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- W4249763906 abstract "We used mitochondrial gene sequences to reconstruct phylogenetic relationships among subspecies of the bushmaster,Lachesis muta. These large vipers are widely distributed in lowland tropical forests in Central and South America, where three of four allopatric subspecies are separated by montane barriers. Our phylogeny indicates that the four subspecies belong to two clades, the Central American and South American lineages. We use published molecular studies of other taxa to estimate a «reptilian mtDNA rate» and thus temporal boundaries for major lineage divergences inLachesis. We estimate that the Central and South American forms diverged 18–6 Mya, perhaps due to the uplifting of the Andes, whereas the two Central American subspecies may have diverged 11–4 Mya with the uprising of the Cordillera de Talamanca that separates them today. South American bushmasters from the Amazon Basin and the Atlantic Forest are not strongly differentiated, perhaps due to episodic gene flow during the Pleistocene, when suitable habitat for this species was at times more continuous. Our results agree with previous evidence that genetic divergence among some neotropical vertebrates pre-dated Pleistocene forest fragmentation cycles and the appearance of the Panamanian Isthmus. Based on morphological, behavioral, and molecular evidence, we recognize three species ofLachesis. In addition toL. muta, the widespread South American form, the Central American forms are treated as distinct species (L. melanocephalaandL. stenophrys), each deserving of special conservation status due to restricted distribution and habitat destruction." @default.
- W4249763906 created "2022-05-12" @default.
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- W4249763906 date "1997-11-01" @default.
- W4249763906 modified "2023-10-10" @default.
- W4249763906 title "Phylogeography of the bushmaster (Lachesis muta: Viperidae): implications for neotropical biogeography, systematics, and conservation" @default.
- W4249763906 doi "https://doi.org/10.1006/bijl.1997.0162" @default.
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