An isotopic analysis of the phytoplankton–zooplankton link in a highly eutrophic tropical reservoir dominated by cyanobacteria

An isotopic analysis of the phytoplankton–zooplankton link in a highly eutrophic tropical... AbstractLake eutrophication often results in the dominance of cyanobacteria, which are generally regarded as an unsuitable food source for zooplankton, though this is still under debate. Here we tested whether small sestonic particles are the dominant component of the diet of zooplankton during periods of cyanobacterial dominance. For this, the contribution of seston fractions (<20 µm and ≥20 < 100 µm) to zooplankton diets was assessed at the species level in a highly eutrophic tropical reservoir in Ethiopia using dual isotope (δ15N and δ13C) SIAR and MixSIAR models. Posterior area estimates of both consumer species and potential food sources were also modeled. Results of the two models indicated that the general diet of the zooplankton was composed primarily of small seston particles. Analysis of isotopic niche breadth of the two major crustacean zooplankton species, Ceriodaphnia cornuta and Thermocyclops decipiens, indicated that it was generally larger for the former species indicating consumption of a different prey and/or change in feeding strategy of both species. Overall, our field study indicates that under cyanobacterial dominance, zooplankton feed on small seston particles and that grazing on colonial or filamentous cyanobacteria seems not to be a generalized pattern in tropical freshwater reservoirs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Plankton Research Oxford University Press

An isotopic analysis of the phytoplankton–zooplankton link in a highly eutrophic tropical reservoir dominated by cyanobacteria

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Publisher
Oxford University Press
Copyright
© The Author 2017. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com
ISSN
0142-7873
eISSN
1464-3774
D.O.I.
10.1093/plankt/fbx007
Publisher site
See Article on Publisher Site

Abstract

AbstractLake eutrophication often results in the dominance of cyanobacteria, which are generally regarded as an unsuitable food source for zooplankton, though this is still under debate. Here we tested whether small sestonic particles are the dominant component of the diet of zooplankton during periods of cyanobacterial dominance. For this, the contribution of seston fractions (<20 µm and ≥20 < 100 µm) to zooplankton diets was assessed at the species level in a highly eutrophic tropical reservoir in Ethiopia using dual isotope (δ15N and δ13C) SIAR and MixSIAR models. Posterior area estimates of both consumer species and potential food sources were also modeled. Results of the two models indicated that the general diet of the zooplankton was composed primarily of small seston particles. Analysis of isotopic niche breadth of the two major crustacean zooplankton species, Ceriodaphnia cornuta and Thermocyclops decipiens, indicated that it was generally larger for the former species indicating consumption of a different prey and/or change in feeding strategy of both species. Overall, our field study indicates that under cyanobacterial dominance, zooplankton feed on small seston particles and that grazing on colonial or filamentous cyanobacteria seems not to be a generalized pattern in tropical freshwater reservoirs.

Journal

Journal of Plankton ResearchOxford University Press

Published: Mar 1, 2017

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