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Temporal genetic variation of mitochondrial DNA and the female effective population size of red drum ( Sciaenops ocellatus ) in the northern Gulf of Mexico
Author(s) -
Turner Thomas F.,
Richardson Linda R.,
Gold John R.
Publication year - 1999
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1046/j.1365-294x.1999.00662.x
Subject(s) - biology , effective population size , population size , inbreeding , population , mitochondrial dna , genetic drift , genetic variation , ecology , zoology , evolutionary biology , demography , genetics , gene , sociology
We studied genetic drift of mitochondrial DNA (mtDNA) haplotype frequencies in a natural population of red drum ( Sciaenops ocellatus ) from the northern Gulf of Mexico (Gulf). The amount of genetic drift observed across temporally adjacent year classes (1986–89) was used to estimate variance effective (female) population size ( N ef ). N ef was estimated to be 14 308 and the ratio of female effective size to adult female census size was approximately 0.004, which is among the lowest value reported for vertebrate animals. Low effective size relative to census size among red drum in the northern Gulf may result from yearly fluctuations in the number of breeding females, high variance in female reproductive success, or both. Despite low genetic effective size relative to census size, the genetic effective population size of red drum in the northern Gulf appears sufficiently large to preclude potentially deleterious effects of inbreeding.