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After short interbirth intervals, captive callitrichine monkeys have higher infant mortality. 2022
Brett M Frye, and
Dakota E McCoy, and
Jennifer Kotler, and
Amanda Embury, and
Judith M Burkart, and
Monika Burns, and
Simon Eyre, and
Peter Galbusera, and
Jacqui Hooper, and
Arun Idoe, and
Agustín López Goya, and
Jennifer Mickelberg, and
Marcos Peromingo Quesada, and
Miranda Stevenson, and
Sara Sullivan, and
Mark Warneke, and
Sheila Wojciechowski, and
Dominic Wormell, and
David Haig, and
Suzette D Tardif
Department of Biology, Emory & Henry College, Emory, VA 24327, USA.
Life history theory predicts a trade-off between the quantity and quality of offspring. Short interbirth intervals-the time between successive births-may increase the quantity of offspring but harm offspring quality. In contrast, long interbirth intervals may bolster offspring quality while reducing overall reproductive output. Further research is needed to determine whether this relationship holds among primates, which have intensive parental investment. Using Cox proportional hazards models, we examined the effects of interbirth intervals (short, normal, or long) on infant survivorship using a large demographic dataset (n = 15,852) of captive callitrichine monkeys (marmosets, tamarins, and lion tamarins). In seven of the nine species studied, infants born after short interbirth intervals had significantly higher risks of mortality than infants born after longer interbirth intervals. These results suggest that reproduction in callitrichine primates may be limited by physiologic constraints, such that short birth spacing drives higher infant mortality.
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