科研之友
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摘要
Studies of diet suggest that skinks are opportunistic predators. However, there is little information on actual diet preferences because most studies do not evaluate the availability of prey in the environment. We analysed the diet selection of a population of the little-known skink Chalcides parallelus from the Chafarinas Islands in North Africa. This species is considered highly threatened, and diet selection is an important basic point on which to support the design of conservation plans. We specifically examined diet estimated from faecal material collected from live skinks, and compared diet with availability of invertebrates in the microhabitats used by skinks (under rocks and in the leaf litter). Results indicated that the diet of C. parallelus skinks consisted of the same types of invertebrates that are more commonly found in the habitat such as beetles (54.8% of prey), cockroaches, spiders and snails. This diet could be considered generalist, and probably opportunistic. However, the comparison of proportions of prey types in the diet and those available in the habitat revealed that C. parallelus did not eat prey at random, but selected some particular prey types (beetles, cockroaches, and pseudoscorpiones) while others (ants and isopods) were consumed less than expected by their abundance. Invertebrates available and consumed did not differ in size, but skinks consumed beetles that were smaller than the average size of those available. We discuss how diet preferences could be due to selection of the more profitable or easily captured prey.
- 出版日期2013-10-1
