Genetic variation in clonal vertebrates detected by simple-sequence DNA fingerprinting.

Bj, Turner; Elder, Jr Jf; Laughlin, Thomas F.; Davis, W.A.

doi:10.1073/pnas.87.15.5653

Cited by 126 publications

(109 citation statements)

References 12 publications

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“…Differences in low-temperature male induction as well as morphological anomalies among seven other clones from Florida to Brazil have also been observed (Turner 2003 1 ). In the field, Turner et al (1990Turner et al ( , 1992a used DNA fingerprinting to confirm both high levels of intrapopulation genetic heterogeneity and clonal variation in three Harrington-Kallman clones of Rivulus marmoratus. All of these studies demonstrate the high phenotypic and genetic variability of this species.…”

Section: Clonal Heterogeneity As An Adaptive Strategymentioning

confidence: 99%

Differences in life-history traits in two clonal strains of the self-fertilizing fish, Rivulus marmoratus

et al. 2005

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SynopsisWe compared life-history traits such as fecundity, sex ratio, reproductive cycle, age at sexual maturity, embryonic period, egg size, early growth and morphology in two clonal strains (PAN-RS and DAN) of the mangrove killifish (Rivulus marmoratus) under constant rearing conditions. We found a positive relationship between growth and reproductive effort. Fecundity was significantly higher in the PAN-RS strain than in the DAN strain. Sex ratio was significantly different, with DAN producing more primary males than PAN-RS. Spawning and ovulation cycle did not clearly differ between the strains. PAN-RS showed a significantly higher growth rate than DAN from 0 to 100 days after hatching, however, age at sexual maturity, embryonic period, egg size, and morphometric and meristic characteristics (vertebral and fin-ray counts) did not differ between the two strains. The high fecundity of PAN-RS may provide an increased chance of offspring survival, while the attainment of sexual maturity at a smaller size in DAN may allow them to invest earlier in reproduction to increase breeding success.Variations in the life-history traits of PAN-RS and DAN may be adaptive strategies for life in their natural habitat, which consists of mangrove estuaries with a highly variable environment. 2 IntroductionThe individual traits of organisms and their interaction with the environment define the dynamics of populations, the structure of ecological communities, and the functioning of ecosystems (Tessier et al. 2000). Identifying trends in life-history traits and interpreting the adaptiveness of such variation has always been a challenge for biologists (Stearns 1992). It is generally believed that observed differences in life-history traits result from genotypic variation and/or from the effect on a plastic phenotype of variation in the environment (Belk 1995). One of the most important issues in evolutionary biology is defining whether differences in life-history traits can be attributed to genetic or environmental variation.In the present study, we used two clonal strains of mangrove killifish (Rivulus marmoratus, Family Rivulidae) to identify differences in life-history traits and determine whether these variations are the result of genetic or environmental differences.The mangrove killifish is distributed from Southern Florida, U.S.A. to Brazil (Davis et al. 1990). It inhabits mangrove areas, which are exposed to alternate flooding and desiccation; thus, it is necessarily tolerant of a wide range of environmental conditions (Taylor 2000). There are three recognized sexual types: hermaphrodites, which have a marbled brownish color pattern usually including a caudal ocellus, and are capable of internal synchronous self-fertilization, and thus are capable of producing clonal lineages (Kallman & Harrington 1964, Harrington & Kallman 1968; primary males, which have an orange body coloration usually without caudal ocellus and remain male throughout their lives; and secondary males, which arise from hermaphrodites following the loss o...

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Section: Clonal Heterogeneity As An Adaptive Strategymentioning

confidence: 99%

Differences in life-history traits in two clonal strains of the self-fertilizing fish, Rivulus marmoratus

et al. 2005

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“…In gynogenesis, females produce unreduced eggs but need sperm from a closely related sexual species to trigger the onset of embryonic development. The sperm, however, does not fuse with the oocyte nucleus and the paternal genetic material does not contribute to the embryo (Hubbs & Hubbs 1932;Schartl et al 1990;Turner et al 1990). In very rare cases, however, this exclusion mechanism fails.…”

Section: Introductionmentioning

confidence: 99%

The origin and evolution of a unisexual hybrid:Poecilia formosa

Lampert

Schartl

2008

Phil. Trans. R. Soc. B

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Clonal reproduction in vertebrates can always be traced back to hybridization events as all known unisexual vertebrates are hybrids between recognized species or genetically defined races. Interestingly, clonal vertebrates often also rely on interspecific matings for their reproduction because gynogenesis (sperm-dependent parthenogenesis) and hybridogenesis are common modes of propagation. While in most cases these hybridization events leave no hereditary traces in the offspring, occasionally the genome exclusion mechanism fails and either small parts of male genetic material remain inside the oocyte in the form of microchromosomes, or fusion of the sperm nucleus with the oocyte nucleus leads to polyploid individuals. In this review, we highlight the important role of hybridization for the origin and evolution of a unisexual hybrid: the Amazon molly, Poecilia formosa.

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“…Population did not exert a significant effect (F135 = 0.18, P 0.6735) and accounted for less than 1 per cent of the total variation. The interaction between gel and population was not significant (F335 = 1.05, aphids (Carvalho et al, 1991); clonal vertebrates Fragment length (kb) (Turner et a!., 1990) and blackberries and raspberries (Nybom & Schaal, 1990)]. In all these cases, diagnostic minisatellite bands are associated with high levels of band sharing within populations or clones.…”

Section: Comparison Of Band-sharing Coefficientsmentioning

confidence: 93%

“…Nybom & Schaal, 1990;Turner et al, 1990;Carvatho et a!., 1991. ), founder effects and/or inbreeding (Gilbert et al, 1990).…”

mentioning

confidence: 99%

Population-specific DNA fingerprints in a neotropical pseudoscorpion (Cordylochernes scorpioides)

Zeh

Coffroth

et al. 1992

Heredity

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Genetic variation in clonal vertebrates detected by simple-sequence DNA fingerprinting.

Abstract: The measurement of clonal heterogeneity is central to understanding the evolutionary and population genetics of the roughly 50 species of vertebrates that lack effective genetic recombination.

Cited by 126 publications

References 12 publications

Differences in life-history traits in two clonal strains of the self-fertilizing fish, Rivulus marmoratus

Differences in life-history traits in two clonal strains of the self-fertilizing fish, Rivulus marmoratus

The origin and evolution of a unisexual hybrid:Poecilia formosa

Population-specific DNA fingerprints in a neotropical pseudoscorpion (Cordylochernes scorpioides)

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