1
|
Scribner KT, Soiseth C, McGuire J, Sage GK, Thorsteinson L, Nielsen JL, Knudsen E. Genetic assessment of the effects of streamscape succession on coho salmon Oncorhynchus kisutch colonization in recently deglaciated streams. J Fish Biol 2017; 91:195-218. [PMID: 28523791 DOI: 10.1111/jfb.13337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 04/20/2017] [Indexed: 06/07/2023]
Abstract
Measures of genetic diversity within and among populations and historical geomorphological data on stream landscapes were used in model simulations based on approximate Bayesian computation (ABC) to examine hypotheses of the relative importance of stream features (geomorphology and age) associated with colonization events and gene flow for coho salmon Oncorhynchus kisutch breeding in recently deglaciated streams (50-240 years b.p.) in Glacier Bay National Park (GBNP), Alaska. Population estimates of genetic diversity including heterozygosity and allelic richness declined significantly and monotonically from the oldest and largest to youngest and smallest GBNP streams. Interpopulation variance in allele frequency increased with increasing distance between streams (r = 0·435, P < 0·01) and was inversely related to stream age (r = -0·281, P < 0·01). The most supported model of colonization involved ongoing or recent (<10 generations before sampling) colonization originating from large populations outside Glacier Bay proper into all other GBNP streams sampled. Results here show that sustained gene flow from large source populations is important to recently established O. kisutch metapopulations. Studies that document how genetic and demographic characteristics of newly founded populations vary associated with successional changes in stream habitat are of particular importance to and have significant implications for, restoration of declining or repatriation of extirpated populations in other regions of the species' native range.
Collapse
Affiliation(s)
- K T Scribner
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI, 48824-1222, U.S.A
- Department of Integrative Biology, Michigan State University, East Lansing, MI, 48824-1222, U.S.A
| | - C Soiseth
- Glacier Bay National Park and Preserve, P. O. Box 140, Gustavus, AK, 99826, U.S.A
| | - J McGuire
- Department of Integrative Biology, Michigan State University, East Lansing, MI, 48824-1222, U.S.A
| | - G K Sage
- U. S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK, 99508, U.S.A
| | - L Thorsteinson
- Alaska Region, U. S. Geological Survey, 250 Egan Drive, Juneau, AK, 99801, U.S.A
| | - J L Nielsen
- U. S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK, 99508, U.S.A
| | - E Knudsen
- U. S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK, 99508, U.S.A
| |
Collapse
|