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The seasonal dynamics of nutrient and chlorophyll a concentrations on the SE Mediterranean shelf-slope ArchiMer
Herut, Barak; Almogi-labin, Ahuva; Jannink, Natasja; Gertman, Isaac.
We report the results of a sequence of twelve research cruises over a two-year period, from June 1996 through May 1998 that examined the seasonal variations in the nutrient (NO(3)(-) PO(4)(3-), and Si(OH)(4)) and in the chlorophyll a (Chl a) concentrations at two permanent stations across the SE Mediterranean continental shelf and slope (120 and 400 m water depth off the Israeli coast). Seasonally-dependent Chl a concentrations ranged between 0.003 and 0.415 mg m(-3). Following autumn and winter a distinct biomass phytoplankton peak was produced (similar to 30 mg Chl a m(-2) in the upper 120 m) and a subsequent moderate spring peak was observed. In the decomposition zone (120-400 m), an opposite pattern was observed with decreasing amounts of NO(3)(-) and...
Tipo: Text Palavras-chave: Nutriments; Méditerranée; Chlorophyll a; Oligothropie; Nutrients; Mediterranean; Chlorophyll alpha; Oligothropy.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43374/42837.pdf
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Evalution du bilan énergétique de l'huître creuse, Crassostrea gigas, en baie de Marennes-Oléron (France) ArchiMer
Soletchnik, Patrick; Goulletquer, Philippe; Heral, Maurice; Razet, Daniel; Geairon, Philippe.
This ecophysiological study was conducted on the Japanese oyster (Crassostrea gigas) reared in Marennes-Oléron bay (France), in May 1992. Measurements were achieved using natural food conditions on three different days (a, b, c) at different tide levels (coefficient of 49, 57, and 88). Total particulate matter was continuously monitored with a micro-computer and a turbidimeter probe. The "consumption" function was calculated using a new formula allowing for particulate leakage prior to the pre-ingestive particle sorting. This particle leakage represents a passive loss of particles flowing through the branchial filter. Comparisons of the consumption and absorption rates of organic matter and chlorophyll a showed significant differences between seston...
Tipo: Text Palavras-chave: Crassostrea gigas; Consumption rate; Selection efficiency; Absorption rate; Energetic budget; Organic matter; Chlorophyll alpha; Marennes-Oleron bay.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/1996/publication-3086.pdf
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