Population Structure of Four Pupfish Species (Cyprinodontidae: Cyprinodon) from the Chihuahuan Desert Region of New Mexico and Texas: Allozymic Variation

Echelle, Anthony A.; Echelle, Alice F.; Edds, David R.

doi:10.2307/1445659

Cited by 38 publications

(45 citation statements)

References 12 publications

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“…D values obtained are greater than values exhibited by subspecies of Iberian cyprinids (Coelho 1992). Rogers' genetic distances exhibited by Atlantic and Mediterranean populations of A. iberus are higher than values reported in species of the closely related genus Cyprinodon (Echelle et al 1987). The high fixation index and genetic distance exhibited by Atlantic and Mediterranean populations of A. iberus suggest two well-differentiated groups which might merit a different subspecific level.…”

Section: Spatial Heterogeneitymentioning

confidence: 59%

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Allozymic variation of the endangered killifishAphanius iberus and its application to conservation

1996

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SynopsisGenetic differentiation and patterns of variability in the endangered Iberian endemic, Aphanius iberus, were analyzed by allozyme electrophoresis as a valuable database for conservation purposes. Genetic variability values expressed as heterozygosity (H = 0.015-0.097) were close to the values found in other members of Cyprinodontidae (H = 0.012-0.123). Polymorphism values (P = 0.125-0.542) were higher than reported in the literature (P = 0.036-0.150) for Cyprinodontidae. Significant correlation existed between salinity values and genetic variability expressed as heterozygosity (r = -0.76, p < 0.01) and polymorphism (r = -0.60, p = 0.04). Low genetic variability values (H = 0.024-0.055, P = 0.125-0.292) were exhibited by populations which inhabit salty lagoons. The highest values were found in populations occurring in marshes and irrigation channels (H = 0.051-0.097, P = 0.250-0.542). Associations among genetic, geographic and ecological parameters were tested using a Mantel test indicated that most of the genetic distances were explained by geographic distances but not by ecological factors, suggesting that isolation by distance could be the main factor explaining the differentiation between sites. According to the genetic distances obtained, two main A. iberus groups were discernible: the Atlantic and Mediterranean. Genetic distances between both groups (DRogers = 0.179-0.261) were higher than values between recognized species of other cyprinodontids (DRogers = 0.11-0.27). On the basis of genetic distances we have dated the fragmentation of both populations to the Upper Miocene-Pliocene when most of the Mediterranean sea dried up. Subsequently, gene flow between Mediterranean and Atlantic populations was interrupted. The results of our genetic analyses suggested the existence of five operational conservation units (OCUs) for A. iberus. These units are defined as a continuous area limited by geographical boundaries, and inhabited by one or more populations sharing the same genetic pattern.

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Section: Spatial Heterogeneitymentioning

confidence: 59%

“…a, b after Mpez Martinez 1989). Barrowclough 1983, 0.280 Zimmerman et al 1980, 0.427 Alves & Coelho 1994 (Echelle et al 1987). The heterozygote deficit could also be indicative of population subdivisions (Alves & Coelho 1994).…”

Section: Spatial Heterogeneitymentioning

confidence: 99%

Allozymic variation of the endangered killifishAphanius iberus and its application to conservation

1996

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“…There is a vast amount of literature on the population diVerentiation of killiWsh from the morphological, genetic and molecular points of view (e.g. Echelle et al 1987;Garciamarin et al 1990;Fernandez-Pedrosa et al 1995;Strecker et al 1996;Wilde and Echelle 1997;Duhan and Minckley 1998;Duvernell and Turner 1999;Echelle et al 2000;Perdices et al 2001;Torralva et al 2001;Reichenbacher and Sienknecht 2002;Doadrio et al 2002;Lussen et al 2003).…”

Section: Introductionmentioning

confidence: 99%

A study of osteological and molecular differences in populations of Aphanius fasciatus Nardo 1827, from the central Mediterranean (Teleostei, Cyprinodontidae)

et al. 2006

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Nine populations of Aphanius fasciatus Nardo, 1827 from the central Mediterranean were analysed by examining the mitochondrial control region and the morphology of the bony elements of the skull and vertebral column, to study the degree of intraspeciWc diVerentiation of A. fasciatus considering the level of isolation of the diVerent populations and the palaeogeographic history of the central Mediterranean area. Both the molecular and morphological analyses diVerentiate between the populations, even if the topologies of the two trees are diVerent. The molecular results show that the nine populations are characterised by haplotypes that are well deWned in relation to a probably limited gene Xow; while, as regards the morphological data the diVerentiation found could be explained in terms of the geographic isolation of the various populations, although the inXuence of environmental factors, which diVer greatly between the various sites where the populations live, cannot be ruled out.

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“…However, when allozymes and/or mtDNA were evaluated, most putative examples have been either strongly questioned or refuted (e.g., see refs. [10][11][12]. Clearly, morphological intermediacy alone is insufficient to adequately test hypotheses of hybrid origin.…”

mentioning

confidence: 99%

Origin of Gila seminuda (Teleostei: Cyprinidae) through introgressive hybridization: implications for evolution and conservation.

DeMarais

Dowling

Douglas

et al. 1992

Proc. Natl. Acad. Sci. U.S.A.

147

103

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Morphological and genetic characters from cyprinid fishes of the genus Gila were examined to assess a hypothesized hybrid origin of Gila seminuda from the Virgin River, Arizona-Nevada-Utah. The presumed parents, Gia robusta robusta and Gba elegans, are clearly differentiated from one another based on morphology, allozymes, and mtDNA haplotypes. G. seminuda is morphologically intermediate and polymorphic at allozyme loci diagnic for the parental species. Restriction endonuclease analysis of mtDNA showed G. seminuda nearly identical to G. elegans. These

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Population Structure of Four Pupfish Species (Cyprinodontidae: Cyprinodon) from the Chihuahuan Desert Region of New Mexico and Texas: Allozymic Variation

Cited by 38 publications

References 12 publications

Allozymic variation of the endangered killifishAphanius iberus and its application to conservation

Allozymic variation of the endangered killifishAphanius iberus and its application to conservation

A study of osteological and molecular differences in populations of Aphanius fasciatus Nardo 1827, from the central Mediterranean (Teleostei, Cyprinodontidae)

Origin of Gila seminuda (Teleostei: Cyprinidae) through introgressive hybridization: implications for evolution and conservation.

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