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Estimation de la biomasse d'huîtres non cultivées dans le bassin de Marennes-Oléron ArchiMer
Prou, Jean; Pouvreau, Stephane; Renaud, Vivian.
In the Marennes-Oléron oyster culture basin, the cultivated oyster stock shows an unbalanced age distribution: 25 000 to 30 000 tonnes are commercialized each year for a total cultivated biomass of 95 000 tonnes (1993). The biological overexploitation of the basin requires a reduction of the stock in order to get back to productivity rates that are compatible with the restrictions of the oyster market. This study gives an estimated natural deposit biomass of around 3 000 tonnes. An estimate of the abandoned and wild oyster biomass shows that 20 000 tonnes of these animals can be considered as competitors to cultivated oysters. [...].
Tipo: Text Palavras-chave: Bassin Marennes Oléron; Echantillonnage; Estimation; Répartition spatiale; Typologie; Biomasse; Crassostrea gigas; Huîtres.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/rapport-4741.PDF
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Etude pluridisciplinaire en écologie lagunaire (étang de Thau, France) : stratégie d'échantillonnage et organisation spatiale du phytoplancton ArchiMer
Jarry, Vincent.
Une étude pluridisciplinaire sur l'écologie l'étang de Thau a permis de récolter une quantité importante d'information, à quatre périodes différentes de l'année (1986-1987), sur un réseau de 63 stations réparties selon un maillage carré de 1 km. Fort de cette information multivariée nous proposons une méthodologie pour sélectionner un sous-ensemble de station (20) permettant de reproduire la répartition spatiale d'une dizaine de variables environnementales. Après cette première réflexion sur la stratégie d'échantillonnage, nous abordons en deux étapes l'étude du phytoplancton de l'étang de Thau. En premier lieu, en comparant la répartition spatiale de pigments chlorophylliens (chlorophylle a, chlorophylle b et chlorophylle c) avec celle des communautés...
Tipo: Text Palavras-chave: Phytoplancton; Pigments chlorophylliens; Structure des communautés; Répartition spatiale; Écologie lagunaire; Modélisation écologique; Stratégie d'échantillonnage; Analyses multivariées.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00055/16579/14081.pdf
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Spatial structure of coral reef fish communities in the Ryukyu Islands, southern Japan ArchiMer
Lecchini, D; Adjeroud, M; Pratchett, Ms; Cadoret, L; Galzin, R.
Coral reef fishes often exhibit a high degree of structure in their distribution and abundance, but the factors that influence their spatial arrangement are poorly understood. This study sought to explain the spatial structure of coral reef fish communities in the Ryukyu Archipelago. southern Japan. Visual surveys of coral reef fishes were conducted at multiple stations across the fringing reef (from the inner reef flat to the outer slope) at each of three different islands; Aka, Ishigaki and Sesoko. Spatial variation in fish communities (within and among reefs) was then compared to changes in environmental variables (water depth, distance from the shoreline, reef zone, coral abundance and coral richness). Despite being small islands, the total species...
Tipo: Text Palavras-chave: Analyse des correspondances canoniques; Répartition spatiale; Pomacentridae; Zonation; Canonical correspondence analysis; Distribution; Pomacentridae; Zonation.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43246/42977.pdf
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Répartition spatio-temporelle de l’oxygène. Sous-région marine Méditerranée occidentale. Evaluation initiale DCSMM. ArchiMer
Lefèvre, Dominique.
Tipo: Text Palavras-chave: Méditerranée; Oxygène dissous; Distribution; Evolution saisonnière; Répartition spatiale.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00331/44191/43760.pdf
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