Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats

Autores
Garibaldi, Lucas Alejandro; Kitzberger, Thomas; Mazía, Noemí C.; Chaneton, Enrique J.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Garibaldi, Lucas Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono; Argentina.
Fil: Kitzberger, Thomas. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche y INIBIOMA-oCONICET. Laboratorio Ecoton; Argentina.
Fil: Mazía, Noemí C. Universidad de Buenos Aires (UBA). Facultad de Agronomía; Argentina.
Fil: Chaneton, Enrique J. Universidad de Buenos Aires (UBA). Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA)-CONICET; Argentina.
Fil: Garibaldi, Lucas Alejandro. Universidad de Buenos Aires (UBA). Facultad de Agronomía; Argentina.
It has been suggested that bottom–up and top–down forces interactively control food web dynamics. While top–down effects would increase with resource availability to plants, bottom–up effects would be stronger under low predator abundance. These predictions, however, have rarely been tested at contrasting sites while keeping the dominant plant species unchanged. Furthermore, few studies have factorially manipulated both types of forces in forest communities. For two years, we evaluated the effects of fertiliser (NPK) addition and bird exclusion on tree growth, leaf traits, insect abundance, and folivory rates in a dry/warm and a wet/cold Nothofagus pumilio forest in Patagonia, Argentina. Overall, we found no interaction between nutrient supply and bird predation, although the strength of bottom–up and top–down forces differed markedly between forest sites. Treatment effects were generally weak in the wet forest, where tree growth rates and insect herbivory were low relative to the dry forest. In the dry forest, fertilisation increased sapling growth, insect abundance and folivory, whereas bird exclusion increased leaf damage and reduced tree growth. In the wet forest, fertilisation enhanced leaf nutrient contents and folivore abundance but not sapling growth, while bird exclusion had little impact on insects or trees. These results imply that factors other than nutrients and birds were important in controlling tree growth and folivore activity in the wet forest. While treatment effect sizes varied widely among feeding guilds, in general, nutrient effects on folivores were stronger than predator effects. We conclude that, within the time‐frame of this study, tree growth and herbivory were additively affected by soil nutrients and predator presence, as bird exclusion effects did not change with elevated folivore activity on fertilised trees. We also show that both top–down and bottom–up cascades were weaker in a forest site characterised by slow‐growing juvenile trees subjected to low folivore pressure.
Materia
Nutrient Supply
Bird Predation
Insect Herbivory
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/3293

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spelling Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitatsGaribaldi, Lucas AlejandroKitzberger, ThomasMazía, Noemí C.Chaneton, Enrique J.Nutrient SupplyBird PredationInsect HerbivoryFil: Garibaldi, Lucas Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono; Argentina.Fil: Kitzberger, Thomas. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche y INIBIOMA-oCONICET. Laboratorio Ecoton; Argentina.Fil: Mazía, Noemí C. Universidad de Buenos Aires (UBA). Facultad de Agronomía; Argentina.Fil: Chaneton, Enrique J. Universidad de Buenos Aires (UBA). Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA)-CONICET; Argentina.Fil: Garibaldi, Lucas Alejandro. Universidad de Buenos Aires (UBA). Facultad de Agronomía; Argentina.It has been suggested that bottom–up and top–down forces interactively control food web dynamics. While top–down effects would increase with resource availability to plants, bottom–up effects would be stronger under low predator abundance. These predictions, however, have rarely been tested at contrasting sites while keeping the dominant plant species unchanged. Furthermore, few studies have factorially manipulated both types of forces in forest communities. For two years, we evaluated the effects of fertiliser (NPK) addition and bird exclusion on tree growth, leaf traits, insect abundance, and folivory rates in a dry/warm and a wet/cold Nothofagus pumilio forest in Patagonia, Argentina. Overall, we found no interaction between nutrient supply and bird predation, although the strength of bottom–up and top–down forces differed markedly between forest sites. Treatment effects were generally weak in the wet forest, where tree growth rates and insect herbivory were low relative to the dry forest. In the dry forest, fertilisation increased sapling growth, insect abundance and folivory, whereas bird exclusion increased leaf damage and reduced tree growth. In the wet forest, fertilisation enhanced leaf nutrient contents and folivore abundance but not sapling growth, while bird exclusion had little impact on insects or trees. These results imply that factors other than nutrients and birds were important in controlling tree growth and folivore activity in the wet forest. While treatment effect sizes varied widely among feeding guilds, in general, nutrient effects on folivores were stronger than predator effects. We conclude that, within the time‐frame of this study, tree growth and herbivory were additively affected by soil nutrients and predator presence, as bird exclusion effects did not change with elevated folivore activity on fertilised trees. We also show that both top–down and bottom–up cascades were weaker in a forest site characterised by slow‐growing juvenile trees subjected to low folivore pressure.John Wiley & Sons Ltd2010-02-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfGaribaldi, Lucas A., Kitzberger, Thomas., Mazía, Noemi C. & Chaneton, Enrique J. (2010). Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats. John Wiley & Sons Ltd. Oikos; 119 (2); 337-3491600-07060030-1299https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0706.2009.17862.xhttps://rid.unrn.edu.ar/jspui/handle/20.500.12049/329310.1111/j.1600-0706.2009.17862.xeng119Oikosinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-10-16T10:06:01Zoai:rid.unrn.edu.ar:20.500.12049/3293instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-10-16 10:06:02.093RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse
dc.title.none.fl_str_mv Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
title Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
spellingShingle Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
Garibaldi, Lucas Alejandro
Nutrient Supply
Bird Predation
Insect Herbivory
title_short Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
title_full Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
title_fullStr Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
title_full_unstemmed Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
title_sort Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats
dc.creator.none.fl_str_mv Garibaldi, Lucas Alejandro
Kitzberger, Thomas
Mazía, Noemí C.
