Distribution and habitat use of water frog hybrid complexes in France

Pagano, A.; Crochet, Pierre André; Graf, Jean-Daniel; Joly, Pierre; Lodé, Thierry

doi:10.1046/j.1466-822x.2001.00246.x

Cited by 45 publications

(66 citation statements)

References 28 publications

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“…For R. perezi, incorporation of foreign alleles counteracts the loss of genetic variability due to founder effects, as can be seen at the high levels of heterozygosity in Camarguean populations. Owing to the high competitiveness of R. ridibunda in freshwater habitats (Pagano et al 2001), the ecological niche of R. perezi in the Camargue seems to Table 1. Location of sites and population composition.…”

Section: Discussionmentioning

confidence: 99%

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Crossing species' range borders: interspecies gene exchange mediated by hybridogenesis

et al. 2005

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The distribution of species is limited by their ability to adapt to local environments. For adaptation by selection, genetic variability is crucial. As founder effects reduce genetic variability, extension of species' range borders is usually slow due to the reduced probability of successful colonization. However, the range limit might be extended by incorporating locally adapted genes. In western Palaearctic waterfrogs, interspecies hybrids show hemiclonal gametogenesis, are fertile and reproductively mimic one parental species. Genetic analysis, using allozyme loci, shows that they mediate gene exchange between the two parental species. Selection analysis provides evidence for local adaptation of single locus genotypes. This suggests that hybridogenesis presents a process which increases the number of neoform parental genotypes, exposing these to selection, and thereby revealing locally adapted genotypes which are essential for species range expansion.

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Section: Discussionmentioning

confidence: 99%

“…We defined eight clusters involving all our reference samples. Species of other taxa might have been sampled by accident, as R. esculenta and R. lessonae frequently occur in habitats in the mid-Rhô ne floodplains (Pagano et al 2001). Further, we know little of the exact distribution range of R. bergeri, R. hispanica and R. saharica.…”

Section: Methodsmentioning

confidence: 99%

Crossing species' range borders: interspecies gene exchange mediated by hybridogenesis

et al. 2005

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“…The plots y ϭ Ϫ1.38x ϩ 20.79 (R 2 ϭ 0.68); y ϭ Ϫ0.05x ϩ 6.78 (R 2 ϭ 0.88); and y ϭ Ϫ0.06x ϩ 7.65 (R 2 ϭ 0.41) represent the best fits to the ice accumulation rate vs. the body mass in R. lessonae, R. ridibunda, and R. esculenta, respectively. the region where the frogs were caught, mixed assemblages of R. esculenta and R. lessonae occupy shallow eutrophicated ponds, whereas R. ridibunda is mainly found in rivers and lakes (32). As a correlate, these taxa are also considered as differing in their wintering habits.…”

Section: Discussionmentioning

confidence: 99%

“…The maintenance of the complex supposes something like a "sexual parasitism" by hybrid females that preferentially mate with parental lessonae males, thus restoring hybridity (21). Within this assemblage, the habitat preference of each species has been well studied (23,30,32). R. ridibunda preferentially inhabits well-oxygenated waters (often lakes, rivers, and dead arms near rivers), whereas the two other species are found in shallow ponds.…”

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Freezing tolerance of the European water frogs: the good, the bad, and the ugly

Voituron¹,

Joly²,

Eugène³

et al. 2005

American Journal of Physiology-Regulatory, Integrative and Comp

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Survival and some physiological responses to freezing were investigated in three European water frogs ( Rana lessonae, Rana ridibunda, and their hybridogen Rana esculenta). The three species exhibited different survival times during freezing (from 10 h for R. lessonae to 20 h for R. ridibunda). The time courses of percent water frozen were similar; however, because of the huge differences in body mass among species (from 10 g for Rana lessonae to nearly 100 g for Rana ridibunda), the ice mass accumulation rate varied markedly (from 0.75 ± 0.12 to 1.43 ± 0.11 g ice/h, respectively) and was lowest in the terrestrial hibernator Rana lessonae. The hybrid Rana esculenta exhibited an intermediate response between the two parental species; furthermore, within-species correlation existed between body mass and ice mass accumulation rates, suggesting the occurrence of subpopulations in this species (0.84 ± 0.08 g ice/h for small R. esculenta and 1.78 ± 0.09 g ice/h for large ones). Biochemical analyses showed accumulation of blood glucose and lactate, liver glucose (originating from glycogen), and liver alanine in Rana lessonae and Rana esculenta but not in Rana ridibunda in response to freezing. The variation of freeze tolerance between these three closely related species could bring understanding to the physiological processes involved in the evolution of freeze tolerance in vertebrates.

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“…Although these three species are very close relatives, they strongly differ in their habitat use. For instance, the marsh frog exhibits a clear preference for habitats influenced by rivers (dead arms and gravel-pits) whereas R. lessonae and R. esculenta are rare or absent from these habitats (Pagano et al, 2001). Furthermore, whilst R. ridibunda overwinters under water, R. esculenta, and R. lessonae hibernate in woodland 3-7 cm below the surface of the soil, under moss, fallen leaves and small branches (Berger '82;Holenweg and Reyer, 2000).…”

Section: Discussionmentioning

confidence: 99%

Survival and metabolic responses to freezing by the water frog (Rana ridibunda)

Voituron¹,

Eugène²,

Barré³

2003

J. Exp. Zool.

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We studied the ability of the marsh frog Rana ridibunda to survive freezing exposure and the associated subsequent metabolic variations. This species that typically overwinters under water tolerates the conversion of 55% of its body water into ice. This ice content is attained after a few hours (between 8 and 36 hours depending on the mass of the individual and the environmental temperature) but death occurs at greater than 58% ice. Freezing stimulated a significant increase in blood carnitine and trimethylamine levels (respectively 4.5+/-2.5 and 0.5+/-0.2 micromol.l(-1) for controls versus 27.0+/-18.9 and 3.6+/-4.1 micromol.l(-1) after thawing) but these increases had no significant effect on plasma osmolality which was unchanged between control and freeze exposed frogs (252.6+/-20.3 versus 240.2+/-25.0 mOsmol.l(-1), respectively). Freezing also induced a significant dehydration of heart, liver and muscles (respectively 4.2, 3.2 and 2.8%) but the observed levels are low compared to values found in highly freeze tolerant species. This species could be classified as "partially freeze tolerant" enduring the transformation of a significant part of its body water into ice but not the completion of the exotherm. The existence of freeze tolerance in an aquatic hibernator that does not accumulate cryoprotectant, exhibiting low organ dehydration after freezing and low hypoxia tolerance, raises the possibility that a tolerance of nearly 60% ice within the body is common among anurans.

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Distribution and habitat use of water frog hybrid complexes in France

Cited by 45 publications

References 28 publications

Crossing species' range borders: interspecies gene exchange mediated by hybridogenesis

Crossing species' range borders: interspecies gene exchange mediated by hybridogenesis

Freezing tolerance of the European water frogs: the good, the bad, and the ugly

Survival and metabolic responses to freezing by the water frog (Rana ridibunda)

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