Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake
Abstract Cultural oligotrophication is expected to shift lake zooplankton to become dominated by calanoid copepods. Hence, understanding the influence of calanoids on the taxonomic and size structure of the lower plankton food web is crucial for predicting the effects of oligotrophication on energy...
Published in: | Journal of Plankton Research |
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Online Access: | http://dx.doi.org/10.1093/plankt/fbz067 http://academic.oup.com/plankt/article-pdf/41/6/955/31804783/fbz067.pdf |
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croxfordunivpr:10.1093/plankt/fbz067 2024-06-23T07:57:30+00:00 Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake Kunzmann, Alessandra Janina Ehret, Harald Yohannes, Elizabeth Straile, Dietmar Rothhaupt, Karl-Otto Deutsche Forschungsgemeinschaft German Research Foundation 2019 http://dx.doi.org/10.1093/plankt/fbz067 http://academic.oup.com/plankt/article-pdf/41/6/955/31804783/fbz067.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Journal of Plankton Research volume 41, issue 6, page 955-966 ISSN 0142-7873 1464-3774 journal-article 2019 croxfordunivpr https://doi.org/10.1093/plankt/fbz067 2024-06-04T06:14:05Z Abstract Cultural oligotrophication is expected to shift lake zooplankton to become dominated by calanoid copepods. Hence, understanding the influence of calanoids on the taxonomic and size structure of the lower plankton food web is crucial for predicting the effects of oligotrophication on energy fluxes in these systems. We studied the effect of an omnivorous calanoid, Eudiaptomus gracilis, on the lower planktonic food web using an in situ incubation approach in large and deep Lake Constance. We show that E. gracilis significantly reduced ciliate, phytoplankton, rotifer, but increased bacteria biovolume. Highest clearance rates were observed for ciliates whose biovolume declines may have caused a release of predation pressure on bacteria. E. gracilis grazing shifted the size structure of the phytoplankton community by reducing mean phytoplankton cell size (directional selection) and simultaneously increasing cell size variance (disruptive selection). Ciliate cell sizes experienced a similar selective regime in one of the experiments, whereas in the other two experiments, no change of size structure was detected. Results suggest strong influences of E. gracilis grazing on the lower plankton food web and a significant shift in phytoplankton size structure. For evaluating detailed effects of omnivorous consumers on plankton size structure, cascading interactions need to be considered. Article in Journal/Newspaper Copepods Rotifer Oxford University Press Journal of Plankton Research 41 6 955 966 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract Cultural oligotrophication is expected to shift lake zooplankton to become dominated by calanoid copepods. Hence, understanding the influence of calanoids on the taxonomic and size structure of the lower plankton food web is crucial for predicting the effects of oligotrophication on energy fluxes in these systems. We studied the effect of an omnivorous calanoid, Eudiaptomus gracilis, on the lower planktonic food web using an in situ incubation approach in large and deep Lake Constance. We show that E. gracilis significantly reduced ciliate, phytoplankton, rotifer, but increased bacteria biovolume. Highest clearance rates were observed for ciliates whose biovolume declines may have caused a release of predation pressure on bacteria. E. gracilis grazing shifted the size structure of the phytoplankton community by reducing mean phytoplankton cell size (directional selection) and simultaneously increasing cell size variance (disruptive selection). Ciliate cell sizes experienced a similar selective regime in one of the experiments, whereas in the other two experiments, no change of size structure was detected. Results suggest strong influences of E. gracilis grazing on the lower plankton food web and a significant shift in phytoplankton size structure. For evaluating detailed effects of omnivorous consumers on plankton size structure, cascading interactions need to be considered. |
author2 |
Deutsche Forschungsgemeinschaft German Research Foundation |
format |
Article in Journal/Newspaper |
author |
Kunzmann, Alessandra Janina Ehret, Harald Yohannes, Elizabeth Straile, Dietmar Rothhaupt, Karl-Otto |
spellingShingle |
Kunzmann, Alessandra Janina Ehret, Harald Yohannes, Elizabeth Straile, Dietmar Rothhaupt, Karl-Otto Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake |
author_facet |
Kunzmann, Alessandra Janina Ehret, Harald Yohannes, Elizabeth Straile, Dietmar Rothhaupt, Karl-Otto |
author_sort |
Kunzmann, Alessandra Janina |
title |
Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake |
title_short |
Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake |
title_full |
Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake |
title_fullStr |
Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake |
title_full_unstemmed |
Calanoid copepod grazing affects plankton size structure and composition in a deep, large lake |
title_sort |
calanoid copepod grazing affects plankton size structure and composition in a deep, large lake |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/plankt/fbz067 http://academic.oup.com/plankt/article-pdf/41/6/955/31804783/fbz067.pdf |
genre |
Copepods Rotifer |
genre_facet |
Copepods Rotifer |
op_source |
Journal of Plankton Research volume 41, issue 6, page 955-966 ISSN 0142-7873 1464-3774 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/plankt/fbz067 |
container_title |
Journal of Plankton Research |
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41 |
container_issue |
6 |
container_start_page |
955 |
op_container_end_page |
966 |
_version_ |
1802651173247778816 |