Search

Your search keyword '"Sohar, Kadri"' showing total 21 results
Start Over Author "Sohar, Kadri"
21 results on '"Sohar, Kadri"'

1. Development of the late glacial Baltic basin and the succession of vegetation cover as revealed at Palaeolake Haljala, northern Estonia

Author

Saarse, Leili, Niinemets, Eve, Amon, Leeli, Heinsalu, Atko, Veski, Siim, and Sohar, Kadri

Subjects
late glacial, pollen, plant macrofossils, LOI, 14C dates, ostracods, North Estonia, Geology, QE1-996.5
Abstract

The 4.5 m thick Haljala sequence in North Estonia was studied to provide information on palaeoenvironmental changes between 13 800 and 11 300 cal yr BP. Late glacial environmental history of North Estonia was reconstructed using AMS-dated pollen record, sediment composition, plant macrofossils, and ostracods. The obtained data show environmental fluctuations that are linked to the climate shifts of the Last Termination in the North Atlantic region. Decrease in the arboreal pollen accumulation rate around 13 700–13 600 and 13 300–13 100 cal yr BP refers to short deterioration of climate within the Allerød Interstadial and has been correlated with the cooling of the Greenland Interstadial GI-1c and GI-1b events, respectively. Between 13 100 and 12 850 cal yr BP the pollen accumulation rate of trees, shrubs, and herb as well as organic matter increased, indicating short-term climate amelioration and establishment of pine-birch woods. This change has been correlated with the GI-1a event. Climate deterioration during the Younger Dryas (GS-1) was inferred from the reduction of tree pollen and flourishing of cold-tolerant species, such as Artemisia, Chenopodiaceae, and Cyperaceae. New data show that ice cover of the Pandivere Upland started to perish already about 13 800 cal yr BP.

Published
2009

2. Mid-Late Quaternary Fluvial Archives near the Margin of the MIS 12 Glaciation in Southern East Anglia, UK: Amalgamation of Multi-Disciplinary and Citizen-Science Data Sources

Author

Allen, Peter, primary, Bain, David, additional, Bridgland, David, additional, Buisson, Paul, additional, Buylaert, Jan-Pieter, additional, Bynoe, Rachel, additional, George, William, additional, Haggart, B., additional, Horne, David, additional, Littlewood, Ellen-May, additional, Lord, Alan, additional, March, Anna, additional, Mercer, Ian, additional, Mercer, Rosalind, additional, Murray, Andrew, additional, Penkman, Kirsty, additional, Preece, Richard, additional, Ratford, John, additional, Schreve, Danielle, additional, Snelling, Andrew, additional, Sohar, Kadri, additional, Whittaker, John, additional, White, Mark, additional, and White, Tom, additional

Published
2022
Full Text
View/download PDF

3. Looking forward through the past: identification of 50 priority research questions in palaeoecology

Author

Seddon, Alistair W. R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne J., Juggins, Stephen, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogués-Bravo, David, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, William E. N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Ramsey, Christopher Bronk, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H. G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Mariusz, Larocque-Tobler, Isabelle, López-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya, Encarni, Morton, Oliver, Nogué, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez-Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., and Witkowski, Andrzej

Published
2014

4. Mid-Late Quaternary Fluvial Archives near the Margin of the MIS 12 Glaciation in Southern East Anglia, UK:Amalgamation of Multi-Disciplinary and Citizen-Science Data Sources

Author

Allen, Peter, Bain, David R., Bridgland, David R., Buisson, Paul, Buylaert, Jan Pieter, Bynoe, Rachel, George, William H., Haggart, B. Andrew, Horne, David J., Littlewood, Ellen May, Lord, Alan R., March, Anna C., Mercer, Ian, Mercer, Rosalind, Murray, Andrew S., Penkman, Kirsty E.H., Preece, Richard C., Ratford, John, Schreve, Danielle C., Snelling, Andrew J.R., Sohar, Kadri, Whittaker, John, White, Mark J., White, Tom S., Allen, Peter, Bain, David R., Bridgland, David R., Buisson, Paul, Buylaert, Jan Pieter, Bynoe, Rachel, George, William H., Haggart, B. Andrew, Horne, David J., Littlewood, Ellen May, Lord, Alan R., March, Anna C., Mercer, Ian, Mercer, Rosalind, Murray, Andrew S., Penkman, Kirsty E.H., Preece, Richard C., Ratford, John, Schreve, Danielle C., Snelling, Andrew J.R., Sohar, Kadri, Whittaker, John, White, Mark J., and White, Tom S.

