Direction and magnitude of natural selection on body size differs among age classes of seaward migrating Pacific salmon

Marta Ulaski, Heather Finkle & Peter Westley
Due to the mediating role of body size in determining fitness, the ‘bigger is better’ hypothesis still pervades evolutionary ecology despite evidence that natural selection on phenotypic traits varies in time and space. For Pacific salmon (genus Oncorhynchus), most individual studies quantify selection across a narrow range of sizes and ages; therefore, uncertainties remain concerning how selection on size may differ among diverse life-histories. Here, we quantify the direction and magnitude of natural selection on...
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6 downloads reported since publication in 2020.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?