Chaneton, Enrique J.
author Garibaldi, Lucas Alejandro
author_facet Garibaldi, Lucas Alejandro
Kitzberger, Thomas
Mazía, Noemí C.
Chaneton, Enrique J.
author_role author
author2 Kitzberger, Thomas
Mazía, Noemí C.
Chaneton, Enrique J.
author2_role author
author
author
dc.subject.none.fl_str_mv Nutrient Supply
Bird Predation
Insect Herbivory
topic Nutrient Supply
Bird Predation
Insect Herbivory
dc.description.none.fl_txt_mv Fil: Garibaldi, Lucas Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono; Argentina.
Fil: Kitzberger, Thomas. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche y INIBIOMA-oCONICET. Laboratorio Ecoton; Argentina.
Fil: Mazía, Noemí C. Universidad de Buenos Aires (UBA). Facultad de Agronomía; Argentina.
Fil: Chaneton, Enrique J. Universidad de Buenos Aires (UBA). Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA)-CONICET; Argentina.
Fil: Garibaldi, Lucas Alejandro. Universidad de Buenos Aires (UBA). Facultad de Agronomía; Argentina.
It has been suggested that bottom–up and top–down forces interactively control food web dynamics. While top–down effects would increase with resource availability to plants, bottom–up effects would be stronger under low predator abundance. These predictions, however, have rarely been tested at contrasting sites while keeping the dominant plant species unchanged. Furthermore, few studies have factorially manipulated both types of forces in forest communities. For two years, we evaluated the effects of fertiliser (NPK) addition and bird exclusion on tree growth, leaf traits, insect abundance, and folivory rates in a dry/warm and a wet/cold Nothofagus pumilio forest in Patagonia, Argentina. Overall, we found no interaction between nutrient supply and bird predation, although the strength of bottom–up and top–down forces differed markedly between forest sites. Treatment effects were generally weak in the wet forest, where tree growth rates and insect herbivory were low relative to the dry forest. In the dry forest, fertilisation increased sapling growth, insect abundance and folivory, whereas bird exclusion increased leaf damage and reduced tree growth. In the wet forest, fertilisation enhanced leaf nutrient contents and folivore abundance but not sapling growth, while bird exclusion had little impact on insects or trees. These results imply that factors other than nutrients and birds were important in controlling tree growth and folivore activity in the wet forest. While treatment effect sizes varied widely among feeding guilds, in general, nutrient effects on folivores were stronger than predator effects. We conclude that, within the time‐frame of this study, tree growth and herbivory were additively affected by soil nutrients and predator presence, as bird exclusion effects did not change with elevated folivore activity on fertilised trees. We also show that both top–down and bottom–up cascades were weaker in a forest site characterised by slow‐growing juvenile trees subjected to low folivore pressure.
description Fil: Garibaldi, Lucas Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono; Argentina.
publishDate 2010
dc.date.none.fl_str_mv 2010-02-16
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv Garibaldi, Lucas A., Kitzberger, Thomas., Mazía, Noemi C. & Chaneton, Enrique J. (2010). Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats. John Wiley & Sons Ltd. Oikos; 119 (2); 337-349
1600-0706
0030-1299
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0706.2009.17862.x
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/3293
10.1111/j.1600-0706.2009.17862.x
identifier_str_mv Garibaldi, Lucas A., Kitzberger, Thomas., Mazía, Noemi C. & Chaneton, Enrique J. (2010). Nutrient supply and bird predation additively control insect herbivory and tree growth in two contrasting forest habitats. John Wiley & Sons Ltd. Oikos; 119 (2); 337-349
1600-0706
0030-1299
10.1111/j.1600-0706.2009.17862.x
url https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0706.2009.17862.x
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/3293
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 119
Oikos
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons Ltd
publisher.none.fl_str_mv John Wiley & Sons Ltd
dc.source.none.fl_str_mv reponame:RID-UNRN (UNRN)
instname:Universidad Nacional de Río Negro
reponame_str RID-UNRN (UNRN)
collection RID-UNRN (UNRN)
instname_str Universidad Nacional de Río Negro
repository.name.fl_str_mv RID-UNRN (UNRN) - Universidad Nacional de Río Negro
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