Crappie Hybridization in Southern Minnesota Lakes and Its Effects on Growth Estimates

Autor: Jason Roloff, Loren M. Miller, Michael C. McInerny
Rok vydání: 2008
Předmět:
Zdroj: North American Journal of Fisheries Management. 28:1120-1131
ISSN: 1548-8675
0275-5947
Popis: Species-specific microsatellite DNA markers were used to identify hybrids of black crappies Pomoxis nigromaculatus and white crappies P. annularis and to determine the effect of hybridization on crappie growth. Specifically, we determined the contribution of hybrids to the skew in length frequency distributions that is frequently observed within year-classes of sympatric crappie populations and the resulting upward bias on growth estimates for the two species. Hybridization was found throughout most southern Minnesota lakes that contained both species, but the frequency of hybrids was low in our length-stratified subsamples (mean frequency of first-generation (F1) hybrids among all lakes and year-classes = 3.2%; mean frequency of advanced-generation (Fx) hybrids = 1.4%). Among the 22 study lakes, only 2 contained no hybrids (based on polymerase chain reaction amplification of microsatellite loci). The F1 hybrids were disproportionately classified as black crappies under a Minnesota Department of ...
Databáze: OpenAIRE
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