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Distinct age and landscape influence on two reservoirs under the same climate IPB - Escola Superior Agrária
Geraldes, Ana Maria; Boavida, Maria José.
With the purpose of finding out whether different landscape occupation could affect water quality in two reservoirs of distinct age and subjected to the same climatic influence, several factors were investigated in a study lasting from January 2000 till December 2001. Total phosphorus, orthophosphate, chlorophyll a concentrations and water colour were determined monthly in winter and biweekly in summer, in two reservoirs located in the Portuguese part of River Douro catchment. Complementarily, variables such as nitrate, ammonium ion and ammonia gas, as well as water temperature, dissolved oxygen, conductivity, and transparency were measured. Trophic state of both reservoirs was assessed by computation of Carlson’s Trophic State Index. The potential...
Tipo: Article Palavras-chave: Trophic state; Nutrient sources; Land use; Reservoir age; Water quality; Socio-economic influence.
Ano: 2003 URL: http://hdl.handle.net/10198/712
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Nutrional inadequacy of Nannochloris atomus and Stichoccocucs bacillaris for the oyster Crassostre gigas (Thunberg) larvae ArchiMer
Robert, Rene.
The evaluation of Nannochloris atomliS and StichoccocllS bacillaris as nutrient sources for oyster larvae has been attempted in the present work. After a study of their grawth and size distributions, these two species were used as food for Crassostrea gigas larvae. Despite praper sizes (2.5 to 20 µm3) the larval development of Crassostrea gigas was poor. Evaluation of ingestion and digestion of both algae, by means of epifluorescence microscopy, on 2 day and 6 day old larvae showed that they were normally ingested but weakly digested. Consequently, their nutritional inadequacy for larval molluscs may be also related to their indigestibility.
Tipo: Text Palavras-chave: Stichococcus bacillaris; Nannochloris atomus; Larvae; Nutrient sources; Huître; Crassostrea gigas; Nutrition; Stichococcus bacillaris; Nannochloris atomus; Larve; Algue fourrage; Huître; Crassostrea gigas; Nutrition.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-6198.PDF
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