Abstract

This paper presents an updated geological reconstruction of the Quaternary evolution of the River Thames at its downstream extremities, close to the North Sea coast, based on new data from multi-disciplinary and citizen-science sources. In this area, the interaction of the Thames with the MIS 12 (Anglian) glaciation is an important part of the Quaternary archive. The Anglian ice sheet, which reached parts of north and east London, was responsible for diverting the Thames southwards into its present course, although the footprint of the maximum ice sheet(s) does not reach the North Sea coast south of Hollesley, Suffolk. Further south, the coastal zone hosts pre-Anglian and early Anglian river-terrace deposits of the pre-diversion Thames system, superimposed upon which are products of later post-Anglian rivers, of both Middle and Late Pleistocene age. On the peninsula between the Stour and Blackwater–Colne estuaries, the lowest and most recent terrace of the pre-diversion Thames includes evidence directly pertaining to the glacial disruption event, for which geochronological data are reported here for the first time. The first post-diversion terrace of the Thames also reaches this peninsula, the river having essentially re-joined its original valley before crossing the alignment of the modern coastline. This terrace passes beneath Clacton-on-Sea, where it includes the type locality of the Clactonian Palaeolithic Industry. The area of interest to this paper, in NE Essex and southern Suffolk, includes a number of interglacial and Palaeolithic sites, the data from which assist in constraining the chronostratigraphy of the sequence. In some cases, there has been uncertainty as to whether these sites represent pre-Anglian environments and hominin occupations, part of the palaeo-Thames sequence, or whether they are the product of later post-Anglian streams, formed after the Thames had migrated southwards. This paper compiles evidence from a wide range of recent sources

Published
2022

7. Holocene relative shore level changes and Stone Age hunter-gatherers in Hiiumaa Island, eastern Baltic Sea

Author

Rosentau, Alar, Nirgi, Triine, Muru, Merle, Bjursäter, Stefan, Hang, Tiit, Preusser, Frank, Risberg, Jan, Sohar, Kadri, Tonisson, Hannes, Kriiska, Aivar, Rosentau, Alar, Nirgi, Triine, Muru, Merle, Bjursäter, Stefan, Hang, Tiit, Preusser, Frank, Risberg, Jan, Sohar, Kadri, Tonisson, Hannes, and Kriiska, Aivar

Abstract

Holocene relative shore level (RSL) changes and Stone Age palaeogeography of Hiiumaa Island are reconstructed using airborne LiDARelevation data, sedimentological and archaeological proxies as well asGIS-based landscape modelling. Altogether, 38RSLindex and limiting points are used in modelling and presented in the current paper. The highest raised shorelines of the Ancylus Lake and Litorina Sea, mapped at the elevations of 47 and 26 m a.s.l., formed around 10.3 and 7.4 cal. kaBP, respectively. The reconstructedRSLcurve reveals a 20-m drainage of Ancylus Lake followed by a land-uplift-driven 3-m regression during the Initial Litorina Sea period.RSLrise during the Litorina Sea transgression remained below 4 m and its maximum was reached later than proposed previously, discarding therefore the idea of highly diachronous Litorina culmination in the eastern Baltic Sea. During the period 7.4-6.0 cal. kaBP,RSLfall was about 4.3 mm a(-1), and afterwards in average at about 1 mm(-1)less suggesting deceleration in isostatic rebound. suggesting deceleration in isostatic rebound. Palaeogeographical reconstructions show that during its earliest occupation at about 7.6 cal. kaBPless than 1% of the terrain of Hiiumaa was above the sea level and that wind-protectedSEexposed shores were the most preferred campsite locations of Late Mesolithic and Neolithic settlers. These campsites are located successively at lower elevations following the shoreline retreat and show repeated use of this coastal area between 7.6 and 4.6 cal. kaBP. Due to the spread of the Corded Ware culture around 4.8-4.0 cal. kaBPthe settlements of Hiiumaa Island and many other coastal areas of the eastern Baltic moved from the coast to more suitable places for agriculture and animal husbandry.

