A genetic evaluation of relatedness for broodstock management of captive,endangered Snake River sockeye salmon, <Emphasis Type="Italic">Oncorhynchus nerka</Emphasis> |
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Authors: | Christine C Kozfkay Matthew R Campbell Jeff A Heindel Danny J Baker Paul Kline Madison S Powell Thomas Flagg |
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Institution: | (1) Idaho Department of Fish and Game, 1800 Trout Road, Eagle, ID 83616, USA;(2) Hagerman Fish Culture Experimental Station, 3059F National Fish Hatchery Road, Hagerman, ID 8333, USA;(3) NOAA Fisheries, Northwest Fish Science Center, Manchester Research Station, P.O. Box 130, Manchester, WA 98353, USA |
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Abstract: | The use of captive broodstocks is becoming more frequently employed as the number of species facing endangerment or extinction
throughout the world increases. Efforts to rebuild the endangered Snake River sockeye salmon, Oncorhynchus nerka, population have been ongoing for over a decade, but the use of microsatellite data to develop inbreeding avoidance matrices
is a more recent component to the program. This study used known genealogical relationships among sockeye salmon offspring
to test four different pairwise relatedness estimators and a maximum-likelihood (M-L) relatedness estimator. The goal of this
study was to develop a breeding strategy with these estimators that would minimize the loss of genetic diversity, minimize
inbreeding, and determine how returning anadromous adults are incorporated into the broodstock along with full-term hatchery
adults. Results of this study indicated that both the M
xy and R
QG estimators had the lowest Type II error rates and the M-L and R
R estimators had the lowest Type I error rates. An approach that utilizes a combination of estimators may provide the most
valuable information for managers. We recommend that the M-L and R
R methods be used to rank the genetic importance of returning adults and the M
xy or R
QG estimators be used to determine which fish to pair for spawning. This approach provides for the best genetic management of
this captive, endangered population and should be generally applicable to the genetic management of other endangered stocks
with no pedigree. |
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Keywords: | Relatedness Sockeye salmon Inbreeding Genetic diversity |
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