Combined analyses of kinship and F<inf>ST</inf> suggest potential drivers of chaotic genetic patchiness in high gene-flow populations

Matthew Iacchei, Tal Ben-Horin, Kimberly A. Selkoe, Christopher E. Bird, Francisco J. García-Rodríguez, Robert J. Toonen

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Abstract

We combine kinship estimates with traditional F-statistics to explain contemporary drivers of population genetic differentiation despite high gene flow. We investigate range-wide population genetic structure of the California spiny (or red rock) lobster (Panulirus interruptus) and find slight, but significant global population differentiation in mtDNA (ΦST = 0.006, P = 0.001; Dest-Chao = 0.025) and seven nuclear microsatellites (FST = 0.004, P < 0.001; Dest-Chao = 0.03), despite the species' 240- to 330-day pelagic larval duration. Significant population structure does not correlate with distance between sampling locations, and pairwise FST between adjacent sites often exceeds that among geographically distant locations. This result would typically be interpreted as unexplainable, chaotic genetic patchiness. However, kinship levels differ significantly among sites (pseudo-F16,988 = 1.39, P = 0.001), and ten of 17 sample sites have significantly greater numbers of kin than expected by chance (P < 0.05). Moreover, a higher proportion of kin within sites strongly correlates with greater genetic differentiation among sites (Dest-Chao, R2 = 0.66, P < 0.005). Sites with elevated mean kinship were geographically proximate to regions of high upwelling intensity (R2 = 0.41, P = 0.0009). These results indicate that P. interruptus does not maintain a single homogenous population, despite extreme dispersal potential. Instead, these lobsters appear to either have substantial localized recruitment or maintain planktonic larval cohesiveness whereby siblings more likely settle together than disperse across sites. More broadly, our results contribute to a growing number of studies showing that low F ST and high family structure across populations can coexist, illuminating the foundations of cryptic genetic patterns and the nature of marine dispersal. © 2013 John Wiley & Sons Ltd.
Original languageAmerican English
Pages (from-to)3476-3494
Number of pages3126
JournalMolecular Ecology
DOIs
StatePublished - 1 Jul 2013
Externally publishedYes

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Gene Flow
kinship
patchiness
Panulirus interruptus
gene flow
lobster
lobsters
genetic differentiation
population genetics
Population Genetics
Population
family structure
genetic variation
Palinuridae
cohesion
genetic structure
population structure
Genetic Structures
upwelling
mitochondrial DNA

Cite this

Iacchei, Matthew ; Ben-Horin, Tal ; Selkoe, Kimberly A. ; Bird, Christopher E. ; García-Rodríguez, Francisco J. ; Toonen, Robert J. / Combined analyses of kinship and F<inf>ST</inf> suggest potential drivers of chaotic genetic patchiness in high gene-flow populations. In: Molecular Ecology. 2013 ; pp. 3476-3494.
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abstract = "We combine kinship estimates with traditional F-statistics to explain contemporary drivers of population genetic differentiation despite high gene flow. We investigate range-wide population genetic structure of the California spiny (or red rock) lobster (Panulirus interruptus) and find slight, but significant global population differentiation in mtDNA (ΦST = 0.006, P = 0.001; Dest-Chao = 0.025) and seven nuclear microsatellites (FST = 0.004, P < 0.001; Dest-Chao = 0.03), despite the species' 240- to 330-day pelagic larval duration. Significant population structure does not correlate with distance between sampling locations, and pairwise FST between adjacent sites often exceeds that among geographically distant locations. This result would typically be interpreted as unexplainable, chaotic genetic patchiness. However, kinship levels differ significantly among sites (pseudo-F16,988 = 1.39, P = 0.001), and ten of 17 sample sites have significantly greater numbers of kin than expected by chance (P < 0.05). Moreover, a higher proportion of kin within sites strongly correlates with greater genetic differentiation among sites (Dest-Chao, R2 = 0.66, P < 0.005). Sites with elevated mean kinship were geographically proximate to regions of high upwelling intensity (R2 = 0.41, P = 0.0009). These results indicate that P. interruptus does not maintain a single homogenous population, despite extreme dispersal potential. Instead, these lobsters appear to either have substantial localized recruitment or maintain planktonic larval cohesiveness whereby siblings more likely settle together than disperse across sites. More broadly, our results contribute to a growing number of studies showing that low F ST and high family structure across populations can coexist, illuminating the foundations of cryptic genetic patterns and the nature of marine dispersal. {\circledC} 2013 John Wiley & Sons Ltd.",
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Combined analyses of kinship and F<inf>ST</inf> suggest potential drivers of chaotic genetic patchiness in high gene-flow populations. / Iacchei, Matthew; Ben-Horin, Tal; Selkoe, Kimberly A.; Bird, Christopher E.; García-Rodríguez, Francisco J.; Toonen, Robert J.

In: Molecular Ecology, 01.07.2013, p. 3476-3494.

Research output: Contribution to journalArticle

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