Search

Your search keyword '"Kunzmann, Andreas"' showing total 431 results
Start Over Author "Kunzmann, Andreas"
431 results on '"Kunzmann, Andreas"'

9. Aquaculture governance: five engagement arenas for sustainability transformation

Author

Partelow, Stefan, Asif, Furqan, Béné, Christophe, Bush, Simon, Manlosa, Aisa O, Nagel, Ben, Schlüter, Achim, Chadag, Vishnumurthy M, Choudhury, Afrina, Cole, Steven M, Cottrell, Richard S, Gelcich, Stefan, Gentry, Rebecca, Gephart, Jessica A, Glaser, Marion, Johnson, Teresa R, Jonell, Malin, Krause, Geshe, Kunzmann, Andreas, Kühnhold, Holger, Little, Dave C, Marschke, Melissa J, Mizuta, Darien D, Paramita, Adiska O, Pin, Nie, Salayo, Nerissa D, Stentiford, Grant D, Stoll, Joshua, Troell, Max, and Turchini, Giovanni M

Published
2023
Full Text
View/download PDF

22. Epizoic yellow sponge (Poecilosclerida, Demospongiae) expansion on living Scleractinian corals in Bintan, Riau Archipelago, Indonesia

Author

Johan, Ofri, Voogd, N.J. (Nicole) de, Budianto, Agus, Peters, Sonja, Aljbour, Samir M., Kunzmann, Andreas, Johan, Ofri, Voogd, N.J. (Nicole) de, Budianto, Agus, Peters, Sonja, Aljbour, Samir M., and Kunzmann, Andreas

Abstract

Coral reef ecosystems in Indonesia are under threat due to changes in the environment driven by global climate change, along with local disturbances such as sedimentation and eutrophication. Consequently, comprehensive coral reef monitoring activities have been initiated at numerous locations across Indonesia. In this study, the findings from coral reef health surveys across 14 reef sites (within 40 hectares) in the Bintan area (Riau Archipelago, Indonesia; 100 km southeast of Singapore) revealed a potentially novel epizoic yellow sponge species (Phorbas sp.) that overgrows coral colonies. This species, tentatively classified as a new Phorbas sp. (order Poecilosclerida: family Hymedesmiidae), was identified through a combined approach employing classical taxonomic methods along with DNA barcoding using the cytochrome c oxidase I (COI) gene. At every site, three permanent 20-m transects were established to annually monitor live coral coverage and species composition between 2014 and 2017. The survey indicated a notable change in the overall coral cover during this period. The abundance of coral diseases was investigated in 2014 and 2017. Additionally, the progress of Phorbas sp., was closely monitored (i.e., every second day for one week) at Bintan Island (site 11) during the dry season in August 2017. This approach aimed to approximate the relative impact of each incident on the coral's condition. The results indicated that the most comprehensive change occurred due to the overgrowth of Phorbas sp., which affected 12 scleractinian coral species across eight genera in almost all sites except one. The abundance of this epizoic sponge infestation was highest at Pulau Beralas Pasir (site 10), constituting 22.9% of all recorded life forms, and lowest at Pulau Pangkil-Besar (site 13), with only 0.7%. The expansion of the thin yellow sponge tissue was estimated to increase by up to 0.51 ± 0.48 cm2 per day on Porites coral.

Published
2024
Full Text
View/download PDF

33. Spatio-temporal variation in progression rates of black band disease between Pramuka Island and Pari Island of the Seribu Islands, Indonesia.

Author

Ofri, Ofri Johan, Ginanjar, Rendy, Rustam, Agustin, Ardi, Idil, Sholichah, Lili, Rachmawati, Rita, Siringoringo, Rikoh Manogar, Abrar, Muhammad, Ni Wayan Purnama Sari, Giyanto, Samusamu, Andrias Steward, Undap, Nani Ingrid, Puput Fitri Rachmawati, Neviaty Putri Zamani, Sweet, Michael, and Kunzmann, Andreas

Subjects
SPATIO-temporal variation, CORAL diseases, ISLANDS, LIGHT intensity, DISEASE progression
Abstract

Black band disease (BBD) is one of the oldest recognized diseases of sderactinian corals. This disease is little known on the variation of progression rates across relatively small spatial scales and how local variations in the environment can impact prevalence and spread. The purpose of this study was to explore the progression of BBD on genus Montipora in relation to spatio-temporal environmental parameters in two islands of the Seribu Islands, North Jakarta, Indonesia during dry season and rainy season. Monthly underwater pictures were taken for determining the progress of disease level. Interestingly, the progression rate of the disease recorded at Pramuka Island was higher (8.10 cm² day-1) than the one at Pari Island (3.79 cm² day-1). In Pramuka Island, the infected corals had almost 89% of the dead surface, compared to only 68% at Pari Island. Similar to other studies in the region, we confirmed that the disease progressed faster during the dry season, where the environmental parameters, such as temperature, light intensity, and phosphate, were starting to increase, while total organic matter, current flow rates, and turbidity were lower. Progression of the disease was significantly different between seasons (p<0.001), but not between sites (p=0.118). Therefore, the progress of BBD has a higher impact at the more populated Pramuka island than at the less populated Pari Island, in addition to the influence of environmental parameters on coral vulnerability to diseases. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

37. Urban coral reefs: Degradation and resilience of hard coral assemblages in coastal cities of East and Southeast Asia

Author

Heery, Eliza C., Hoeksema, Bert W., Browne, Nicola K., Reimer, James D., Ang, Put O., Huang, Danwei, Friess, Daniel A., Chou, Loke Ming, Loke, Lynette H.L., Saksena-Taylor, Poonam, Alsagoff, Nadia, Yeemin, Thamasak, Sutthacheep, Makamas, Vo, Si Tuan, Bos, Arthur R., Gumanao, Girley S., Syed Hussein, Muhammad Ali, Waheed, Zarinah, Lane, David J.W., Johan, Ofri, Kunzmann, Andreas, Jompa, Jamaluddin, Suharsono, Taira, Daisuke, Bauman, Andrew G., and Todd, Peter A.

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results