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Effects of nutrients and fish on periphyton and plant biomass across a European latitudinal gradient

Bécares, E. and Gomá, J. and Fernández-Aláez, M. and Fernández-Aláez, C. and Romo, S. and Miracle Rosa, M. and Ståhl-Delbanco, A. and Hansson, L-A. and Gyllström, M. and Bund Van de, W. and Van Donk, E. and Kairesalo, T. and Hietala, J. and Stephen, D. and Balayla, D. and Moss, B. (2008) Effects of nutrients and fish on periphyton and plant biomass across a European latitudinal gradient. Aquatic Ecology, 42, 561-574. ISSN 1386-2588.

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Official URL: http://dx.doi.org/10.1007/s10452-007-9126-y

Abstract

Replicated, factorial mesocosm experiments were conducted across Europe to study the effects of nutrient enrichment and fish density on macrophytes and on periphyton chlorophyll a (chl-a) with regard to latitude. Periphyton chl-a densities and plant decline were significantly related to nutrient loading in all countries. Fish effects were significant in a few sites only, mostly because of their contribution to the nutrient pool. A saturation-response type curve in periphyton chl-a with nutrients was found, and northern lakes achieved higher densities than southern lakes. Nutrient concentration and phytoplankton chl-a necessary for a 50% plant reduction followed a latitudinal gradient. Total phosphorus values for 50% plant disappearance were similar from Sweden (0.27 mg L−1) to northern Spain (0.35 mg L−1), but with a sharp increase in southern Spain (0.9 mg L−1). Planktonic chl-a values for 50% plant reduction increased monotonically from Sweden (30 μg L−1) to València (150 μg L−1). Longer plant growing-season, higher light intensities and temperature, and strong water-level fluctuations characteristic of southern latitudes can lead to greater persistence of macrophyte biomass at higher turbidities and nutrient concentration than in northern lakes. Results support the evidence that latitudinal differences in the functioning of shallow lakes should be considered in lake management and conservation policies.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:4815
Deposited On:30 Sep 2009 02:00
Last Modified:24 Apr 2012 16:46

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