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Régime alimentaire d’un ver de terre anécique des savanes colombiennes : une remise en question des types écologiques

Abstract : An ecological classification based on a set of morphological characters may be used to describe earthworm functions in soil. However these relationships have been seldom verified. Gizzards of the earthworm Martiodrilus carimaguensis (Glossoscolecidae) were studied to find out if its anecic morphology was in agreement with its diet (shallow litter remains and deep organo-mineral material). By direct observation of 13 adults’ gizzard contents with a dissecting and a phase contrast microscope, the volumetric percentage of plant fragments, roots, amorphous organic matter and mineral particles reached respectively 63, 5, 6.5 and 30 % v/v. Eighty percent of plant fragments were microscopic, and mostly incorporated into the organo-mineral earthworm casts well preserved in the gizzard. Coprophagy and rhizophagy were the dominant feature of M. carimaguensis diet. Yet, the casts produced revealed a high variability in its diet, what could be related to transitional adoption of a typical anecic diet during some periods.
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https://hal.inria.fr/hal-01618244
Contributor : Nicolas Bernier Connect in order to contact the contributor
Submitted on : Tuesday, October 17, 2017 - 3:58:27 PM
Last modification on : Wednesday, March 9, 2022 - 5:18:04 PM

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Nicolas Bernier, Lucero Mariani, Juan José Jiménez, Thibaud Decaens. Régime alimentaire d’un ver de terre anécique des savanes colombiennes : une remise en question des types écologiques. Comptes rendus de l’Académie des sciences. Série III, Sciences de la vie, Elsevier, 2001, 324 (8), pp.733 - 742. ⟨10.1016/S0764-4469(01)01351-8⟩. ⟨hal-01618244⟩

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