Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event
- Autores
- Mazía, Noemí C.; Chaneton, Enrique J.; Kitzberger, Thomas; Garibaldi, Lucas Alejandro
- Año de publicación
- 2009
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Fil: Mazía, Noemí C. Universidad de Buenos Aires. Facultad de Agronomía; Argentina.
Fil: Chaneton, Enrique J. Universidad de Buenos Aires (UBA). Facultad de Agronomía. IFEVA- CONICET; Argentina.
Fil: Kitzberger, Thomas. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono-CONICET; Argentina.
Fil: Garibaldi, Lucas Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono; Argentina.
Fil: Garibaldi, Lucas Alejandro. Universidad de Buenos Aires. Facultad de Agronomía; Argentina.
Predators are thought to play a key role in controlling herbivory, thus having positive indirect effects on plants. However, evidence for terrestrial trophic cascades is still fragmentary, perhaps due to variation in top-down forces created by environmental heterogeneity. We examined the magnitude of predation effects on foliar damage by chewing insects and mean leaf size, by excluding birds from saplings in ‘dry’ and ‘wet’ Nothofagus pumilio forests in the northern Patagonian Andes, Argentina.The experiment lasted 2 years encompassing a severe drought during the La Niña phase of a strong El Niño/Southern Oscillation event, which was followed by unusually high background folivory levels. Insect damage was consistently higher in wet than in dry forest saplings. In the drought year (1999), bird exclusion increased folivory rates in both forests but did not affect tree leaf size. In the ensuing season (2000), leaf damage was generally twice as high as in the drought year. As a result, bird exclusion not only increased the extent of folivory but also significantly decreased sapling leaf size.The latter effect was stronger in the wet forest, suggesting compensation of leaf area loss by dry forest saplings. Overall, the magnitude of predator indirect effects depended on the response variable measured. Insectivorous birds were more effective at reducing folivory than at facilitating leaf area growth. Our results indicate that bird-initiated trophic cascades protect N. pumilio saplings from insect damage even during years with above-normal herbivory, and also support the view that large-scale climatic events influence the strength of trophic cascades. - Materia
-
Climate Change
Drought
Folivory
Indirect Interactions
Temperate Forest
Trophic Cascade - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de Río Negro
- OAI Identificador
- oai:rid.unrn.edu.ar:20.500.12049/3291
Ver los metadatos del registro completo
id |
RIDUNRN_e7e6e40bb6895d69f04382dc9aaf8c9d |
---|---|
oai_identifier_str |
oai:rid.unrn.edu.ar:20.500.12049/3291 |
network_acronym_str |
RIDUNRN |
repository_id_str |
4369 |
network_name_str |
RID-UNRN (UNRN) |
spelling |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO eventMazía, Noemí C.Chaneton, Enrique J.Kitzberger, ThomasGaribaldi, Lucas AlejandroClimate ChangeDroughtFolivoryIndirect InteractionsTemperate ForestTrophic CascadeFil: Mazía, Noemí C. Universidad de Buenos Aires. Facultad de Agronomía; Argentina.Fil: Chaneton, Enrique J. Universidad de Buenos Aires (UBA). Facultad de Agronomía. IFEVA- CONICET; Argentina.Fil: Kitzberger, Thomas. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono-CONICET; Argentina.Fil: Garibaldi, Lucas Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono; Argentina.Fil: Garibaldi, Lucas Alejandro. Universidad de Buenos Aires. Facultad de Agronomía; Argentina.Predators are thought to play a key role in controlling herbivory, thus having positive indirect effects on plants. However, evidence for terrestrial trophic cascades is still fragmentary, perhaps due to variation in top-down forces created by environmental heterogeneity. We examined the magnitude of predation effects on foliar damage by chewing insects and mean leaf size, by excluding birds from saplings in ‘dry’ and ‘wet’ Nothofagus pumilio forests in the northern Patagonian Andes, Argentina.The experiment lasted 2 years encompassing a severe drought during the La Niña phase of a strong El Niño/Southern Oscillation event, which was followed by unusually high background folivory levels. Insect damage was consistently higher in wet than in dry forest saplings. In the drought year (1999), bird exclusion increased folivory rates in both forests but did not affect tree leaf size. In the ensuing season (2000), leaf damage was generally twice as high as in the drought year. As a result, bird exclusion not only increased the extent of folivory but also significantly decreased sapling leaf size.The latter effect was stronger in the wet forest, suggesting compensation of leaf area loss by dry forest saplings. Overall, the magnitude of predator indirect effects depended on the response variable measured. Insectivorous birds were more effective at reducing folivory than at facilitating leaf area growth. Our results indicate that bird-initiated trophic cascades protect N. pumilio saplings from insect damage even during years with above-normal herbivory, and also support the view that large-scale climatic events influence the strength of trophic cascades.Wiley Online Library2009-05-28info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfMazía, Noemí C., Chaneton, Enrique J., Kitzberger, Thomas & Garibaldi, Lucas A. (2009). Variable strength of top-down effects inNothofagusforests:bird predation and insect herbivory during an ENSO event. Wiley Online Library; Austral Ecology; 34 (4); 359-3671442-99851442-9993https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1442-9993.2009.01933.xhttps://rid.unrn.edu.ar/jspui/handle/20.500.12049/3291https://doi.org/10.1111/j.1442-9993.2009.01933.xeng34Austral Ecologyinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-09-29T14:29:01Zoai:rid.unrn.edu.ar:20.500.12049/3291instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-09-29 14:29:01.841RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse |
