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6 results for “Triturus cristatus”
Data from: Scale-dependent effects of terrestrial habitat on genetic variation in the great crested newt (Triturus cristatus)
<p><b>Context</b></p> <p class="CxSpMiddle">Terrestrial landscapes surrounding aquatic habitat influence the persistence of amphibian spatially structured populations (SSPs) via their crucial role in providing estivation and overwintering sites, facilitating or hampering dispersal and colonisation, and consequently the maintenance or loss of genetic diversity.</p> <p><b>Objectives</b></p> <p class="CxSpMiddle">To highlight the landscape drivers of genetic variation, we investigated the relationship between the level of genetic variation measured within ponds of the great crested newt (<i>Triturus cristatus</i>), and the composition of the surrounding landscape at various spatial scales.</p> <p><b>Methods</b></p> <p class="CxSpMiddle">Based on the sampling of 40 ponds in thirteen SSPs, the influence of landscape features on several estimators of genetic variation was investigated via linear mixed models, with effects within and between SSPs incorporated.</p> <p><b>Results</b></p> <p class="CxSpMiddle">The best models depended on the spatial scale, with more significant associations within radii of 50 and 100 m of core ponds, particularly for allelic richness. Responses within and between SSPs were mostly similar. The availability of aquatic habitat in the landscape had a positive effect, while woodland, arable land and pasture had different effects depending on scale and response variable. Total length of roads within a 250 m radius influenced effective population size negatively.</p> <p><b>Conclusions</b></p> <p class="CxSpMiddle">Our results stress the need to investigate the influence of environmental predictors at multiple spatial scales for an adequate understanding of ongoing processes. Generally, the landscape affected genetic variation similarly within and between SSPs. This allowed us to provide general guidelines for the persistence of great crested newt populations, with an emphasis on the importance of the aquatic habitat.</p>
Data for: An experimental assessment of detection dog ability to locate great crested newts (Triturus cristatus) at a channeled distance and through soil
<p>Detection dogs are increasingly used to locate cryptic wildlife species, but their use for amphibians is still rather underexplored. In the present paper we focus on the great crested newts (<em>Triturus cristatus</em>), a European species which is experiencing high conservation concerns across its range, and assess the ability of a trained detection dog to locate individuals during their terrestrial phase. More specifically, we used a series of randomised, double-blinded experiments to document whether a range of distances between target newts and the detection dog affects the ability of localisation, and to assess the ability and efficiency of target newt detection in simulated subterranean refugia through 20 cm of two common soil types (clay and sandy soil, both with and without air vents to mimic mammal burrows, a common refuge used by <em>T. cristatus</em>). The detection dog accurately located all individual <em>T. cristatus</em> across the entire range of tested distances (25 cm - 2 m). The substrate trials revealed that the detection dog could locate individuals also through soil. As expected, the detection time during the soil discrimination trials was significantly reduced for treatments with vents. Contrary to existing studies with detection dogs in human forensic contexts, however, detection was generally faster for <em>T. cristatus</em> under clay soil compared to sandy soil. Our study provides a general baseline for the use of detection dogs in locating <em>T. cristatus</em> and similar amphibian species during their terrestrial phase. </p>
Data from: Scale-dependent effects of terrestrial habitat on genetic variation in the great crested newt (Triturus cristatus)
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Data from: The crested newt Triturus cristatus recolonized temperate Eurasia from an extra-Mediterranean glacial refugium
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Data for: An experimental assessment of detection dog ability to locate great crested newts (Triturus cristatus) at a channeled distance and through soil
Open the record for dataset details and reuse information.
Figure 1 in Interspecific differences in early life-history traits in crested newts (Triturus cristatus superspecies, Caudata, Salamandridae) from the Balkan Peninsula
Figure 1. Larval growth rate of four Triturus species.
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