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|Title:||Can Feeding of Fish on Terrestrial Insects Subsidize the Nutrient Pool of Lakes?|
|Authors:||MEHNER Thomas; IHLAU Jan; DOERNER HENDRIK; HOELKER FRANZ|
|Citation:||LIMNOLOGY AND OCEANOGRAPHY vol. 50 no. 6 p. 2022-2031|
|Publisher:||AMER SOC LIMNOLOGY OCEANOGRAPHY|
|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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