| Titre : | The genetic effects of forest fragmentation on five species of Amazonian birds |
| Auteurs : | J. M. Bates, Auteur |
| Type de document : | Article |
| Dans : | Journal of Avian Biology (33(3) SEP 2002) |
| Article en page(s) : | 276-294 |
| Langues: | Anglais |
| Résumé : | Restriction fragment length polymorphisms of mtDNA were used to assess genetic structure at two geographic scales for five species of Neotropical forest-understory birds. At the local scale (in northeastern Bolivia), I studied populations of each species from six sites within 200 kin of one another. At this scale, I studied the effects of forest fragmentation on mtDNA genetic structure: three sites were in natural forest fragments separated by cerrado (savanna), and three sites were in continuous forest. Genetic variation did not appear to have be-en lost in the forest fragment populations of any species, However, for three antbirds (Thamnophilidae), patterns of haplotype distributions suggest fragmentation affected genetic structure in an unusual way. For these species, numerically dominant haplotypes in forest fragments did not occur in continuous forest, v whereas predominant haplotypes in continuous forest are widespread (occurring in fragments and continuous forest). These results suggest that forest fragmentation on a local geographic scale can affect genetic differentiation even in birds, a group that is considered to disperse well, The two other taxa studied were a woodcreeper (Dendrocolaptidae) and a tyrant-flycatcher (Tyrannidae). These two taxa did not show genetic effects of forest fragmentation, but they possessed notably different numbers of haplotypes per total individuals surveyed. The woodcreeper had few haplotypes (5 in 58 individuals), whereas the flycatcher had many (31 in |
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