Endemism and dispersal: comparative phylogeography of three surgeonfishes across the Hawaiian Archipelago

Eble, Jeff A.; Toonen, Robert J.; Bowen, Brian W.

doi:10.1007/s00227-008-1119-4

Cited by 61 publications

(75 citation statements)

References 71 publications

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“…Given the low mtDNA diversity and low sample sizes at most locations, however, the conclusion of no population structure in S. mitsukurii from Hawaii must be regarded as provisional. Although a robust test of this conclusion would require larger sample sizes, the finding of no genetic structure is consistent with reef fish studies that show high connectivity across the Hawaiian Archipelago (Craig et al 2007, Eble et al 2009). Interestingly, the single specimen obtained from Gardner Pinnacles had the most divergent haplotype, 1.2% from the nearest related haplotype.…”

Section: Population Structuresupporting

confidence: 71%

Is multiple mating beneficial or unavoidable? Low multiple paternity and genetic diversity in the shortspine spurdog Squalus mitsukurii

Daly‐Engel

Grubbs²,

Feldheim³

et al. 2010

Mar. Ecol. Prog. Ser.

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Proposed benefits of multiple paternity include increased reproductive output, elevated fitness of progeny, and maintenance of population genetic diversity. However, another consideration is whether multiple paternity is simply an unavoidable byproduct of sexual conflict, with males seeking to maximize mating encounters while females seek to minimize the stress of copulation. Here we examined the polyandrous mating system in sharks, with a focus on the reproductive genetics of the shortspine spurdog Squalus mitsukurii. Members of the genus Squalus are long-lived, slow-growing, and employ among the longest gestation periods of any vertebrate. To evaluate multiple paternity and genetic diversity in S. mitsukurii, we genotyped 27 litters plus 96 individuals with 8 microsatellite loci. Further, 670 bp of the mtDNA control region were sequenced in 112 individuals to examine population structure. S. mitsukurii in Hawaii showed low genetic diversity relative to other sharks (π = 0.0010 ± 0.0008) and no significant population structure in the Hawaiian Archipelago. Direct allele counts and Bayesian approximations returned concordant estimates of 11% multiple paternity, the lowest observed in sharks to date. Considering the protracted reproductive interval of S. mitsukurii, sexual conflict that results from differential male and female reproductive strategies may favor the development of female mating avoidance behavior to minimize trauma. In S. mitsukurii this behavior includes segregation of sexes and an asynchronous reproductive cycle.KEY WORDS: Elasmobranch · Polyandry · Control region · Microsatellite DNA · Population structure · Sexual conflict · Sexual segregation · Reproductive strategy Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 403: [255][256][257][258][259][260][261][262][263][264][265][266][267] 2010 females with conventional sex roles (reviewed by Zeh & Zeh 2003). Polyandry (females mating with more than one male) and multiple paternity (a single brood of offspring sired by multiple males) are now recognized as common strategies in widely divergent taxa including amphibians, mammals, reptiles, insects, crustaceans, and fishes (Evans & Magurran 2000, Toonen 2004, Adams et al. 2005, Bretman & Tregenza 2005, Daly-Engel et al. 2006, Dean et al. 2006, Jensen et al. 2006. It is still unclear, however, what roles sexual conflict and intersexual selection might play in polyandrous mating systems.For males, the advantages to having multiple breeding partners are clear: the more females a male inseminates, the more offspring he fathers and the greater his reproductive fitness. The benefits of polyandry to females are less obvious. Potential direct benefits to the female include nuptial gifts or parental care on the part of the male. No direct benefits have been shown in shark mating systems, though there is potential for indirect or genetic benefits through polyandrous mating. If there is little or no opportunity to evaluate males prior to copulation, a f...

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Section: Population Structuresupporting

confidence: 71%

Is multiple mating beneficial or unavoidable? Low multiple paternity and genetic diversity in the shortspine spurdog Squalus mitsukurii

Daly‐Engel

Grubbs²,

Feldheim³

et al. 2010

Mar. Ecol. Prog. Ser.

