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Mating systems and predictors of relative reproductive success in a cutthroat trout subspecies of conservation concern
  • +2
  • John Hargrove,
  • Jesse McCane,
  • Curtis Roth,
  • Brett High,
  • Matthew Campbell
John Hargrove
Pacific States Marine Fisheries Commission
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Jesse McCane
Pacific States Marine Fisheries Commission
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Curtis Roth
Idaho Department of Fish and Game
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Brett High
Idaho Department of Fish and Game
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Matthew Campbell
Idaho Department of Fish and Game
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Abstract

Mating systems and patterns in reproductive success of fishes play an important role in ecology and evolution. While information on the reproductive ecology of many anadromous salmonids (Oncorhynchus spp.) is well-detailed, there is less information for non-anadromous species including the Yellowstone Cutthroat Trout (O. clarkii bouvieri), a species of recreational angling importance and conservation concern. Here, we used data from a parentage-based tagging study to describe the mating system of Yellowstone Cutthroat Trout from a spawning tributary of the South Fork Snake River, Idaho, and identify predictors of relative reproductive success. We detected evidence of monogamy, polygyny, and polyandry and showed that reproductive success was best explained by arrival time at the spawning ground and total length. Specifically, the largest adults arrived earliest in the season and produced a disproportionate number of offspring. Lastly, we estimated the effective number of breeders (Nb) and effective population size (Ne) and showed that while Nb was lower than Ne, both are sufficiently high to suggest Yellowstone Cutthroat Trout in Burns Creek represent a genetically stable and diverse population.

Peer review status:IN REVISION

07 Dec 2020Submitted to Ecology and Evolution
08 Dec 2020Assigned to Editor
08 Dec 2020Submission Checks Completed
09 Dec 2020Reviewer(s) Assigned
01 Jan 2021Review(s) Completed, Editorial Evaluation Pending
13 Mar 2021Editorial Decision: Revise Minor