Genetic structure of Mediterranean chukar (Alectoris chukar, Galliformes) populations as inferred by mitochondrial and microsatellite DNA markers: suggestions for their conservation.
Notice bibliographique
Résumé
The chukar (Alectoris chukar, Galliformes) is a widespread, stantial game bird whose native distribution ranges from Greece and southeastern Bulgaria across mountainous areas of Middle East throughout central Asia until Manchuria, China. The chukar has been successfully introduced into North America (Canada and USA, Hawaii included), South Africa and New Zealand. Although most of the native chukar populations are not decreasing in their effective size, the survival of isolated groups is strongly threatened by genetically uncontrolled translocations for hunting purposes. Our study aimed to determine the genetic structure of the chukar populations colonizing a few Greek islands in the Aegean Sea such as, from north to south, Limnos, Lesvos, Chios and Crete as well as the Island of Cyprus. The final goal of this work was to provide useful information to game bird managers to bring the commercial exchange of Mediterranean chukar partridges into line with knowledge of their genetic kinship. A total of 143 samples (hunted birds: liver; captive birds: feathers) were collected. Particularly, they were obtained from wild partridges of Limnos (n = 22), Lesvos (n = 20), Chios (n = 21) and Crete (n = 27). From the last one some samples (n = 5) were also obtained from captive birds of “Game farm of Forest Service of Rethymno”. Finally, 48 samples were collected in Cyprus (12, from the only government farm; 24, from two wild geographically separated populations of the territory of the Republic; 12, from the Turkish-occupied part of the island). In order to determine whether genetically isolated groups do exist and need to be managed as distinct Management Units (MUs), the evolutionary relationships among populations were inferred by means of both mitochondrial (mtDNA) and microsatellite DNA markers. Two mtDNA segments were amplified by Polymerase Chain Reaction (PCR) and then directly sequenced on both strands for each specimen: the Cytochrome-b (Cyt-b) gene and the Control Region (CR) (2248 characters per specimen, total). A genetic comparison with a very large number of Asian and US introduced conspecific specimens: n = 118; feathers, blood, liver and scats; from 17 countries) was performed. Furthermore, eight microsatellite DNA loci originally isolated from either chicken (Gallus gallus, Wageningen University, The Netherlands: MCW 104, MCW 121, MCW 146, MCW 276, MCW 295) or red-legged partridge genome (A. rufa: Aru 1.23, Aru 1.27, Aru 1.29) were investigated only for the above-mentioned Greek and Cypriot chukars. Phylogenetic reconstructions (Neighbor-Joining, Maximum Parsimony, Maximum-Likelihood) obtained using Cyt-b + CR joined sequences showed that Greek and Cypriot populations all belong to a very large clade including Mediterranean, Middle East and Central Asian samples, which was clearly separated from a second clade to whom chukars from far East Asia as well as introduced US populations were assigned. A few Greek specimens (n = 13: from Crete, Lesvos and Chios) were included in the second clade suggesting their maternal origin from translocated specimens. Particularly, four out of five specimens from Cretan farm were assigned to the East Asia clade. The analysis of the population structure by means of microsatellite and mtDNA markers (Analysis of Molecular Variance, Fst, Bayesian inference, Principal Component Analysis, Factorial Correspondence Analysis) allowed suggesting that each island hosts a genetically isolated group. In Cyprus, two genetically isolated groups were found: the first, comprehending just the Turkish-occupied area’s population, and the second comprehending all of the others three populations, with low level of gene flow between them. These results suggest the existence of genetically (and, for Cyprus, also demographically) isolated populations that, in the absence of ecological data, should be treated as separate MUs. A wider genetic survey on Greek chukar farms is suggested to assess the level of admixture between native and allochthonous animals in order to establish genetically homogeneous reference stocks.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».