Noninvasive molecular tracking of colonizing wolf (Canis lupus) packs in the western Italian Alps
Identifieur interne : 000B52 ( Main/Exploration ); précédent : 000B51; suivant : 000B53Noninvasive molecular tracking of colonizing wolf (Canis lupus) packs in the western Italian Alps
Auteurs : V. Lucchini ; E. Fabbri ; F. Marucco ; S. Ricci ; L. Boitani [Italie] ; E. Randi [Italie]Source :
- Molecular Ecology [ 0962-1083 ] ; 2002-05.
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Abstract
We used noninvasive methods to obtain genetic and demographic data on the wolf packs (Canis lupus), which are now recolonizing the Alps, a century after their eradication. DNA samples, extracted from presumed wolf scats collected in the western Italian Alps (Piemonte), were genotyped to determine species and sex by sequencing parts of the mitochondrial DNA (mtDNA) control‐region and ZFX/ZFY genes. Individual genotypes were identified by multilocus microsatellite analyses using a multiple tubes polymerase chain reaction (PCR). The performance of the laboratory protocols was affected by the age of samples. The quality of excremental DNA extracts was higher in samples freshly collected on snow in winter than in samples that were older or collected during summer. Preliminary mtDNA screening of all samples allowed species identification and was a good predictor of further PCR performances. Wolf, and not prey, DNA targets were preferentially amplified. Allelic dropout occurred more frequently than false alleles, but the probability of false homozygote determinations was always < 0.001. A panel of six to nine microsatellites would allow identification of individual wolf genotypes, also whether related, with a probability of identity of < 0.015. Genealogical relationships among individuals could be determined reliably if the number of candidate parents was 6–8, and most of them had been sampled and correctly genotyped. Genetic data indicate that colonizing Alpine wolves originate exclusively from the Italian source population and retain a high proportion of its genetic diversity. Spatial and temporal locations of individual genotypes, and kinship analyses, suggest that two distinct packs of closely related wolves, plus some unrelated individuals, ranged in the study areas. This is in agreement with field observations.
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DOI: 10.1046/j.1365-294X.2002.01489.x
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DNA samples, extracted from presumed wolf scats collected in the western Italian Alps (Piemonte), were genotyped to determine species and sex by sequencing parts of the mitochondrial DNA (mtDNA) control‐region and ZFX/ZFY genes. Individual genotypes were identified by multilocus microsatellite analyses using a multiple tubes polymerase chain reaction (PCR). The performance of the laboratory protocols was affected by the age of samples. The quality of excremental DNA extracts was higher in samples freshly collected on snow in winter than in samples that were older or collected during summer. Preliminary mtDNA screening of all samples allowed species identification and was a good predictor of further PCR performances. Wolf, and not prey, DNA targets were preferentially amplified. Allelic dropout occurred more frequently than false alleles, but the probability of false homozygote determinations was always < 0.001. A panel of six to nine microsatellites would allow identification of individual wolf genotypes, also whether related, with a probability of identity of < 0.015. Genealogical relationships among individuals could be determined reliably if the number of candidate parents was 6–8, and most of them had been sampled and correctly genotyped. Genetic data indicate that colonizing Alpine wolves originate exclusively from the Italian source population and retain a high proportion of its genetic diversity. Spatial and temporal locations of individual genotypes, and kinship analyses, suggest that two distinct packs of closely related wolves, plus some unrelated individuals, ranged in the study areas. This is in agreement with field observations.</div></front></TEI><affiliations><list><country><li>Italie</li></country><region><li>Latium</li></region><settlement><li>Rome</li></settlement></list><tree><noCountry><name sortKey="Fabbri, E" sort="Fabbri, E" uniqKey="Fabbri E" first="E." last="Fabbri">E. Fabbri</name><name sortKey="Lucchini, V" sort="Lucchini, V" uniqKey="Lucchini V" first="V." last="Lucchini">V. Lucchini</name><name sortKey="Marucco, F" sort="Marucco, F" uniqKey="Marucco F" first="F." last="Marucco">F. Marucco</name><name sortKey="Ricci, S" sort="Ricci, S" uniqKey="Ricci S" first="S." last="Ricci">S. Ricci</name></noCountry><country name="Italie"><region name="Latium"><name sortKey="Boitani, L" sort="Boitani, L" uniqKey="Boitani L" first="L." last="Boitani">L. Boitani</name></region><name sortKey="Randi, E" sort="Randi, E" uniqKey="Randi E" first="E." last="Randi">E. Randi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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