Daytime deliveries observed for the ring-tailed lemurs of the berenty reserve, Madagascar |
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Authors: | Yukio Takahata Naoki Koyama Naomi Miyamoto Megumi Okamoto |
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Affiliation: | (1) School of Policy Studies, Kwansei-Gakuin University, Gakuen 2-1, Sanda, 669-1337 Hyogo, Japan;(2) The Center for African Area Studies, Kyoto University, Yoshida, 606-8502 Kyoto, Japan;(3) The Graduate School of Humanities and Sciences, Kobe Gakuin University, Arise, Ikawadani-cho, Nishi-ku, 651-2180 Kobe, Japan |
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Abstract: | In the Berenty Reserve, Southern Madagascar, of the 16 deliveries recorded for ring-tailed lemurs from 1995 and 1997, 10 cases occurred during daytime hours (07:00 – 16:59). Four mothers lost contact with their troop members during parturition, but were able to rejoin them after about one hour. No attack from the individuals of the neighboring groups or predators on the mothers or their newborn infants was observed, whereas, other females of the mother’s own troop attacked them after delivery in two cases. Such daytime delivery may have originated from the circadian rhythm of the species’ nocturnal ancestors, who might have given birth during the daytime. This pattern may now be a non-adaptive feature, in agreement with the “evolutionary disequilibrium hypothesis (EVDH).” |
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Keywords: | Lemur catta Delivery Female competition EVDH |
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