Sleeping exposes lizards to predation. Therefore, sleeping strategies must be directed towards avoiding predation and might vary among syntopic species. We studied sleeping site characteristics of two syntopic, congeneric lizards -the Bay Island forest lizard, Coryphophylax subcristatus and the short-tailed Bay Island lizard, C. brevicaudus and evaluated inter-specific differences. We measured structural, microclimatic and potential predator avoidance at the sleeping perches of 386 C. subcristatus and 185 C. brevicaudus.Contrary to our expectation, we found similar perch use in both species. The lizards appeared to use narrow girth perch plants and accessed perches by moving both vertically and horizontally. Most lizards slept on leaves, with their heads directed towards the potential path of a predator approaching from the plant base. There was no inter-specific competition in the choices of sleeping perches. These choices indicate an anti-predator strategy involving both tactile and visual cues. This study provides insight into a rarely studied behaviour in reptiles and its adaptive significance. 46 with their heads directed towards the potential path of a predator approaching from the plant 47 base. There was no inter-specific competition in the choices of sleeping perches. These choices 48 indicate an anti-predator strategy involving both tactile and visual cues. This study provides 49 insight into a rarely studied behaviour in reptiles and its adaptive significance.

Abstract:Behavioral observations on Indian peafowl Pavo cristatus in the Shivalik landscape of North India were carried out during their mating period, between 31 March and 21 May 2006. Behaviors of peafowl were recorded using scan samples. Overall, females, sub-adult males and adult males spent different proportions of time in different activities, and the proportion of time spent on different activities varied during the mating season. Visitation by females influenced the frequency of displays by adult male Indian peafowl during this period. The study reveals that peafowl behavior in its native habitat broadly conforms to that documented from captive and introduced populations. However, there were some differences between the wild and captive populations in vocalizations, maintenance behavior and spatial distribution of adult males. Since the time spent engaging in these behaviors may affect the cost of display, these results emphasize the need to assess the signaling cost in situ where the behavior evolved.

BackgroundOne of the basic premises of drawing samples from populations is that the samples are representative of the populations. However, error in sampling is poorly recognized, and it goes unnoticed especially in community ecology. By combining traditional open quadrats used for sampling forest floor herpetofauna with intensive bounded quadrats, we explore the effect of sampling error on estimates of species richness, diversity, and density in the Andaman Islands.ResultsFisher’s α measure of species diversity and second order jackknife estimate of species richness were not sensitive to number of individuals sampled. Sampling error resulted in underestimation of density in both frogs and lizards. It influenced relative abundance of individual species resulting in underestimation of abundance of small or camouflaged species; and also resulted in low precision in lizard species richness estimates.ConclusionsSampling error resulted in underestimation of abundance of small, fossorial or camouflaged species. Imperfect detection from less intensive sampling method results incorrect estimates of abundance of herpetofauna. Fisher’s α for species diversity and second order jackknife for species richness were robust measures. These have strong implications on inferences made from previous studies as well as sampling strategies for future studies. It is essential that these shortfalls are accounted for while communities are sampled or when datasets are compared.Electronic supplementary materialThe online version of this article (doi:10.1186/s12898-015-0049-5) contains supplementary material, which is available to authorized users.

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