Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current

Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current

The abundance of coccoid cyanobacteria was counted within the euphotic zone at a station in Delfín Basin, in the northern Gulf of California, and at a station in the California Current, off Todos Santos Bay, during 1993. The abundance of cyanobacteria at both stations was between 107 and 108 cells L...

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Autores principales: Díaz, C, Maske, H
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2000
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/594
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id oai:cienciasmarinas.com.mx:article-594
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Díaz, C
Maske, H
spellingShingle Díaz, C
Maske, H
Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current
author_facet Díaz, C
Maske, H
author_sort Díaz, C
title Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current
title_short Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current
title_full Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current
title_fullStr Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current
title_full_unstemmed Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current
title_sort abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of california and the mexican california current
description The abundance of coccoid cyanobacteria was counted within the euphotic zone at a station in Delfín Basin, in the northern Gulf of California, and at a station in the California Current, off Todos Santos Bay, during 1993. The abundance of cyanobacteria at both stations was between 107 and 108 cells L–1. Comparison with other concomitantly sampled parameters, i.e., irradiance, temperature, nutrients and chlorophyll a, showed no significant correlation with the cyanobacterial abundance. The contribution of cyanobacteria to the total in situ chlorophyll a concentration was calculated using the cyanobacterial abundance, an average published value of 1.0fgChl a cell–1 and a reduced pigment extraction efficiency in cyanobacteria. Cyanobacteria contributed, in half of the cases, more than 10% and more than 4% of the total chlorophyll in Delfín Basin and the California Current, respectively. Again, this relative contribution was not related to the other concomitantly measured in situ parameters. In Synechococcus (WH-7803) cultures, the cellular chlorophyll a concentration was measured after extraction by soaking the samples in different solvents: 90% acetone and dimethylsulfoxide/acetone/water (DMSO/acetone). The cellular chlorophyll of WH-7803 extracted with DMSO/acetone was a factor of 1.9 times higher than the cellular chlorophyll concentration extracted with 90% acetone without sonication. Assuming that only the cyanobacteria would yield higher chlorophyll concentrations with DMSO/acetone extraction, then the chlorophyll a concentrations measured with 90% acetone extraction without sonication underestimated, in half of the cases, the real concentrations of in situ chlorophyll a by more than 5% in the northern Gulf of California and more than 2% in the California Current.
publisher Iniversidad Autónoma de Baja California
publishDate 2000
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/594
_version_ 1715723987481264128
spelling oai:cienciasmarinas.com.mx:article-5942019-05-03T23:19:22Z Abundance of coccoid cyanobacteria, hydrographic parameters and the possible underestimation of in situ chlorophyll a in the northern gulf of California and the Mexican California Current Abundancia de cianobacterias cocales, parámetros hidrográficos y la posible subestimación de la clorofila a in situ en el norte del golfo de California y la corriente de California, México Díaz, C Maske, H picoplankton chlorophyll a nutrients Gulf of California California Current picoplancton clorofila a nutrientes Golfo de California Corriente de California The abundance of coccoid cyanobacteria was counted within the euphotic zone at a station in Delfín Basin, in the northern Gulf of California, and at a station in the California Current, off Todos Santos Bay, during 1993. The abundance of cyanobacteria at both stations was between 107 and 108 cells L–1. Comparison with other concomitantly sampled parameters, i.e., irradiance, temperature, nutrients and chlorophyll a, showed no significant correlation with the cyanobacterial abundance. The contribution of cyanobacteria to the total in situ chlorophyll a concentration was calculated using the cyanobacterial abundance, an average published value of 1.0fgChl a cell–1 and a reduced pigment extraction efficiency in cyanobacteria. Cyanobacteria contributed, in half of the cases, more than 10% and more than 4% of the total chlorophyll in Delfín Basin and the California Current, respectively. Again, this relative contribution was not related to the other concomitantly measured in situ parameters. In Synechococcus (WH-7803) cultures, the cellular chlorophyll a concentration was measured after extraction by soaking the samples in different solvents: 90% acetone and dimethylsulfoxide/acetone/water (DMSO/acetone). The cellular chlorophyll of WH-7803 extracted with DMSO/acetone was a factor of 1.9 times higher than the cellular chlorophyll concentration extracted with 90% acetone without sonication. Assuming that only the cyanobacteria would yield higher chlorophyll concentrations with DMSO/acetone extraction, then the chlorophyll a concentrations measured with 90% acetone extraction without sonication underestimated, in half of the cases, the real concentrations of in situ chlorophyll a by more than 5% in the northern Gulf of California and more than 2% in the California Current. La abundancia de cianobacterias cocales en la zona eufótica en una localidad ubicada dentro de la Cuenca Delfín, en el norte del Golfo de California, y otra ubicada en la Corriente de California, hacia la Bahía de Todos Santos (México), fue de 107 a 108 cél L–1 durante algunos meses de 1993. Su comparación con los parámetros de muestreo de irradiancia, temperatura, nutrientes y clorofila a no muestra una correlación significativa con la abundancia de cianobacterias. Se calculó la contribución de las cianobacterias a la concentración in situ de clorofila a empleando un valor promedio de la concentración celular de clorofila a en cultivos de Synechococcus obtenido de la literatura (1.0 fg Chl a cél–1), una reducida eficiencia de extracción de clorofila a y la abundancia de cianobacterias cocales in situ. La contribución de las cianobacterias, en la mitad de los casos, para la Cuenca Delfín fue arriba de 10% y para la Corriente de California, arriba de 4% del total de la clorofila a. La contribución relativa no muestra relación con los parámetros ambientales. Se realizaron mediciones de la concentración de clorofila celular en Synechococcus (WH-7803) empleando, para su extracción sin tratamiento físico por diferentes solventes, acetona al 90% y dimetil sulfóxido/acetona/agua (DMSO/acetona). La concentración de clorofila celular en WH-7803 extraída con DMSO/acetona fue un factor de 1.9 veces más alto que la concentración de clorofila extraída con acetona al 90%. Suponiendo que solamente las cianobacterias pueden alcanzar altas concentraciones de clorofila en la extracción con DMSO/acetona, entonces las concentraciones de clorofila a medidas en la extracción con acetona al 90% subestimaron las concentraciones reales in situ de la clorofila a, en la mitad de los casos, en más de 5% en el norte del Golfo de California y más de 2% en la Corriente de California. Iniversidad Autónoma de Baja California 2000-03-06 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/594 10.7773/cm.v26i3.594 Ciencias Marinas; Vol. 26 No. 3 (2000); 441-461 Ciencias Marinas; Vol. 26 Núm. 3 (2000); 441-461 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/594/531

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