Relative importance of environment, human activity and spatial situation in determining the distribution of terrestrial mammal diversity in Argentina

We recorded the number of terrestrial mammal species in each Argentinian province, and the number of species belonging to particular groups (Marsupialia, Placentaria, and among the latter, Xenarthra, Carnivora, Ungulates and Rodentia). We performed multiple regressions of each group’s SR on environmental, human and spatial variables, to determine the amounts of variation explained by these factors. We then used a variance partitioning procedure to specify which proportion of the variation in SR is explained by each of the three factors exclusively and which proportions are attributable to interactions between factors.

Isolado de Grapevine rupestris stem pitting-associated virus causando necrose das nervuras da videira.

Grapevine rupestris stem pitting-associated virus (GRSPaV) está associado à virose das caneluras do tronco de Rupestris, é transmissível pela enxertia, não possui vetores conhecidos e forma o complexo do lenho rugoso da videira. A doença é responsável por incompatibilidade da enxertia, brotação tardia, declínio e até morte de plantas. O objetivo do trabalho foi comprovar a associação de uma estirpe específica do GRSPaV com sintomas de necrose de nervuras.