Published
2020
Full Text
View/download PDF

9. Mageveelised karpvähid pärastjääaegsetes setetes ja nende kasutamine paleokeskkonna rekonstrueerimisel Eestis

Author

Sohar, Kadri

Subjects
paleokeskkond, dissertation, kliimamuutused, väitekiri, dissertatsioonid, karpvähid, ETD, geoloogia, mageveekogud
Abstract

Väitekirja elektrooniline versioon ei sisalda publikatsioone., Paleokeskkonna uuringud on muutunud oluliseks kogu maailmas. Selleks, et näha ette võimalikke tuleviku arengusuundi, püütakse mõista minevikus toimunud kliimamuutusi. Antud töös kasutatakse esmakordselt Eestis karpvähkide subfossiile, interpreteerimaks keskkonna¬muutusi peale viimast jääaega. Karpvähid (u 0,5–2 mm) on veelised organis¬mid, kelle kahepoolmeline lubiainest koda säilib setetes pärast looma surma. Teades tänapäevaste karpvähkide keskkonna¬eelistusi on võimalik interpreteerida mineviku veelist keskkonda. Peale liustiku taandumist asustasid karpvähid kiiresti suured pärastjääaegsed mageveekogud. Karpvähkide koosluste struktuur sõltus temperatuurist ning ilmusid soojenemisele viitavad liigid (13800–13600 aastat tagasi). Järgnes kliima jahenemine u 13600–13000 a.t. ning karpvähiliste seas levisid külmalembesed liigid, näiteks Cytherissa lacustris ja Limnocytherina sanctipatricii. Erinevates uuritud läbilõigetes võib täheldada karpvähkide koosluste muutusi, mis viitavad veekogude vananemisele. Ilmneb teatud indikaatorliikide reeglipärane levik, nt madala toitelisusega hapnikurikkas jahedas ning sügavas järves oli levinud Candona candida, kuid avaveelisele madaldunud veekogule oli iseloomulik Darwinula stevensoni ning rohketoitelises soojas taimestikurikkas kaldavööndis domineeris Metacypris cordata. Poolmaismaalise eluviisiga Scottia pseudobrowniana esinemine järvesetete noorimates kihtides viitab kinni¬kasvamisjärgus järvenõole. Veekogude vananemine oli seotud veetaseme langusega, temperatuuri tõusuga ning toitelisuse kasvuga Holotseeni esimesel poolel. Ehkki selline arengu¬mudel on järvedele tüüpiline, ei ole muutused järvedes ega ostrakoodikooslustes leidnud aset samaaegselt. Järvede arengut mõjutasid lisaks temperatuurimuutustele ka sademete ja aurumise vahekord ning toitelisuse muutused. Karpvähkide kasutamine paleoklimaatilistes rekonstruktsioonides väärib edaspidi süvendatud tähelepanu, kuna nende kodade geokeemiline analüüsimine (isotoopkoostis) annab ainulaadset informatsiooni temperatuurikõikumiste kohta pärast jääaega., The thesis focuses on analysis of Quaternary freshwater ostracod (benthic crustaceans, 0.5-2 mm in size) subfossils and autecology of indicator species in order to reconstruct lacustrine palaeoenvironments after the last glaciation in Estonia. The composition of the ostracod fauna reflects changes in the water level, temperature, trophic status and vegetation cover of the lake. Pioneer species colonized large lake margin areas already at ca. 13.8–13.6 kyr BP following a temperature increase after ice decay. Temperature decrease at ca. 13.6–13.1 kyr BP favoured species which inhabit cold, oligotrophic, well-ventilated bottom waters in deep and large lakes (Limnocytherina sanctipatricii, Cytherissa lacustris). The succession of ostracod assemblages show a general evolution of lake environments: the “candida-fauna” represents phase of large oligotrophic lakes; the succeeding “stevensoni-fauna” indicates shallower mesotrophic open lakes; and the “cordata-fauna” refers to a shallow, aged, eutrophic water body with dense, emerged vegetation. The predominance of Metacypris cordata suggests an increasing temperature and higher productivity ca. 12.8-7.4 kyr BP. Finally, appearance of Scottia pseudobrowniana suggests paludification of lake margins. In the lakes studied changes in ostracod assemblages reveal like palaeo¬ecological signals. However, the environmental shifts were not contemporaneous, suggesting that the influence of local catchment features, such as water level, groundwater inflow, vegetation cover and nutrient input, was stronger than that of regional climatic conditions.

