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Biodiversity and abundance of terrestrial isopods along a gradient of disturbance in Sabah, East Malaysia (Articolo in rivista)

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Biodiversity and abundance of terrestrial isopods along a gradient of disturbance in Sabah, East Malaysia (Articolo in rivista) (literal)

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M. Hassal; D.T. Jones; S. Taiti; Z. Latipi; S.L. Sutton: M. Mohammed (2006)
Biodiversity and abundance of terrestrial isopods along a gradient of disturbance in Sabah, East Malaysia
in European journal of soil biology; Elsevier France - Editions Scientifiques Medicales Elsevier, Paris (Francia)
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Centre for Ecology Evolution and Conservation, School of Environmental Sciences, University of East Anglia, Norwich NR4 7JT, UK Soil Biodiversity Research Group, Entomology Department, British Natural History Museum, Cromwell Road, London SW7 5BD, UK Istituto per lo Studio degli Ecosistemi, Consiglio Nazionale delle Ricerche, Via Madonna del Piano, 50019 Sesto Fiorentino, Florence, Italy Tropical Biology and Conservation Institute, University of Malaysia Sabah, Beg Berkunci 2073, 88999 Kota Kinabalu, Sabah, Malaysi (literal)

Titolo

Biodiversity and abundance of terrestrial isopods along a gradient of disturbance in Sabah, East Malaysia (literal)

Abstract

Connell's intermediate disturbance hypothesis predicts that the highest diversity is maintained at intermediate levels of disturbance. We have examined this hypothesis by observing differences in biodiversity of terrestrial isopods along a gradient of disturbance from two undisturbed primary tropical rainforest sites, to a logged site, a mixed native fruit orchard and a commercial oil palm plantation, in Sabah, East Malaysia. We describe a standardised protocol for the rapid assessment of isopod biodiversity on tropical forest floor sites and for measuring environmental variables to which we have related differences in species richness and relative abundance of the isopods. The results do not support Connell's hypothesis because there were no significant differences in diversity, species richness or equitability between disturbed sites and the nearest primary forests. The relative abundance of individual species was highest in the most disturbed environment. We suggest that this may be because particular species are well adapted to exploiting resources under the more 'r' selection conditions created by disturbance. Possible reasons for why the observations do not conform with predictions from the intermediate disturbance hypothesis are discussed. We conclude that Huston's dynamic equilibrium model is more appropriate than the intermediate disturbance hypothesis in predicting the effects of disturbance of tropical rainforests on these arthropod macro-decomposers. (literal)

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