Genetic differentiation of bicolor damselfish (Eupomacentrus partitus) populations in the Florida Keys

Lacson, J. M.; Riccardi, Vincent M.; Calhoun, Stuart W.; Morizot, Donald C.

doi:10.1007/bf00399576

Cited by 28 publications

(14 citation statements)

References 25 publications

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“…Lacson (1992) found no genetic structure across the entire Caribbean using allozyme markers and OspinaGuerrero et al (2008) found similar results using microsatellite markers in the Colombian-Caribbean. However, other studies found genetic heterogeneity among populations of S. partitus in the Florida Keys (Lacson et al 1989), but the differentiation was attributed to population bottlenecks (Lacson & Morizot 1991). Furthermore, recent microsatellite analyses showed weak population structuring within the Caribbean Antilles (Purcell et al 2009), the Bahamas (Christie et al 2010) and within the western Caribbean (Salas et al 2009).…”

Section: Discussionmentioning

confidence: 97%

“…S. partitus is a demersally spawning damselfish common throughout the Caribbean with a larval duration of approximately 30 d. It thus has a moderate to high dispersal capacity and is expected to show limited or no spatial genetic structure. Genetic structure and stability of S. partitus populations has been assessed using variable allozyme markers, and both fine-scale population structuring and temporal instability were demonstrated (Lacson et al 1989, Lacson & Morizot 1991. However, this population structuring was driven by a single allozyme locus that appeared to be under selection and structuring was attributed to a previous bottleneck event (Lacson & Morizot 1991).…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

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Variability in connectivity indicated by chaotic genetic patchiness within and among populations of a marine fish

Hogan¹,

Thiessen²,

Heath³

2010

Mar. Ecol. Prog. Ser.

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Despite substantial advances in our understanding of marine population dynamics, there is still much uncertainty as to what processes influence connectivity, gene flow and population structure. To explore this, we examined the spatial and temporal variation in population genetic structure of adult and recently settled bicolor damselfish Stegastes partitus, a coral reef fish. We genotyped adult and juvenile fish from 10 sites over 4 sample years at 9 microsatellite loci. We show spatial heterogeneity in adult and juvenile population structure; however, we found no evidence of a pattern of spatial genetic divergence. Furthermore, genetic structure changed through time and between life stages in an unpredictable manner. Using these data, we test whether pre-or postsettlement selection, sweepstakes effects or variability in connectivity can explain the observed chaotic genetic patchiness. Our results indicate that the contributions of various larval sources likely change through time as a result of stochastic processes such as oceanographic flow. Our results have implications for the management of marine populations, as spatial and temporal variability in connectivity may act to promote long term stability of populations. Therefore it is important that marine management efforts account for such heterogeneity in the design of protected areas.KEY WORDS: Connectivity · Temporal variability · Larval dispersal · Chaotic genetic patchiness · Genetic structure · Coral reef fish Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 417: [263][264][265][266][267][268][269][270][271][272][273][274][275] 2010 through time and space (Larson & Julian 1999). This fine-scale genetic heterogeneity, termed chaotic genetic patchiness (Johnson & Black 1982), is characterized by low level genetic differentiation among and between adult and recruit populations (i.e. low F ST ) that is not consistent in space or time (Johnson & Black 1984).There are 4 main hypotheses put forth to explain chaotic genetic patchiness (Larson & Julian 1999); each infers a different mechanism by which this pattern can be explained. These hypotheses are (1) localized postsettlement selection resulting from microgeographic variation in environmental conditions, (2) variable local natural selection on pre-settlement individuals generating variability in cohorts through space and time, (3) 'sweepstakes chance-matching' (Hedgecock 1994) created by variable reproductive success of the adult source populations as a result of stochastic processes. This causes a genetic drift effect during the larval stage and a subsequent reduction in genetic variability in the recruit populations, and (4) spatial and temporal variability in the genetic composition of recruits caused by fluctuations in the source of larvae (Selkoe et al. 2006).Post-settlement natural selection has been invoked to explain spatial genetic heterogeneity in a marine snail (Johannesson et al. 1995). Generally, however, most studies have shown that gen...

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Section: Discussionmentioning

confidence: 97%

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Variability in connectivity indicated by chaotic genetic patchiness within and among populations of a marine fish

Hogan¹,

Thiessen²,

Heath³

2010

Mar. Ecol. Prog. Ser.

