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

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 r...

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Detalles Bibliográficos
Autores principales: Cochero, Joaquín, Romaní, Anna M., Gómez, Nora
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85550
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85550
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
spellingShingle Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
Cochero, Joaquín
Romaní, Anna M.
Gómez, Nora
Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
topic_facet Ciencias Naturales
β-glucosidase
Bacterial biomass
Epipelon
Phosphatase
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.
format Articulo
Articulo
author Cochero, Joaquín
Romaní, Anna M.
Gómez, Nora
author_facet Cochero, Joaquín
Romaní, Anna M.
Gómez, Nora
author_sort Cochero, Joaquín
title Delayed response of microbial epipelic biofilm to nutrient addition in a Pampean stream
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
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85550
work_keys_str_mv AT cocherojoaquin delayedresponseofmicrobialepipelicbiofilmtonutrientadditioninapampeanstream
AT romaniannam delayedresponseofmicrobialepipelicbiofilmtonutrientadditioninapampeanstream
AT gomeznora delayedresponseofmicrobialepipelicbiofilmtonutrientadditioninapampeanstream
bdutipo_str Repositorios
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