Trophic Dependence of Ecosystem Resistance and Species Compensation in Experimentally Acidified Lake 302S (Canada)
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Ecosystem resistance to the impacts of diverse human insults depends on the replacement of sensitive species by ones more tolerant of the stressor. Here we present evidence from a whole-lake acidification experiment (Lake 302S, Experimental Lakes Area, Canada) that resistance and species compensation decline with increasing trophic level. Diverse and fast-growing algal and rotifer assemblages with high dispersal potentials showed significant compensatory species dynamics, resulting in the maintenance of total biomass despite 30%–80% declines in species richness. Canonical correspondence analysis showed that significant compensatory algal and rotifer dynamics were best explained by differential species tolerances of acidified chemical conditions coupled with release from resource limitation and predation. However, less diverse cladoceran, copepod, and fish assemblages showed significant declines in total biomass and weak species compensation with loss of species during acidification. In comparison, algal and zooplankton species dynamics remained relatively synchronized in a nearby unperturbed reference lake (Lake 239) during the experiment. As a result, Lake 302S showed limited ecosystem resistance to anthropogenic acidification. Therefore, we hypothesize that lost species will increase the susceptibility of acidified lakes to the adverse impacts of other environmental stressors (for example, climate warming, stratospheric ozone depletion, invasive species). Consequently, the ecosystem stability of boreal lakes is expected to decline as global change proceeds.
- Trophic Dependence of Ecosystem Resistance and Species Compensation in Experimentally Acidified Lake 302S (Canada)
Volume 6, Issue 2 , pp 0101-0113
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- Key words: acidification; biodiversity; boreal lakes; dispersal; ecosystem stability; functional compensation; global change; species dynamics; trophic interactions.
- Author Affiliations
- A1. Freshwater Biodiversity Laboratory, Department of Biology, University of Regina, Regina, Saskatchewan, Canada S4S 0A2, CA
- A2. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9; and, CA
- A3. Freshwater Institute,, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N6, CA