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“…Evidence obtained from mathematical models based on predictions about circulation, larval transport (Schultz and Cowen 1994, Cowen et al 2000, and larval behavior (Paris and Cowen 2004) supports the idea of populations with little dispersion (closed populations), while studies using allozymes suggest that the species has high gene flow (open populations) and a common genetic background with high dispersion (Lacson et al 1989, Lacson and Morrizot 1991, Lacson 1992.…”

Section: Introductionmentioning

confidence: 98%

Genetic connectivity of Stegastes partitus in the South Caribbean evidenced by microsatellite analysis

et al. 2008

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Bicolor damselfish Stegastes partitus (Poey 1986) has been used as a model for studies of the population structure of reef species as an aid for the designing and monitoring of marine protected areas. Studies using allozymes have shown gene flow between populations, but it has been suggested that the lack of structuring could be a consequence of the insensitivity of these markers. We used 11 polymorphic microsatellite loci to evaluate the genetic connectivity of 299 bicolor damselfish from four representative areas of the Colombian coast in the South Caribbean (Santa Marta, Rosario Islands, Capurganá, and San Andrés Island). Genotyping was made using detection by fluorescence of multiple alleles. Genetic differentiation among geographic populations and different oceanographic scenarios was analyzed using the statistic Φ ST and analysis of molecular variance. The correlation between genetic and geographic distance was explored using the Mantel test. All loci were polymorphic, and showed a high number of alleles per locus and heterozygosity deficit with a consequent departure from Hardy-Weinberg equilibrium. We found evidence of gene flow between the geographic and oceanographic populations examined and a lack of correlation between the genetic and geographic distances. The information obtained can be used by the agencies responsible for the design and conservation of marine protected areas and as reference in the monitoring of the genetic diversity and structure of the population under study.

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“…004-0.035, Lacson 1992). On the same geographic scale, an allozyme survey of the damselfish Stegastes partitus showed no significant population structure (Lacson 1992;Lacson et al 1989). The lack of divergence between distant localities is usually attributed to egg and larval dispersal over hundreds or several thousand kilometers (see Johannes 1978;Brothers and Thresher 1985), a mechanism invoked to explain the presence of reef fish species on isolated islands (e.g., Allen and Robertson 1997;Robertson 2001).…”

Section: Introductionmentioning

confidence: 99%

Ancient divergences and recent connections in two tropical Atlantic reef fishes Epinephelus adscensionis and Rypticus saponaceous (Percoidei: Serranidae)

2003

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Reef habitats of the tropical Atlantic are separated by river outflows and oceanic expanses that may preclude larval dispersal or other population connections in shorefishes. To examine the impact of these habitat discontinuities on the intraspecific phylogeography of reef-associated species we conducted range-wide surveys of two amphi-Atlantic reef fishes that have dispersive pelagic larval stages. Based on 593 bp of mtDNA cytochrome b from the rock hind Epinephelus adscensionis and 682 bp from the greater soapfish Rypticus saponaceous (n=109 and 86, respectively), we found evidence of relatively ancient separations as well as recent surmounting of biogeographic barriers by dispersal or colonization. Rock hind showed slight but significant population genetic differentiation across much of the tropical Atlantic Ocean (F ST =0.056), but deep divergence between the southeastern United States and seven other localities from the Bahamas to the south, central and east Atlantic (mean pairwise d=0.040, overall F ST =0.867). The geographic distribution of the two rock hind lineages is highly unusual in genetic studies of Caribbean Sea reef fishes, because those lineages are separated by less than 250 km of open water within a major biogeographic region. In contrast, highly significant population genetic structure was observed among greater soapfish from the SW Caribbean, Brazil, and mid-Atlantic ridge (F ST =0.372), with a deep evolutionary separation distinguishing putative R. saponaceous from West Africa (mean pairwise d=0.044, overall F ST =0.929). Both species show evidence for a potential connection between the Caribbean and Brazilian provinces. While widespread haplotype sharing in rock hind indicates that larvae of this species cross oceanic expanses of as much as 2000 km, such a situation is difficult to reconcile with the isolation of populations in Florida and the Bahamas separated by only 250 km. These findings indicate that populations of some species in disjunct biogeographic zones may be isolated for long periods, perhaps sufficient for allopatric speciation, but rare gene flow between zones may preclude such evolutionary divergence in other species.

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Genetic differentiation of bicolor damselfish (Eupomacentrus partitus) populations in the Florida Keys

Cited by 28 publications

References 25 publications

Variability in connectivity indicated by chaotic genetic patchiness within and among populations of a marine fish

Variability in connectivity indicated by chaotic genetic patchiness within and among populations of a marine fish

Genetic connectivity of Stegastes partitus in the South Caribbean evidenced by microsatellite analysis

Ancient divergences and recent connections in two tropical Atlantic reef fishes Epinephelus adscensionis and Rypticus saponaceous (Percoidei: Serranidae)

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