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In the Kinabatangan floodplain, Sabah, Malaysian Borneo, oil palm and settlements have reduced and fragmented lowland tropical forests, home to around 200 endangered Bornean elephants ( Elephas maximus borneensis ). In this region, elephants range within forests, oil palm and community areas. The degree to which elephants are using these areas remains unclear. We used GPS telemetry data from 2010 to 2020 for 14 collared elephants to map their entire known ranges and highly used areas (hot spots) across four land use categories and estimate time spent within these. The use of land use types across elephants varied significantly. Typically, females had strong fidelity to forests, yet many of these forests are threatened with conversion. For the three males, and several females, they heavily used oil palm estates, and this may be due to decreased landscape permeability or foraging opportunities. At the pooled level, the entire range and hot spot extents, constituted 37% and 34% for protected areas, respectively, 8% and 11% for unprotected forests, 53% and 51% for oil palm estates, and 2% for community areas. Protecting all forested habitats and effectively managing areas outside of protected areas is necessary for the long-term survival of this population.

Despite its commercial success, intensive oil palm monoculture is facing both social and environmental constraints. Adapting the traditional plantation model towards more resilient and climate-smart farming systems will require deep changes. Agroforestry offers great potential for biodiversity and carbon storage benefits while maintaining high palm oil yields. The TRAILS multidisciplinary research project has installed a 39-ha prototype experiment in Sabah, Malaysia. The project includes different planting designs (interplanted rows, mixed tree plantation and forest islands) aimed at providing information about: i) the ability of oil palm to grow in competition with forest trees, ii) the best combination of tree species and their compatibility with the oil palm constraints for co-cultivation, and iii) the growth and developmental characteristics of a selected number of native forest species of interest. More specifically, we plan to describe changes in biodiversity and ecosystem services together with oil palm performance.

Great ape populations are undergoing a dramatic decline, which is predicted to result in their extinction in the wild from entire regions in the near future. Recent findings have particularly focused on African apes, and have implicated multiple factors contributing to this decline, such as deforestation, hunting, and disease. Less well-publicised, but equally dramatic, has been the decline in orang-utans, whose distribution is limited to parts of Sumatra and Borneo. Using the largest-ever genetic sample from wild orang-utan populations, we show strong evidence for a recent demographic collapse in North Eastern Borneo and demonstrate that this signature is independent of the mutation and demographic models used. This is the first demonstration that genetic data can detect and quantify the effect of recent, human-induced deforestation and habitat fragmentation on an endangered species. Because current demographic collapses are usually confounded by ancient events, this suggests a much more dramatic decline than demographic data alone and emphasises the need for major conservation efforts.

Great apes are threatened with extinction, but precise information about the distribution and size of most populations is currently lacking. We conducted orangutan nest counts in the Malaysian state of Sabah (North Borneo), using a combination of ground and helicopter surveys, and provided a way to estimate the current distribution and size of the populations living throughout the entire state. We show that the number of nests detected during aerial surveys is directly related to the estimated true animal density and that a helicopter is an efficient tool to provide robust estimates of orangutan numbers. Our results reveal that with a total estimated population size of about 11,000 individuals, Sabah is one of the main strongholds for orangutans in North Borneo. More than 60% of orangutans living in the state occur outside protected areas, in production forests that have been through several rounds of logging extraction and are still exploited for timber. The role of exploited forests clearly merits further investigation for orangutan conservation in Sabah.

Geographic variation in some aspects of chimpanzee behavior has been interpreted as evidence for culture. Here we document similar geographic variation in orangutan behaviors. Moreover, as expected under a cultural interpretation, we find a correlation between geographic distance and cultural difference, a correlation between the abundance of opportunities for social learning and the size of the local cultural repertoire, and no effect of habitat on the content of culture. Hence, great-ape cultures exist, and may have done so for at least 14 million years.

High concentrations of orangutans remain in the multiple-use forests of the Lower Kinabatangan, Sabah, Malaysia. Compared to primary forest, the habitat is highly fragmented, characterized by a low tree density (332 stems/ha), small tree size (83.6% of trees are <20 m high), low basal area (18 m^sup 2^/ha), abundance of canopy gaps and high level of soil disturbance. The forest structure and composition influence orangutan nesting patterns, and thus directly influence the results of nest surveys used to determine orangutan population size. In logged forests, tall and large trees are the preferred nesting sites of orangutans. The scarcity of suitable nesting sites in the logged-over forests of Kinabatangan, could partly explain the lower daily rate of nest construction (r = 1.00) versus those of other orangutan populations. The nest decay rate t recorded at the study site (average ± SD = 202 ± 151 days) strongly depends on the species of tree in which a nest is built. Our results illustrate that the nest-related parameters used for orangutan censuses fluctuate among habitat types and emphasize the need to determine specific values of r for specific orangutan populations and of t for different tree species in order to achieve accurate analysis of census data.[PUBLICATION ABSTRACT]

Poxvirus was isolated from cutaneous nodules on two young Houbara bustards (Chlamydotis undulata) bred in captivity in Saudi Arabia. Birds were emaciated and presented nodules on tibiotarso-tarsometatarsal joints, toes, and the carpal joint. Diagnosis was confirmed by histopathology, virus isolation on inoculated chorioallantoic membranes of embryonated chicken's eggs, and electron microscopy. Progressive leg lesions were extensive and interfered with walking, significantly debilitating the birds. Successful excisions of these lesions were performed.

Returning confiscated animals to their native habitats is desirable when it makes a positive contribution to the conservation of the species. Release of captive individuals is complex and controversial, however, particularly when risks are potentially high, as in the case of orphaned apes. We describe the decision-making process that led to the successive release of 20 wild-born orphan chimpanzees (Pan troglodytes troglodytes) into the Conkouati Reserve in the Republic of Congo. Recommendations of the Reintroduction Specialist Group of the World Conservation Union's Species Survival Commission were followed closely. The conservation status, ecology, and behavior of wild chimpanzees; the biological, social, economic and political context of the release site; and the health and genetic status of the candidates for release were all taken into account in the planning and execution of the project. Rigorous post-release monitoring of behavior and health allowed documentation of the outcome. The project was of benefit to the chimpanzees that were released but also brought broad benefits to the site through effective protection from poaching and deforestation, and direct and indirect benefits to local people. The genetic and behavioral diversity of chimpanzees require a variety of conservation strategies to reduce threats and maintain as many viable wild populations as possible.

The use of non-invasive genetics to study great apes has become increasingly common [Gerloff et al., 1999; Vigilant et al., 2001; Utami et al., 2002; Clifford et al., 2003]. Apes are known to build a new nest every night and hair shed during the night can be easily found in these platforms but, where nests are built high in trees, shed-hair collection can be both difficult and dangerous. Moreover, DNA extracted from shed hairs can be degraded and in low quantities [Gagneux et al., 1997]. Low amounts of DNA can generate unreliable data such as allelic dropout and false alleles during the amplification of genetic markers such as microsatellites [Gagneux et al., 1997; Taberlet et al., 1999]. Despite the fact that new techniques [Morin et al., 2001] and simulation software [Valiere et al., 2002] have been published and can be used for accurate microsatellite genotyping from non-invasive samples, the quality of the samples must not be neglected. DNA is present only in the roots of shed hairs, and previous studies have shown that an increase in the number of roots in a hair sample increases microsatellite genotyping reliability [e.g. Gagneux et al., 1997]. In this paper, we present evidence that hairs shed by orang-utans should ideally be collected from fresh nests between 1 and 5 nights old. We also suggest that 1-night-old nests are preferable, due to the opportunity to find fresh faeces below them.