Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect

Autores
Villacide, Jose Maria; Liebhold, Andrew M.; Cavigliasso, Pablo; Corley, Juan Carlos
Año de publicación
2026
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Several bark and wood-boring insects exhibit eruptive population dynamics during which declining host vigor triggers rapid insect population growth and widespread tree mortality. The invasive woodwasp Sirex noctilio F. (Hymenoptera: Siricidae) is typically considered a semi-aggressive species due to the absence of aggregation pheromones and a strong dependence on density-independent factors. However, in many parts of its invaded range, S. noctilio displays pronounced outbreaks and spatial aggregation, suggesting more complex population mechanisms. We hypothesized that S. noctilio behaves as an aggressive forest insect in its invaded range, where population dynamics are driven by a combination of both density-independent (host condition) and density-dependent (population density) mechanisms. To test this, we conducted a field experiment in an invaded region, where host susceptibility was manipulated using herbicide-induced stress, and local population density was assessed by selecting plantations with contrasting wasp densities. We jointly investigated the effects of these factors on female host selection and offspring performance. We found that host stress strongly influenced female host selection, whereas local population density had little influence on the probability of attack. In contrast, larval performance was largely unaffected by host stress but exhibited positive density-dependent effects, with more and larger individuals emerging from trees in plantations with higher S. noctilio population densities. These positive density-dependent responses are inherently destabilizing and likely contribute to the pattern of eruptive population dynamics seen in invasive populations of this forest insect.
EEA Bariloche
Fil: Villacide, José. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Villacide, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina; Argentina
Fil: Liebhold, Andrew. Czech University of Life Sciences. Faculty of Forestry and Wood Sciences; República Checa
Fil: Liebhold, Andrew. US Forest Service. Northern Research Station; Estados Unidos
Fil: Cavigliasso, Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Marcos Juárez; Argentina
Fil: Corley, Juan Carlos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Corley, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Corley, Juan Carlos. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Departamento de Ecología; Argentina
Fuente
Journal of Pest Science 99 : article number 3. (2026)
Materia
Plagas Forestales
Dinámica de Poblaciones
Especie Invasiva
Forest Pests
Sirex
Population Dynamics
Invasive Species
Sirex noctilio
Región Patagónica
Nivel de accesibilidad
acceso restringido
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
INTA Digital (INTA)
Institución
Instituto Nacional de Tecnología Agropecuaria
OAI Identificador
oai:localhost:20.500.12123/24919
Acceder
id INTADig_46dd6e46469e0287cd1366b857e05565
oai_identifier_str oai:localhost:20.500.12123/24919
network_acronym_str INTADig
repository_id_str l
network_name_str INTA Digital (INTA)
spelling Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insectVillacide, Jose MariaLiebhold, Andrew M.Cavigliasso, PabloCorley, Juan CarlosPlagas ForestalesDinámica de PoblacionesEspecie InvasivaForest PestsSirexPopulation DynamicsInvasive SpeciesSirex noctilioRegión PatagónicaSeveral bark and wood-boring insects exhibit eruptive population dynamics during which declining host vigor triggers rapid insect population growth and widespread tree mortality. The invasive woodwasp Sirex noctilio F. (Hymenoptera: Siricidae) is typically considered a semi-aggressive species due to the absence of aggregation pheromones and a strong dependence on density-independent factors. However, in many parts of its invaded range, S. noctilio displays pronounced outbreaks and spatial aggregation, suggesting more complex population mechanisms. We hypothesized that S. noctilio behaves as an aggressive forest insect in its invaded range, where population dynamics are driven by a combination of both density-independent (host condition) and density-dependent (population density) mechanisms. To test this, we conducted a field experiment in an invaded region, where host susceptibility was manipulated using herbicide-induced stress, and local population density was assessed by selecting plantations with contrasting wasp densities. We jointly investigated the effects of these factors on female host selection and offspring performance. We found that host stress strongly influenced female host selection, whereas local population density had little influence on the probability of attack. In contrast, larval performance was largely unaffected by host stress but exhibited positive density-dependent effects, with more and larger individuals emerging from trees in plantations with higher S. noctilio population densities. These positive density-dependent responses are inherently destabilizing and likely contribute to the pattern of eruptive population dynamics seen in invasive populations of this forest insect.EEA BarilocheFil: Villacide, José. