Anadromy and residency in steelhead and rainbow trout (Oncorhynchus mykiss): a review of the processes and patterns Public Deposited

http://ir.library.oregonstate.edu/concern/articles/kd17cv54v

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by NRC Research Press and can be found at:  http://www.nrcresearchpress.com/journal/cjfas.

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  • Oncorhynchus mykiss form partially migratory populations with anadromous fish that undergo marine migrations and residents that complete their life cycle in fresh water. Many populations’ anadromous components are threatened or endangered, prompting interest in understanding ecological and evolutionary processes underlying anadromy and residency. In this paper, we synthesize information to better understand genetic and environmental influences on O. mykiss life histories, identify critical knowledge gaps, and suggest next steps. Anadromy and residency appear to reflect interactions among genetics, individual condition, and environmental influences. First, an increasing body of literature suggests that anadromous and resident individuals differ in the expression of genes related to growth, smoltification, and metabolism. Second, the literature supports the conditional strategy theory, where individuals adopt a life history pattern based on their conditional status relative to genetic thresholds along with ultimate effects of size and age at maturation and iteroparity. However, except for a generally positive association between residency and high lipid content plus a large attainable size in fresh water, the effects of body size and growth are inconsistent. Thus, individuals can exhibit plasticity in variable environments. Finally, patterns in anadromy and residency among and within populations suggested a wide range of possible environmental influences at different life stages, from freshwater temperature to marine survival. Although we document a number of interesting correlations, direct tests of mechanisms are scarce and little data exist on the extent of residency and anadromy. Consequently, we identified as many data gaps as conclusions, leaving ample room for future research.
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  • Kendall, N. W., McMillan, J. R., Sloat, M. R., Buehrens, T. W., Quinn, T. P., Pess, G. R., ... & Zabel, R. W. (2015). Anadromy and residency in steelhead and rainbow trout Oncorhynchus mykiss: a review of the processes and patterns. Canadian Journal of Fisheries and Aquatic Sciences, 72(3), 319-342. doi:10.1139/cjfas-2014-0192
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  • description.provenance : Made available in DSpace on 2015-04-29T18:19:12Z (GMT). No. of bitstreams: 1 SloatMatthewForestryAnadromyResidencySteelhead.pdf: 2010468 bytes, checksum: 9cb88527583a9526926f37fb5cc3078d (MD5) Previous issue date: 2015-03
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2015-04-29T18:19:12Z (GMT) No. of bitstreams: 1 SloatMatthewForestryAnadromyResidencySteelhead.pdf: 2010468 bytes, checksum: 9cb88527583a9526926f37fb5cc3078d (MD5)
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2015-04-29T18:18:59Z No. of bitstreams: 1 SloatMatthewForestryAnadromyResidencySteelhead.pdf: 2010468 bytes, checksum: 9cb88527583a9526926f37fb5cc3078d (MD5)

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