The major findings of this study were the consistency of
allele frequencies over time, sporadic differentiation among
neighbouring locations indicative of the effects of high
reproductive variance, and slight but significant differentiation
between the Gulf of Mexico and the Atlantic. We
observed high polymorphism and evidence of heterozygote
deficiencies at the microsatellite loci assayed. A biological
interpretation of the observed departure from HWE
was difficult because of null alleles, which we concluded
were present at least at Pse28 and Pse36 based on lack of
amplification at one locus only for an individual shrimp.
Deviations from HWE were found within loci and across
most samples, rather than within samples and across loci,
consistent with null alleles. The Wahlund effect could have
contributed to the observed heterozygote deficiency, and a
further test of this would require capturing and assaying
larval cohorts to look for discrete breeding groups (e.g.
Ruzzante et al. 1996; Li & Hedgecock 1998). With the white
shrimp data, it was difficult to tease apart the effects of null
alleles and sporadic local inbreeding.
The major findings of this study were the consistency of
allele frequencies over time, sporadic differentiation among
neighbouring locations indicative of the effects of high
reproductive variance, and slight but significant differentiation
between the Gulf of Mexico and the Atlantic. We
observed high polymorphism and evidence of heterozygote
deficiencies at the microsatellite loci assayed. A biological
interpretation of the observed departure from HWE
was difficult because of null alleles, which we concluded
were present at least at Pse28 and Pse36 based on lack of
amplification at one locus only for an individual shrimp.
Deviations from HWE were found within loci and across
most samples, rather than within samples and across loci,
consistent with null alleles. The Wahlund effect could have
contributed to the observed heterozygote deficiency, and a
further test of this would require capturing and assaying
larval cohorts to look for discrete breeding groups (e.g.
Ruzzante et al. 1996; Li & Hedgecock 1998). With the white
shrimp data, it was difficult to tease apart the effects of null
alleles and sporadic local inbreeding.
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