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; ArgentinaFil: Villacide, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina; ArgentinaFil: Liebhold, Andrew. Czech University of Life Sciences. Faculty of Forestry and Wood Sciences; República ChecaFil: Liebhold, Andrew. US Forest Service. Northern Research Station; Estados UnidosFil: Cavigliasso, Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Marcos Juárez; ArgentinaFil: Corley, Juan Carlos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; ArgentinaFil: Corley, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; ArgentinaFil: Corley, Juan Carlos. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Departamento de Ecología; ArgentinaSpringer2026-01-07T13:06:36Z2026-01-07T13:06:36Z2026-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/24919https://link.springer.com/article/10.1007/s10340-025-02006-w1612-47581612-4766https://doi.org/10.1007/s10340-025-02006-wJournal of Pest Science 99 : article number 3. (2026)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repograntAgreement/INTA/2019-PD-E1-I600-001, Bioecología y estrategias de manejo de organismos perjudiciales y benéficos en escenarios de intensificación sustentable de cultivosinfo:eu-repograntAgreement/INTA/2023-PD-L01-I074, Bases ecológicas y epidemiológicas para el diseño de estrategias de manejo de plagas agrícolas y forestalesinfo:eu-repo/semantics/reference/hdl/20.500.12123/19663info:eu-repo/semantics/restrictedAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)2026-02-05T12:54:26Zoai:localhost:20.500.12123/24919instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2026-02-05 12:54:27.145INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse
dc.title.none.fl_str_mv Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
title Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
spellingShingle Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
Villacide, Jose Maria
Plagas Forestales
Dinámica de Poblaciones
Especie Invasiva
Forest Pests
Sirex
Population Dynamics
Invasive Species
Sirex noctilio
Región Patagónica
title_short Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
title_full Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
title_fullStr Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
title_full_unstemmed Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
title_sort Density-dependent and density-independent effects on outbreak dynamics in an invasive forest insect
dc.creator.none.fl_str_mv Villacide, Jose Maria
Liebhold, Andrew M.
Cavigliasso, Pablo
Corley, Juan Carlos
author Villacide, Jose Maria
author_facet Villacide, Jose Maria
Liebhold, Andrew M.
Cavigliasso, Pablo
Corley, Juan Carlos
author_role author
author2 Liebhold, Andrew M.
Cavigliasso, Pablo
Corley, Juan Carlos
author2_role author
author
author
dc.subject.none.fl_str_mv Plagas Forestales
Dinámica de Poblaciones
Especie Invasiva
Forest Pests
Sirex
Population Dynamics
Invasive Species
Sirex noctilio
Región Patagónica
topic Plagas Forestales
Dinámica de Poblaciones
Especie Invasiva
Forest Pests
Sirex
Population Dynamics
Invasive Species
Sirex noctilio
Región Patagónica
dc.description.none.fl_txt_mv Several bark and wood-boring insects exhibit eruptive population dynamics during which declining host vigor triggers rapid insect population growth and widespread tree mortality. The invasive woodwasp Sirex noctilio F. (Hymenoptera: Siricidae) is typically considered a semi-aggressive species due to the absence of aggregation pheromones and a strong dependence on density-independent factors. However, in many parts of its invaded range, S. noctilio displays pronounced outbreaks and spatial aggregation, suggesting more complex population mechanisms. We hypothesized that S. noctilio behaves as an aggressive forest insect in its invaded range, where population dynamics are driven by a combination of both density-independent (host condition) and density-dependent (population density) mechanisms. To test this, we conducted a field experiment in an invaded region, where host susceptibility was manipulated using herbicide-induced stress, and local population density was assessed by selecting plantations with contrasting wasp densities. We jointly investigated the effects of these factors on female host selection and offspring performance. We found that host stress strongly influenced female host selection, whereas local population density had little influence on the probability of attack. In contrast, larval performance was largely unaffected by host stress but exhibited positive density-dependent effects, with more and larger individuals emerging from trees in plantations with higher S. noctilio population densities. These positive density-dependent responses are inherently destabilizing and likely contribute to the pattern of eruptive population dynamics seen in invasive populations of this forest insect.
