995 resultados para 163-989B


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Apresenta dados estatísticos e quadros sinópticos das eleiçõs federais e estaduais no Brasil em 1962.

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Cyclopids, exactly in the same way as daphnids, significant component in the nutrition of plankton-f and the young of the majority of fishes. It is established that the food spectrum of cyclopids is extremely broad: daphnids, planarians, Copepodite stages of copepods (cannibalism), rotifers, protists, bacteria, phytoplankton and so on. It is clear that the problem of studying these or other components of feeding in the general food spectrum can be definitely resolved only after obtaining exact quantitative data on the feeding of cyclopids. This article attempts to fill the gap in the study of the quantitative side of the feeding of cyclopias; in it is investigated the size of the 24-hour ration of cyclopids feeding on protists, the dependence of the ration on some factors of the external medium, and the difference of 24-hour consumption per unit weight of tody with two species of cyclopids (Cyclops strenuus and Cyclops viridis).

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This paper tries to develop more generally some fundamental bases for the ecological study of freshwater plankton. A special attention is given to the phytoplankton associations which can be separated out and made into groups according to their dependence upon changing environments. Plankton formations in different types of water bodies (ponds, lakes and rivers) are studied.

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EXTRACT (SEE PDF FOR FULL ABSTRACT): Pollen from the upper 2.75 m of a core taken 200 km west of the Golfo de Guayaquil, Ecuador (Trident 163-13, 3° S, 84° W, 3,000 m water depth) documents changes in Andean vegetation and climate of the Cordillera Occidental for ~17,000 years before and after the last glacial maximum.

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O trabalho divulga os resultados do estudo agroambiental realizado nos espaços amazônicos, no médio Tapajós, tendo como centro a rodovia BR-163, diagnosticada quanto à sua natureza e potencialidades. O GEIPOT solicitou ao Núcleo, um estudo sobre a aptidão agrícola das terras para a cultura de soja e pecuária, com a finalidade de elaborar um planejamento racional e eficiente do uso das terras, dando enfoque à demanda por transporte originada no setor agrícola, minimizando os impactos causados ao meio ambiente.

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17 fotografías, dieciséis en tono de grises.