Effects of habitat and land use on breeding season density of male Asian Houbara Chlamydotis macqueenii

Landscape-scale habitat and land-use influences on Asian Houbara Chlamydotis macqueenii (IUCN Vulnerable) remain unstudied, while estimating numbers of this cryptic, low-density, over-hunted species is challenging. In spring 2013, male houbara were recorded at 231 point counts, conducted twice, across a gradient of sheep density and shrub assemblages within 14,300 km² of the Kyzylkum Desert, Uzbekistan. Four sets of models related male abundance to: (1) vegetation structure (shrub height and substrate); (2) shrub assemblage; (3) shrub species composition (multidimensional scaling); (4) remote-sensed derived land-cover (GLOBCOVER, 4 variables). Each set also incorporated measures of landscape rugosity and sheep density. For each set, multi-model inference was applied to generalised linear mixed models of visit-specific counts that included important detectability covariates and point ID as a random effect. Vegetation structure received strongest support, followed by shrub species composition and shrub assemblage, with weakest support for the GLOBCOVER model set. Male houbara numbers were greater with lower mean shrub height, more gravel and flatter surfaces, but were unaffected by sheep density. Male density (mean 0.14 km-2, 95% CI, 0.12‒0.15) estimated by distance analysis differed substantially among shrub assemblages, being highest in vegetation dominated by Salsola rigida (0.22 [CI, 0.20‒0.25]), high in areas of S. arbuscula and Astragalus (0.14 [CI, 0.13‒0.16] and 0.15 [CI, 0.14‒0.17] respectively), lower (0.09 [CI, 0.08‒0.10]) in Artemisia and lowest (0.04 [CI, 0.04‒0.05]) in Calligonum. The study area was estimated to hold 1,824 males (CI: 1,645‒2,030). The spatial distribution of relative male houbara abundance, predicted from vegetation structure models, had the strongest correspondence with observed numbers in both model-calibration and the subsequent year’s data. We found no effect of pastoralism on male distribution but potential effects on nesting females are unknown. Density differences among shrub communities suggest extrapolation to estimate country- or range-wide population size must take account of vegetation composition

African elephant poaching rates correlate with local poverty, national corruption and global ivory price

Poaching is contributing to rapid declines in elephant populations across Africa. Following high-profile changes in the political environment, the overall number of illegally killed elephants in Africa seems to be falling, but to evaluate potential conservation interventions we must understand the processes driving poaching rates at local and global scales. Here we show that annual poaching rates in 53 sites strongly correlate with proxies of ivory demand in the main Chinese markets, whereas between-country and between-site variation is strongly associated with indicators of corruption and poverty. Our analysis reveals a recent decline in annual poaching mortality rate from an estimated peak of over 10% in 2011 to <4% in 2017. Based on these findings, we suggest that continued investment in law enforcement could further reduce poaching, but is unlikely to succeed without action that simultaneously reduces ivory demand and tackles corruption and poverty

Sex-specific habitat use by a lekking bustard: Conservation implications for the critically endangered Bengal Florican (Houbaropsis bengalensis) in an intensifying agroecosystem

Understanding sexual differences in habitat use is important for effective conservation management, particularly with regard to polygynous species, the sexes of which may differ in their responses to land-use change. We examined sex-specific habitat use in the critically endangered Bengal Florican (Houbaropsis bengalensis), a polygynous bustard whose most important population occurs in traditionally farmed grasslands in the Tonle Sap floodplain, Cambodia. This habitat is undergoing rapid conversion to intensive dry-season rice production. Using radiotelemetry, we compared male and female breeding-season habitat selection and home-range sizes and configurations. The sexes differed in their spatial use of the lek and their ability to utilize anthropogenic habitat features. Both sexes avoided intensive dry-season rice fields. Males selected habitats related to low-intensity human activity, chiefly burned grassland, whereas females selected unburned grassland but also used unburned, uncultivated grassland in dry-season rice head-ponds. These differences reflect the species' breeding system, with males using open areas for display and females selecting cover. Our findings demonstrate the importance of the landscape heterogeneity associated with traditional human activity in maintaining the habitat mosaics necessary for the contrasting breeding-season requirements of male and female Bengal Floricans. Two-thirds of tagged females may have left the lek to nest elsewhere, which suggests that protecting habitat in which males display will not be a sufficient conservation response for such lekking species. Both sexes are detrimentally affected by agricultural intensification within the Tonle Sap, and encouragement of industrial rice production to spare more "natural" habitats elsewhere is likely to be counterproductive for this globally threatened flagship species