143 research outputs found
Genetica di popolazione di Archaeolacerta bedriagae (Reptilia, Lacertidae) e valutazioni tassonomiche
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Pelophilax bergeri (Gunther, In Engelmann, Fritzche, Gunther & Obs, 1986) - Pelophlax klepton hispanicus (Bonaparte, 1839)
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Interpreting dispersal patterns of reproductive female Hierophis viridiflavus (LACEPEDE, 1789), around a communal nesting site (Squamata: Serpentes: Colubridae)
No full textHow many Archaeolacerta inhabit the Corso-Sardinian Plate? Allozyme variation and differentiation in Archaeolacerta bedriagae (Camerano, 1885)
No full textArchaeolacerta bedriagae is a rock lizard endemic to Corsica and Sardinia. Four subspecies have been recozied
to date on the basis of morphological traits. Previous allozyme investigations revealed high genetic differentiation among
populations of the species. Based on these results some authors hypothesized that more than one species of Archaeolacerta
may occur on Corsica and Sardinia. In this paper we investigated allozyme variation at 19 gene loci in 5 populations belonging
to all subspecies of A. bedriagae in order to study genetic differentiation among populations from Corsica and Sardinia,
and to compare our results with those obtained in previous studies carried out on allozyme variation and taxonomy of the
species. Low levels of genetic differentiation (average Nei’s D = 0.026) and heterogeneity (mean FST = 0.147) were found
comparing the A. bedriagae populations, and there was no evidence of interruption or restriction of gene flow. This is in
agreement with the available molecular and morphometric data, while it is not in accordance with allozyme data reported in
the previous studies. Our data do not support the hypothesis of an unrecognized criptic species of Archaeolacerta in Corsica
and Sardinia, and indicate that the definitive assessment of the taxonomic status of the A. bedriagae populations requires
further investigation
Genetic divergence and phylogenetic inferences in five species of Mugilidae (Pisces : Perciformes)
No full textAllozyme electrophoresis was used to compare the genetic divergence of global populations of Mugil cephalus Linnaeus, 1758 and two congeneric [M. curema Cuvier & Valenciennes, 1836; M. gyrans (Jordan & Gilbert, 1855)] and two more distantly related [Liza ramada (Risso, 1826); Xenomugil thoburni (Jordan & Starks, 1896)] species on the basis of LS enzyme loci. The amount of genetic divergence among the species examined is in agreement with their present systematic status, the differences being larger among non-congeneric species than among species of the same genus. Intraspecific genetic distances in M. cephalus (average Nei's D = 0.154), although higher than those reported for conspecific populations of fish, appear to be small when compared to the interspecific values among mugilid species (0.821 less than or equal to Nei's D less than or equal to 1.744). Phylogenetic trees obtained by genetic distance methods and discrete character parsimony analysis were of similar topology, except for the relationships within the genus Mugil and for the arrangement of M. cephalus populations
Offspring condition determines dispersal patterns in western whip snakes, Hierophis viridiflavus
No full text"Dispersal patterns from a communal nesting\/birth site of hatchlings of the oviparous colubrid snake Hierophis viridiflavus were investigated using capture-mark-recapture data from a 17-year study. We found that hatchlings lighter at birth dispersed more than heavier ones, whereas after one year there was no difference in body mass between the individuals which rested close to their birth site and those which dispersed further. We interpret this result as an adaptive dispersal behaviour in which heavier newborn snakes are less inclined to disperse from the hatching site, whereas lighter snakes move further away to increase their foraging efficiency.
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