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      Host specificity of ambrosia and bark beetles (Col., Curculionidae: Scolytinae and Platypodinae) in a New Guinea rainforest

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      Ecological Entomology
      Wiley-Blackwell

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          Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness

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            A new statistical approach for assessing similarity of species composition with incidence and abundance data

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              Low host specificity of herbivorous insects in a tropical forest.

              Two decades of research have not established whether tropical insect herbivores are dominated by specialists or generalists. This impedes our understanding of species coexistence in diverse rainforest communities. Host specificity and species richness of tropical insects are also key parameters in mapping global patterns of biodiversity. Here we analyse data for over 900 herbivorous species feeding on 51 plant species in New Guinea and show that most herbivorous species feed on several closely related plant species. Because species-rich genera are dominant in tropical floras, monophagous herbivores are probably rare in tropical forests. Furthermore, even between phylogenetically distant hosts, herbivore communities typically shared a third of their species. These results do not support the classical view that the coexistence of herbivorous species in the tropics is a consequence of finely divided plant resources; non-equilibrium models of tropical diversity should instead be considered. Low host specificity of tropical herbivores reduces global estimates of arthropod diversity from 31 million (ref. 1) to 4 6 million species. This finding agrees with estimates based on taxonomic collections, reconciling an order of magnitude discrepancy between extrapolations of global diversity based on ecological samples of tropical communities with those based on sampling regional faunas.
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                Author and article information

                Journal
                Ecological Entomology
                Ecol Entomol
                Wiley-Blackwell
                0307-6946
                1365-2311
                December 2007
                December 2007
                : 32
                : 6
                : 762-772
                Article
                10.1111/j.1365-2311.2007.00939.x
                edb1206d-6163-4505-a7c0-1be52c8ff568
                © 2007

                http://doi.wiley.com/10.1002/tdm_license_1.1

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