Ontogenetic variation in the autecology of the greater earless lizard Cophosaurus texanus

RD Durtsche, PJ Gier, MM Fuller, WI Lutterschmidt… - …, 1997 - Wiley Online Library
RD Durtsche, PJ Gier, MM Fuller, WI Lutterschmidt, R Bradley, CK Meier, SC Hardy
Ecography, 1997Wiley Online Library
We investigated the potential for ontogenetic resource partitioning within a population of the
Texas earless lizard Cophosaurus texanus Results from focal samples, line transects,
haphazard observations, and stomach flushes compiled in summer (July 1993) and autumn
(September 1995) revealed differences in microhabitat use and diet between adults and
juveniles Juveniles use rock perches more frequently than adult males, and consume
smaller prey than adults No ontogenetic differences in thermal ecology were observed Diet …
We investigated the potential for ontogenetic resource partitioning within a population of the Texas earless lizard Cophosaurus texanus Results from focal samples, line transects, haphazard observations, and stomach flushes compiled in summer (July 1993) and autumn (September 1995) revealed differences in microhabitat use and diet between adults and juveniles Juveniles use rock perches more frequently than adult males, and consume smaller prey than adults No ontogenetic differences in thermal ecology were observed Diet differences between juveniles and adults may be attributed to the inability of juveniles to handle large prey items Differences between juveniles and adults in prey size and microhabitat use suggest ontogenetic variation in foraging, predator avoidance, and territory defense
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