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- W1039192997 abstract "This thesis examines the evolution of morphology and life history in female and male coho salmon (Oncorhynchus kisutch) in response to breeding competition, migration arduousness, and selection for egg size. Morphology and life history were examined in 13 wild and 5 hatchery populations of coho salmon. Female secondary sexual characters, including kype (an extension of the upper jaw used in fighting) and body colouration, increased significantly with degree of female competition. By contrast, arduous spawning migrations appeared to select for increased body streamlining. Both breeding competition and the difficulty of migration, thpugh nonsignificant, negatively effected ovarian investment. In hatcheries, where breeding competition is relaxed, characters associated with breeding competition and spawning performance L were reduced. Moreover, there was an increase in egg weight. Secondary sexual characters were highly dimorphic. Males had larger kypes, more intense colouration, and greater body depth. In addition, the size of the male dorsal fin, used in signals of courtship and aggression, exceeds that of females. The sexes also differed in morphology of propulsive fins, which may be related to sexual dimorphism in their risk assessment of foraging strategies. Male secondary sexual characters, like those of females, increased with breeding competition. Hatchery male morphology differed significantly from that of wild males," @default.
- W1039192997 created "2016-06-24" @default.
- W1039192997 creator A5052409460 @default.
- W1039192997 date "1986-01-01" @default.
- W1039192997 modified "2023-09-27" @default.
- W1039192997 title "Evolution of breeding life history and morphology in Coho salmon (Oncorhynchus Kisutch)" @default.
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