NDLI: Near absence of hybridization between sauger and introduced walleye despite massive releases

Content Provider	Springer Nature Link
Author	Bingham, Daniel M. Leary, Robb F. Painter, Sally Allendorf, Fred W.
Copyright Year	2011
Abstract	We analyzed 11 microsatellite loci to determine the genetic population structure of saugers and to describe the amount and pattern of hybridization with widely introduced walleyes in the upper Missouri River drainage. We detected significant genetic differentiation among saugers spawning upstream and downstream of the confluence of the Bighorn and Yellowstone Rivers. Samples from upstream of the confluence had significantly lower heterozygosity and allelic richness. We suspect this reflects isolation at the periphery of the species’ range and possibly genetic drift resulting from recent population contractions due to dams, diversions, and water development. We detected only eighteen hybrids out of 925 individuals analyzed. Hybridization appeared recent, as nearly 50% of the hybrids showed significant evidence for having a non-hybrid ancestor within two generations. All but one hybrid were detected in the Yellowstone River drainage, despite a substantially higher rate of walleye stocking in the Missouri River drainage, suggesting conditions in the Yellowstone may be more conducive to hybridization. Rarity of hybridization is unexpected, given both massive walleye releases and previous findings of more frequent hybridization in the study area. Introgression of walleye genes into native saugers does not appear to be an immediate threat.
Starting Page	509
Ending Page	523
Page Count	15
File Format	PDF
ISSN	15660621
Journal	Conservation Genetics
Volume Number	13
Issue Number	2
e-ISSN	15729737
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-12-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sauger Walleye Hybridization Population structure Diagnostic microsatellite Plant Sciences Animal Anatomy / Morphology / Histology Evolutionary Biology Conservation Biology/Ecology
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics

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