Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina

We analyzed the diatom assemblages inhabiting the epipelic biofilm of a Pampean stream, characterized by their high basal nutrient levels, when exposed to a continuous surplus of inorganic nutrients. An in situ experience was conducted, increasing concentrations of N and P in water 3-fold from the b...

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Detalles Bibliográficos
Autores principales: Licursi, Magdalena, Gómez, Nora, Sabater, Sergi
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Biología
Epipelic diatoms
Nutrient enrichment
Pampean stream
Density
Diversity
Nitzschia proportion
Growth forms
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/136293
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-136293
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Epipelic diatoms
Nutrient enrichment
Pampean stream
Density
Diversity
Nitzschia proportion
Growth forms
spellingShingle Biología
Epipelic diatoms
Nutrient enrichment
Pampean stream
Density
Diversity
Nitzschia proportion
Growth forms
Licursi, Magdalena
Gómez, Nora
Sabater, Sergi
Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina
topic_facet Biología
Epipelic diatoms
Nutrient enrichment
Pampean stream
Density
Diversity
Nitzschia proportion
Growth forms
description We analyzed the diatom assemblages inhabiting the epipelic biofilm of a Pampean stream, characterized by their high basal nutrient levels, when exposed to a continuous surplus of inorganic nutrients. An in situ experience was conducted, increasing concentrations of N and P in water 3-fold from the basal concentration. Nutrient enrichment was achieved by the use of fertilizer bags distributed along the reach. The period of exposure was of 14 months. The effects of nutrient enrichment were analyzed following a BACIPS ANOVA design. The changes in nutrient concentration were associated with a significant increase in diatom density and a decrease in species richness and diversity. The additional nutrient load also caused the change in the diatom taxa proportion, favoring motile forms, Nitzschia species mainly. The fertilization in La Choza, caused a mild to moderate effect, indeed not immediate, on the diatom assemblage. These delayed responses of moderate intensity could be related with intrinsic characteristics of diatom assemblages pre-adapted to nutrient-rich environments. The rising urbanization and agricultural activity in the Pampean plain, may seriously impair the biodiversity of its rivers if the entrance of nutrients to these ecosystems is not mitigated.
format Articulo
Articulo
author Licursi, Magdalena
Gómez, Nora
Sabater, Sergi
author_facet Licursi, Magdalena
Gómez, Nora
Sabater, Sergi
author_sort Licursi, Magdalena
title Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina
title_short Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina
title_full Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina
title_fullStr Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina
title_full_unstemmed Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina
title_sort effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, pampa region, argentina
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/136293
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AT gomeznora effectsofnutrientenrichmentonepipelicdiatomassemblagesinanutrientrichlowlandstreampamparegionargentina
AT sabatersergi effectsofnutrientenrichmentonepipelicdiatomassemblagesinanutrientrichlowlandstreampamparegionargentina
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