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According to ecological theory, the concept of niche differentiation is essential to our understanding of how sympatric species can limit competition over resources. We here examine ecological niche differentiation in 2 sympatric Asian langurs, Presbytis potenziani and Simias concolor, both endemic to the Mentawai Islands off the west coast of Sumatra. We(More)
We present data on group structure and physical characteristics from free-ranging Simias concolor. Mean group size (n = 3) was 8.7 +/- 1.1 individuals with an average adult male:female sex ratio of 1:3. All individuals were sexed and allocated into three categories (infants, juveniles plus subadults and adults) on the basis of their physical development.(More)
OBJECTIVE Studies in Southeast Asia showed that HLA-B*2704 is positively associated with spondyloarthropathy (SpA), while B*2706 does not occur in such patients. In view of the absence of an association between B*2706 and SpA it was suggested that B*2706 protects against the disease, while it is supposed that B*2704 presents pathogenetic peptides. We(More)
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