Can fish introductions alter nutrient cycles in previously fishless high-latitude lakes?

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http://hdl.handle.net/10138/178879

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Milardi , M , Lappalainen , J , McGowan , S & Weckström , J 2017 , ' Can fish introductions alter nutrient cycles in previously fishless high-latitude lakes? ' , Journal of Limnology , vol. 76 , no. 1 , pp. 1-14 . https://doi.org/10.4081/jlimnol.2016.1364

Title: Can fish introductions alter nutrient cycles in previously fishless high-latitude lakes?
Author: Milardi, Marco; Lappalainen, Jyrki; McGowan, Suzanne; Weckström, Jan
Contributor: University of Helsinki, Environmental Sciences
University of Helsinki, Environmental Sciences
University of Helsinki, Environmental Sciences
Date: 2017
Language: eng
Number of pages: 14
Belongs to series: Journal of Limnology
ISSN: 1129-5767
URI: http://hdl.handle.net/10138/178879
Abstract: The additional input and enhanced cycling of nutrients derived from introduced fish can be a significant factor altering nutrient dynamics in oligotrophic lakes. To test this, we used a bioenergetic model to estimate the fish-derived nutrient load in Lake Kuutsjurvi, a historically fishless boreal lake of northern Fennoscandia. The lake was selected because of the absence of other anthropogenic stressors, a known stocking history and the possibility of quantitatively estimating the size-structure and biomass of the fish population through a mass removal. Subsequently, we used a mass balance model to compare fish-derived nutrients with other nutrient load pathways. For comparison over longer timescales, we used lake sediment records of diatoms, chlorophyll and carotenoid pigments, C: N ratios and stable isotopes to infer whether fish introduction produced detectable changes in the lake trophic state, primary productivity and terrestrial nutrient input. Based on the nutrient mass balance model, we found that phosphorus and nitrogen derived from fish were 0.46% and 2.2%, respectively, of the total load to the lake, suggesting that fish introduction could not markedly increase the nutrient load. Accordingly, the palaeolimnological record indicated little increase in primary production but instead a shift from pelagic to benthic production after fish introduction.
Subject: Nutrient cycle
bioenergetic model
fish introduction
chlorophyll and carotenoid pigments
diatoms
stable isotopes
FOOD WEBS
ALPINE LAKES
ASTERIONELLA-FORMOSA
COMMUNITY STRUCTURE
MOUNTAIN LAKES
ORGANIC-CARBON
REGIME SHIFTS
FLUSHED LAKE
SPRING BLOOM
BROWN TROUT
1181 Ecology, evolutionary biology
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