Size variation in the grapsid crab Aratus pisonii (H. Milne-Edwards, 1837) among populations of different subtropical mangroves

Size variation in the adult population of the grapsid crab Aratus pisonii (H. Milne-Edwards, 1837) was studied by comparing median values obtained from six different populations from nearby mangrove areas. The mangrove structure at those sites was also examined and related to size differences among populations. Disregarding sex, crab size is apparently related to the mangrove structure. Smallest and largest crab sizes were recorded at the sites where tree density and tree diameter were minimum and maximum, respectively. Estimates of size at the onset of maturity, considering the size of the smallest ovigerous female, followed the same trend. These results support the hypothesis that average crab size and size at the onset of maturity can be associated to mangrove productivity.

Thomas Mann: um escritor contra o nazismo

O combate que Thomas Mann travou contra o nazismo a partir de 1922 �� exemplar, pois �� o de um escritor apaixonado pela liberdade e n��o o de um militante. Ele privilegia a fic����o e o mito como meios de luta contra o fasc��nio exercido pelo nazismo e afirma a perman��ncia de uma Alemanha cultural, cosmopolita, fonte de uma universalidade estranha a todos os particularismos ��tnicos. Goethe, com quem ele se identifica e no qual se projeta, �� a figura de proa dessa Alemanha.

Feynman & Gell-Mann: Luzes, Quarks, A����o!

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)