Title: Can Feeding of Fish on Terrestrial Insects Subsidize the Nutrient Pool of Lakes?
Authors: MEHNER ThomasIHLAU JanDOERNER HENDRIKHOELKER FRANZ
Citation: LIMNOLOGY AND OCEANOGRAPHY vol. 50 no. 6 p. 2022-2031
Publisher: AMER SOC LIMNOLOGY OCEANOGRAPHY
Publication Year: 2005
JRC N°: JRC31186
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC31186
Type: Articles in Journals
Abstract: We estimated input and excretion rates of terrestrial-borne phosphorus by the insect-feeding fish species bleak in a mesotrophic lake of the German lowlands. Fish abundance, growth rates and diet composition were determined, and consumption and nutrient metabolism be calculated. Consumption rate of bleak consisted to about 84% of terrestrial insects. Annual consumption of lake-external P by bleak represented about 2.1% of lake-internal P-pool. Annual excretion of terrestrial-derived phosphorus was equivalent to about 11% of mean epilimnetic SRP concentration. An exponential decay model revealed that a substantial subsidy of insectivorous fish is more likely in lakes smaller than three hectare due to the increasing perimeter-to-area ratio.
JRC Institute:Institute for the Protection and Security of the Citizen

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