Contribution
Large daphniids are keystone species that link fish predation and phytoplankton in trophic cascades
Ogorelec, Žiga; Wunsch, Carsten; Kunzmann, Alessandra Janina; Octorina, Pelita; Navarro, Jana Isanta
Fundamental and Applied Limnology Volume 194 Nr. 4 (2021), p. 297 - 309
67 références bibliographiques
publié: Feb 25, 2021
publication en ligne: Nov 26, 2020
manuscrit accepté: Oct 12, 2020
révision final du manuscrit reçu: Oct 12, 2020
révision du manuscrit demandée: Sep 12, 2020
manuscrit reçu: Jun 20, 2020
Open Access (article peut être télechargé gratuitement)
Abstract
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.
Mots-clefs
Cladocera • Daphnia • food chain • ecosystem dynamics • oligotrophic lake • pelagic • trophic cascading