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Maintenance of spatial distribution, density and size structure pattern of freshwater mussel Diplodon chilensis gray, 1828 (Bivalvia: Hyriidae) in the Panguipulli Lake, Chile

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
EN
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99.71957%
The purpose of the present study was to verify eventual changes in spatial distribution, density and size structure in a population of Diplodon chilensis inhabiting sandy and sand-gravel substrates in the Lake Panguipulli after 16 years of studies carried out in the mentioned population. Results indicate that mussels show in 2003 an aggregated spatial distribution in both substrates and a more aggregated distribution in sand - gravel than sandy substrate as in 1987. As in 1987, density was significantly higher in sand - gravel substratum in 2003 (P < 0.01). There were not significantly differences in density within the period elapsed in the same type of substratum. Size structure of population did not show much changes. Nonetheless, young were registered in both substrates in 2003, indicating that recruitment occurred. The results are discussed in relation to the role of these bivalves in the ecosystem and their potential use in ecological evaluation of lacustrine environments.; El propósito del presente estudio fue comprobar si han ocurrido cambios, después de 16 años, en los patrones de abundancia, distribución espacial y estructura de talla de la almeja de agua dulce Diplodon chilensis en sustratos arenosos y areno-pedregosos del sector Chauquén del Lago Panguipulli. Los resultados indican que las almejas en 1987 y 2003 presentan una distribución espacial agregada en ambos sustratos y con una mayor fuerza de la agregación en los sustratos areno-pedregosos que arenosos. La densidad fue significativamente mayor en sustrato areno-pedregoso...

Diplodon patagonicus (Bivalvia: Hyriidae): To be or not to be

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
ES
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58.418403%
Se entregan antecedentes que establecen que Diplodon patagonicus (D'Orbigny 1835) señalado como especie presente en la región Neo tropica-Patagonia por Graf & Cummins (2007) corresponde aDiplodon chilensis patagonicus (D'Orbigny 1846) (sensu Haas 1969).

Diplodon chilensis gray, 1828 (Bivalvia: Hyriidae) a potential residual waters depurator on inland water salmonid fish-farms : A laboratory scale study

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
EN
Relevância na Pesquisa
99.97356%
The aim of the present study was to experimentaly evaluate the capability of the freshwater mussel Diplodon chilensis as a potential depurator of residual waters in fish farming. With this purpose, the present study was carried out at the fish farm of the School of Aquaculture of the Catholic University- Temuco, Chile (38°46'S; 72°38'W). The experimental design consisted of 12 poly vinyl chloride trays of 50x20x20cm corresponding to 3 treatments with 3 replicates each treatment and their respective controls. Each tray contained sterilized sand substratum and running water from a trout feeding tank. The treatments 1, 2, 3 contained 15, 30 and 60 mussels respectively, while the control trays contained no mussels. The growth tank contained 5,2k/m3 of Oncorhynchus mykiss. The trouts were fed daily with 37g of fish food during the time of the experiment duration. At time 0 the wet weight and length of each mussel was measured to determine the physiological state of the specimens through the Condition index. At the onset of the experiment it was determined the mortality and the Condition index of each individual. Also water samples from each tray corresponding to the 3 treatments, their respective replicates and controls were taken at time 0...