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IMPORTANCE RESPECTIVE DU REPERAGE VISUEL ET AUDITIF (ABSENCE D'ECHOLOCATION) CHEZ M1CROCEBUS MURINUS par G.F. PARIENTE ( J ) Microcebus murinus, Lemurien a vision strictement nocturne, est capable de produire et de detecter des ultrasons. Cependant, Pabsence d'un d'echolocation est demontre ici, en insistant sur 1'importance de la detection et de remission d'ultrasons dans les comportements alimentaire et social. I -- INTRODUCTION Microcebus murinuSj le plus petit des Lemuriens de Madagascar, a un rythme d'activite strictement nocturne ; tres vif, il se deplace en foret de nuit par sauts successifs dans un large domaine vital oil ont lieu de nombreux contacts sociaux (Petter, 1962 ; Martin, 1972). Son regime alimentaire comporte line grande partie d'insectes* (Orthopteres et Lepidopteres) souvent captures au vol dans la vegetation. Ces differents elements, vivacite, mode de deplacement, vie sociale, regime, chez un animal strictement nocturne, actif des niveaux d'eclairement tres has (de l'ordre de quelques microlux scotopiques (Pariente, 1972), posent de fa^on aigue le probleme des moyens de reperage ou de detection (visuels, auditifs1 ou olfactifs). L'etude de la vision de cet animal ne pouvait etre envisaged sans exploser la possibilite d'un reperage par echolocation, d'autant plus que ce Microcebe est capable d'emettre des http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mammalia - International Journal of the Systematics, Biology and Ecology of Mammals de Gruyter

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