A comparative study of litter size and sex composition in a large dataset of callitrichine monkeys.
birth sex ratio
callitrichine
litter size
sibling competition
studbook
Journal
American journal of primatology
ISSN: 1098-2345
Titre abrégé: Am J Primatol
Pays: United States
ID NLM: 8108949
Informations de publication
Date de publication:
09 2019
09 2019
Historique:
received:
17
05
2019
revised:
15
07
2019
accepted:
16
07
2019
pubmed:
8
8
2019
medline:
6
6
2020
entrez:
8
8
2019
Statut:
ppublish
Résumé
In many birds and mammals, the size and sex composition of litters can have important downstream effects for individual offspring. Primates are model organisms for questions of cooperation and conflict, but the factors shaping interactions among same-age siblings have been less-studied in primates because most species bear single young. However, callitrichines (marmosets, tamarins, and lion tamarins) frequently bear litters of two or more, thereby providing the opportunity to ask whether variation in the size and sex composition of litters affects development, survival, and reproduction. To investigate these questions, we compiled a large dataset of nine species of callitrichines (n = 27,080 individuals; Callithrix geoffroyi, Callithrix jacchus, Cebuella pygmaea, Saguinus imperator, Saguinus oedipus, Leontopithecus chrysomelas, Leontopithecus chrysopygus, Leontopithecus rosalia, and Callimico goeldii) from zoo and laboratory populations spanning 80 years (1938-2018). Through this comparative approach, we found several lines of evidence that litter size and sex composition may impact fitness. Singletons have higher survivorship than litter-born peers and they significantly outperform litter-born individuals on two measures of reproductive performance. Further, for some species, individuals born in a mixed-sex litter outperform isosexually-born individuals (i.e., those born in all-male or all-female litters), suggesting that same-sex competition may limit reproductive performance. We also document several interesting demographic trends. All but one species (C. pygmaea) has a male-biased birth sex ratio with higher survivorship from birth to sexual maturity among females (although this was significant in only two species). Isosexual litters occurred at the expected frequency (with one exception: C. pygmaea), unlike other animals, where isosexual litters are typically overrepresented. Taken together, our results indicate a modest negative effect of same-age sibling competition on reproductive output in captive callitrichines. This study also serves to illustrate the value of zoo and laboratory records for biological inquiry.
Identifiants
pubmed: 31389057
doi: 10.1002/ajp.23038
pmc: PMC6949018
mid: NIHMS1060485
doi:
Types de publication
Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
e23038Subventions
Organisme : NIH HHS
ID : P51 OD011133
Pays : United States
Organisme : Army Research Office
Pays : International
Organisme : National Defense Science and Engineering Graduate (NDSEG) Fellowship
ID : 32 CFR 168a
Pays : International
Organisme : Theodore H. Ashford Graduate Fellowship in the Sciences
Pays : International
Informations de copyright
© 2019 Wiley Periodicals, Inc.
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