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 strea...
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| Autores principales: | , , , , , , , , , , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2013
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/98999 https://ri.conicet.gov.ar/11336/18466 http://iopscience.iop.org/article/10.1088/1748-9326/8/1/014002/meta |
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I19-R120-10915-98999 |
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dspace |
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Universidad Nacional de La Plata |
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I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Zoología Biomes Fish Invertebrates Microbial biomass Nutrient enrichment Stream ecosystems Windows of opportunity |
| spellingShingle |
Zoología Biomes Fish Invertebrates Microbial biomass Nutrient enrichment Stream ecosystems Windows of opportunity Artigas, Joan García Berthou, Emili Bauer, Delia Elena Castro, María I. Cochero, Joaquín Colautti, Darío César Cortelezzi, Agustina Donato, John C. Elosegi, Arturo Feijoó, Claudia Silvina Giorgi, Adonis David Nazareno Gómez, Nora Leggieri, Leonardo Ramón Muñoz, Isabel Rodrigues Capítulo, Alberto Romaní, Anna M. Sabater Cortés, Sergi Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes |
| topic_facet |
Zoología Biomes Fish Invertebrates Microbial biomass Nutrient enrichment Stream ecosystems Windows of opportunity |
| description |
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 |
Articulo Articulo |
| author |
Artigas, Joan García Berthou, Emili Bauer, Delia Elena Castro, María I. Cochero, Joaquín Colautti, Darío César Cortelezzi, Agustina Donato, John C. Elosegi, Arturo Feijoó, Claudia Silvina Giorgi, Adonis David Nazareno Gómez, Nora Leggieri, Leonardo Ramón Muñoz, Isabel Rodrigues Capítulo, Alberto Romaní, Anna M. Sabater Cortés, Sergi |
| author_facet |
Artigas, Joan García Berthou, Emili Bauer, Delia Elena Castro, María I. Cochero, Joaquín Colautti, Darío César Cortelezzi, Agustina Donato, John C. Elosegi, Arturo Feijoó, Claudia Silvina Giorgi, Adonis David Nazareno Gómez, Nora Leggieri, Leonardo Ramón Muñoz, Isabel Rodrigues Capítulo, Alberto Romaní, Anna M. Sabater Cortés, Sergi |
| author_sort |
Artigas, Joan |
| title |
Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes |
| title_short |
Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes |
| title_full |
Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes |
| title_fullStr |
Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes |
| title_full_unstemmed |
Global pressures, specific responses: effects of nutrient enrichment in streams from different biomes |
| title_sort |
global pressures, specific responses: effects of nutrient enrichment in streams from different biomes |
| publishDate |
2013 |
| url |
http://sedici.unlp.edu.ar/handle/10915/98999 https://ri.conicet.gov.ar/11336/18466 http://iopscience.iop.org/article/10.1088/1748-9326/8/1/014002/meta |
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