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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Autores principales: López, N.I., Duarte, C.M., Vallespinós, F., Romero, J., Alcoverro, T.
Formato: JOUR
Materias:
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
nutrient
plant growth
Spain
Bacteria (microorganisms)
Halophila
Posidonia oceanica
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00220981_v187_n1_p39_Lopez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00220981_v187_n1_p39_Lopez2023-10-03T14:26:17Z Bacterial activity in NW Mediterranean seagrass (Posidonia oceanica) sediments López, N.I. Duarte, C.M. Vallespinós, F. Romero, J. Alcoverro, T. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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
López, N.I.
Duarte, C.M.
Vallespinós, F.
Romero, J.
Alcoverro, T.
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.
format JOUR
author López, N.I.
Duarte, C.M.
Vallespinós, F.
Romero, J.
Alcoverro, T.
author_facet López, N.I.
Duarte, C.M.
Vallespinós, F.
Romero, J.
Alcoverro, T.
author_sort López, N.I.
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
url http://hdl.handle.net/20.500.12110/paper_00220981_v187_n1_p39_Lopez
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AT duartecm bacterialactivityinnwmediterraneanseagrassposidoniaoceanicasediments
AT vallespinosf bacterialactivityinnwmediterraneanseagrassposidoniaoceanicasediments
AT romeroj bacterialactivityinnwmediterraneanseagrassposidoniaoceanicasediments
AT alcoverrot bacterialactivityinnwmediterraneanseagrassposidoniaoceanicasediments
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