Published
2010

10. Looking forward through the past: identification of 50 priority research questions in palaeoecology

Author

Seddon, Alistair W.R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne, Juggins, Steve, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogués-Bravo, David, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, W.E.N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Bronk Ramsey, Christopher, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H.G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Marisuz, Larocque-Tobler, Isabelle, López-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya, Encarni, Morton, Oliver, Nogué, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez- Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., Witkowski, Andrzej, Seddon, Alistair W.R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne, Juggins, Steve, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogués-Bravo, David, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, W.E.N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Bronk Ramsey, Christopher, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H.G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Marisuz, Larocque-Tobler, Isabelle, López-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya, Encarni, Morton, Oliver, Nogué, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez- Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., and Witkowski, Andrzej

Abstract

1. Priority question exercises are becoming an increasingly common tool to frame future agendas in conservation and ecological science. They are an effective way to identify resear ch foci that advance the field and that also have high policy and conservation relevance. 2. To date, there has been no coherent synthesis of key questions and priority research areas for pal- aeoecology, which combines biological, geochemical and molecular techniques in order to recon- struct past ecological and environmental systems on time-scales from decades to millions of years. 3. We adapted a well-established methodology to identify 50 priority research questions in palaeoe- cology. Using a set of criteria designed to identify realistic and achievable research goals, we selected questions from a pool submitted by the international palaeoecology research community and relevant policy practitioners. 4. The integration of online participation, both before and during the workshop, increased interna- tional engagement in question selection. 5. The questions selected are structured around six themes: human–environment interactions in the Anthropocene; biodiversity, conservation and novel ecosystems; biodiversity over long time-scales; ecosystem processes and biogeochemical cycling; comparing, combining and synthesizing informa- tion from multiple records; and new developments in palaeo ecology. 6. Future opportunities in palaeoecology are related to improved incorporation of uncertainty into reconstructions, an enhanced understanding of ecological and evolutionary dynamics and processes and the continued application of long-term data for better-informed landscape management. 7. Synthesis. Palaeoecology is a vibrant and thriving discipline, and these 50 priority questions high- light its potential for addressing both pure (e.g. ecological and evolutionary, methodological) and applied (e.g. environmental and conservation) issues related to ecological science and global change

Published
2014

11. Looking forward through the past:identification of 50 priority research questions in palaeoecology

Author

Seddon, Alistair W. R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne J., Juggins, Stephen, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogues, David Bravo, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, William E. N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Ramsey, Christopher Bronk, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H. G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Mariusz, Larocque-Tobler, Isabelle, Lopez-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya, Encarni, Morton, Oliver, Nogue, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez-Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., Witkowski, Andrzej, Seddon, Alistair W. R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne J., Juggins, Stephen, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogues, David Bravo, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, William E. N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Ramsey, Christopher Bronk, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H. G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Mariusz, Larocque-Tobler, Isabelle, Lopez-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya, Encarni, Morton, Oliver, Nogue, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez-Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., and Witkowski, Andrzej