EEA Bariloche
Fil: Villacide, José. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Villacide, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina; Argentina
Fil: Liebhold, Andrew. Czech University of Life Sciences. Faculty of Forestry and Wood Sciences; República Checa
Fil: Liebhold, Andrew. US Forest Service. Northern Research Station; Estados Unidos
Fil: Cavigliasso, Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Marcos Juárez; Argentina
Fil: Corley, Juan Carlos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Corley, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB). Grupo de Ecología de Poblaciones de Insectos; Argentina
Fil: Corley, Juan Carlos. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Departamento de Ecología; Argentina
description Several bark and wood-boring insects exhibit eruptive population dynamics during which declining host vigor triggers rapid insect population growth and widespread tree mortality. The invasive woodwasp Sirex noctilio F. (Hymenoptera: Siricidae) is typically considered a semi-aggressive species due to the absence of aggregation pheromones and a strong dependence on density-independent factors. However, in many parts of its invaded range, S. noctilio displays pronounced outbreaks and spatial aggregation, suggesting more complex population mechanisms. We hypothesized that S. noctilio behaves as an aggressive forest insect in its invaded range, where population dynamics are driven by a combination of both density-independent (host condition) and density-dependent (population density) mechanisms. To test this, we conducted a field experiment in an invaded region, where host susceptibility was manipulated using herbicide-induced stress, and local population density was assessed by selecting plantations with contrasting wasp densities. We jointly investigated the effects of these factors on female host selection and offspring performance. We found that host stress strongly influenced female host selection, whereas local population density had little influence on the probability of attack. In contrast, larval performance was largely unaffected by host stress but exhibited positive density-dependent effects, with more and larger individuals emerging from trees in plantations with higher S. noctilio population densities. These positive density-dependent responses are inherently destabilizing and likely contribute to the pattern of eruptive population dynamics seen in invasive populations of this forest insect.
publishDate 2026
dc.date.none.fl_str_mv 2026-01-07T13:06:36Z
2026-01-07T13:06:36Z
2026-01
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 http://hdl.handle.net/20.500.12123/24919
https://link.springer.com/article/10.1007/s10340-025-02006-w
1612-4758
1612-4766
https://doi.org/10.1007/s10340-025-02006-w
url http://hdl.handle.net/20.500.12123/24919
https://link.springer.com/article/10.1007/s10340-025-02006-w
https://doi.org/10.1007/s10340-025-02006-w
identifier_str_mv 1612-4758
1612-4766
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repograntAgreement/INTA/2019-PD-E1-I600-001, Bioecología y estrategias de manejo de organismos perjudiciales y benéficos en escenarios de intensificación sustentable de cultivos
info:eu-repograntAgreement/INTA/2023-PD-L01-I074, Bases ecológicas y epidemiológicas para el diseño de estrategias de manejo de plagas agrícolas y forestales
info:eu-repo/semantics/reference/hdl/20.500.12123/19663
dc.rights.none.fl_str_mv info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv restrictedAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv Journal of Pest Science 99 : article number 3. (2026)
reponame:INTA Digital (INTA)
instname:Instituto Nacional de Tecnología Agropecuaria
reponame_str INTA Digital (INTA)
collection INTA Digital (INTA)
instname_str Instituto Nacional de Tecnología Agropecuaria
repository.name.fl_str_mv INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuaria
repository.mail.fl_str_mv tripaldi.nicolas@inta.gob.ar
_version_ 1856302448521510912
score 13.115731

Publicaciones similares