Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream

Autores
Cochero, Joaquín; Romaní, Anna M.; Gómez, Nora
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In streams and rivers, the first organisms which directly receive and respond to nutrients are primary producers (algae, macrophytes) and microbial heterotrophs (bacteria, fungi) since they rely on available inorganic nutrients from the water column. The aim of the present study was to analyze the response of the epipelic microbial biofilm in a Pampean stream submitted to a continuous input of inorganic nutrients (nitrogen and phosphorus). For this purpose, we measured the effects of moderate nutrient addition during 14 mo on the epipelic biofilm community of a meso-eutrophic stream that runs through the Pampean plain. The effects of nutrient enrichment were tested by analyzing the difference in algal and bacterial biomass and 2 extracellular enzymatic activities (β;-glucosidase, phosphatase) at an enriched reach compared with those measured at an unmodified upstream reach. Overall, the response of the epipelon of this Pampean stream produced a slow and delayed effect on algal biomass increases, which might result in a delayed effect on the increase of bacterial densities. Neither phosphatase activity nor β;-glucosidase activity exhibited significant changes due to nutrient addition. This may be due to the fact that the phosphatase activities measured were basal activities, uninhibited by enrichment, and that the epipelic β;-glucosidase activity was regulated more by substrate availability than by any nutrient imbalance. Although changes are slow, if some of these changes were to become chronic, they would affect the functioning and services of the whole stream ecosystem.
Instituto de Limnología "Dr. Raul A. Ringuelet"
Materia
Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/85550

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network_name_str SEDICI (UNLP)
spelling Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean streamCochero, JoaquínRomaní, Anna M.Gómez, NoraCiencias Naturalesβ-glucosidaseBacterial biomassEpipelonPhosphataseIn streams and rivers, the first organisms which directly receive and respond to nutrients are primary producers (algae, macrophytes) and microbial heterotrophs (bacteria, fungi) since they rely on available inorganic nutrients from the water column. The aim of the present study was to analyze the response of the epipelic microbial biofilm in a Pampean stream submitted to a continuous input of inorganic nutrients (nitrogen and phosphorus). For this purpose, we measured the effects of moderate nutrient addition during 14 mo on the epipelic biofilm community of a meso-eutrophic stream that runs through the Pampean plain. The effects of nutrient enrichment were tested by analyzing the difference in algal and bacterial biomass and 2 extracellular enzymatic activities (β;-glucosidase, phosphatase) at an enriched reach compared with those measured at an unmodified upstream reach. Overall, the response of the epipelon of this Pampean stream produced a slow and delayed effect on algal biomass increases, which might result in a delayed effect on the increase of bacterial densities. Neither phosphatase activity nor β;-glucosidase activity exhibited significant changes due to nutrient addition. This may be due to the fact that the phosphatase activities measured were basal activities, uninhibited by enrichment, and that the epipelic β;-glucosidase activity was regulated more by substrate availability than by any nutrient imbalance. Although changes are slow, if some of these changes were to become chronic, they would affect the functioning and services of the whole stream ecosystem.Instituto de Limnología "Dr. Raul A. Ringuelet"2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf145-155http://sedici.unlp.edu.ar/handle/10915/85550enginfo:eu-repo/semantics/altIdentifier/issn/0948-3055info:eu-repo/semantics/altIdentifier/doi/10.3354/ame01630info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:30Zoai:sedici.unlp.edu.ar:10915/85550Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:30.923SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
title Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
spellingShingle Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
Cochero, Joaquín
Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
title_short Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
title_full Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
title_fullStr Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
title_full_unstemmed Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
title_sort Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
dc.creator.none.fl_str_mv Cochero, Joaquín
Romaní, Anna M.
Gómez, Nora
author Cochero, Joaquín
author_facet Cochero, Joaquín
Romaní, Anna M.
Gómez, Nora
author_role author
author2 Romaní, Anna M.
Gómez, Nora
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
topic Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
dc.description.none.fl_txt_mv In streams and rivers, the first organisms which directly receive and respond to nutrients are primary producers (algae, macrophytes) and microbial heterotrophs (bacteria, fungi) since they rely on available inorganic nutrients from the water column. The aim of the present study was to analyze the response of the epipelic microbial biofilm in a Pampean stream submitted to a continuous input of inorganic nutrients (nitrogen and phosphorus). For this purpose, we measured the effects of moderate nutrient addition during 14 mo on the epipelic biofilm community of a meso-eutrophic stream that runs through the Pampean plain. The effects of nutrient enrichment were tested by analyzing the difference in algal and bacterial biomass and 2 extracellular enzymatic activities (β;-glucosidase, phosphatase) at an enriched reach compared with those measured at an unmodified upstream reach. Overall, the response of the epipelon of this Pampean stream produced a slow and delayed effect on algal biomass increases, which might result in a delayed effect on the increase of bacterial densities. Neither phosphatase activity nor β;-glucosidase activity exhibited significant changes due to nutrient addition. This may be due to the fact that the phosphatase activities measured were basal activities, uninhibited by enrichment, and that the epipelic β;-glucosidase activity was regulated more by substrate availability than by any nutrient imbalance. Although changes are slow, if some of these changes were to become chronic, they would affect the functioning and services of the whole stream ecosystem.
Instituto de Limnología "Dr. Raul A. Ringuelet"
description In streams and rivers, the first organisms which directly receive and respond to nutrients are primary producers (algae, macrophytes) and microbial heterotrophs (bacteria, fungi) since they rely on available inorganic nutrients from the water column. The aim of the present study was to analyze the response of the epipelic microbial biofilm in a Pampean stream submitted to a continuous input of inorganic nutrients (nitrogen and phosphorus). For this purpose, we measured the effects of moderate nutrient addition during 14 mo on the epipelic biofilm community of a meso-eutrophic stream that runs through the Pampean plain. The effects of nutrient enrichment were tested by analyzing the difference in algal and bacterial biomass and 2 extracellular enzymatic activities (β;-glucosidase, phosphatase) at an enriched reach compared with those measured at an unmodified upstream reach. Overall, the response of the epipelon of this Pampean stream produced a slow and delayed effect on algal biomass increases, which might result in a delayed effect on the increase of bacterial densities. Neither phosphatase activity nor β;-glucosidase activity exhibited significant changes due to nutrient addition. This may be due to the fact that the phosphatase activities measured were basal activities, uninhibited by enrichment, and that the epipelic β;-glucosidase activity was regulated more by substrate availability than by any nutrient imbalance. Although changes are slow, if some of these changes were to become chronic, they would affect the functioning and services of the whole stream ecosystem.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/85550
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dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0948-3055
info:eu-repo/semantics/altIdentifier/doi/10.3354/ame01630
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
145-155
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institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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