Published
2014

13. Looking forward through the past: identification of 50 priority research questions in palaeoecology

Author

Seddon, Alistair W. R., primary, Mackay, Anson W., additional, Baker, Ambroise G., additional, Birks, H. John B., additional, Breman, Elinor, additional, Buck, Caitlin E., additional, Ellis, Erle C., additional, Froyd, Cynthia A., additional, Gill, Jacquelyn L., additional, Gillson, Lindsey, additional, Johnson, Edward A., additional, Jones, Vivienne J., additional, Juggins, Stephen, additional, Macias‐Fauria, Marc, additional, Mills, Keely, additional, Morris, Jesse L., additional, Nogués‐Bravo, David, additional, Punyasena, Surangi W., additional, Roland, Thomas P., additional, Tanentzap, Andrew J., additional, Willis, Kathy J., additional, Aberhan, Martin, additional, van Asperen, Eline N., additional, Austin, William E. N., additional, Battarbee, Rick W., additional, Bhagwat, Shonil, additional, Belanger, Christina L., additional, Bennett, Keith D., additional, Birks, Hilary H., additional, Bronk Ramsey, Christopher, additional, Brooks, Stephen J., additional, de Bruyn, Mark, additional, Butler, Paul G., additional, Chambers, Frank M., additional, Clarke, Stewart J., additional, Davies, Althea L., additional, Dearing, John A., additional, Ezard, Thomas H. G., additional, Feurdean, Angelica, additional, Flower, Roger J., additional, Gell, Peter, additional, Hausmann, Sonja, additional, Hogan, Erika J., additional, Hopkins, Melanie J., additional, Jeffers, Elizabeth S., additional, Korhola, Atte A., additional, Marchant, Robert, additional, Kiefer, Thorsten, additional, Lamentowicz, Mariusz, additional, Larocque‐Tobler, Isabelle, additional, López‐Merino, Lourdes, additional, Liow, Lee H., additional, McGowan, Suzanne, additional, Miller, Joshua H., additional, Montoya, Encarni, additional, Morton, Oliver, additional, Nogué, Sandra, additional, Onoufriou, Chloe, additional, Boush, Lisa P., additional, Rodriguez‐Sanchez, Francisco, additional, Rose, Neil L., additional, Sayer, Carl D., additional, Shaw, Helen E., additional, Payne, Richard, additional, Simpson, Gavin, additional, Sohar, Kadri, additional, Whitehouse, Nicki J., additional, Williams, John W., additional, and Witkowski, Andrzej, additional

Published
2013
Full Text
View/download PDF

16. Meiobenthos of some Estonian coastal lakes

Author

Timm, Tarmo, Kumari, Margit, Kübar, Kaidi, Sohar, Kadri, and Traunspurger, Walter

Abstract

Abstract.Corer samples of zoobenthos were collected in 20 coastal water bodies of western Estonia including 2 inner parts of bays of the Baltic Sea, 5 lagoons weakly connected with the sea, and 13 freshwater lakes in August 2004. Reigi laht, an open bay, was the only site where brackish-water taxa dominated; in the same bay, eumeiobenthic small Nematoda were very abundant. At all other sites, the bulk of meiobenthos was formed of small, pseudomeiobenthic individuals of Chironomidae and Oligochaeta, while eumeiobenthos, consisting here mainly of Nematoda and Ostracoda, was outnumbered by the former. The near-bottom planktic Cladocera and Copepoda were also common. Freshwater taxa dominated in all lagoons and lakes, with scarce brackish-water species accompanying them in the lagoons as well as in some lakes. The abundance and biomass of pseudo- and eumeiobenthos, as well as of planktic crustaceans, were higher in the lagoons than in the freshwater lakes.

