Differences in size distribution of marine phytoplankton in presence versus absence of jellyfish support theoretical predictions on top-down control patterns along alternative energy pathways

Type Article
Date 2019-12
Language English
Author(s) Wollrab Sabine1, Pondaven Philippe2, Behl Stephan2, 3, Beker Beatriz2, Stibor Herwig2, 3
Affiliation(s) 1 : Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany
2 : Université de Brest Laboratoire des Sciences de l’Environnement Marin LEMAR UMR 6539, Institut Universitaire Européen de la Mer, Rue Dumont d’Urville, 29280, Plouzané, France
3 : Department Biologie II, Ludwig-Maximilians-Universität München, Grosshaderner Strasse 2, 82152, Planegg-Martinsried, Germany
Source Marine Biology (0025-3162) (Springer Science and Business Media LLC), 2019-12 , Vol. 167 , N. 1 , P. 9p.
DOI 10.1007/s00227-019-3621-2
WOS© Times Cited 2
Abstract

While theoretical food web studies highlight the importance of alternative energy pathways in shaping community response to bottom-up and top-down forcing, empirical insight on the relevance of the predicted patterns is largely lacking. In marine plankton food webs differences in food size spectra between ciliates and copepods lead to alternative energy pathways, one expanding from small phytoplankton over ciliates to copepods, the other from large edible phytoplankton directly to copepods. Correspondingly, predation pressure by copepods leads to an increase of small phytoplankton through top-down control of copepods on ciliates, but to a decrease of large phytoplankton through direct predation by copepods. Hence, food web theory predicts a shift from the dominance of large to small algae along an enrichment gradient. This prediction clearly deviates from the general assumption of a shift from small fast growing to larger slow-growing phytoplankton taxa with increasing nutrient availability. However, if copepods themselves are under top-down control by strong predation through planktivores such as fish or jellyfish, dominance of large algae is expected throughout the enrichment gradient. We tested these predictions by analyzing the phytoplankton composition from numerous marine lakes and lagoon sites located on the archipelago of Palau covering a wide range of nutrient levels, comparing sites lacking large numbers of higher trophic levels with sites harboring high densities of jellyfish. The observed patterns strongly support that higher trophic levels influence the phytoplankton size distribution along a nutrient enrichment gradient, highlighting the importance of alternate energy pathways in food webs for community responses.

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Wollrab Sabine, Pondaven Philippe, Behl Stephan, Beker Beatriz, Stibor Herwig (2019). Differences in size distribution of marine phytoplankton in presence versus absence of jellyfish support theoretical predictions on top-down control patterns along alternative energy pathways. Marine Biology, 167(1), 9p. Publisher's official version : https://doi.org/10.1007/s00227-019-3621-2 , Open Access version : https://archimer.ifremer.fr/doc/00606/71788/