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| Blanchard, Gf; Montagna, Pa. |
| A primary production simulation model was used to assess the effect of a brown tide (Chrysophytes) on benthic microalgal photosynthesis. This model is based on the assumption that photosynthesis of microphytobenthos is primarily determined by irradiance at the sediment-water interface and by the photophysiological response of microalgae to changes of this irradiance. So, irradiance recordings at the sediment-water interface were used as the forcing variable. The simulation indicates that before the introduction of the brown tide, primary production of microphytobenthos was physically controlled. Light levels, hence primary production rates, were very variable (<1-132 mg C m(-2) d(-1), CV = 80%) because wind-induced resuspension generates turbidity... |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00097/20785/18410.pdf |
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| Riera, Pascal; Montagna, Pa; Kalke, Rd; Richard, Pierre. |
| The trophic dynamic Links of migratory juvenile brown shrimp Penaeus aztecus were investigated along the South Texas coast from the Aransas Pass to Corpus Christi and Nueces Bay and to the nursery ground in the Nueces Delta. Shrimps and their potential food sources were measured for delta(13)C and delta(15)N ratios between December 1995 and July 1996. During this period, shrimp length increased from 10 to 11 mm, when the animals entered Corpus Christi Bay as larvae, to 80-90 mm, when they returned to Mexico Gulf as sub-adults. Brown shrimp exhibited spatial and temporal delta(13)C variation (from -25.2 to 12.5 parts per thousand), indicating a high diversity of food sources throughout their migration. From delta(13)C values, the main sources used as food... |
| Tipo: Text |
Palavras-chave: Penaeus aztecus; Food sources; Migration; Nursery area; Delta C 13 and delta N 15. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00000/10496/7604.pdf |
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