Ecophysiological determinants of the variation in 137Cs concentrations between and within lacustrine fish populations

• Title: Ecophysiological determinants of the variation in 137Cs concentrations between and within lacustrine fish populations

Author: Marcus Sundbom and Markus Meili

Reference: Canadian Journal of Fisheries & Aquatic Sciences. Dec2005, Vol. 62 Issue 12, p2727-2739. 13p.

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Keywords: *CHERNOBYL Nuclear Accident, Chornobyl, Ukraine, 1986*FISHES*FISH populations*CONTAMINATION (Technology)*BODY size*ECOLOGY*PISCIVOROUS fishes*SPECIES

Abstract: One decade after the Chernobyl fallout, the variability of 137Cs activity concentrations among fish within a Swedish lake was >20-fold based on 1361 individuals from seven species collected continually during 1996–1999. Of the total variability, 64% was due to differences between species but only 7% due to temporal variation, which was 1.3-fold for the whole community and 1.3- to 2-fold for population means. Contamination increased with body size (0.6- to 6-fold) and decreased with body condition in most species (1.3-fold). Body size and time together accounted for about half of the total variation within populations.

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