Studies on an Isolated Spawning Population of the Brook Lamprey (Lampetra planeri)

Hardisty, M. W.

doi:10.2307/2302

Cited by 26 publications

(9 citation statements)

References 17 publications

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“…Overlapping of breeding cohorts in a given population promotes the vertical exchange of genetic material within the population, and may act to maintain genetic variation (Hardisty, 1961;Schreiber & Engelhorn, 1998). Fluctuating selection can readily maintain genetic variance in species where generations overlap in such a way that only a fraction of the population is exposed to selection (Chesson, 1985;Ellner & Hairston, 1994;Ellner & Sasaki, 1996), thus, as generation overlap increases, a given level of environmental variation becomes more effective in maintaining genetic variability (Ellner & Hairston, 1994).…”

Section: Genetic Diversitymentioning

confidence: 99%

Genetic diversity of Mexican brook lamprey Lampetra (Tetrapleurodon) geminis (Alvarez del Villar, 1966)

Mejía¹,

Polaco²,

Zúñiga³

2004

Genetica

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Lampreys are the only surviving representatives of the oldest known vertebrates. The Mexican lamprey L. geminis (nonparasitic), is particularly interesting, because it is an endemic, biogeographical relict, and a threatened species. RAPD markers were used to describe genetic diversity in L. geminis. A total of 77 specimens were collected from five populations, three in the Río Grande de Morelia-Cuitzeo basin and two in the Río Duero-Lerma-Chapala basin, México. Eighty-eight RAPD markers were obtained from eight primers. Genetic diversity within each population was estimated using Shannon's index (S), heterozygosity (H) and gene diversity (h). These estimates revealed significant variation within populations, although a variance homogeneity test (HOMOVA) showed no significant differences among populations or between basins. Nei genetic distance values indicate a low genetic differentiation among populations. Analysis of molecular variance (AMOVA) indicates that most of the genetic diversity occurs within populations (91.4%), but that a statistically significant amount is found among populations (P < 0.001). Principal coordinates and cluster analyses of RAPD phenotypes show that specimens are not grouped by geographical origin. The genetic diversity found within L. geminis populations may be explained by its breeding system and an overlapping of generations. The scarce genetic differentiation among populations is likely to the low rate of DNA change that characterizes the lamprey group.

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Section: Genetic Diversitymentioning

confidence: 99%

Genetic diversity of Mexican brook lamprey Lampetra (Tetrapleurodon) geminis (Alvarez del Villar, 1966)

Mejía¹,

Polaco²,

Zúñiga³

2004

Genetica

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“…More recently Holmes (1990) fitted mathematical models to data from Piavis (1961) and McCauley (1963) relating time to hatch and temperature. Although a number of studies have described the influence of temperature on the timing of spawning in several lamprey species (Hardisty, 1944(Hardisty, , 1961Applegate, 1950;Hagelin & Steffner, 1958;Manion & McLain, 1971;Malmqvist, 1980;Sjö berg, 1980), quantitative data on how temperature affects survival rates and time for embryo development are sparsely documented (Piavis, 1961(Piavis, , 1971Langille & Hall, 1988;Holmes, 1990). Therefore, a primary objective of this study was to examine the effects of temperature on embryonic survival, developmental rate, and body size and condition at the onset of exogenous feeding.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature on developmental performance, survival and growth of sea lamprey embryos

Rodríguez‐Muñcoz

Nicieza

Braña

2001

Journal of Fish Biology

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This study assesses the influence of thermal regime on the development, survival rates and early growth of embryos of sea lamprey Petromyzon marinus incubated at five constant temperatures (7, 11, 15, 19 and 23 C). The time from fertilization to 50% hatching and from hatching to 50% burrowing were inversely related to incubation temperature. All the embryos incubated at 7 C died at very early stages, while those maintained at 11 C did not attain the burrowing stage. Survival from fertilization to hatching was 61, 89, 91 and 89% at 11, 15, 19 and 23 C, decreasing to 58, 70 and 70% from hatching to burrowing at 15, 19 and 23 C, respectively. Larvae reared during the first 3 months of exogenous feeding in a common environment at constant 21 C, revealed maximum survival for an incubation temperature of 15 C (43% of burrowed larvae) decreasing strongly at 19 C (16%) and 23 C (one suvivor among 240 larvae). Body length at the burrowing stage was maximum for embryos incubated at 19 C, but body mass increased in the interval 15-23 C. Mean incubation temperatures experienced by 117 broods during the embryonic development in the source river were estimated in 15·3 2·30 C and 16·7 1·76 C (mean 1 ..) for the periods fertilization-to-hatching and hatching-toburrowing, respectively. 2001 The Fisheries Society of the British Isles

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“…In the present study, there was a clear bias towards males among spawning least brook lampreys and, relative to the larval sex ratios, this excess of males was not consistent. Hardisty (1960) found a similar disparity between larval and adult sex ratios, which he has attributed to higher female mortality at some time between metamorphosis and spawning (Hardisty 1961b). Alternatively, it could be that the disproportionate percentage of males at spawning was artifactual, due either to small samples sizes or to the time or location of collection.…”

Section: Streammentioning

confidence: 88%

“…Alternatively, it could be that the disproportionate percentage of males at spawning was artifactual, due either to small samples sizes or to the time or location of collection. Lamprey sex ratios, for example, have been shown to fluctuate during the spawning season (Zanandrea 1951, Hardisty 1961b, Stier & Kynard 1986, and may be attributed either to differential migration rates between the sexes (Applegate & Thomas 1965) or shorter female residence time on the spawning grounds (Farlinger & Beamish 1984). A better understanding of the relationship between larva and adult sex ratios is crucial to further hypotheses regarding the evolutionary significance of environmental sex determination in lampreys.…”

Section: Streammentioning

confidence: 99%

Age, growth, and sex ratio among populations of least brook lamprey,Lampetra aepyptera, larvae: an argument for environmental sex determination

1994

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SynopsisSex ratios of least brook lamprey, Lampetra aepyptera, larvae varied widely among 12 geographically-diverse streams of the eastern United States. The extremes were 29 and 71% male, and the proportion of males increased significantly with relative population density, which was estimated among the streams from the number of larvae collected per m2 of substrate. The skewed sex ratios were not likely due to differential mortality between the sexes or differential recruitment to the adult stock, since they were established at the time of gonadal differentiation (at ca. 2 years of age) and remained relatively constant over the subsequent 2-3 years of larval life. Furthermore, although females seemed to predominate in the oldest larval age class, thus appearing to metamorphose later than males, their numbers were small and were omitted from the overall sex ratio. Sex ratio did not vary significantly with water hardness, pH, annual thermal units, or latitude. The possible adaptive significance of density-dependent sex determination in lampreys, however, remains elusive. It has been proposed that growth-promoting conditions might yield female-biased sex ratios as a tactic for ensuring that relatively large individuals become females, thereby increasing their fecundity. As predicted, larval size at a given age was generally greater in low-density populations, but there was no relationship between sex ratio and larval size, and female larvae were not consistently larger than the males.

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Studies on an Isolated Spawning Population of the Brook Lamprey (Lampetra planeri)

Cited by 26 publications

References 17 publications

Genetic diversity of Mexican brook lamprey Lampetra (Tetrapleurodon) geminis (Alvarez del Villar, 1966)

Genetic diversity of Mexican brook lamprey Lampetra (Tetrapleurodon) geminis (Alvarez del Villar, 1966)

Effects of temperature on developmental performance, survival and growth of sea lamprey embryos

Age, growth, and sex ratio among populations of least brook lamprey,Lampetra aepyptera, larvae: an argument for environmental sex determination

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