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8 results for “Pyrenean desman”
Data from: Genomic diversity and geographical structure of the Pyrenean desman
<p>The Pyrenean desman (<em>Galemys pyrenaicus</em>) is a small semi-aquatic mammal endemic to the Iberian Peninsula. The species has recently experienced a strong decline and some of its populations are severely threatened with extinction. To help in the preservation of this species, it is critical to understand its genetic structure and main evolutionary units, as these may have specific local adaptations and could be of great conservation value. Sequencing reduced representation libraries (ddRAD) from 26 specimens selected from across its entire range, we obtained around 45,000 loci per specimen and 1185 single nucleotide polymorphisms. Heterozygosity varied substantially among individuals from different areas. Interestingly, specimens from the southeastern Pyrenees had some of the lowest proportions of heterozygous positions inferred from genome-wide data in mammals so far. In addition, we estimated a tree reflecting genomic divergence, performed a principal component analysis, and carried out a Bayesian analysis of the population structure. Combined evidence supported the existence of five distinct genomic clusters largely coincident with the main mountain ranges where the species occurs, with few specimens presenting relevant admixture levels. There was good correspondence between these populations and the mitochondrial lineages detected in a previous study, yet substantial differences in some areas demonstrate the importance of performing genomic analysis to reveal the whole population history. Although the analysis of further specimens is necessary to better characterize the distribution of the different evolutionary units, the distinctive geographical structure of this species revealed by the genomic data should be considered in future conservation plans.</p>
Data from: Genomic diversity and geographical structure of the Pyrenean desman
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Data from: Determining diet from faeces: selection of metabarcoding primers for the insectivore Pyrenean desman (Galemys pyrenaicus)
Molecular techniques allow non-invasive dietary studies from faeces, providing an invaluable tool to unveil ecological requirements of endangered or elusive species. They contribute to progress on important issues such as genomics, population genetics, dietary studies or reproductive analyses, essential knowledge for conservation biology. Nevertheless, these techniques require general methods to be tailored to the specific research objectives, as well as to substrate- and species-specific constraints. In this pilot study we test a range of available primers to optimise diet analysis from metabarcoding of faeces of a generalist aquatic insectivore, the endangered Pyrenean desman (Galemys pyrenaicus, É. Geoffroy Saint-Hilaire, 1811, Talpidae), as a step to improve the knowledge of the conservation biology of this species. Twenty-four faeces were collected in the field, DNA was extracted from them, and fragments of the standard barcode region (COI) were PCR amplified by using five primer sets (Brandon-Mong, Gillet, Leray, Meusnier and Zeale). PCR outputs were sequenced on the Illumina MiSeq platform, sequences were processed, clustered into OTUs (Operational Taxonomic Units) using UPARSE algorithm and BLASTed against the NCBI database. Although all primer sets successfully amplified their target fragments, they differed considerably in the amounts of sequence reads, rough OTUs, and taxonomically assigned OTUs. Primer sets consistently identified a few abundant prey taxa, probably representing the staple food of the Pyrenean desman. However, they differed in the less common prey groups. Overall, the combination of Gillet and Zeale primer sets were most cost-effective to identify the widest taxonomic range of prey as well as the desman itself, which could be further improved stepwise by adding sequentially the outputs of Leray, Brandon-Mong and Meusnier primers. These results are relevant for the conservation biology of this endangered species as they allow a better characterization of its food and habitat requirements.
On following pages: 6. Snow Mountain Shrew Mole (Uropsilus nivatus); 7. Black-backed Shrew Mole (Uropsilus atronates (Scapanus orarius); 11. Townsend's Mole (Scapanus townsendii); 12. Broad-footed Mole (Scapanus latimanus); 13 fusicauda); 16. Japanese Shrew Mole (Urotrichus talpoides); 17. True's Shrew Mole (Dymecodon pilirostris); 18. American (Desmana moschata); 21. Pyrenean Desman (Galemys pyrenaicus). ); 8. Gansu Mole (Scapanulus owen); 9. Hairy-tailed Mole (Parascalops breweri); 10. Coast Mole. Mexican Mole (Scapanus anthonyi); 14. Eastern Mole (Scalopus aquaticus); 15. Long-tailed Mole (Scaptonyx Shrew Mole (Neurotrichus gibbsii); 19. Starnosed Mole (Condylura cristata); 20. Russian Desman in Talpidae
On following pages: 6. Snow Mountain Shrew Mole (Uropsilus nivatus); 7. Black-backed Shrew Mole (Uropsilus atronates (Scapanus orarius); 11. Townsend's Mole (Scapanus townsendii); 12. Broad-footed Mole (Scapanus latimanus); 13 fusicauda); 16. Japanese Shrew Mole (Urotrichus talpoides); 17. True's Shrew Mole (Dymecodon pilirostris); 18. American (Desmana moschata); 21. Pyrenean Desman (Galemys pyrenaicus). ); 8. Gansu Mole (Scapanulus owen); 9. Hairy-tailed Mole (Parascalops breweri); 10. Coast Mole. Mexican Mole (Scapanus anthonyi); 14. Eastern Mole (Scalopus aquaticus); 15. Long-tailed Mole (Scaptonyx Shrew Mole (Neurotrichus gibbsii); 19. Starnosed Mole (Condylura cristata); 20. Russian Desman
Figure 2 in Local habitat preferences of a semi-aquatic mammal, the Pyrenean desman Galemys pyrenaicus
Figure 2: Explanatory power (% of deviance explained) of GLMs relating the number of Pyrenean desman faeces to a single category of abiotic or biotic variables ("models by category"). See Table 1 for details about the variables belonging to each category.
The genome of the Pyrenean desman and the effects of bottlenecks and inbreeding on the genomic landscape of an endangered species
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Data from: Determining diet from faeces: selection of metabarcoding primers for the insectivore Pyrenean desman (Galemys pyrenaicus)
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Figure 1 in Local habitat preferences of a semi-aquatic mammal, the Pyrenean desman Galemys pyrenaicus
Figure 1: Location of the study area and sampling sites (black dots) in the French Pyrenees.
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