Vertical migration during tidal transport of megalopae of Necora puber in coastal shallow waters during daytime

For meroplanktonic larvae that must settle in coastal areas, their successful return to the shore is determined largely by physical transport processes; however, many organisms perform vertical movements to aid successful recruitment. In this study, daytime tidal vertical migration of megalopae of the velvet swimming crab Necora puber was investigated across two different exposures in the shallow waters of Plymouth Sound. Crabs were collected using a plankton net at the surface and near the bottom during flood and ebb tides. Distribution of the pelagic postlarvae was patchy and the abundance varied spatially in tens and thousands of metres. In temporal scales, the annual pattern was dominated by low occurrence of megalopae, punctuated by episodic peaks of high abundance. Most megalopae were collected at the surface irrespective of the tidal phase. The effect of wave exposure on the vertical migration of megalopae was not clear, although there was a general higher abundance of megalopae on exposed shores. Daytime abundance in the water column appears to be regulated by the tidal cycle, as megalopae were more abundant during flood than ebb tides. Although the megalopae do not appear to make large vertical migrations, this behaviour should produce a net shoreward transport. © 2005 Elsevier Ltd. All rights reserved.

Estimativa da umidade de um solo de várzea sob duas condições de drenagem e subirrigação

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Sobre Villiers de l'Isle-Adam e seus contos cruéis

Villiers de l’Isle-Adam (1838-1889) is always remembered and admired for his books: Contes cruels, L’Ève future and Claire Lenoir- which summarize the main worries of the writer, his satire of the triumphant Positivism, his metaphysical theory and his aspiration for the Ideal. He is one of the greatest artisans of the French literature style of the XIX century and, in spite of some individual and particular characteristics, he shares with other writers from his time – Joris-Karl Huysmans, Barbey d’Aurevilly, Leon Bloy, among others – the same sorrow and fury towards Positivism and Mercantilism. Having as a starting point the collection Contes cruels, the purpose of this article is to reveal the author’s writings who, by searching for the Ideal and by taking refuge in art, is able to unite the poet, the ironic and the idealist philosopher. Through his writings, the writer moves away from the world’s mediocrity and can express a mix of revolt, reaction, rebellion and also, his hopes expressed in his beliefs in the “Au-delà” and in the salvation by the Ideal.