dc.title.none.fl_str_mv |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event |
title |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event |
spellingShingle |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event Mazía, Noemí C. Climate Change Drought Folivory Indirect Interactions Temperate Forest Trophic Cascade |
title_short |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event |
title_full |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event |
title_fullStr |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event |
title_full_unstemmed |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event |
title_sort |
Variable strength of top‐down effects in Nothofagus forests: bird predation and insect herbivory during an ENSO event |
dc.creator.none.fl_str_mv |
Mazía, Noemí C. Chaneton, Enrique J. Kitzberger, Thomas Garibaldi, Lucas Alejandro |
author |
Mazía, Noemí C. |
author_facet |
Mazía, Noemí C. Chaneton, Enrique J. Kitzberger, Thomas Garibaldi, Lucas Alejandro |
author_role |
author |
author2 |
Chaneton, Enrique J. Kitzberger, Thomas Garibaldi, Lucas Alejandro |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Climate Change Drought Folivory Indirect Interactions Temperate Forest Trophic Cascade |
topic |
Climate Change Drought Folivory Indirect Interactions Temperate Forest Trophic Cascade |
dc.description.none.fl_txt_mv |
Fil: Mazía, Noemí C. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Fil: Chaneton, Enrique J. Universidad de Buenos Aires (UBA). Facultad de Agronomía. IFEVA- CONICET; Argentina. Fil: Kitzberger, Thomas. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono-CONICET; Argentina. Fil: Garibaldi, Lucas Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio Ecotono; Argentina. Fil: Garibaldi, Lucas Alejandro. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. Predators are thought to play a key role in controlling herbivory, thus having positive indirect effects on plants. However, evidence for terrestrial trophic cascades is still fragmentary, perhaps due to variation in top-down forces created by environmental heterogeneity. We examined the magnitude of predation effects on foliar damage by chewing insects and mean leaf size, by excluding birds from saplings in ‘dry’ and ‘wet’ Nothofagus pumilio forests in the northern Patagonian Andes, Argentina.The experiment lasted 2 years encompassing a severe drought during the La Niña phase of a strong El Niño/Southern Oscillation event, which was followed by unusually high background folivory levels. Insect damage was consistently higher in wet than in dry forest saplings. In the drought year (1999), bird exclusion increased folivory rates in both forests but did not affect tree leaf size. In the ensuing season (2000), leaf damage was generally twice as high as in the drought year. As a result, bird exclusion not only increased the extent of folivory but also significantly decreased sapling leaf size.The latter effect was stronger in the wet forest, suggesting compensation of leaf area loss by dry forest saplings. Overall, the magnitude of predator indirect effects depended on the response variable measured. Insectivorous birds were more effective at reducing folivory than at facilitating leaf area growth. Our results indicate that bird-initiated trophic cascades protect N. pumilio saplings from insect damage even during years with above-normal herbivory, and also support the view that large-scale climatic events influence the strength of trophic cascades. |
description |
Fil: Mazía, Noemí C. Universidad de Buenos Aires. Facultad de Agronomía; Argentina. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-05-28 |
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 |
Mazía, Noemí C., Chaneton, Enrique J., Kitzberger, Thomas & Garibaldi, Lucas A. (2009). Variable strength of top-down effects inNothofagusforests:bird predation and insect herbivory during an ENSO event. Wiley Online Library; Austral Ecology; 34 (4); 359-367 1442-9985 1442-9993 https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1442-9993.2009.01933.x https://rid.unrn.edu.ar/jspui/handle/20.500.12049/3291 https://doi.org/10.1111/j.1442-9993.2009.01933.x |
identifier_str_mv |
Mazía, Noemí C., Chaneton, Enrique J., Kitzberger, Thomas & Garibaldi, Lucas A. (2009). Variable strength of top-down effects inNothofagusforests:bird predation and insect herbivory during an ENSO event. Wiley Online Library; Austral Ecology; 34 (4); 359-367 1442-9985 1442-9993 |
url |
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1442-9993.2009.01933.x https://rid.unrn.edu.ar/jspui/handle/20.500.12049/3291 https://doi.org/10.1111/j.1442-9993.2009.01933.x |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
34 Austral Ecology |
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 |
Wiley Online Library |
publisher.none.fl_str_mv |
Wiley Online Library |
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 |
repository.mail.fl_str_mv |
rid@unrn.edu.ar |
_version_ |
1844621607835795456 |
score |
12.559606 |