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Occupancy-abundance models for predicting densities of three leaf beetles damaging the multipurpose tree Sesbania sesban in eastern and southern Africa

Published online by Cambridge University Press:  09 March 2007

G. Sileshi ,
G. Hailu  and
P.L. Mafongoya
G. Sileshi*
Affiliation:
World Agroforestry Centre (ICRAF), Zambia-ICRAF Agroforestry Project, PO Box 510089, Chipata, Zambia
G. Hailu
Affiliation:
World Agroforestry Centre (ICRAF), United Nations Avenue, Gigiri, PO Box 30677, Nairobi, 00100 GPO, Kenya
P.L. Mafongoya
Affiliation:
World Agroforestry Centre (ICRAF), Zambia-ICRAF Agroforestry Project, PO Box 510089, Chipata, Zambia
*
*PO Box 511118, Chipata, Zambia Fax: 260 6 221404 E-mail: sgwelde@yahoo.com
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Abstract

Mesoplatys ochroptera Stål, Exosoma and Ootheca spp. seriously damage sesbania, Sesbania sesban (L.) Merril, a multipurpose leguminous tree widely used in tropical agroforestry. This is discouraging farmers from expanding the planting of sesbania in various agroforestry systems in eastern and south-central Africa. Rapid methods are needed for estimation of population densities of these beetles for decisionmaking in pest management. A study was conducted with the objectives of determining the existence of any positive relationship between the occupancy and abundance of Mesoplatys, Exosoma and Ootheca and determining the model that best predicts abundance from occupancy for rapid estimation of population densities. The Poisson model assuming spatial randomness, the negative binomial distribution (NBD) model assuming spatial aggregation, the Nachman model without any distribution assumption, and a General model incorporating spatial variance-abundance and occupancy-abundance relationships were fitted to data on adult M. ochroptera, Exosoma and Ootheca from western Kenya, southern Malawi and eastern Zambia. Very strong variance to abundance relationships were observed in the spatial pattern of all three beetles. The occupancy-abundance relationships were also positive and strong in all beetles. The occupancy and abundance predicted by the four models were closest to the observed at lower densities compared with higher beetle densities. At higher population densities, the NBD and the General model gave better fit for M. ochroptera and Exosoma. For Ootheca populations, the Poisson and NBD models gave better fit at higher population densities. The relationships established here can be used as guide to estimate beetle densities for decision-making in pest management.

Keywords

binomial samplingExosomaMesoplatysOothecapower law
Type
Review Article
Information
Bulletin of Entomological Research , Volume 96 , Issue 1 , February 2006 , pp. 61 - 69
Copyright
Copyright © Cambridge University Press 2006

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