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Erratum: Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes

We assessed the effects of nutrient enrichment on three stream ecosystems running through distinct biomes (Mediterranean, Pampean and Andean). We increased the concentrations of N and P in the stream water 1.6–4-fold following a before–after control–impact paired series (BACIPS) design in each stream, and evaluated changes in the biomass of bacteria, primary producers, invertebrates and fish in the enriched (E) versus control (C) reaches after nutrient addition through a predictive-BACIPS approach. The treatment produced variable biomass responses (2–77% of explained variance) among biological communities and streams. The greatest biomass response was observed for algae in the Andean stream (77% of the variance), although fish also showed important biomass responses (about 9–48%). The strongest biomass response to enrichment (77% in all biological compartments) was found in the Andean stream. The magnitude and seasonality of biomass responses to enrichment were highly site specific, often depending on the basal nutrient concentration and on windows of ecological opportunity (periods when environmental constraints other than nutrients do not limit biomass growth). The Pampean stream, with high basal nutrient concentrations, showed a weak response to enrichment (except for invertebrates), whereas the greater responses of Andean stream communities were presumably favored by wider windows of ecological opportunity in comparison to those from the Mediterranean stream. Despite variation among sites, enrichment globally stimulated the algal-based food webs (algae and invertebrate grazers) but not the detritus-based food webs (bacteria and invertebrate shredders). This study shows that nutrient enrichment tends to globally enhance the biomass of stream biological assemblages, but that its magnitude and extent within the food web are complex and are strongly determined by environmental factors and ecosystem structure

Environmental Research Letters, 2013, vol. 8, núm. 1, p. 019601

http://hdl.handle.net/10256/7522

IOP Science

Autor: Artigas Alejo, Joan
García-Berthou, Emili
Bauer, Delia E.
Castro, Maria I.
Cochero, Joaquin
Colautti, Darío C.
Cortelezzi, Agustina
Donato, Jhon Charles
Elosegi, Arturo
Feijóo, Claudia
Giorgi, Adonis
Gómez, Nora
Leggieri, Leonardo
Muñoz Gràcia, Isabel
Rodrigues-Capítulo, Alberto
Romaní i Cornet, Anna M.
Sabater, Sergi
Data: 25 gener 2013
Resum: We assessed the effects of nutrient enrichment on three stream ecosystems running through distinct biomes (Mediterranean, Pampean and Andean). We increased the concentrations of N and P in the stream water 1.6–4-fold following a before–after control–impact paired series (BACIPS) design in each stream, and evaluated changes in the biomass of bacteria, primary producers, invertebrates and fish in the enriched (E) versus control (C) reaches after nutrient addition through a predictive-BACIPS approach. The treatment produced variable biomass responses (2–77% of explained variance) among biological communities and streams. The greatest biomass response was observed for algae in the Andean stream (77% of the variance), although fish also showed important biomass responses (about 9–48%). The strongest biomass response to enrichment (77% in all biological compartments) was found in the Andean stream. The magnitude and seasonality of biomass responses to enrichment were highly site specific, often depending on the basal nutrient concentration and on windows of ecological opportunity (periods when environmental constraints other than nutrients do not limit biomass growth). The Pampean stream, with high basal nutrient concentrations, showed a weak response to enrichment (except for invertebrates), whereas the greater responses of Andean stream communities were presumably favored by wider windows of ecological opportunity in comparison to those from the Mediterranean stream. Despite variation among sites, enrichment globally stimulated the algal-based food webs (algae and invertebrate grazers) but not the detritus-based food webs (bacteria and invertebrate shredders). This study shows that nutrient enrichment tends to globally enhance the biomass of stream biological assemblages, but that its magnitude and extent within the food web are complex and are strongly determined by environmental factors and ecosystem structure
Format: application/pdf
ISSN: 1748-9326
Accés al document: http://hdl.handle.net/10256/7523
Llenguatge: eng
Editor: IOP Science
Col·lecció: Reproducció digital del document publicat a: http://dx.doi.org/10.1088/1748-9326/8/1/019601
Articles publicats (D-CCAA)
És part de: Environmental Research Letters, 2013, vol. 8, núm. 1, p. 019601
Vegeu també: http://hdl.handle.net/10256/7522
Drets: Attribution 3.0 Spain
URI Drets: http://creativecommons.org/licenses/by/3.0/es/
Matèria: Biomassa
Biomass
Ecologia fluvial
Stream ecology
Títol: Erratum: Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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