Birth-season variation in Japanese macaques,<Emphasis Type="Italic"> Macaca fuscata</Emphasis> |
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Authors: | Jack?Fooden Email author" target="_blank">Mitsuru?AimiEmail author |
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Institution: | (1) , Field Museum of Natural History, IL 60605-2496, Chicago, USA,;(2) Systematics and Phylogeny Section, Primate Research Institute, Kyoto University, Kanrin, Inuyama, Aichi 484-8506, Japan, |
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Abstract: | Japanese macaques, Macaca fuscata, exhibit an annual reproductive cycle that apparently is maintained intrinsically. Translocation of nine troops to new latitudes
within the northern hemisphere has had minimal effect on the timing of birth seasonality in these troops; translocation of
one troop to the southern hemisphere has resulted in a 6-month forward displacement of birth seasonality in this troop. Limited
available evidence indicates that, in the latitudinal zone between Toimisaki (31°22′N) and Kinkazan (38°17′N), mean birth
date in in-situ troops becomes earlier as latitude of troop localities increases; the same relationship between mean birth
date and latitude apparently does not apply to in-situ troops south and north of the Toimisaki–Kinkazan latitudinal zone.
Within the Toimisaki–Kinkazan latitudinal zone, earlier mean birth dates at higher latitudes may permit infants to achieve
an adequate level of development before the earlier onset of poor winter food conditions. South of the Toimisaki–Kinkazan
latitudinal zone, winters are relatively mild and may be less of a factor in infant survival; north of this zone, poor winter
food conditions persist so long that earlier infant births may be maladaptive.
Electronic Publication |
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Keywords: | Birth seasonality Japanese macaques Latitudinal variation Macaca fuscata Translocation |
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