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| Format: | Artículo científico |
| Language: | en |
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Universidad de Valparaíso
2012
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| Online Access: | https://www.redalyc.org/articulo.oa?id=47925145014 |
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Table of Contents:
- Phytoplankton photosynthetic parameters from the Gulf of California southern region Gerardo Verdugo-Díaz Aída Martínez-López Gilberto Gaxiola-Castro José Eduardo Valdez-Holguín Ciencias de la Tierra euphotic zone Gulf of California Photosynthetic parameters Phytoplankton physiologic response in the euphotic zone was determined by photosynthesis irradiance experiments carried out between June 2000 and June 2001 at Bahia de La Paz, Gulf of California, Mexico. A stratified water column was present, from June to September (stratification index > 200 J m-3), with the assimilation number (Pm) represented by an average of 3.7 mg C m-3 h-1, while for the period from November through February, the water column was homogeneous (stratification index = 0 J m-3) and the average was 9.2 mg C m-3 h-1. The maximum photosynthetic efficiency at low irradiances (α) of 0.017 mg C m-3 h-1 (μmol quanta m-2 s-1)-1 was the representative average for the stratified period, while 0.063 mg C m-3 h-1 (μmol quanta m-2 s-1)-1 was the corresponding value for the homogeneous period. The photosynthetic parameters (Pm and α) had an increase during mixing conditions, as result of phytoplankton photoacclimation to average irradiance in the euphotic zone. Diatom abundance (Pseudo-nitzschia delicatissima, Chaetoceros compressus and Coscinodiscus perforatus) were related with higher values of Pm, while lowest values of this parameter are associated with the dinoflagellate group. Average values estimated for the light saturation parameter (Ek) were 334, 173 and 91 μmol quanta m-2 s-1 for the surface, 10 and 1% of the euphotic zone, respectively. In general, nanophytoplankton (2-20 μm) dominated the phytoplanktonic community during the period studied. 2012 artículo científico 0717-3326 https://www.redalyc.org/articulo.oa?id=47925145014 en http://www.redalyc.org/revista.oa?id=479 Revista de Biología Marina y Oceanografía application/pdf Universidad de Valparaíso Revista de Biología Marina y Oceanografía (Chile) Num.3 Vol.47