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| Format: | Artículo científico |
| Language: | en |
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Universidad de Costa Rica
2007
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| Online Access: | https://www.redalyc.org/articulo.oa?id=44955116 |
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| author | María Jesús Ferrara-Guerrero |
| author_facet | María Jesús Ferrara-Guerrero |
| contents | Variation of a benthic heterotrophic bacteria community with different respiratory metabolisms in Coyuca de Benítez coastal lagoon (Guerrero, México) María Jesús Ferrara-Guerrero María Elena Castellanos-Páez Gabriela Garza-Mouriño Biología oxygen aerobic sediments heterotrophic coastal lagoon The fluctuations of the number, biomass and composition of the heterotrophic community were studieddaily for two days, according to depth, pH, Eh, O2 and organic carbon concentration within a zone of thecanal between the Coyuca de Benítez lagoon (Guerrero, Mexico) and the coastal waters. At the three moments ofthe day studied (6 am, 2 pm and 10 pm), the oxygen concentrations in the overlying water and in the superficialsediment layer were near air-saturation in the diurnal samplings (582 µM at 6 am and 665 µM at 2 pm), andsub-satured during the night (158 µM). In the sediments, the models of vertical distribution of Eh and organiccarbon distributions were very irregular due to the bio-perturbation of the benthic, meio- and macrofauna, whoseactivity allows the superficial organic carbon to migrate towards sediment deeper layers. Vertical distribution ofthe different viable bacteria populations seems to be related to the hydrodynamic patterns of the communicatingcanal and sediments heterogeneity. In the sediment column, the heterotrophic bacteria total number varied from6.8 to 20.3 x 108 cells cm-3. The highest heterotrophic bacterial biomass values were encountered during thediurnal samplings (39.2 µgC.l-1 at 6 am and 34.4 µgC.l-1 at 2 pm) and the lowest during the night (9.7 µgC.l-1).The fluctuations of viable heterotrophic bacteria populations with different respiratory metabolisms (aerobic,microaerophilic and anaerobic) can be explained by the existence of suboxic microniches that appear whenparticles of sediment are resuspended due to the water circulation and the benthic infauna excavating activity,that allows the supernatant water oxygen to penetrate through its galleries towards deeper sediment zones. Thestatistical analysis (Multiple lineal regression model r2≥ 0.5) showed that the on the whole, the hydrologicalparameters are not influence over the bacterial number and bacterial biomass distribution (r2≤ 0.5), Nevertheless,the variations of the heterotrophic bacteria community observed in the two days sampling, seem to be governed(with F-values of 0.6 to 0.9) by the irregular flows of bio-available organic material and the sediment porosity.Rev. Biol. Trop. 55 (1): 157-169. Epub 2007 March. 31. 2007 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44955116 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.55 |
| format | Artículo científico |
| id | redalyc_44955116 |
| language | en |
| publishDate | 2007 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Variation of a benthic heterotrophic bacteria community with different respiratory metabolisms in Coyuca de Benítez coastal lagoon (Guerrero, México) María Jesús Ferrara-Guerrero Biología oxygen aerobic sediments heterotrophic coastal lagoon Variation of a benthic heterotrophic bacteria community with different respiratory metabolisms in Coyuca de Benítez coastal lagoon (Guerrero, México) María Jesús Ferrara-Guerrero María Elena Castellanos-Páez Gabriela Garza-Mouriño Biología oxygen aerobic sediments heterotrophic coastal lagoon The fluctuations of the number, biomass and composition of the heterotrophic community were studieddaily for two days, according to depth, pH, Eh, O2 and organic carbon concentration within a zone of thecanal between the Coyuca de Benítez lagoon (Guerrero, Mexico) and the coastal waters. At the three moments ofthe day studied (6 am, 2 pm and 10 pm), the oxygen concentrations in the overlying water and in the superficialsediment layer were near air-saturation in the diurnal samplings (582 µM at 6 am and 665 µM at 2 pm), andsub-satured during the night (158 µM). In the sediments, the models of vertical distribution of Eh and organiccarbon distributions were very irregular due to the bio-perturbation of the benthic, meio- and macrofauna, whoseactivity allows the superficial organic carbon to migrate towards sediment deeper layers. Vertical distribution ofthe different viable bacteria populations seems to be related to the hydrodynamic patterns of the communicatingcanal and sediments heterogeneity. In the sediment column, the heterotrophic bacteria total number varied from6.8 to 20.3 x 108 cells cm-3. The highest heterotrophic bacterial biomass values were encountered during thediurnal samplings (39.2 µgC.l-1 at 6 am and 34.4 µgC.l-1 at 2 pm) and the lowest during the night (9.7 µgC.l-1).The fluctuations of viable heterotrophic bacteria populations with different respiratory metabolisms (aerobic,microaerophilic and anaerobic) can be explained by the existence of suboxic microniches that appear whenparticles of sediment are resuspended due to the water circulation and the benthic infauna excavating activity,that allows the supernatant water oxygen to penetrate through its galleries towards deeper sediment zones. Thestatistical analysis (Multiple lineal regression model r2≥ 0.5) showed that the on the whole, the hydrologicalparameters are not influence over the bacterial number and bacterial biomass distribution (r2≤ 0.5), Nevertheless,the variations of the heterotrophic bacteria community observed in the two days sampling, seem to be governed(with F-values of 0.6 to 0.9) by the irregular flows of bio-available organic material and the sediment porosity.Rev. Biol. Trop. 55 (1): 157-169. Epub 2007 March. 31. 2007 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44955116 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.55 |
| title | Variation of a benthic heterotrophic bacteria community with different respiratory metabolisms in Coyuca de Benítez coastal lagoon (Guerrero, México) |
| topic | Biología oxygen aerobic sediments heterotrophic coastal lagoon |
| url | https://www.redalyc.org/articulo.oa?id=44955116 |