Published
2007

17. Looking forward through the past: identification of 50 priority research questions in palaeoecology

Author

Seddon, Alistair W. R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne J., Juggins, Stephen, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogués-Bravo, David, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, William E. N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Bronk Ramsey, Christopher, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H. G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Mariusz, Larocque-Tobler, Isabelle, López-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya Romo, Encarnacion, Morton, Oliver, Nogué, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez-Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., Witkowski, Andrzej, McGlone, Matt, Seddon, Alistair W. R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne J., Juggins, Stephen, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogués-Bravo, David, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, William E. N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Bronk Ramsey, Christopher, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H. G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Mariusz, Larocque-Tobler, Isabelle, López-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya Romo, Encarnacion, Morton, Oliver, Nogué, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez-Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., Witkowski, Andrzej, and McGlone, Matt

Abstract

1. Priority question exercises are becoming an increasingly common tool to frame future agendas in conservation and ecological science. They are an effective way to identify research foci that advance the field and that also have high policy and conservation relevance. 2. To date, there has been no coherent synthesis of key questions and priority research areas for palaeoecology, which combines biological, geochemical and molecular techniques in order to reconstruct past ecological and environmental systems on time-scales from decades to millions of years. 3. We adapted a well-established methodology to identify 50 priority research questions in palaeoecology. Using a set of criteria designed to identify realistic and achievable research goals, we selected questions from a pool submitted by the international palaeoecology research community and relevant policy practitioners. 4. The integration of online participation, both before and during the workshop, increased international engagement in question selection. 5. The questions selected are structured around six themes: human–environment interactions in the Anthropocene; biodiversity, conservation and novel ecosystems; biodiversity over long time-scales; ecosystem processes and biogeochemical cycling; comparing, combining and synthesizing information from multiple records; and new developments in palaeoecology. 6. Future opportunities in palaeoecology are related to improved incorporation of uncertainty into reconstructions, an enhanced understanding of ecological and evolutionary dynamics and processes and the continued application of long-term data for better-informed landscape management. 7. Synthesis. Palaeoecology is a vibrant and thriving discipline, and these 50 priority questions highlight its potential for addressing both pure (e.g. ecological and evolutionary, methodological) and applied (e.g. environmental and conservation) issues related to ecological science and global change.

18. Looking forward through the past: identification of 50 priority research questions in palaeoecology

Author

Seddon, Alistair W. R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne J., Juggins, Stephen, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogués-Bravo, David, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, William E. N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Bronk Ramsey, Christopher, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H. G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Mariusz, Larocque-Tobler, Isabelle, López-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya Romo, Encarnacion, Morton, Oliver, Nogué, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez-Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., Witkowski, Andrzej, McGlone, Matt, Seddon, Alistair W. R., Mackay, Anson W., Baker, Ambroise G., Birks, H. John B., Breman, Elinor, Buck, Caitlin E., Ellis, Erle C., Froyd, Cynthia A., Gill, Jacquelyn L., Gillson, Lindsey, Johnson, Edward A., Jones, Vivienne J., Juggins, Stephen, Macias-Fauria, Marc, Mills, Keely, Morris, Jesse L., Nogués-Bravo, David, Punyasena, Surangi W., Roland, Thomas P., Tanentzap, Andrew J., Willis, Kathy J., Aberhan, Martin, van Asperen, Eline N., Austin, William E. N., Battarbee, Rick W., Bhagwat, Shonil, Belanger, Christina L., Bennett, Keith D., Birks, Hilary H., Bronk Ramsey, Christopher, Brooks, Stephen J., de Bruyn, Mark, Butler, Paul G., Chambers, Frank M., Clarke, Stewart J., Davies, Althea L., Dearing, John A., Ezard, Thomas H. G., Feurdean, Angelica, Flower, Roger J., Gell, Peter, Hausmann, Sonja, Hogan, Erika J., Hopkins, Melanie J., Jeffers, Elizabeth S., Korhola, Atte A., Marchant, Robert, Kiefer, Thorsten, Lamentowicz, Mariusz, Larocque-Tobler, Isabelle, López-Merino, Lourdes, Liow, Lee H., McGowan, Suzanne, Miller, Joshua H., Montoya Romo, Encarnacion, Morton, Oliver, Nogué, Sandra, Onoufriou, Chloe, Boush, Lisa P., Rodriguez-Sanchez, Francisco, Rose, Neil L., Sayer, Carl D., Shaw, Helen E., Payne, Richard, Simpson, Gavin, Sohar, Kadri, Whitehouse, Nicki J., Williams, John W., Witkowski, Andrzej, and McGlone, Matt

