Effects of earthworms on soil structure and physical processes

1Laboratoire Biologie et Organisation des Sols Tropicaux, IRo, Fort-de-France, Martinique; 2Laboratoire d'Etude du Comportement des Sols Cultives, IRD, Montpellier, France; 3/CRAF, La Molina, Peru/Laboratoire d'Ecologie des Sols Tropicaux, IRo, Bondy, France; 5Laboratoire de Pedobiologie, IRo, Dakar, 5enegal; 6Department of Terrestrial Ecology and Nature Conservation, Agricultural University, Wageningen, the Netherlands; 7ICRAF/INIA, Estaci6n Experimental 'San Ram6n', Yurimaguas, Peru