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“…Here, all the possible results are seen in that the endemic species have greater, less and similar mitochondrial genetic diversity compared with the widespread species. This explains why the results of the two previously published studies-by Eble et al [17] and Hobbs et al [18]-contrast with one another. If the mitochondrial genetic diversity of only a few reef fish species are sampled and compared our results show that finding the mitochondrial genetic diversity of endemic species to be greater than widespread species is as likely as finding the opposite result.…”

Section: Resultsmentioning

confidence: 83%

Endemic and widespread coral reef fishes have similar mitochondrial genetic diversity

2014

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Endemic species are frequently assumed to have lower genetic diversity than species with large distributions, even if closely related. This assumption is based on research from the terrestrial environment and theoretical evolutionary modelling. We test this assumption in the marine environment by analysing the mitochondrial genetic diversity of 33 coral reef fish species from five families sampled from Pacific Ocean archipelagos. Surprisingly, haplotype and nucleotide diversity did not differ significantly between endemic and widespread species. The probable explanation is that the effective population size of some widespread fishes locally is similar to that of many of the endemics. Connectivity across parts of the distribution of the widespread species is probably low, so widespread species can operate like endemics at the extreme or isolated parts of their range. Mitochondrial genetic diversity of many endemic reef fish species may not either limit range size or be a source of vulnerability.

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“…However, the extent of temporal genetic homogeneity observed in samples from the same locations was not the same between the 1-yr and 10-yr temporal scales, with the latter bordering on statistically significant genetic structure in many cases (Table 3). Although the genetic differentiation be tween temporal scales is subtle, other genetic studies of fishes have suggested that small differences in F st can represent biologically important restrictions to gene flow rather than just noise in the data (Eble et al 2009, Knutsen et al 2011. In general, there are 2 factors that could account for temporal genetic structure: (1) Genetic drift.…”

Section: Spatial and Temporal Genetic Structure Of Polydactylus Macromentioning

confidence: 99%

Searching for common threads in threadfins: phylogeography of Australian polynemids in space and time

Horne¹,

Momigliano²,

Welch³

et al. 2012

Mar. Ecol. Prog. Ser.

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Proper management of marine fisheries requires an understanding of the spatial and temporal dynamics of marine populations, which can be obtained from genetic data. While numerous fisheries species have been surveyed for spatial genetic patterns, temporally sampled genetic data is not available for many species. We present a phylogeographic survey of the king threadfin Polydactylus macrochir across its species range in northern Australia and at a temporal scale of 1 and 10 yr. Spatially, the overall AMOVA fixation index was Φ st = 0.306 (F ' st = 0.838), p < 0.0001 and isolation by distance was strong and significant (r 2 = 0.45, p < 0.001). Temporally, genetic patterns were stable at a time scale of 10 yr. However, this did not hold true for samples from the eastern Gulf of Carpentaria, where populations showed a greater degree of temporal instability and lacked spatial genetic structure. Temporal but not spatial genetic structure in the Gulf indicates demographic interdependence but also indicates that fishing pressure may be high in this area. Generally, genetic patterns were similar to another co-distributed threadfin species Eleutheronema tetradactylum, which is ecologically similar. However, the historical demography of both species, evaluated herein, differed, with populations of P. macrochir being much younger. The data are consistent with an acute population bottleneck at the last glacio-eustatic low in sea level and indicate that the king threadfin may be sensitive to habitat disturbances.KEY WORDS: Australia · Pelagic larvae · Self-recruitment · Metapopulation · Genetic drift · Polydactylus macrochir Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 449: [263][264][265][266][267][268][269][270][271][272][273][274][275][276] 2012 conservation biology of marine organisms (Planes 2002, Cowen et al. 2007, Hellberg 2007, Jones et al. 2009). Yet, there are many logistical challenges to studying the movements of tiny oceanic larvae, including the extreme spatial scale at which dispersal can take place, and the complex influences of physical properties of the ocean on larval dispersal (Siegel et al. 2008, Cowen & Sponaugle 2009, which all but prevent direct observations of connectivity. Therefore, much of what we know about pelagic larval dispersal comes from indirect genetic approaches (Planes 2002, Hellberg et al. 2002, Hellberg 2007, Hedgecock et al. 2007, Jones et al. 2009, Leis et al. 2011.The delineation of fish stocks through genetic approaches, such as phylogeography and population genetics, is particularly important for the effectiveness of fisheries management and conservation strategies, provided that genetic patterns can be interpreted correctly (Waples 1998). While genetic data is highly sensitive to migration and the movement of genes between areas at some point in time, it often fails to indicate whether connectivity is demographically significant, i.e. it has a meaningful effect on the size and persistence of populations (Waples & Gag...

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Endemism and dispersal: comparative phylogeography of three surgeonfishes across the Hawaiian Archipelago

Cited by 61 publications

References 71 publications

Is multiple mating beneficial or unavoidable? Low multiple paternity and genetic diversity in the shortspine spurdog Squalus mitsukurii

Is multiple mating beneficial or unavoidable? Low multiple paternity and genetic diversity in the shortspine spurdog Squalus mitsukurii

Endemic and widespread coral reef fishes have similar mitochondrial genetic diversity

Searching for common threads in threadfins: phylogeography of Australian polynemids in space and time

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