BIO220H1 Chapter Reading 1: Evolution: Unnatural Selection BIO220
38
BIO220H1 Full Course Notes
Verified Note
38 documents
Document Summary
Large and rapid phenotypic changes have profound implications, whether they are evolutionary or plastic. Fishing causes the evolution of sexual maturation to happen at younger ages and smaller sizes. Commercial fishing can exceed natural mortality by as much as 400% If females delay maturation until they are larger they could have a total lifetime reproductive fitness of zero. Effect of selection much stronger, because the fish will be killed before having the chance to reproduce. Outpaces changes arising from natural agents by 300% A population is expected to recover slower from genetic than plastic changes and genetic change may even be irreversible.
