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Abstract
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 [ver mas...]
dc.contributor.authorRodriguez, María Victoria
dc.contributor.authorMarino, Andrea Ivana
dc.contributor.authorBorrelli, Laura Beatriz
dc.contributor.authorBay Gavuzzo, Alhue
dc.contributor.authorPazos, Gustavo Enrique
dc.date.accessioned2019-12-13T17:46:27Z
dc.date.available2019-12-13T17:46:27Z
dc.date.issued2019-11
dc.identifier.issn0140-1963
dc.identifier.otherhttps://doi.org/10.1016/j.jaridenv.2019.104000
dc.identifier.urihttp://hdl.handle.net/20.500.12123/6512
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0140196318307675
dc.description.abstractThe 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.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherElsevieres_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceJournal of Arid Environments 170 : 104000 (November 2019)es_AR
dc.subjectGuanacoes_AR
dc.subjectGuanacoseng
dc.subjectNutrición Animales_AR
dc.subjectAnimal Nutritioneng
dc.subjectPreferencias Alimentariases_AR
dc.subjectFeeding Preferenceseng
dc.subjectDensidad de la Poblaciónes_AR
dc.subjectPopulation Densityeng
dc.subjectHerbívoroses_AR
dc.subjectHerbivoreseng
dc.subject.otherPreferencia de Forrajeses_AR
dc.subject.otherRegión Patagónica
dc.titleEffect of population density on diet composition and dietary niche breadth of guanaco (Lama guanicoe, Müller 1776) in northeastern Patagonian steppeses_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEstación Experimental Agropecuaria Barilochees_AR
dc.description.filFil: Rodriguez, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentinaes_AR
dc.description.filFil: Marino, Andrea Ivana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentinaes_AR
dc.description.filFil: Borrelli, Laura Beatriz. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentinaes_AR
dc.description.filFil: Bay Gavuzzo, Alhue. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentinaes_AR
dc.description.filFil: 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; Argentinaes_AR
dc.subtypecientifico


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