Activity patterns and movements of free-ranging bluetongue lizards (Tiliqua scincoides intermedia and Tiliqua multifasciata) in the Australian wet-dry tropics

Samantha J. Price-Rees, Gregory P. Brown, Richard Shine*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We used GPS-based radiotelemetry to quantify diel activity patterns and movements by two species of large scincid lizards in the Australian wet-dry tropics. From an average of 63 days tracking of 54 Northern Bluetongues (Tiliqua scincoides intermedia) and 42 days tracking of 8 Centralian Bluetongues (Tiliqua multifasciata), we obtained 53,801 and 8,139 data points, respectively, on lizard locations over a 13-month period. Lizard species, sex, and study site had relatively little effect on distances moved, at both daily and hourly levels. However, Northern Bluetongues moved further per day than did Centralian Bluetongues at a site where they were sympatric. Most movements were <20 m, with longer movements (dispersal between core areas within the wider home range) occurring primarily during midmorning and late afternoon. The only major effect of ambient temperatures on lizard activity patterns likely was that midday movements were precluded by the risk of overheating; at all other times of the day and night, temperatures remained within a range that enabled effective locomotion and foraging. Thus, thermal constraints of the timing and extent of movements are less important in this system than in the cool-temperate squamate species that have been the focus of most previous research on this topic.

Original languageEnglish
Pages (from-to)298-305
Number of pages8
JournalJournal of Herpetology
Volume48
Issue number3
DOIs
Publication statusPublished - 1 Sep 2014
Externally publishedYes

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