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Population differences in early life‐history traits in grayling
Author(s) -
Haugen T. O.,
Vøllestad L. A.
Publication year - 2000
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1046/j.1420-9101.2000.00242.x
Subject(s) - biology , grayling , hatching , population , life history theory , adaptation (eye) , selection (genetic algorithm) , natural selection , ecology , zoology , life history , demography , arctic , neuroscience , artificial intelligence , sociology , computer science
In this paper we test population differences in early life‐history traits in three grayling Thymallus thymallus populations. The grayling shared ancestors some 80–90 years ago. We performed common‐garden experiments at three temperatures (mimicking population‐specific summer temperatures), and measured survival and growth rates during early development. We found significant additive genetic variance in size (length and yolk‐sac volume) measured at hatching, swim‐up and termination of the experiment, and significantly different reaction norms for growth rate and survival during the period of first feeding. In general, each population did best at the temperature experienced in nature. These differences in early life‐history traits suggest that natural selection has resulted in local adaptation in a time period of 13–18 generations.