Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes

Autores
Rodriguez, María Victoria; Marino, Andrea Ivana; Borrelli, Laura Beatriz; Bay Gavuzzo, Alhue; Pazos, Gustavo Enrique
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The optimal foraging theory postulates that as animal population density increases, the progressive decline in preferred forage availability results in changes in diet composition and widening of dietary niche breadth. For sedentary guanaco populations, some authors proposed a mechanism of population density limitation below the environmental carrying capacity, mediated through territoriality. Under the optimal foraging theory, increased density would lead to changes in guanaco diet selectivity and composition. Conversely, under the self-regulation hypothesis, guanacos would not affect preferred forage availability and no differences in guanaco diet would be expected. We tested these contrasting hypotheses by assessing both the differences in the proportion of grasses and shrubs present in guanaco diet and dietary niche breadth at three contrasting densities in northeastern Patagonian steppes. We did not find guanaco density effects on preferred forage availability, grass-shrub proportions in the diet and diet selectivity. Guanacos showed a mixed diet composed by plant species of both high and low nutritional quality independently of population density. The lack of changes in diet composition suggests that guanacos did not perceive a restriction in forage availability in terms of either biomass or nutritional content, regardless the observed increase in population density.
Estación Experimental Agropecuaria Bariloche
Fil: Rodriguez, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Fil: Marino, Andrea Ivana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Fil: Borrelli, Laura Beatriz. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
Fil: Bay Gavuzzo, Alhue. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
Fil: Pazos, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales. Universidad Nacional de la Patagonia San Juan Bosco; Argentina
Fuente
Journal of Arid Environments 170 : 104000 (November 2019)
Materia
Guanaco
Nutrición Animal
Preferencias Alimentarias
Densidad de la Población
Herbívoros
Guanacos
Animal Nutrition
Feeding Preferences
Population Density
Herbivores
Preferencia de Forrajes
Región Patagónica
Nivel de accesibilidad
acceso restringido
Condiciones de uso
Repositorio
INTA Digital (INTA)
Institución
Instituto Nacional de Tecnología Agropecuaria
OAI Identificador
oai:localhost:20.500.12123/6512
Acceder
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oai_identifier_str oai:localhost:20.500.12123/6512
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network_name_str INTA Digital (INTA)
spelling Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppesRodriguez, María VictoriaMarino, Andrea IvanaBorrelli, Laura BeatrizBay Gavuzzo, AlhuePazos, Gustavo EnriqueGuanacoNutrición AnimalPreferencias AlimentariasDensidad de la PoblaciónHerbívorosGuanacosAnimal NutritionFeeding PreferencesPopulation DensityHerbivoresPreferencia de ForrajesRegión PatagónicaThe optimal foraging theory postulates that as animal population density increases, the progressive decline in preferred forage availability results in changes in diet composition and widening of dietary niche breadth. For sedentary guanaco populations, some authors proposed a mechanism of population density limitation below the environmental carrying capacity, mediated through territoriality. Under the optimal foraging theory, increased density would lead to changes in guanaco diet selectivity and composition. Conversely, under the self-regulation hypothesis, guanacos would not affect preferred forage availability and no differences in guanaco diet would be expected. We tested these contrasting hypotheses by assessing both the differences in the proportion of grasses and shrubs present in guanaco diet and dietary niche breadth at three contrasting densities in northeastern Patagonian steppes. We did not find guanaco density effects on preferred forage availability, grass-shrub proportions in the diet and diet selectivity. Guanacos showed a mixed diet composed by plant species of both high and low nutritional quality independently of population density. The lack of changes in diet composition suggests that guanacos did not perceive a restriction in forage availability in terms of either biomass or nutritional content, regardless the observed increase in population density.Estación Experimental Agropecuaria BarilocheFil: Rodriguez, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; ArgentinaFil: Marino, Andrea Ivana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; ArgentinaFil: Borrelli, Laura Beatriz. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; ArgentinaFil: Bay Gavuzzo, Alhue. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; ArgentinaFil: Pazos, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales. Universidad Nacional de la Patagonia San Juan Bosco; ArgentinaElsevier2019-12-13T17:46:27Z2019-12-13T17:46:27Z2019-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/6512https://www.sciencedirect.com/science/article/pii/S01401963183076750140-1963https://doi.org/10.1016/j.jaridenv.2019.104000Journal of Arid Environments 170 : 104000 (November 2019)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repo/semantics/restrictedAccess2025-09-29T13:44:51Zoai:localhost:20.500.12123/6512instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2025-09-29 13:44:51.46INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse
dc.title.none.fl_str_mv Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
title Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
spellingShingle Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
Rodriguez, María Victoria
Guanaco
Nutrición Animal
Preferencias Alimentarias
Densidad de la Población
Herbívoros
Guanacos
Animal Nutrition
Feeding Preferences
Population Density
Herbivores
Preferencia de Forrajes
Región Patagónica
title_short Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
title_full Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
title_fullStr Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
title_full_unstemmed Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
title_sort Effect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppes
dc.creator.none.fl_str_mv Rodriguez, María Victoria
Marino, Andrea Ivana
Borrelli, Laura Beatriz
Bay Gavuzzo, Alhue
Pazos, Gustavo Enrique
author Rodriguez, María Victoria
author_facet Rodriguez, María Victoria
Marino, Andrea Ivana
Borrelli, Laura Beatriz
Bay Gavuzzo, Alhue
Pazos, Gustavo Enrique
author_role author
author2 Marino, Andrea Ivana
Borrelli, Laura Beatriz
Bay Gavuzzo, Alhue
Pazos, Gustavo Enrique
author2_role author
author
author
author
dc.subject.none.fl_str_mv Guanaco
Nutrición Animal
Preferencias Alimentarias
Densidad de la Población
Herbívoros
Guanacos
Animal Nutrition
Feeding Preferences
Population Density
Herbivores
Preferencia de Forrajes
Región Patagónica
topic Guanaco
Nutrición Animal
Preferencias Alimentarias
Densidad de la Población
Herbívoros
Guanacos
Animal Nutrition
Feeding Preferences
Population Density
Herbivores
Preferencia de Forrajes
Región Patagónica
dc.description.none.fl_txt_mv The optimal foraging theory postulates that as animal population density increases, the progressive decline in preferred forage availability results in changes in diet composition and widening of dietary niche breadth. For sedentary guanaco populations, some authors proposed a mechanism of population density limitation below the environmental carrying capacity, mediated through territoriality. Under the optimal foraging theory, increased density would lead to changes in guanaco diet selectivity and composition. Conversely, under the self-regulation hypothesis, guanacos would not affect preferred forage availability and no differences in guanaco diet would be expected. We tested these contrasting hypotheses by assessing both the differences in the proportion of grasses and shrubs present in guanaco diet and dietary niche breadth at three contrasting densities in northeastern Patagonian steppes. We did not find guanaco density effects on preferred forage availability, grass-shrub proportions in the diet and diet selectivity. Guanacos showed a mixed diet composed by plant species of both high and low nutritional quality independently of population density. The lack of changes in diet composition suggests that guanacos did not perceive a restriction in forage availability in terms of either biomass or nutritional content, regardless the observed increase in population density.
Estación Experimental Agropecuaria Bariloche
Fil: Rodriguez, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Fil: Marino, Andrea Ivana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Fil: Borrelli, Laura Beatriz. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
Fil: Bay Gavuzzo, Alhue. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
Fil: Pazos, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales. Universidad Nacional de la Patagonia San Juan Bosco; Argentina
description The optimal foraging theory postulates that as animal population density increases, the progressive decline in preferred forage availability results in changes in diet composition and widening of dietary niche breadth. For sedentary guanaco populations, some authors proposed a mechanism of population density limitation below the environmental carrying capacity, mediated through territoriality. Under the optimal foraging theory, increased density would lead to changes in guanaco diet selectivity and composition. Conversely, under the self-regulation hypothesis, guanacos would not affect preferred forage availability and no differences in guanaco diet would be expected. We tested these contrasting hypotheses by assessing both the differences in the proportion of grasses and shrubs present in guanaco diet and dietary niche breadth at three contrasting densities in northeastern Patagonian steppes. We did not find guanaco density effects on preferred forage availability, grass-shrub proportions in the diet and diet selectivity. Guanacos showed a mixed diet composed by plant species of both high and low nutritional quality independently of population density. The lack of changes in diet composition suggests that guanacos did not perceive a restriction in forage availability in terms of either biomass or nutritional content, regardless the observed increase in population density.
publishDate 2019
dc.date.none.fl_str_mv 2019-12-13T17:46:27Z
2019-12-13T17:46:27Z
2019-11
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/20.500.12123/6512
https://www.sciencedirect.com/science/article/pii/S0140196318307675
0140-1963
https://doi.org/10.1016/j.jaridenv.2019.104000
url http://hdl.handle.net/20.500.12123/6512
https://www.sciencedirect.com/science/article/pii/S0140196318307675
https://doi.org/10.1016/j.jaridenv.2019.104000
identifier_str_mv 0140-1963
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/restrictedAccess
eu_rights_str_mv restrictedAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv Journal of Arid Environments 170 : 104000 (November 2019)
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_ 1844619140532273152
score 12.559606

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