Internal waves effect on the Gulf of California phytoplankton
During the late-fall, an experiment was performed in the midriff island region of the Gulf of California to study the internal wave effect on primary production and phytoplankton biomass temporal variability. A spot east of the Ángel de la Guarda Island was monitored during 48 hours, and w...
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Iniversidad Autónoma de Baja California
2002
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oai:cienciasmarinas.com.mx:article-2222019-04-30T21:35:52Z Internal waves effect on the Gulf of California phytoplankton Efecto de las ondas internas en el fitoplancton del Golfo de California Gaxiola-Castro, G Álvarez-Borrego, S Nájera-Martínez, S Zirino, AR Phytoplankton photosynthetic parameters chlorophyll internal waves Gulf of California Fitoplancton parámetros fotosintéticos clorofila ondas internas Golfo de California During the late-fall, an experiment was performed in the midriff island region of the Gulf of California to study the internal wave effect on primary production and phytoplankton biomass temporal variability. A spot east of the Ángel de la Guarda Island was monitored during 48 hours, and water samples were taken for measuring pH, dissolved oxygen, inorganic nutrients (NO3 and PO4) and chlorophyll a. Photosynthesis-irradiance curves were generated for phytoplankton collected from depths corresponding to 50% and 1% light levels. With spring tides, internal waves altered significantly the water column structure, with a change in the stratification field. Nutrient concentrations at depths > 20 m increased by as much as two-fold, with addition of > 1.0 µM for PO4 and > 7.0 µM for NO3. Chlorophyll a increased by more than 40%, between the surface and the deep chlorophyll maximum, during the same period. The assimilation number, P*m, for the 50%Eo depth decreased to near 20% of its initial value, without an apparent change in this parameter for the phytoplankton collected from the 1%Eo level. Our data support the hypothesis that P*m decreased as a result of vertical advection in the area, transporting photoacclimated phytoplankton from deeper waters toward the surface. The importance of taking these phenomena into consideration when calculating primary production for such dynamic areas using remote sensing data and chlorophyll-light models is discussed. Con el propósito de estudiar el efecto de las ondas internas en la producción primaria y la biomasa del fitoplancton, se realizó un experimento en la región de las grandes islas del Golfo de California al final del otoño. Durante 48 horas se monitoreó un punto al este de Isla Ángel de la Guarda, y se tomaron muestras de agua para medir pH, oxígeno disuelto, nutrientes inorgánicos (NO3 y PO4) y clorofila a. Se generaron curvas fotosíntesis-irradiancia para muestras de fitoplancton colectadas de profundidades correspondientes a los niveles de luz de 50% y 1% de la irradiancia superficial (Eo). Las ondas internas cambiaron la estructura de la columna de agua significativamente. A profundidades > 20 m las concentraciones de nutrientes aumentaron hasta el doble, con incrementos de hasta > 1.0 µM de PO4 y > 7.0 µM de NO3. La clorofila a aumentó hasta > 40% entre la superficie y el máximo profundo de clorofila. El número de asimilación, P*m, para la profundidad de 50%Eo disminuyó a cerca de 20% de su valor inicial, sin un cambio aparente de este parámetro para el fitoplancton colectado de la profundidad de 1%Eo. Los datos obtenidos apoyan la hipótesis de que P*m disminuyó debido a la advección vertical en el área, por transporte del fitoplancton de aguas profundas hacia la superficie, fotoaclimatado a irradiancias más bajas. Se discute sobre la importancia de tomar estos fenómenos en consideración al calcular la producción primaria para estas áreas tan dinámicas, usando datos de sensores remotos y modelos clorofila-luz. Iniversidad Autónoma de Baja California 2002-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/222 10.7773/cm.v28i3.222 Ciencias Marinas; Vol. 28 No. 3 (2002); 297-309 Ciencias Marinas; Vol. 28 Núm. 3 (2002); 297-309 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/222/189 |
| institution |
Ciencias Marinas |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Gaxiola-Castro, G Álvarez-Borrego, S Nájera-Martínez, S Zirino, AR |
| spellingShingle |
Gaxiola-Castro, G Álvarez-Borrego, S Nájera-Martínez, S Zirino, AR Internal waves effect on the Gulf of California phytoplankton |
| author_facet |
Gaxiola-Castro, G Álvarez-Borrego, S Nájera-Martínez, S Zirino, AR |
| author_sort |
Gaxiola-Castro, G |
| title |
Internal waves effect on the Gulf of California phytoplankton |
| title_short |
Internal waves effect on the Gulf of California phytoplankton |
| title_full |
Internal waves effect on the Gulf of California phytoplankton |
| title_fullStr |
Internal waves effect on the Gulf of California phytoplankton |
| title_full_unstemmed |
Internal waves effect on the Gulf of California phytoplankton |
| title_sort |
internal waves effect on the gulf of california phytoplankton |
| description |
During the late-fall, an experiment was performed in the midriff island region of the Gulf of California to study the internal wave effect on primary production and phytoplankton biomass temporal variability. A spot east of the Ángel de la Guarda Island was monitored during 48 hours, and water samples were taken for measuring pH, dissolved oxygen, inorganic nutrients (NO3 and PO4) and chlorophyll a. Photosynthesis-irradiance curves were generated for phytoplankton collected from depths corresponding to 50% and 1% light levels. With spring tides, internal waves altered significantly the water column structure, with a change in the stratification field. Nutrient concentrations at depths > 20 m increased by as much as two-fold, with addition of > 1.0 µM for PO4 and > 7.0 µM for NO3. Chlorophyll a increased by more than 40%, between the surface and the deep chlorophyll maximum, during the same period. The assimilation number, P*m, for the 50%Eo depth decreased to near 20% of its initial value, without an apparent change in this parameter for the phytoplankton collected from the 1%Eo level. Our data support the hypothesis that P*m decreased as a result of vertical advection in the area, transporting photoacclimated phytoplankton from deeper waters toward the surface. The importance of taking these phenomena into consideration when calculating primary production for such dynamic areas using remote sensing data and chlorophyll-light models is discussed. |
| publisher |
Iniversidad Autónoma de Baja California |
| publishDate |
2002 |
| url |
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/222 |
| _version_ |
1715723944172978176 |
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