Pelagic stocks and carbon and nitrogen uptake in a pearl farming atoll (Ahe, French Polynesia).
Mar Pollut Bull
; 167: 112352, 2021 Jun.
Article
en En
| MEDLINE
| ID: mdl-33873043
This study reports the first measurements of nitrogen uptake and new data on carbon fixation (15N/13C incorporation) for two size-fractionated phytoplankton (<2 µm and >2 µm), on organic matter, and phytoplankton stocks in Ahe lagoon. Data were collected between November and December 2017, during the hot season with prevailing trade winds. Ammonium and nitrate uptake data (7.58 to 39.81 and 1.80 to 21.43 µmol N m-3 h-1, respectively) suggest a rapid turn-over of N-nutrients in the water column and show that primary production was largely sustained by recycled nitrogen providing 68% of the pelagic N demand. These results highlight the spatial heterogeneity of the measured processes linked to the local hydrodynamics, exhibiting higher regenerated production in the more exploited southwestern part of the lagoon and a higher proportion of new production in the north. Intense nutrient recycling appears to promote nanophytoplankton production which is critical for pearl oyster growth.
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Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Acuicultura
/
Nitrógeno
Límite:
Animals
Idioma:
En
Revista:
Mar Pollut Bull
Año:
2021
Tipo del documento:
Article
Pais de publicación:
Reino Unido