Competition can be keen within and between closely related species but can be reduced when sympatric individuals differ in resource use. To determine how sympatric, closely related species coexist, we examined movement and activity of foraging individuals, developing detailed profiles for males of three species (Acanthodactylus boskianus, A. dumerilii and A. scutellatus) and for female A. boskianus in arid sub-desert steppes of southern Tunisia. All three species were active concurrently with different peak activity times. Males varied markedly in their movement, as did A. boskianus sexes. Interspecifically, male A. boskianus moved most frequently, for the most time, covering the greatest distance and searching the largest area, while male A. dumerilii moved the least often, travelled the shortest distances and intensively searched small areas. Acanthodactylus scutellatus males generally were intermediate between the other species but dug more frequently and had movement rates comparable to A. boskianus. Intraspecifically, A. boskianus females moved less frequently, for a smaller percentage of time, covering shorter distances and searching smaller areas than male A. boskianus. Habitat use varied among species and by sex within A. boskianus. Differences in movement and activity likely reflect differences in resource use that promote coexistence between and within species.

中文翻译：

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三种同域蜥蜴（棘指属）的运动和空间利用：种间和种内比较

密切相关的物种内部和之间的竞争可能会很激烈，但当同域个体在资源利用方面存在差异时，竞争就会减少。为了确定同域、密切相关的物种如何共存，我们研究了觅食个体的运动和活动，为干旱亚沙漠中的三个物种（ Acanthodactylus boskianus、A. dumerilii和A. scutellatus）的雄性和雌性A. boskianus建立了详细的资料。突尼斯南部的草原。所有三个物种都同时活跃，并具有不同的高峰活动时间。雄性的运动方式存在显着差异，博斯基亚努斯的性别也是如此。种间来看，雄性博斯基亚种迁徙最频繁、时间最长、移动距离最远、搜索范围最大，而雄性杜美里亚种移动最频繁、移动距离最短、搜索区域最密集。雄性Acanthodactylus scutellatus 的体质一般介于其他物种之间，但挖掘频率更高，移动速度与A. boskianus相当。在种内，与雄性博斯基亚努斯相比，雌性博斯基亚努斯的移动频率较低，时间比例较小，移动距离较短，搜索区域较小。博斯基亚努斯的栖息地利用因物种和性别而异。运动和活动的差异可能反映了促进物种间和物种内共存的资源利用的差异。