INVESTIGADORES
OJEDA Ricardo Alberto
artículos
Título:
Niche partitioning and coexistence between two mammalian herbivores in the
Autor/es:
CHILLO, V., RODRIGUEZ, MD, OJEDA, RA
Revista:
ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY
Editorial:
GAUTHIER-VILLARS/EDITIONS ELSEVIER
Referencias:
Año: 2010 vol. 36 p. 611 - 616
ISSN:
1146-609X
Resumen:
Competitive interactions are known to be stronger between morphologically similar and phylogenetically
closely related sympatric species. Patagonian mara (Dolichotis patagonum) and Chacoan cavy
(Pediolagus salinicola) are two medium-sized herbivorous mammals which have disjunctive distributions
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
(Pediolagus salinicola) are two medium-sized herbivorous mammals which have disjunctive distributions
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
(Pediolagus salinicola) are two medium-sized herbivorous mammals which have disjunctive distributions
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
Dolichotis patagonum) and Chacoan cavy
(Pediolagus salinicola) are two medium-sized herbivorous mammals which have disjunctive distributions
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands
Pediolagus salinicola) are two medium-sized herbivorous mammals which have disjunctive distributions
within a sympatric region characterized by dry woodlands and shrublands (Dry Chaco, Argentina). The
niche partition hypothesis predicts that ecologically similar species living together should show differentiation
in at least one of the main niche dimensions to avoid competition. Thus, we predict that
Patagonian mara and Chacoan cavies will differentiate in the use of trophic and/or spatial niche. To prove
this hypothesis, we sampled 26 study sites in the dry and wet season and collected fresh faeces of both
species. We estimated the diet composition using microhistological analysis of faeces. For habitat
analysis we measured 16 vegetation variables, as well as habitat complexity and heterogeneity structure.
Our results showed that during the dry season, both species segregate their diet but not their habitat
niche, whereas during the wet season they segregate their habitat, and diet segregation is diffused. Diet
overlap was similar between seasons, indicating a change in the foraging strategy of the cavy, which
selected forbs, grasses, succulents and trees in the dry season and only grasses in the wet season. Our
results support the niche partition hypothesis as a mechanism of coexistence among ecologically similar
species in the South American temperate arid lands