Stable isotopes document mainland-island divergence in resource use without concomitant physiological changes in the lizard <i>Liolaemus pictus</i>

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dc.contributor.authorVidal, Marcela A.
dc.contributor.authorSabat, Pablo
dc.date.accessioned2025-01-21T00:06:06Z
dc.date.available2025-01-21T00:06:06Z
dc.date.issued2010
dc.description.abstractShifts in feeding ecology are believed to promote island-mainland divergence. The lizard Liolaemus pictus has several different subspecies on Chilean islands and mainland. These subspecies inhabit contrastingly different habitats both in different islands and mainland, which suggests the potential for habitat related dietary variation. We investigated the dietary habits of L. pictus by both stomach content analyses and by nitrogen stable isotope analyses (delta N-15), which we used as a proxy variable for trophic level. We also compared the morphology of the digestive tract and the activity of intestinal digestive enzymes of mainland and island lizards. We hypothesized differences in diet and trophic level among populations and that these differences would predict the expression of the morphological and biochemical features of the digestive tract. More specifically, we predicted shorter intestines and higher levels of peptidases in more insectivorous than in more frugivorous/herbivorous lizards. The diet of L. pictus was characterized by the consumption of a wide diversity of food types, including fruit and insects, in all populations. Stable isotopes revealed higher trophic level, and hence probably higher protein intake, in mainland than in island populations, but contrary to our prediction, they had shorter intestines and higher relative activity of intestinal peptidases than mainland lizards. Furthermore, the proportion of fruit items in the stomach content was higher in the population that exhibited the lowest tropic level. These results suggest that morphological and physiological differences among populations of L. pictus are not correlated with feeding ecology, suggesting that the lizard's first responses to the selective pressure represented by a diet shift are behavioral. (C) 2010 Elsevier Inc. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.cbpb.2010.02.005
dc.identifier.eissn1879-1107
dc.identifier.issn1096-4959
dc.identifier.urihttps://doi.org/10.1016/j.cbpb.2010.02.005
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95575
dc.identifier.wosidWOS:000276734500010
dc.issue.numero1
dc.language.isoen
dc.pagina.final67
dc.pagina.inicio61
dc.revistaComparative biochemistry and physiology b-biochemistry & molecular biology
dc.rightsacceso restringido
dc.subjectAminopeptidase-N
dc.subjectAntillanca
dc.subjectButachauques
dc.subjectChiloe
dc.subjectDisacharidases
dc.subjectHornopiren
dc.subjectLizards
dc.subjectStable isotopes
dc.subjectTalcan
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleStable isotopes document mainland-island divergence in resource use without concomitant physiological changes in the lizard <i>Liolaemus pictus</i>
dc.typeartículo
dc.volumen156
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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