Survival of juveniles increases with summer water temperature
We used the relative proportion of 1-year olds in the perch population in Lake Vaggatem and Lake Skrukkebukta as a proxy for number of individuals surviving the first critical winter. The relative proportion of one year old perch increased with mean summer water temperature (Jun-Aug) the preceding year (Fig. 3). The relative proportion of one year old perch was significantly related to temperature (p<0.001, adj-R2=0.35), increasing by 3.2 % per degree centigrade increment in preceding year summer water temperature (°C) (t=3.550 on 21 d.f., p<0.001, Appendix Table S15).