Nom du corpus

Corpus Systématique Animale

Titre du document

Contrasts in energy intake and expenditure in sit-and-wait and widely foraging lizards

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Reptiles_v2b_00443
Auteur(s)
  • R. A. Anderson 1
  • W. H. Karasov 1
Affiliation(s)
  • 1) Department of Biology, University of California, 90024, Los Angeles, CA, USA
Résumé

Daily energy metabolism and water flux were measured with doubly labeled water in the free-living insectivorous lizards Cnemidophorus tigris (mean body mass 15.7 g) and Callisaurus draconoides (8.6 g) in June 1979 in the Colorado Desert of California. C. tigris was an active forager; it spent 91% of its 5-h daily activity period in movement. C. draconoides was a sit-and-wait predator; it spent less than 2% of its 10-h activity period in movement. C. tigris had significantly higher rates of field energy metabolism and water influx (210 Jg-1 day-1, 36.8 ul H2O g-1 day-1, N=19) than C. draconoides (136, 17.1, N=18). There were no significant differences between the sexes within either species. The extra costs of free existence were calculated from differences between field metabolic rates and maintenance costs estimated from laboratory respirometry. Rates of energy metabolism during the field activity period were about 1.5x resting levels at 40° C (?field active body temperature) for C. draconoides and 3.3 x resting levels at 40° C (?field active body temperature) for the more active C. tigris. Feeding rates calculated from water influx data were 13.3 mg g-1 day-1 for C. tigris and 5.8 mg g-1 day-1 for C. draconoides. Though C. tigris had a high rate of energy expenditure, its foraging efficiency $\frac{{{\text{metabolizable energy intake}}}}{{{\text{energy expended}}}}$ was higher than C. draconoides'.

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
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - ecology
Identifiant ISTEX
053A82BC2DCA9C96870ECD323E9CD297DEF0BBA0
Revue

Oecologia

Année de publication
1981
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.652
Sous-corpus
  • Reptiles
Type de publication
Journal
ark:/67375/1BB-1XV8T8PV-7
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