Genetic Structure, Nestmate Recognition and Behaviour of Two Cryptic Species of the Invasive Big-Headed Ant Pheidole megacephala

info:eu-repo/semantics/publishe

An estimate of the number of tropical tree species

The high species richness of tropical forests has long been recognized, yet there remains substantial uncertainty regarding the actual number of tropical tree species. Using a pantropical tree inventory database from closed canopy forests, consisting of 657,630 trees belonging to 11,371 species, we use a fitted value of Fisher’s alpha and an approximate pantropical stem total to estimate the minimum number of tropical forest tree species to fall between ∼40,000 and ∼53,000, i.e. at the high end of previous estimates. Contrary to common assumption, the Indo-Pacific region was found to be as species-rich as the Neotropics, with both regions having a minimum of ∼19,000–25,000 tree species. Continental Africa is relatively depauperate with a minimum of ∼4,500–6,000 tree species. Very few species are shared among the African, American, and the Indo-Pacific regions. We provide a methodological framework for estimating species richness in trees that may help refine species richness estimates of tree-dependent taxa

ELISA: European Linkage between Internet Integrated and Differentiated Services over ATM

Nowadays we are witnessing the growth of Internet at an unprecedented rate. However, the current Internet does not guarantee Quality of Service for user flows, which prevents the provision of good quality for multimedia streaming applications over long distance. This led to the development of the Integrated Services architecture and recently to the Differentiated Services architectures. On the other hand, ATM networks are being installed for the public infrastructure of B-ISDN throughout the world with advanced QoS capabilities to offer various service classes to customers. Considering these trends it seems important to network operators to integrate Internet protocols and the mature ATM QoS technology. This paper presents a specific approach for such an integration which is taken in the international project ELISA (European Experiment on the Linkage between Internet Integrated Services and ATM), funded by the EU through the ACTS programme. The approach is based on a combination of t..