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| Format: | Artículo científico |
| Language: | en |
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Universidad Autónoma de Baja California
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=48003108 |
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Table of Contents:
- Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin) Andrew W. Dale Ricardo Prego Ciencias de la Tierra NW Spain upwelling Pontevedra Ria nutrient budget A non-stationary state mass balance of the type advocated by the International Geosphere-Biosphere Programme/Land-OceanInteractions in the Coastal Zone (IGBP/LOICZ) has been used to assess net ecosystem metabolism in the Pontevedra Ria (NWSpain), a large embayment subject to transient upwelling of Eastern North Atlantic Central Water (ENACW) under favourablemeteorological conditions. Nitrate (NO3) and phosphate (PO43) data spanning 12 months were resolved at the oceanic boundaryby treating the ria as a single box of constant volume. The nutrient budget was scaled up to an estimate of net communityproduction (NCP) using the compositional relationship of local phytoplankton. The mean annual NCP predicted by the NO3balance was 24.0 mgC m2 h1, and 35.8 mgC m2 h1 by the PO43 budget. Nutrient fluxes into the reservoir were strongly drivenby the incoming oceanic flow throughout the year, which supplied 88% and 98% of the total NO3 and PO43 load, respectively. Ahigh NCP (NO3) of 57.2 mgC m2 h1 was calculated for the height of the growth season contemporaneous with ENACWintrusion, whereas a slightly higher value of 61.4 mgC m2 h1 corresponded to PO43. Nutrient limitation was variable throughoutthe sampling, switching from PO43 to NO3 from winter to spring concurrent with a drop in riverine PO43 input. Scaling theinorganic nutrients to carbon units, the Pontevedra Ria may be considered as net autotrophic, although the NO3 budget suggestsalternation between autotrophy and heterotrophy over an annual cycle. 2005 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48003108 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1B Vol.31