Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments
We examine here the hypothesis that benthic bacterial activity in seagrass [Posidonia oceanica (L.) Delile] meadows is dependent on seagrass growth and availability of inorganic nutrients in the sediments. This was achieved by measuring bacterial activity (ammonification rates, and exoproteolytic an...
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1995
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220981_v187_n1_p39_Lopez http://hdl.handle.net/20.500.12110/paper_00220981_v187_n1_p39_Lopez |
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paper:paper_00220981_v187_n1_p39_Lopez2023-06-08T14:45:45Z Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments Ammonification rate Carbon supply Exoenzymatic activity Nutrient availability Seasonality organic carbon organic matter phosphorus bacteria microbial activity seagrass sediment bacterium competition detritus grass inorganic nutrient metabolism microbial activity nutrient plant growth seagrass sediment Spain Spain Bacteria (microorganisms) Halophila Posidonia oceanica We examine here the hypothesis that benthic bacterial activity in seagrass [Posidonia oceanica (L.) Delile] meadows is dependent on seagrass growth and availability of inorganic nutrients in the sediments. This was achieved by measuring bacterial activity (ammonification rates, and exoproteolytic and exoglucosidase activities) during an annual cycle in five P. oceanica meadows in the NW Mediterranean. Benthic bacterial activity was high, and tended to increase with increasing seagrass production. This trend is likely to involve a direct effect derived from the greater supply of organic carbon in productive meadows, and an indirect effect derived from the fact that productive meadows develop over nutrient-rich sediments and yield nutrient-rich detritus. Phosphorus availability to bacteria was low, for plant detritus was deficient in phosphorus relative to bacterial requirements, and bacterial activity was reduced after seagrasses depleted inorganic phosphorus from the sediments at the onset of exponential plant growth. These results indicate that, on local and annual time scales, benthic bacterial activity is directly related to seagrass production in the NW Mediterranean, because of enhanced inputs of organic matter by the seagrasses, while on seasonal scales, bacteria and seagrass metabolism are inversely related, apparently because of competition for inorganic nutrients. © 1995. 1995 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220981_v187_n1_p39_Lopez http://hdl.handle.net/20.500.12110/paper_00220981_v187_n1_p39_Lopez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Ammonification rate Carbon supply Exoenzymatic activity Nutrient availability Seasonality organic carbon organic matter phosphorus bacteria microbial activity seagrass sediment bacterium competition detritus grass inorganic nutrient metabolism microbial activity nutrient plant growth seagrass sediment Spain Spain Bacteria (microorganisms) Halophila Posidonia oceanica |
| spellingShingle |
Ammonification rate Carbon supply Exoenzymatic activity Nutrient availability Seasonality organic carbon organic matter phosphorus bacteria microbial activity seagrass sediment bacterium competition detritus grass inorganic nutrient metabolism microbial activity nutrient plant growth seagrass sediment Spain Spain Bacteria (microorganisms) Halophila Posidonia oceanica Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments |
| topic_facet |
Ammonification rate Carbon supply Exoenzymatic activity Nutrient availability Seasonality organic carbon organic matter phosphorus bacteria microbial activity seagrass sediment bacterium competition detritus grass inorganic nutrient metabolism microbial activity nutrient plant growth seagrass sediment Spain Spain Bacteria (microorganisms) Halophila Posidonia oceanica |
| description |
We examine here the hypothesis that benthic bacterial activity in seagrass [Posidonia oceanica (L.) Delile] meadows is dependent on seagrass growth and availability of inorganic nutrients in the sediments. This was achieved by measuring bacterial activity (ammonification rates, and exoproteolytic and exoglucosidase activities) during an annual cycle in five P. oceanica meadows in the NW Mediterranean. Benthic bacterial activity was high, and tended to increase with increasing seagrass production. This trend is likely to involve a direct effect derived from the greater supply of organic carbon in productive meadows, and an indirect effect derived from the fact that productive meadows develop over nutrient-rich sediments and yield nutrient-rich detritus. Phosphorus availability to bacteria was low, for plant detritus was deficient in phosphorus relative to bacterial requirements, and bacterial activity was reduced after seagrasses depleted inorganic phosphorus from the sediments at the onset of exponential plant growth. These results indicate that, on local and annual time scales, benthic bacterial activity is directly related to seagrass production in the NW Mediterranean, because of enhanced inputs of organic matter by the seagrasses, while on seasonal scales, bacteria and seagrass metabolism are inversely related, apparently because of competition for inorganic nutrients. © 1995. |
| title |
Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments |
| title_short |
Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments |
| title_full |
Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments |
| title_fullStr |
Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments |
| title_full_unstemmed |
Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments |
| title_sort |
bacterial activity in nw mediterranean seagrass (posidonia oceanica) sediments |
| publishDate |
1995 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220981_v187_n1_p39_Lopez http://hdl.handle.net/20.500.12110/paper_00220981_v187_n1_p39_Lopez |
| _version_ |
1768545451294851072 |