Estimating anisotropic pollen dispersal: a case study in Quercus lobata

Article Abstract:

A method is described for detecting anisotropy of pollen dispersal and of gauging its intensity in Quercus lobata, which is based on the estimation of the differentiation of maternal pollen clouds (TwoGener extraction), assuming that pollen dispersal is bivariate and normally distributed. This method has helped in detecting anisotropy in pollen dispersal in natural populations and has indicated the need for greater replication, both within and among mothers.

Oak, Oaks, Pollination

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Partial selfing, ecological disturbance and reproductive assurance in an invasive freshwater snail

Article Abstract:

The mating system of freshwater snail Physa acuta is studied, wherein the availability of mating partners is highly variable as the species is an efficient colonizer occupying unstable habitats. Explanations for negative results are discussed in light of arguments supporting the reproductive assurance hypothesis in Physa acuta along with alternative theories explaining the occurrence of partial selfing, as either a genetically fixed or plastic trait.

United States, Sexual behavior, Sexual selection in animals, Sexual selection (Natural selection), Animal reproduction, Snails

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Gene flow, historical population dynamics and genetic diversity within French Guianan populations of a rainforest tree species, Vouacapoua americana

Article Abstract:

A study on distribution of genetic diversity of 17 populations of Vouacapoua americana (Caesalpiniaceae) in French Guiana, using nine micro satellite loci, is presented. It is found that gene flow explains nuclear spatial genetic structure of V. americana at the geographic scale of French Guiana better than historical events.

United Kingdom, Evaluation, Biological diversity, Biodiversity, Gene flow, Americana

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