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	Provedor de dados ArchiMer (2) Autor Costil, F (1) Rondelaud, D (1) Palavra-chave Freshwater molluscs (2) Abundance (1) Biological control (1) Check lists (1) Chemical control (1) Frequency analysis (1) Fresh water (1) Gastropoda (1) Inventories (1) Lymnaea (1) Mathematical models (1) Mollusca (1) Physa (1) Ponds (1) Population density (1) Population dynamics (1) Mais... Tipo do documento Text (2) Ano 1991 (2) País France (2) Idioma Francês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Donnees sur les gasteropodes dulcicoles de l'ouest de la France: Mise en evidence de cinq groupes d'especes (ACP) ArchiMer Costil, F. 24 Species of Gastropoda, representing 3357 specimens, have been sampled in 57 varied ponds of Brittany (France). The most frequent species (at least in 10% of the samples) are considered according to their average abundance and dominance. The average specific richness of the ponds where the species have been collected is studied. In a second stage, the Gastropoda are analysed by means of a principal component analysis. The 1-2 plane correspond to 87% of the whole variance. This analysis associated with a cluster analysis led to the partition of 5 groups of species. Tipo: Text Palavras-chave: Gastropoda; Frequency analysis; Freshwater molluscs; Fresh water; Check lists; Inventories; Mathematical models; Ponds; Abundance. Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1713.pdf Le controle chimique et biologique de Lymnaea truncatula Mueller. Etude des effets a long terme ArchiMer Rondelaud, D. The treated habitats have not been recolonized by Lymnaea truncatula . Four aquatic snail species showed an increase in their numbers: L. glabra in the stations of Haute-Vienne, L. glabra, Physa acuta, P. hypnorum and Planorbis rotundatus in the habitats of Indre. The numbers of L. glabra and P. acuta reached their maximum on the third year and decreased thereafter; those of P. hypnorum and P. rotundatus slightly increased from the fourth or the fifth years treatment. The colonization of L. truncatula habitats was incomplete and did not reach over 50% of the surface for L. glabra and P. acuta , 20% for P. hypnorum and P. rotundatus . The bivalve Pisidium casertanum did not recolonize treated habitats. There were no modifications in the numbers of... Tipo: Text Palavras-chave: Physa; Lymnaea; Mollusca; Biological control; Chemical control; Population density; Population dynamics; Freshwater molluscs. Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1715.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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