Artigo da hora demais! Duas partes da discussão me chamaram a atenção: Rhabdomys males are reported to harbour more P. arvicanthis individuals than females, possibly as a result of testosterone-mediated immune depression. Because solitary roaming Rhabdomys males have the highest reported levels of testosterone, we propose that these individuals may be predominantly responsible for facilitating the high levels of Polyplax dispersal across the geographic landscape. If these arguments hold, our findings strongly support the premise that host life history characteristics (social behaviour and mobility) are equally important in shaping parasite population structure and determining the extent of genealogical congruence. e Cladogenesis and ecological divergence within Rhabdomys likely occurred as a result of biogeographic changes in response to climatic and landscape changes around the Mio-Pliocene boundary and subsequent climatic oscillations may have led to range expansion–contraction cycles. It thus seems reasonable to suggest that biogeographic changes would have also significantly shaped the patterns of genetic divergence within P. arvicanthis. The occurrence of codivergence, duplication, sorting and host-switching events in association with particular host lineages is probably best explained by stochasticity coupled to the relative abundance of parasite lineages, as parasite abundance determines the likelihood of tracking host movements. goo.gl/aUXJrq
Posted on: Sat, 27 Dec 2014 19:04:24 +0000
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