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| Registros recuperados: 2.039 | |
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| Mees, C. C.. |
| The results of a census of fishing boats on Mahe Praslin and La Digue are presented in total 439 active fishing boats were counted of which 156 were pirogues, 196 were outboards, 68 were whalers and 19 were schooners. The details are discussed in relation to the catch assessment survey conducted by Seychelles fishing Authority. An evaluation of historical data follows. the number of pirogues and outboards increased up to 1986 and declined thereafter. The number of whalers steadily increased since1985 whilst the number of schooners has not changed significantly. It is argued that the changes in boat numbers are a results of interactions between the available near shore and offshore resources, the development of commercial opportunities through the... |
| Tipo: Report |
Palavras-chave: Artisanal fishing; Boats; Fishing vessels statistics. |
| Ano: 1989 |
URL: http://hdl.handle.net/1834/5116 |
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| Barbosa,Maria Regina de Vasconcellos; Peixoto,Ariane Luna. |
| RESUMOO gênero Simira está representado na Amazônia brasileira por oito espécies: S. pisoniiformis, S. macrocrater, S. corumbensis, S. tinctoria, S. hadrantha, S. rubescens, S. paraensis e uma nova espécie descrita para o Mato Grosso, S. pilosa. Dessas, S. rubescens é a que apresenta maior dispersão sendo frequente na Amazônia brasileira, venezuelana e peruana. S. pisoniiformis ocorre na Amazônia brasileira e venezuelana, encontrando-se, porém, uma população disjunta no sul da Bahia. S. hadrantha, conhecida apenas para o Peru, é citada pela primeira vez para o Brasil. Os caracteres taxonômicos de maior significância para a identificação das espécies são a prefloração e pilosidade da carola, número de pares de nervuras secundárias nas folhas e consistência... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1989 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671989000100027 |
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| Chiriguaya, J.. |
| Las ondas internas son movimientos ondulatorios en fluidos de estratificación estable, en los cuales la máxima amplitud del movimiento vertical tiene lugar en la zona por debajo de la interfase, la cual se encuentra entre las superficies del fluido. La principal fuerza de recuperación es la gravedad. Se cree que las ondas internas se generan en el mar por variaciones de la presión atmosférica y por influencia de ondas superficiales de baja frecuencia en aguas de profundidad variable. Las ondas internas pueden presentarse entre capas de diferentes densidades en el océano, porque la diferencia de densidades conlleva a una presión gravitacional o hidrostática que será una fuerza restuaradora si el fluido se desplaza verticalmente. |
| Tipo: Journal Contribution |
Palavras-chave: Internal waves; Surface wave-internal wave interactions. |
| Ano: 1989 |
URL: http://hdl.handle.net/1834/2349 |
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| Nieuwkoop, Jurgen; Spronk, Joep. |
| Asplenium forisiense is a small evergreen fern, normally growing on siliceous rocks and almost restricted to the south-western part of Europe. In 1988 it was discovered on a concrete wall along the Eindhoven canal during an inventory of Potamogeton species by boat. Forty-one individuals of the fern appeared to thrive on sandy soil between two iron beams used for a provisonal restoration. The nearest former locality of A. forisiense was in Belgium, prov. of West-Brabant, Saint-Denis-lez-Mons, where it was recorded in 1858, but has not been found since. |
| Tipo: Article / Letter to the editor |
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| Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/528106 |
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| Registros recuperados: 2.039 | |
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