Large daphniids are keystone species that link fish predation and phytoplankton in trophic cascades

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2021
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Fundamental and Applied Limnology. Schweizerbart Science Publishers. 2021, 194(4), pp. 297-309. ISSN 1863-9135. eISSN 2363-7110. Available under: doi: 10.1127/fal/2020/1344
Zusammenfassung

Daphniids act as keystone species in lake ecosystems by controlling phytoplankton biomass and experiencing intense fish predation. However, the importance of single daphniid species as trophic links between phytoplankton and fish remains unclear, especially compared with other zooplankton taxa. To disentangle the role of individual zooplankton taxa in the food web of a large lake, we performed an in-situ mesocosm experiment with natural phytoplankton and zooplankton communities in three treatments with native, invasive or no fish predators, respectively. A large daphniid, Daphnia longispina, was the zooplankter most strongly predated by both fish species, and also had the highest top-down effects on phytoplankton. All other zooplankton taxa, including a small daphniid species, had minor roles in terms of both predation by fish and grazing on phytoplankton. We suggest that daphniid species with large body sizes can strongly link higher and lower trophic levels in lake food webs, and thus function as keystone species in trophic cascades from fish to phytoplankton.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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Cladocera; Daphnia; food chain; ecosystem dynamics; oligotrophic lake; pelagic; trophic cascading
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ISO 690OGORELEC, Ziga, Carsten WUNSCH, Alessandra Janina KUNZMANN, Pelita OCTORINA, Jana ISANTA-NAVARRO, 2021. Large daphniids are keystone species that link fish predation and phytoplankton in trophic cascades. In: Fundamental and Applied Limnology. Schweizerbart Science Publishers. 2021, 194(4), pp. 297-309. ISSN 1863-9135. eISSN 2363-7110. Available under: doi: 10.1127/fal/2020/1344
BibTex
@article{Ogorelec2021Large-53253,
  year={2021},
  doi={10.1127/fal/2020/1344},
  title={Large daphniids are keystone species that link fish predation and phytoplankton in trophic cascades},
  number={4},
  volume={194},
  issn={1863-9135},
  journal={Fundamental and Applied Limnology},
  pages={297--309},
  author={Ogorelec, Ziga and Wunsch, Carsten and Kunzmann, Alessandra Janina and Octorina, Pelita and Isanta-Navarro, Jana}
}
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