IADIZA - GIB NOTICIAS
De Mendoza CONICET
(→Food habits and impact of rooting behaviour of the invasive wild boar, Sus scrofa, in a protected area of the Monte Desert, Argentina) |
(→Phylogeography and genetic variation in the South American rodent Tympanoctomys barrerae (Rodentia: Octodontidae)) |
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- | The red viscacha rat, Tympanoctomys barrerae, is an octodontid rodent endemic to the arid west-central and | + | The red viscacha rat, ''Tympanoctomys barrerae'', is an octodontid rodent endemic to the arid west-central and |
southern regions of Argentina[[http://www.cricyt.edu.ar/institutos/iadiza/ojeda/Respueadapta.htm]]. It is solitary, lives in complex burrows built in soft soil, and occurs at low | southern regions of Argentina[[http://www.cricyt.edu.ar/institutos/iadiza/ojeda/Respueadapta.htm]]. It is solitary, lives in complex burrows built in soft soil, and occurs at low | ||
population densities in patches associated with salt basins and sand dunes in lowland habitats of the Monte and | population densities in patches associated with salt basins and sand dunes in lowland habitats of the Monte and | ||
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inferred from phylogenetic analyses (maximum parsimony, Bayesian, and networks). Genetic structure and | inferred from phylogenetic analyses (maximum parsimony, Bayesian, and networks). Genetic structure and | ||
demographic history were analyzed with descriptive statistics, mismatch distributions, neutrality tests (Tajima’s | demographic history were analyzed with descriptive statistics, mismatch distributions, neutrality tests (Tajima’s | ||
- | and Fu’s), and analyses of molecular variance (AMOVAs). In total, 26 haplotypes were found, most restricted | + | and Fu’s), and analyses of molecular variance (AMOVAs). In total,''' 26 haplotypes were found, most restricted |
- | to single populations. The presence of unshared haplotypes was consistent with low migration rates. Within the | + | to single populations'''. The presence of '''unshared haplotypes was consistent with low migration rates'''. Within the |
- | distribution (between 29uS and 39uS) southern and northern populations showed higher genetic diversity values | + | distribution (between 29uS and 39uS) '''southern and northern populations showed higher genetic diversity values |
- | than central populations. Populations of T. barrerae showed moderate to high genetic differentiation on the | + | than central populations'''. Populations of T. barrerae showed moderate to high genetic differentiation on the |
basis of haplotypes of central populations. AMOVA analyses indicated a moderate level of geographic structure | basis of haplotypes of central populations. AMOVA analyses indicated a moderate level of geographic structure | ||
- | for all populations. Low haplotype and nucleotide diversities in central populations suggest a possible | + | for all populations. '''Low haplotype and nucleotide diversities in central populations suggest a possible |
- | bottleneck associated with Pleistocene glaciations or volcanic activity in this part of the range of the viscacha | + | bottleneck associated with Pleistocene glaciations or volcanic activity''' in this part of the range of the viscacha |
rat. Phylogeographic structure was moderate, and the analyses recovered 2 principal clades: A (with central and | rat. Phylogeographic structure was moderate, and the analyses recovered 2 principal clades: A (with central and | ||
- | a part of the southern distribution) and B (with northern and another part of the southern distribution). Most | + | a part of the southern distribution) and B (with northern and another part of the southern distribution). '''Most |
- | populations were polyphyletic, indicating that they have not been isolated long enough to reach reciprocal | + | populations were polyphyletic''', indicating that they have not been isolated long enough to reach reciprocal |
monophyly. Demographic analyses conducted for clades A and B suggest a recent history of population | monophyly. Demographic analyses conducted for clades A and B suggest a recent history of population | ||
expansion. (Agustina Ojeda[[http://personal.cricyt.edu.ar/agustinao/]], Journal of Mammalogy, 91(2):302–313, 2010) | expansion. (Agustina Ojeda[[http://personal.cricyt.edu.ar/agustinao/]], Journal of Mammalogy, 91(2):302–313, 2010) |
Revisión de 12:54 13 jul 2010
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Darwin y sus reflecciones sobre las especies exóticas “. . . few countries have undergone more remarkable changes since the year 1535, when the first colonist of La Plata landed with seventy-two horses. The countless herds of horses, cattle, and sheep, have altered the whole aspect of the vegetation, but they have almost banished the guanaco, deer, and ostrich. Numberless other changes must likewise have taken place; the wild pig in some parts probably replaces the pecarri; packs of wild dogs may be heard howling on the wooded banks of the less frequented stream; and the common cat, altered into a large and fierce animal, inhabits rocky hills….” Charles Darwin, The Voyage of the Beagle, entry for September 19th, 1833 |
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