Clonal hybrids of the common laboratory fish Fundulus heteroclitus.

Dawley, Robert M.

doi:10.1073/pnas.89.6.2485

Cited by 50 publications

(45 citation statements)

References 25 publications

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“…But they may act as a supplier of unreduced diploid eggs, which give rise to triploid development after fertilization with sperm of bisexual diploids in nature. The production of such unreduced eggs by interspecific hybridization has been reported in teleosts including Salmo species (Johnson and Wright, 1986), Phoxinus species (Dawley et al, 1987;Dawley and Goddard, 1988;Goddard and Dawley, 1990), sunfish (Dawley et al, 1985;Dawley, 1987), medaka species (Sakaizumi et al, 1993;Kurita et al, 1995;Shimizu et al, 2000), and Fundulus species (Dawley, 1992). Similar results were also reported in Cnemidophorus in Reptiles (Dessauer and Cole, 1989;Moritz et al, 1989).…”

Section: Genetic Analyses In Diploid Progeny Of Females Mk3 Mk4 Andsupporting

confidence: 75%

Disruption of normal meiosis in artificial inter-populational hybrid females of Misgurnus loach

2008

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Artificial cross between two genetically different populations of JapaneseMisgurnus loach was made to examine the reproductive capacity of the artificial inter-populational hybrid females. Ploidy status and microsatellite genotypes of the eggs laid by these hybrids were inferred from those determined in progenies developed by normal fertilization with haploid loach sperm, induced gynogenesis with UV-irradiated goldfish sperm and/or hybridization with intact goldfish sperm. Some hybrid females laid unreduced diploid eggs genetically identical to the mother. However, these diploid eggs could not develop by spontaneous gynogenesis, but grow to triploid by incorporation of a sperm nucleus. Other hybrid females laid haploid eggs together with diploid eggs and/or various aneuploid and polyploid eggs. Thus, a disruption of normal meiosis occurred in inter-populational hybrid females. The results suggested that the two populations should be so distant as to give rise to atypical formation of unreduced and other unusual eggs in their hybrids.

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Section: Genetic Analyses In Diploid Progeny Of Females Mk3 Mk4 Andsupporting

confidence: 75%

Disruption of normal meiosis in artificial inter-populational hybrid females of Misgurnus loach

2008

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“…These differences may have arisen from selection acting on preexisting variability within F. heteroclitus or, possibly, from introgression of alleles from sympatric freshwater species (e.g. F. diaphanus; Dawley, 1992). Although the evolutionary pressures accounting for these differences in salinity tolerance are still uncertain, our data suggest that minimizing Climbalance was an essential evolutionary step allowing northern killifish to survive in freshwater.…”

Section: Possible Mechanisms Of Freshwater Adaptationmentioning

confidence: 78%

Intraspecific divergence of ionoregulatory physiology in the euryhaline teleostFundulus heteroclitus: possible mechanisms of freshwater adaptation

Scott

Rogers

Richards

et al. 2004

Journal of Experimental Biology

103

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The common killifish, Fundulus heteroclitus, inhabits brackish water estuaries and salt marshes along the eastern coast of North America. The species distribution is latitudinal, from Newfoundland to Florida, and thus spans a cline of environmental temperatures. Correspondingly, many previous studies have investigated thermal adaptations in populations across the range. Differences between populations include latitudinal differences in glycolytic enzyme expression and activity (Powers et al., 1986;Pierce and Crawford, 1996), endocrinology (DeKoning et al., 2004;Picard and Schulte, 2004), metabolism (Podrabsky et al., 2000), morphology and behaviour (Powers et al., 1993), and, as a result, these fish are sometimes divided into two subspecies, F.h. macrolepidotus (northern) and F.h. heteroclitus (southern). By contrast, few studies have assessed whether intraspecific physiological differences exist between populations of F. heteroclitus in response to other environmental factors (e.g. tidal cycle; DiMichele and Westerman, 1997).Species within the genus Fundulus are suggested to have arisen from brackish water ancestors, and there is substantial variation in both the salinity of their native habitats (ranging from freshwater to seawater) and their salinity tolerance (Griffith, 1974). Intraspecific differences in salinity tolerance and distribution also appear to exist within some Fundulus species. For example, northern populations of F. heteroclitus have higher fertilization success and larval survival in hyposmotic salinities than southern populations (Able and Palmer, 1988). Furthermore, the proportion of northern genotypes increases in freshwater habitats, even at latitudes and temperatures that are typical for the southern subspecies (Powers et al., 1993). It is therefore likely that molecular or physiological differences exist within F. heteroclitus that form the basis for variation in freshwater tolerance. We examined intraspecific variation in ionoregulatory physiology within euryhaline killifish, Fundulus heteroclitus, to understand possible mechanisms of freshwater adaptation in fish. Pronounced differences in freshwater tolerance existed between northern (2% mortality) and southern (19% mortality) killifish populations after transfer from brackish water (10·g·l -1 ) to freshwater. Differences in Na + regulation between each population might partially account for this difference in tolerance, because plasma Na + was decreased for a longer period in southern survivors than in northerns. Furthermore, northern fish increased Na + /K + -ATPase mRNA expression and activity in their gills to a greater extent 1-14·days after transfer than did southerns, which preceded higher whole-body net flux and unidirectional influx of Na + at 14·days. All observed differences in Na + regulation were small, however, and probably cannot account for the large differences in mortality. Differences in Cl -regulation also existed between populations. Plasma Cl -was maintained in northern fish, but in southerns, plasma Cl -decrease...

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“…Approximately 50 named species of sperm-dependent unisexual vertebrates have been described. Gynogenetic taxa can be found for example in livebearing fishes of the family Poeciliidae (25), silverside fishes in the family Atherinidae (26), several minnows in the family Cyprinidae (27), loach fishes in the family Cobitidae (28), some cyprinodontid killifishes (29), and mole salamanders in the family Ambystomatidae (30).…”

Section: Vertebrate Clonality Under Human Auspicesmentioning

confidence: 99%

Evolutionary perspectives on clonal reproduction in vertebrate animals

Avise

2015

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

100

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A synopsis is provided of different expressions of whole-animal vertebrate clonality (asexual organismal-level reproduction), both in the laboratory and in nature. For vertebrate taxa, such clonal phenomena include the following: human-mediated cloning via artificial nuclear transfer; intergenerational clonality in nature via parthenogenesis and gynogenesis; intergenerational hemiclonality via hybridogenesis and kleptogenesis; intragenerational clonality via polyembryony; and what in effect qualifies as clonal replication via self-fertilization and intense inbreeding by simultaneous hermaphrodites. Each of these clonal or quasi-clonal mechanisms is described, and its evolutionary genetic ramifications are addressed. By affording an atypical vantage on standard vertebrate reproduction, clonality offers fresh perspectives on the evolutionary and ecological significance of recombination-derived genetic variety.cloning | asexuality | unisexuality | parthenogenesis | polyembryony

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Clonal hybrids of the common laboratory fish Fundulus heteroclitus.

Cited by 50 publications

References 25 publications

Disruption of normal meiosis in artificial inter-populational hybrid females of Misgurnus loach

Disruption of normal meiosis in artificial inter-populational hybrid females of Misgurnus loach

Intraspecific divergence of ionoregulatory physiology in the euryhaline teleostFundulus heteroclitus: possible mechanisms of freshwater adaptation

Evolutionary perspectives on clonal reproduction in vertebrate animals

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