Can Feeding of Fish on Terrestrial Insects Subsidize the Nutrient
Pool of Lakes?
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.
MEHNER Thomas;
IHLAU Jan;
DOERNER Hendrik;
HOELKER Franz;
2005-12-20
AMER SOC LIMNOLOGY OCEANOGRAPHY
JRC31186
https://publications.jrc.ec.europa.eu/repository/handle/JRC31186,
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