Influência biogeográfica na morfologia de diásporos

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Island Biogeography focuses on island species considering evolutionary aspects subject to patterns of isolation, rates of immigration and extinction, environmental standards, such as soil, predation rate and colonization. This work aims to compare morphologically diaspores of Guapira pernambucensis (Casar.) Lund., Schinus terebinthifolius Rad. and Canavalia rosea (Sw.) DC., occurring on the island and the mainland of Environmental Protection Area of Setiba, Guarapari, Espírito Santo State. The diaspores were collected, measured and weighed in order to verify possible variations due to their insular isolation It was found that the size of the diaspores of Guapira pernambucensis (Casar.) Lund. and Schinus terebinthifolius Rad. occurring on the island are larger than the continental diaspores. To explain this variation two possibilities were raised, the first is that individuals accompanied the insular evolutionary trend, and second, the variation was caused by ecological reasons in the insular environment. Canavalia rosea (Sw.) DC., on the other hand, presented larger diaspores in the continental environment. To explain this variation two other possibilities were raised, the first is that perhaps the species have not inhabit the island long enough so that insular evolutionary trend would be accompanied; or the soil variation on the insular environment was also caused by ecological reasons.