n African Zoology - Foraging strategies of coexisting lacertid lizards in the arid Tankwa Karoo Basin of South Africa

Volume 47, Issue 1
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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Four lacertid lizards, and , occur sympatrically on the arid plains of the Tankwa Karoo Basin in South Africa. The aim of this study was to evaluate the significance of foraging strategy in resource partitioning among the four species, allowing them to co-occur in a structurally simple system with a limited number of potential niches. Previous workers already identified and as sit-and-wait foragers and as an active forager. We recorded data on three foraging variables: movements per minute, proportion of time spent moving, and proportion of attacks on prey whilst moving, for juveniles and adults of . By comparing the foraging data obtained for to those for other lacertid species, we were able to demonstrate that adult are ambush foragers. We also noted a significant ontogenetic shift in foraging behaviour in , and, due to a significantly higher frequency of short brief movements, we classified juveniles as mixed foragers. The sharing of an ambush foraging strategy by at least three of the four lacertid species co-occurring on the Tankwa plains, suggests considerable overlap along the trophic dimension of ecological space. This overlap presumably promotes occupation of separate microhabitats by the three ambush foragers in the Tankwa Karoo Basin.

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