Mating Success of Alternative Male Phenotypes and Evidence for Frequency-Dependent Selection in Chinook Salmon, Oncorhynchus Tshawytscha - 2010

Identification Information

Citation

Originator: Berejikian, B. A., D. M. Van Doornik, R. C. Endicott, T. L. Hoffnagle, E. P. Tezak, M. E. Moore, J. Atkins

Publish Date: 2010

Online Link: https://www.fws.gov/lsnakecomplan/Reports/ODFWreports.html

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Joseph Feldhaus

Job Position: Assistant Project Leader

Telephone: 541-962-3724

E-Mail Address: Joseph.Feldhaus@odfw.oregon.gov

Description

Abstract: As with other species, frequency-dependent selection during reproduction has long been proposed as an important mechanism in maintaining alternative male reproductive phenotypes in Pacific salmon (Oncorhynchus spp.). Jack salmon mature one year earlier than the youngest females in a population and are much smaller than older ‘‘adult’’ males. We tested the hypothesis that mating success of both phenotypes is consistent with the frequency-dependent selection model. By holding male density constant and varying the frequency of adults and jacks in eight separate breeding groups, we found that adult male access to females, participation in spawning events, and adult-to-fry reproductive success increased with their decreasing frequency in a breeding group. Jacks exhibited the same pattern (increasing success with decreasing frequency), although the relationships were not as strong as for adults. Overall, jack and adult males mated with a similar number of females, but jacks sired only 20% of all offspring. Observational data suggested that adult males benefited from sperm precedence associated with their ability to court females and enter the nest first at the time of spawning. Our work provides the first experimental evidence of frequency-dependent selection during mating in the family Salmonidae. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR)

Purpose:

Time Period of Content: 2007-2008

Geographic Extent: Trask River and Fall Creek

Status: Final

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Format: pdf

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