No abstract

Studies on genetic relationships and phylogenetic origins, and mutations in nucleotide of Leiolepis in central Vietnam are limited. In this study, thirty-five representative samples of four species (Leiolepis reevesii, L. guttata, L. guentherpetersi, and L. rubritaeniata) from multiple provinces in central Vietnam were collected for identification based on 16S rRNA sequences. The results from phylogenetic analyses showed that L. rubritaeniata is highly genetically conserved and was unique for the Central Highland areas. Patterns, colors, and genetic characteristics of the population of L. reevesii in Thanh Hoa Province exhibited differences between the populations in Thua Thien Hue Province. The population of L. guentherpetersi had the closest sister relationship to the population of L. guttata found in the same province, supporting a hypothesis that the origin of the triploid L. guentherpetersi from L. guttata. Leiolepis reevesii populations found in Thanh Hoa and Thua Thien Hue provinces were not in the same clade for both morphology and genetics. Lastly, the overall similarity between L. rubritaeniata and L. reevesii populations further suggesting that both species were originally from the same clade with a diversification occuring to adapt to the ecological conditions.

Lizard species are rarely detected with perfect accuracy, regardless of the method employed. Nondetection of a species at a site does not necessarily mean the species was absent unless the detection probability was 100%. We assessed the influence of site covariates (less disturbed habitat and disturbed habitat) and sample covariates (temperature, humidity, rainfall) on the occupancy of Eutropis longicaudata in the Aluoi area, central Vietnam. Based on detection/nondetection data over nine visits at 40 less disturbed sites and 39 sites with disturbed habitats, the distribution of E. longicaudata was estimated using site occupancy models. From the best model, we estimated a site occupancy probability of 0.595, a 12.05% increase over the naive occupancy of 0.531 at which E. longicaudata skinks were actually observed. The site covariate of the less disturbed habitat was an important determinant of site occupancy, which was not associated with the variable of disturbance habitats. In the combined AIC model weight, p(precipitation), p(temperature), and p(humidity) have 92%, 36%, and 21% of the total, respectively; providing evidence that environmental conditions (especially precipitation) were important sample covariates in modelling detection probabilities of E. longicaudata. In terms of occupancy probability, the combined weight for the ψ(less disturbed habitat) model and the ψ(disturbed habitat) model were 60% and 32%, respectively. Our results substantiate the importance of incorporating detection and occupancy probabilities into studies of habitat relationships and suggest that the less disturbed habitat associated with weather conditions influence the occupancy of E. longicaudata in central Vietnam.

In this study, we examined the diet of 149 males and 147 females of Eutropis macularius from Thua Thien Hue Province, central Vietnam using a nonlethal stomach-flushing technique. The prey items of E. macularius composed of Araneae, Insecta (Blattodea, Coleoptera, Hymenoptera, Isoptera, Odonata, and Orthoptera), Mollusca (Philomycidae), and plant materials. The most important prey items were insect larvae, hymenopterans (including ants), grasshoppers, and termites, for both sexes in three populations. Plant materials were also found in the stomach of E. macularius with an index of relative importance of 7.19%, suggesting that E. macularius is an omnivorous species. However, the dominant prey categories of E. macularius were insects, including insect larvae, hymenopterans, grasshoppers, and termites, with many small, sedentary, clumped prey items. Simpson’s heterogeneity index of skinks from three populations from Bach Ma National Park as well as from Aluoi and Huong Tra districts were 10.07, 7.85, 3.94, respectively. Eutropis macularius showed significant positive correlations between mouth width (MW) and prey width (P = 0.001) and between MW and prey volume (P 0.0001). There are significant positive correlations between snout-vent length (SVL) and prey sizes consumed: between SVL and prey length, P 0.0001; SVL and prey width, P 0.0001; and between SVL and prey volume, P 0.0001. These results indicated that SVL and MW are the limiting factors on the size of prey consumed in this skink.