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- Title
Seasonal, inter-annual and long term variation in top-down versus bottom-up regulation of primary production.
- Authors
Kerimoglu, Onur; Straile, Dietmar; Peeters, Frank
- Abstract
Environmental change strongly affects primary productivity of ecosystems via modifying bottom-up and top-down regulation of primary producers. Here we present a novel approach to quantify the relative importance of regulating factors in natural systems over various time scales: we calculated daily effect sizes of major factors affecting phytoplankton growth during the spring bloom period during almost three decades of lake oligotrophication using numerical experiments with a data based simulation model. We show that with oligotrophication the regulation of spring phytoplankton shifts from primarily top-down to bottom-up, and that the changes in regulation are non-linearly related to the nutrient (phosphorus) concentrations. Our findings indicate that long-term changes in top-down regulation cannot be understood without considering multiple herbivore taxa, here, microzooplankton (ciliates) and mesozooplankton (daphnids). We further demonstrate that bottom-up and top-down regulation are not independent from each other and that their interaction is time-scale dependent.
- Subjects
PRIMARY productivity (Biology); PHYTOPLANKTON; BIOTIC communities; GLOBAL environmental change; BIOLOGICAL productivity; SIMULATION methods &; models
- Publication
Oikos, 2013, Vol 122, Issue 2, p223
- ISSN
0030-1299
- Publication type
Article
- DOI
10.1111/j.1600-0706.2012.20603.x