Document Detail

First molar eruption, weaning, and life history in living wild chimpanzees.
MedLine Citation:
PMID:  23359695     Owner:  NLM     Status:  MEDLINE    
Understanding dental development in chimpanzees, our closest living relatives, is of fundamental importance for reconstructing the evolution of human development. Most early hominin species are believed to show rapid ape-like patterns of development, implying that a prolonged modern human childhood evolved quite recently. However, chimpanzee developmental standards are uncertain because they have never been based on living wild individuals. Furthermore, although it is well established that first molar tooth emergence (movement into the mouth) is correlated with the scheduling of growth and reproduction across primates broadly, its precise relation to solid food consumption, nursing behavior, or maternal life history is unknown. To address these concerns we conducted a photographic study of subadult chimpanzees (Pan troglodytes schweinfurthii) in Kanyawara, Kibale National Park, Uganda. Five healthy infants emerged their lower first molars (M1s) by or before 3.3 y of age, nearly identical to captive chimpanzee mean ages (∼3.2 y, n = 53). First molar emergence in these chimpanzees does not directly or consistently predict the introduction of solid foods, resumption of maternal estrous cycling, cessation of nursing, or maternal interbirth intervals. Kanyawara chimpanzees showed adult patterns of solid food consumption by the time M1 reached functional occlusion, spent a greater amount of time on the nipple while M1 was erupting than in the preceding year, and continued to suckle during the following year. Estimates of M1 emergence age in australopiths are remarkably similar to the Kanyawara chimpanzees, and recent reconstructions of their life histories should be reconsidered in light of these findings.
Tanya M Smith; Zarin Machanda; Andrew B Bernard; Ronan M Donovan; Amanda M Papakyrikos; Martin N Muller; Richard Wrangham
Related Documents :
23986075 - Effects of a healthy eating intervention on latina migrant farmworker mothers.
187515 - An international serotyping system for clostridium perfringens (welchii) type a in the ...
23315285 - Human dietary exposure to uranium in catalonia, spain.
23834595 - Towards metabolic robotics: insights from modeling embodied cognition in a biomechatron...
7996245 - Energy needs of companion animals: matching food intakes to requirements throughout the...
581385 - Effects of processing milk on concentrations of glucocorticoids in milk.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2013-01-28
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  110     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-02-22     Completed Date:  2013-04-26     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2787-91     Citation Subset:  IM    
Department of Human Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Pan troglodytes / physiology*
Tooth Eruption*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Membrane invaginations facilitate reversible water flux driving tunable iridescence in a dynamic bio...
Next Document:  Shp2 plays a crucial role in cell structural orientation and force polarity in response to matrix ri...