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
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Autónoma de Baja California
2000
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| _version_ | 1876448727874404352 |
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| author | Helmut Maske |
| author_facet | Helmut Maske |
| contents | 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 Helmut Maske Cecilia Díaz Ciencias de la Tierra nutrients picoplankton chlorophyll a Gulf of California California Current The abundance of coccoid cyanobacteria was counted within the euphotic zone at a station in DelfínBasin, 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 L1.Comparison with other concomitantly sampled parameters, i.e., irradiance, temperature, nutrients andchlorophyll a, showed no significant correlation with the cyanobacterial abundance. The contribution ofcyanobacteria to the total in situ chlorophyll a concentration was calculated using the cyanobacterialabundance, an average published value of 1.0fgChl a cell1 and a reduced pigment extraction efficiencyin cyanobacteria. Cyanobacteria contributed, in half of the cases, more than 10% and more than 4% ofthe total chlorophyll in Delfín Basin and the California Current, respectively. Again, this relativecontribution 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 soakingthe 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 thanthe cellular chlorophyll concentration extracted with 90% acetone without sonication. Assuming that onlythe cyanobacteria would yield higher chlorophyll concentrations with DMSO/acetone extraction, then thechlorophyll 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 Gulfof California and more than 2% in the California Current. 2000 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48026304 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.3 Vol.26 |
| format | Artículo científico |
| id | redalyc_48026304 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Autónoma de Baja California |
| spellingShingle | 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 Helmut Maske Ciencias de la Tierra nutrients picoplankton chlorophyll a Gulf of California 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 Helmut Maske Cecilia Díaz Ciencias de la Tierra nutrients picoplankton chlorophyll a Gulf of California California Current The abundance of coccoid cyanobacteria was counted within the euphotic zone at a station in DelfínBasin, 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 L1.Comparison with other concomitantly sampled parameters, i.e., irradiance, temperature, nutrients andchlorophyll a, showed no significant correlation with the cyanobacterial abundance. The contribution ofcyanobacteria to the total in situ chlorophyll a concentration was calculated using the cyanobacterialabundance, an average published value of 1.0fgChl a cell1 and a reduced pigment extraction efficiencyin cyanobacteria. Cyanobacteria contributed, in half of the cases, more than 10% and more than 4% ofthe total chlorophyll in Delfín Basin and the California Current, respectively. Again, this relativecontribution 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 soakingthe 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 thanthe cellular chlorophyll concentration extracted with 90% acetone without sonication. Assuming that onlythe cyanobacteria would yield higher chlorophyll concentrations with DMSO/acetone extraction, then thechlorophyll 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 Gulfof California and more than 2% in the California Current. 2000 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48026304 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.3 Vol.26 |
| 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 |
| topic | Ciencias de la Tierra nutrients picoplankton chlorophyll a Gulf of California California Current |
| url | https://www.redalyc.org/articulo.oa?id=48026304 |