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1978
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Sauria Lacertilia Lacertilians Lacertilian reptiles Horned lizards Phrynosoma Horny toads United Mexican States Lacertilia Sauria Podarcis Méjico Estados Unidos Mexicanos Nueva España Crapauds cornus Phrynosoma Lézards-crapauds Lézards cornus Cnemidophorus Lézards coureurs Lacertiliens Sauriens Lacertilia Sauria Modes opératoires Techniques Mode opératoire technique technique de fabrication techniques Etats-Unis du Mexique Nouvelle-Espagne Nouvelle Espagne Vice-Royauté de la Nouvelle-Espagne (1535-1821) Nouvelle-Espagne (1535-1821)Citer ce document
R. Barbault et al., « Le partage des ressources alimentaires entre les espèces de lézards du désert de Mapimi, Mexique », Revue d'Écologie (La Terre et La Vie) (documents), ID : 10.3406/revec.1978.4998
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Résumé
The diet of several sympatric species of lizards has been studied in the Mapimi desert, Durango, Mexico, in order to elucidate the ways in which resource partitioning is achieved. Despite the optional specialization of the three Cnemidophorus species (termite eaters) and of Phrynosoma modestum (an ant eater), all these lizards are mostly opportunistic feeders ; their diets are highly diversified and largely overlapping. The larger lizards, which feed upon both large and small prey species, should exert a strong competitive pressure upon smaller lizards which are limited to smaller prey. However, small lizards avoid such a competition either by having a specialized diet (e.g. Phrynosoma modestum) or by living in certain microhabitats (e.g. Cnemidophorus inornatus which is confined to Hilaria mutica communities) . In such an ecosystem, resource partitioning among sympatric lizard species is therefore mostly achieved through microhabitat preferences, and also through different feeding strategies (e.g. the «sit-and-wait» technique versus the «widely foraging» technique).