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Long-term variation in the littoral food web of an acidified mountain lake

Layer, Katrin; Hildrew, Alan; Monteith, Don; Woodward, Guy. 2010 Long-term variation in the littoral food web of an acidified mountain lake. Global Change Biology, 16. 3133-3143. 10.1111/j.1365-2486.2010.02195.x

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Abstract/Summary

Evidence of chemical recovery from acidification in European freshwaters has emerged in recent years, with many previously damaged systems responding to decades of reduced acidifying emissions. Biological recovery, however, has often lagged behind, and this has been ascribed to several possible mechanisms, including inertia in the food web. We examined two decades of change in hindcasted food webs for Lochnagar, a Scottish mountain lake, to make inferences about the potential dynamical stability of the system and to assess the prospects for future biological recovery. Although community composition tracked temporal changes in acidity, this was neither sustained nor directional, and mainly manifested as shifts in relative abundances rather than the establishment of more acidsensitive species. The food web was highly interconnected and reticulate, especially in years when species richness was low, and subsidized by external inputs of detritus. Among the primary consumers, generalist herbivore– detritivores maintained feeding links with the scant algal resources, which appeared insufficient to support viable populations of specialist grazers. Together, these characteristics, which are shared with many other acidified freshwaters, are likely to make the community dynamically stable and resistant to invasions of potential new colonists, thereby slowing the pace of future biological recovery.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1365-2486.2010.02195.x
Programmes: CEH Topics & Objectives 2009 onwards > Biodiversity > BD Topic 2 - Ecological Processes in the Environment > BD - 2.1 - Interactions ... structure ecosystems and their functioning
CEH Topics & Objectives 2009 onwards > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity > BD - 1.3 - Long-term/large-scale monitoring and experiments ...
CEH Sections: Parr
ISSN: 1354-1013
Additional Keywords: acidification, community ecology, detritivory, herbivory, predation, stable isotope analysis, trophic interactions
NORA Subject Terms: Biology and Microbiology
Ecology and Environment
Date made live: 02 Nov 2010 14:59
URI: http://nora.nerc.ac.uk/id/eprint/10904

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