Abstract

1. Priority question exercises are becoming an increasingly common tool to frame future agendas in conservation and ecological science. They are an effective way to identify research foci that advance the field and that also have high policy and conservation relevance. 2. To date, there has been no coherent synthesis of key questions and priority research areas for palaeoecology, which combines biological, geochemical and molecular techniques in order to reconstruct past ecological and environmental systems on time-scales from decades to millions of years. 3. We adapted a well-established methodology to identify 50 priority research questions in palaeoecology. Using a set of criteria designed to identify realistic and achievable research goals, we selected questions from a pool submitted by the international palaeoecology research community and relevant policy practitioners. 4. The integration of online participation, both before and during the workshop, increased international engagement in question selection. 5. The questions selected are structured around six themes: human–environment interactions in the Anthropocene; biodiversity, conservation and novel ecosystems; biodiversity over long time-scales; ecosystem processes and biogeochemical cycling; comparing, combining and synthesizing information from multiple records; and new developments in palaeoecology. 6. Future opportunities in palaeoecology are related to improved incorporation of uncertainty into reconstructions, an enhanced understanding of ecological and evolutionary dynamics and processes and the continued application of long-term data for better-informed landscape management. 7. Synthesis. Palaeoecology is a vibrant and thriving discipline, and these 50 priority questions highlight its potential for addressing both pure (e.g. ecological and evolutionary, methodological) and applied (e.g. environmental and conservation) issues related to ecological science and global change.

Full Text
View/download PDF

21. Leduslaikmeta beigu posma un holocēna vides izmaiņu atspoguļojums Dreimaņu ezera nogulumos

Author

Prindule, Ilva, Sohar, Kadri, and Latvijas Universitāte. Ģeogrāfijas un Zemes zinātņu fakultāte

Subjects
Ģeoloģija
Abstract

Bakalaura darbā ir atspoguļoti pētījuma rezultāti par Dreimaņu ezera paleovides apstākļu rekonstrukciju, izmantojot ostrakodu metodi. Ostrakodu subfosīliju pētījumi Eiropā un kaimiņvalstīs ir plaši izmantoti, bet Latvijā notiek pirmo reizi, lai gan apstākļi pētniecībai ir labvēlīgi. Iegūti jauni dati par saldūdens karbonātu uzkrāšanos Dreimaņu ezera nogulumos kopš vēlā driasa līdz subatlantiskajam laikam. Paleovides atspoguļojumam nogulumu uzkrāšanās gaitā kā galvenā metode izvēlēti ostrakodi. Izvērtējot ostrakodu sugu sabiedrības, iegūti kvantitatīvi rezultāti par ezera attīstību, ūdens līmeņa svārstībām un temperatūras izmaiņām baseinā. Konstatētās ostrakodu sabiedrības izmaiņas pārejā no pleistocēna uz holocēnu apstiprina arī papildus izmantotie augu makroatlieku un sporu un putekšņu analīzes dati. Atslēgas vārdi: Latvija, holocēns, saldūdens, ostrakodi, karbonāti., Results of Bachelor thesis is reconstruction of lake history in Dreimaņu site by ostracod data. Investigation of ostracode subfossils in Europe and neighboor countries are used widely, but in Latvia for the first time although environment is favourable. In thesis there are new findings of freshwater carbonates accumulation in Dreimaņu site since Late Pleistocene to end of Holocene. Ostracods are used as main paleoindicators. Results from invstigation of ostracod associations about lake development, water level and temperature changes are quantitative. Changes during the Late Pleistocene and the Holocene along the ostracod results are approved with plant macroremain and pollen analysis. Key words: Latvia, Holocene, lacustrine, ostracods, carbonates.

Published
2010

Catalog

Books, media, physical & digital resources
See catalog results