Genetic diversity, but not hatching success, is jointly affected by postglacial colonization and isolation in the threatened frog, Rana latastei
Articolo
Data di Pubblicazione:
2007
Citazione:
Genetic diversity, but not hatching success, is jointly affected by postglacial colonization and isolation in the threatened frog, Rana latastei / G.F. Ficetola, T.W.J. Garner, F. De Bernardi. - In: MOLECULAR ECOLOGY. - ISSN 0962-1083. - 16:9(2007), pp. 1787-1797. [10.1111/j.1365-294X.2006.03198.x]
Abstract:
Both postglacial colonization and habitat fragmentation can reduce the genetic diversity
of populations, which in turn can affect fitness. However, since these processes occur at
different spatial and temporal scales, the consequences of either process may differ.
To disentangle the relative role of isolation and postglacial colonization in determining
genetic diversity and fitness, we studied microsatellite diversity of 295 individuals from
10 populations and measured the hatch rate of 218 clutches from eight populations of
a threatened frog, R. latastei. The populations that were affected by fragmentation to a
greater extent suffered higher embryo mortality and reduced hatch rate, while no effects of
distance from glacial refugium on hatch rate were detected. Altogether, distance from
glacial refugium and isolation explained > 90% of variation in genetic diversity. We found
that the genetic diversity was lowest in populations both isolated and far from the glacial
refugium, and that distance from refugium seems to have the primary role in determining
genetic diversity. The relationship between genetic diversity and hatch rate was not
significant. However, the proportion of genetic diversity lost through recent isolation had
a significant, negative effect on fitness. It is possible that selection at least partially purged
the negative effects of the ancestral loss of genetic diversity.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Embryo mortality; Genetic diversity; Hatch rate; Inbreeding depression; Landscape fragmentation; Road density
Elenco autori:
G.F. Ficetola, T.W.J. Garner, F. De Bernardi
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