R, Hu M, Tapia MJ, Kerzberg E, Blanco E, Benavidez FL, Gonzales Lucero L, Barbaglia AL, Bazzarelli M, Ficco HM, Pérez S, Hartvig C, Salcedo M, and Citera G
- Subjects
- Adolescent, Cross-Sectional Studies, Humans, Reproducibility of Results, Surveys and Questionnaires, Arthritis, Rheumatoid, Quality of Life
- Abstract
To validate the Quality of Life-Rheumatoid Arthritis Scale II (QOL-RA II) in an Argentinean cohort of patients with rheumatoid arthritis (RA). Patients ≥ 18 years old, with a diagnosis of RA according to ACR-EULAR 2010 criteria, were included in a cross-sectional study. Sociodemographic data, comorbidities, RA characteristics, disease activity, and current treatment were registered. Questionnaires were administered, including EQ-5D-3 L, QOL-RA II, HAQ-A, and PHQ-9. The QOL-RA II was re-administered in 20 patients to evaluate reproducibility. Four hundred and thirty patients were included. Median QOL-RA was 6.6 (IQR 5.3-8). Mean time to complete it was 1.7 ± 0.57 min and to calculate it was 12 ± 1.7 s. It showed very good reliability (Cronbach's alpha 0.97), reproducibility (ICC, 0.96), and good correlation between the different items and the total questionnaire, without evidence of redundancy. Besides, QOL-RA II presented good correlation with EQ-5D-3L (Rho, 0.6) and moderate with DAS28 (Rho, 0.38), and CDAI (Rho, 0.46). Worse quality of life was observed in patients not doing physical activity, unemployed, and current smokers. Patients with higher disease activity had a significant poorer quality of life. Adjusting by age, sex and disease duration, unemployment, higher disease activity, disability, and the presence of depression were independently associated to worse quality of life. QOL-RA II demonstrated good construct validity, reproducibility, and reliability. It was easy to complete and calculate and does not require a license for its use, thus making it the optimal tool for assessing the quality of life in Spanish-speaking patients with RA. Key Points • The evaluation of quality of life is very important in patients with Rheumatoid Arthritis. • Most of the questionnaires used to assess the quality of life require a license to use. • QOL-RA II is a valid and simple questionnaire to evaluate the quality of life of patients with RA and does not require a license for its use.
- Published
- 2020
- Full Text
- View/download PDF
37. Evaluation of the Educational Needs in Argentine Patients with Rheumatoid Arthritis Using the SpENAT Questionnaire.
- Author
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Pérez S, Santa Cruz M, Sosa J, Kohan P, Medina M, Klajn D, Papasidero S, Caracciolo J, Pendón G, Giordano F, Pereira D, Alvarez D, Astudillo V, Kerzberg E, Perez Dávila A, Bohr A, Melo F, Lloves N, Mamani M, Hartvig C, Sanchez G, Sacnum M, Chichotky Y, Velazco Zamora J, Benegas M, Rosa J, García M, Raiti L, Cruzat V, Quintana R, Pons-Estel B, Kirmayr K, D'Orazio A, Retamozo C, Romano O, Perez Alamino R, Correa M, Citera G, Rillo O, Zalazar M, Costi A, García M, Gomez G, and Maldonado Ficco H
- Subjects
- Argentina, Cross-Sectional Studies, Female, Humans, Male, Middle Aged, Arthritis, Rheumatoid, Health Knowledge, Attitudes, Practice, Needs Assessment, Self Report
- Abstract
Background: The SpENAT, a Spanish version of the Educational Needs Assessment Tool, is a self-completed questionnaire that assesses educational needs (ENs) with the purpose of providing tailored and patient-centered information. It consists of 39 questions grouped into the 7 following domains: Pain management, Movement, Feelings, Arthritic process, Treatments, Self-help measures and Support system., Objectives: The objective of the study was to describe the ENs of rheumatoid arthritis (RA) patients using the SpENAT and to determine the main sources of information consulted by these patients., Material and Methods: Multicenter, observational, cross-sectional study. We included consecutive patients≥18 years with diagnosis of RA (ACR 87/ACR-EULAR 2010). Sociodemographic data, disease characteristics and clinimetric properties were recorded. All patients completed the SpENAT and were asked about the sources employed to obtain information about their disease., Statistical Analysis: Population characteristics were described. ENs were determined as percentages of the highest possible score for each domain. Needs for each domain according to sex, years of education, disease duration, use of biologicals and functional capacity were analyzed by means of ANOVA, and bivariate comparisons were made with Student's t-test and the Bonferroni correction. Correlation between domains was determined with the Spearman correlation coefficient. We compared patients' age by source of information with Student's t-test., Results: We included 496 patients from 20 centers across the country. More ENs were observed in the domains of Movement, Feelings and the Arthritic process. Patients with higher educational level (>7 years) reported more ENs in the Arthritic process and Self-help measure domains. A higher functional impairment (HAQ-A≥0.87) was associated with more ENs in every domain. Patients with high activity showed more ENs than those in remission in the domains of Pain management, Movement, Feelings, Treatments and Support system, as well as those with low activity in Self-help measures and Support system domains. All SpENAT domains showed positive correlations among each other (P<.0001), the most important being Pain management/Movement and Treatments/Arthritic process (r≥0.7). The source of information most frequently consulted was the rheumatologist (93.95%); those who made use of Internet were on average younger (P=.0004)., Conclusion: RA patients were very interested about knowing more about their disease. High functional impairment was associated with more ENs. Patients with high disease activity had higher EN levels in almost every domain. The rheumatologist was the main source of information for the patient with RA., (Copyright © 2018 Elsevier España, S.L.U. and Sociedad Española de Reumatología y Colegio Mexicano de Reumatología. All rights reserved.)
- Published
- 2020
- Full Text
- View/download PDF
38. [Nutrition therapy in 542 hospitalized patients].
- Author
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Kondrup J, Beck AM, Hansen BS, Hartvig C, Ipsen B, Ronneby H, and Stilling B
- Subjects
- Adult, Denmark, Energy Intake, Energy Metabolism, Female, Humans, Male, Middle Aged, Nutrition Disorders drug therapy, Parenteral Nutrition, Prospective Studies, Weight Gain, Hospitalization, Nutrition Disorders diet therapy, Nutritional Support
- Abstract
The purpose of the study was to evaluate the feasibility of nutritional therapy in a university hospital. Over a four-year period, 542 adult patients from 16 different departments were included in the study due to malnutrition and/or severe disease. Energy requirement including a surplus for weight gain was calculated by the factorial method and feeding was undertaken by means of food, liquid supplements, tube feeding or parenteral nutrition for an average period of 4.8 weeks. In patients with benign disease only, the average weight gain was as expected from energy balance but in patients with a benign stress-catabolic disease weight gain was only 40% of that expected. In malnourished patients with malignant disease, radiation- or chemotherapy could be carried out without further loss of body weight. During bone-marrow transplantation only a minor weight loss occurred. In conclusion, nutritional therapy is feasible in a clinical setting and the methods employed can identify groups of patients that require only nutritional support and other groups of patients that in addition require treatment of a stress-catabolic state.
- Published
- 1996
39. [Malnutrition in hospitals--action possibilities].
- Author
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Bentzen-Bilkvist B and Hartvig C
- Subjects
- Food Service, Hospital, Humans, Deficiency Diseases prevention & control, Nutrition Disorders prevention & control
- Published
- 1989
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