This could be because host-use divergence drives speciation, or because it raises the ecological limits on species richness. To evaluate these hypotheses, we performed phylogenetic path model analyses of the species diversity of Nearctic aphids. Here, we show that variation in the species richness ...
However, in recent years, the predictive applicability of pollination syndromes has been frequently questioned. The accuracy of the syndromes among the closely related plant species may vary temporally and spatially. This suggests the need for the standardized, comprehensive evaluation of factors ...
The geographic isolation of a population can result in the rise of a new species. ● ● ● Answer Choices ○ Isolation can result when a geographic barrier forms and splits a population or when a few organisms somehow get carried across an existing geographic barrier and form a new population...
ForPachydactylusand its relatives, two variable traits of interest that may promote geographic isolation are body size and habitat preference. There is substantial body size variation inPachydactylusand related genera, with the largest and smallest species having adult snout–vent lengths of 35 and 1...
In the formation of many species, the initial isolation of a population seems to have been a geographic barrier. This mode of evolving new species is called allopatric speciation.Many factors can isolate a population geographically. A mountain range may emerge and gradually split a population of ...
Isolation of soil dermatophytes from three distinct geographic locations in JordanDermatophytesDesertHair baitIsolationJordanMountainsSoilValleysDue to the unique geography of Jordan, which comprises mountains, valleys and desert terrains, the isolation of dermatophytes from soils derived from these ...
(all of the genes in a population at any one time) from other populations of the same species, thereby preventing population interbreeding. With its gene pool isolated, a separate population can follow its own evolutionary course. In the formation of many species, the initial isolation of a ...
suggests pikas across their range may experience metapopulation dynamics albeit at very different temporal and spatial scales, which in turn may result in differing genetic signals. Metapopulation dynamics may therefore partially explain the low genetic diversity observed in pika populations found in the ...
Overall, our results indicate that geographic isolation, and potentially other factors such as shallow water habitats to rest and socialise, may be important drivers of the genetic population structure of insular spinner dolphins in this region. 展开 ...
in the genus Mimulus. Variation in the distribution models showed that these species differ significantly in the niches they occupy. These differences result in substantial ecogeographic isolation, with an average strength of 0.67, revealing that, on average, Mimulus species exhibit only 33% overlap ...