Does ocean acidification affect North Sea microzooplankton communities?
In order to assess the effects of ocean acidification (OA) on natural plankton communities, a large-scale mesocosm experiment was conducted in Gullmar Fjord (North Sea) from a spring bloom to a mid-summer situation. Here, the emphasis was on the pivotal role of microzooplankton (MZP) as trophic inte...
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ftawi:oai:epic.awi.de:39056 2024-09-15T18:27:57+00:00 Does ocean acidification affect North Sea microzooplankton communities? Horn, Henriette Sander, Nils Algueró, Maria Löder, Martin Boersma, Maarten Riebesell, Ulf Aberle-Malzahn, Nicole 2015-09-23 https://epic.awi.de/id/eprint/39056/ https://hdl.handle.net/10013/epic.46333 unknown Horn, H. , Sander, N. , Algueró, M. , Löder, M. , Boersma, M. orcid:0000-0003-1010-026X , Riebesell, U. and Aberle-Malzahn, N. (2015) Does ocean acidification affect North Sea microzooplankton communities? , European Marine Biology Symposium, Helgoland, Germany, 21 September 2015 - 25 September 2015 . hdl:10013/epic.46333 EPIC3European Marine Biology Symposium, Helgoland, Germany, 2015-09-21-2015-09-25 Conference notRev 2015 ftawi 2024-06-24T04:12:21Z In order to assess the effects of ocean acidification (OA) on natural plankton communities, a large-scale mesocosm experiment was conducted in Gullmar Fjord (North Sea) from a spring bloom to a mid-summer situation. Here, the emphasis was on the pivotal role of microzooplankton (MZP) as trophic intermediary between the microbial loop and higher trophic levels. Due to its high specific growth and grazing rates, MZP has a strong impact on phytoplankton standing stocks which can lead to dietary competition between MZP and mesozooplankton. Furthermore, the ability of MZP to act as trophic upgraders for mesozooplankton by buffering nutritional imbalances of algae might gain importance given the expected decrease in algal food quality with OA. We present data on MZP communities (abundance, biomass, taxonomic composition) with emphasis on phytoplankton-MZP-mesozooplankton interactions. Overall, two phytoplankton peaks occurred (1st peak: around day 30, 2nd peak: around day 50). While there was no direct numerical response of MZP biomass to increases in phytoplankton biomass during the 1st peak, a clear numerical response of MZP to the 2nd peak was observed. However, no significant differences in MZP biomass with regard to the different CO2 scenarios occurred. In general, the ciliate community was dominated by small Strombidiids and no clear CO2 impacts on the ciliate community composition could be detected. Additional grazing experiments conducted during the 1st phytoplankton peak showed negative phytoplankton growth rates throughout. MZP grazing could only be detected in some of the low pCO2 treatments, pointing towards complex responses of MZP communities to OA. Conference Object Ocean acidification Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
In order to assess the effects of ocean acidification (OA) on natural plankton communities, a large-scale mesocosm experiment was conducted in Gullmar Fjord (North Sea) from a spring bloom to a mid-summer situation. Here, the emphasis was on the pivotal role of microzooplankton (MZP) as trophic intermediary between the microbial loop and higher trophic levels. Due to its high specific growth and grazing rates, MZP has a strong impact on phytoplankton standing stocks which can lead to dietary competition between MZP and mesozooplankton. Furthermore, the ability of MZP to act as trophic upgraders for mesozooplankton by buffering nutritional imbalances of algae might gain importance given the expected decrease in algal food quality with OA. We present data on MZP communities (abundance, biomass, taxonomic composition) with emphasis on phytoplankton-MZP-mesozooplankton interactions. Overall, two phytoplankton peaks occurred (1st peak: around day 30, 2nd peak: around day 50). While there was no direct numerical response of MZP biomass to increases in phytoplankton biomass during the 1st peak, a clear numerical response of MZP to the 2nd peak was observed. However, no significant differences in MZP biomass with regard to the different CO2 scenarios occurred. In general, the ciliate community was dominated by small Strombidiids and no clear CO2 impacts on the ciliate community composition could be detected. Additional grazing experiments conducted during the 1st phytoplankton peak showed negative phytoplankton growth rates throughout. MZP grazing could only be detected in some of the low pCO2 treatments, pointing towards complex responses of MZP communities to OA. |
format |
Conference Object |
author |
Horn, Henriette Sander, Nils Algueró, Maria Löder, Martin Boersma, Maarten Riebesell, Ulf Aberle-Malzahn, Nicole |
spellingShingle |
Horn, Henriette Sander, Nils Algueró, Maria Löder, Martin Boersma, Maarten Riebesell, Ulf Aberle-Malzahn, Nicole Does ocean acidification affect North Sea microzooplankton communities? |
author_facet |
Horn, Henriette Sander, Nils Algueró, Maria Löder, Martin Boersma, Maarten Riebesell, Ulf Aberle-Malzahn, Nicole |
author_sort |
Horn, Henriette |
title |
Does ocean acidification affect North Sea microzooplankton communities? |
title_short |
Does ocean acidification affect North Sea microzooplankton communities? |
title_full |
Does ocean acidification affect North Sea microzooplankton communities? |
title_fullStr |
Does ocean acidification affect North Sea microzooplankton communities? |
title_full_unstemmed |
Does ocean acidification affect North Sea microzooplankton communities? |
title_sort |
does ocean acidification affect north sea microzooplankton communities? |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/39056/ https://hdl.handle.net/10013/epic.46333 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
EPIC3European Marine Biology Symposium, Helgoland, Germany, 2015-09-21-2015-09-25 |
op_relation |
Horn, H. , Sander, N. , Algueró, M. , Löder, M. , Boersma, M. orcid:0000-0003-1010-026X , Riebesell, U. and Aberle-Malzahn, N. (2015) Does ocean acidification affect North Sea microzooplankton communities? , European Marine Biology Symposium, Helgoland, Germany, 21 September 2015 - 25 September 2015 . hdl:10013/epic.46333 |
_version_ |
1810469247386648576 |