Nom du corpus

Corpus Systématique Animale

Titre du document

Island/mainland body size differences in Australian varanid lizards

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Lizards
  • Islands
  • Gigantism
  • Varanus
Nom du fichier dans la ressource
Reptiles_v2b_00670
Auteur(s)
  • Ted J. Case 1
  • Terry D. Schwaner 2
Affiliation(s)
  • 1) Department of Biology, C-016, University of California at San Diego, 92093, La Jolla, CA, USA
  • 2) Alabama School of Mathematics and Science, PO Box 161628, 36616, Mobile, AL, USA
Résumé

Island varanids seem to be an exception to the rule that territorial vertebrate taxa often become gigantic relative to mainland relatives when on islands, whereas non-territorial species become dwarfed (Case 1978). However, no systematic island/mainland studies have examined the empirical size trends in this group of carnivorous lizards. We perform such an analysis for the Australian region and critically evaluate various selective agents that might be responsible for size changes in several island populations. Insular gigantism occurs at least four times among the island populations examined. The magnitude of size change is positively correlated to prey abundance on the islands (as indirectly measured through a condition index of the lizards, essentially a measure of how fat they arc) and the size of prey: islands with large prey have large varanids and vice versa. Since the island population with the largest size change, the Reevesby Varanus rosenbergi, was introduced less than 100 years ago, these size changes can be quite rapid. This might indicate that selective coefficients are strong; however, we can not exclude the possibility that these size differences have no genetic component and simply reflect environmental differences in growth rate and shifts in age structure between island and mainland locations.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - ecology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - vertebres: systeme respiratoire
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - ecology
Identifiant ISTEX
A733DD85C49BC7A3B46681947603DBE4E7441F9E
Revue

Oecologia

Année de publication
1993
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.424
Sous-corpus
  • Reptiles
Type de publication
Journal
ark:/67375/1BB-9JQVDJ6L-P
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