The visual perceptual range of a lizard, <Emphasis Type="Italic">Tiliqua rugosa</Emphasis> |
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Authors: | Zonnetje M Auburn C Michael Bull Gregory D Kerr |
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Institution: | (1) School of Biological Sciences, Flinders University, GPO Box 2100, Adelaide, SA, 5001, Australia |
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Abstract: | The fragmentation of landscapes produces habitat gaps where the distance between visual landmarks may exceed the perceptual
range of a species and impose navigational constraints. We estimated the visual perceptual range of the Australian sleepy
lizard, Tiliqua rugosa, by releasing individuals in the centre of a cleared arena in high temperature conditions, with a 0.5-m-high bush placed
either 10, 20 or 30 m from the release site. Lizards were more likely to locate those bushes and shelter under them when they
were closer, and no lizards found a bush at 30 m. In addition, lizards were less likely to move from the release point when
bushes were at 30 m than when they were at the two closer distances. These data suggest that for sleepy lizards the perceptual
range for a 0.5-m-high bush is about 20 m. In the uncleared chenopod shrub-land where these lizards live, suitable shelter
bushes are an average of 10.5 m from any point in their home range, well within their perceptual range. |
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Keywords: | Lizard Navigation Home range Visual perception Perceptual range Tiliqua rugosa |
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