Barois I. auteur aut IRD Lavelle P. auteur aut IRD Brossard Michel auteur aut IRD Tondoh Jérôme auteur aut IRD Angeles Martinez M. de los auteur aut IRD Rossi J.P. auteur aut IRD Senapati B.K. auteur aut IRD Angeles A. auteur aut IRD Fragoso C. auteur aut IRD Jimenez J.J. auteur aut IRD Decaëns Thibaud auteur aut IRD Lattaud C. auteur aut IRD Kanyonyo J. auteur aut IRD Blanchart Eric auteur aut IRD Chapuis Lydie auteur aut IRD Brown George auteur aut IRD Moreno A. auteur aut IRD text bookSection eng text/pdf reformatted digital access Ecological and demographic parameters of 26 species of native and exotic earthworms species common in tropical agroecosystems, with large environmental tolerance and/or extended distribution were investigated. Principal component analysis (PCA) isolated four groups : (i) large native endogeic and anecic species (16-32 g individual fresh wt) with long generation time (2-4 years), low fecundity (0.5-3.1 cocoons/year/adult) and one hatchling per cocoon ; (ii) medium size species (1.2-6 g) endogeic mesohumic, with intermediate fecundity (1.3-45 cocoons/year/adult) ; (iii) small species (0.17-1.25 g f.w.) mainly endogeic polyhumic, with short generation time (3-7 months), intermediate fecundity (10-68 cocoons/year/adult) and one hatchling per cocoon ; and (iv) generally small (80-150 mg f.w.) species mainly exotic and epigeic, with short generation time (1-3 months), very high fecundity (50-350 cocoons/year/adult) and up to three hatchlings per cocoon. Casts may be either large globular or small granular. The selective investigations of large organic particles and small mineral particles (clays) concentrates total organic matter in the casts. There is an intense mineralization rate of nitrogen in the casts (6-29% of organic N), exotic worms seeming to be less efficient than natives at mineralizing N. The mineral phosphorus content of casts is always at least 30% higher than in the non-ingested soil. All these worms ingest daily, on average, three times their own weight of soil at the adult stage (1-9) and much more when juvenile ; up to 1000 Mg dry soil/ha may transit yearly through earthworm guts. (Résumé d'auteur) specialized LOMBRIC STRUCTURE DU SOL ECOLOGIE DYNAMIQUE DE POPULATION FECONDITE CLASSIFICATION DISTRIBUTION SPATIALE MATIERE ORGANIQUE MINERALISATION AZOTE NUTRIMENT PHOSPHORE ZONE TROPICALE 074FAUSOL03 Lavelle P. ed. edt IRD Brussaard L. ed. edt IRD Hendrix P. ed. edt IRD 57-85 Wallingford CABI 1999 https://www.documentation.ird.fr/hor/fdi:010021556 0-85199-270-6 [F A010021553] https://www.documentation.ird.fr/hor/fdi:010021556 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers16-03/010021556.pdf IRD - Base Horizon / Pleins textes 2000-06-05 2016-04-01 fdi:010021556 fre