摘要:

This investigation was concerned with the dimensions of the facial skeleton and the incidence of underbite in colobine monkeys. Standard craniofacial dimensions and the notation of the presence or absence of underbite were recorded for skulls of 308 adult, wild-caught colobines belonging to 10 species. Underbite was noted in all species examined, ranging in frequency from 10% in Colobuspolykomos to 100% in 2 species of Presbytis. Univariate statistics indicate that species with high frequencies of underbite tend to have shorter, broader maxillary dental arches, shorter faces and rostrums, and longer mandibular dental arches. A multivariate discriminant analysis supported the univariate statistics. Interspecific allometric analysis of facial measurements against a constructed size variable indicated that maxillary dimensions scale in a strongly positive manner in relation to size. However, mandibular dimensions tend to scale isometrically. This pattern of facial scaling indicates that the tendency toward underbite should increase as overall size decreases. This would explain why smaller species have higher frequencies of underbite than larger species and why females often have a higher incidence of underbite than conspecific males. Zingeser [5] has suggested that the high incidence of underbite in colobine and some cebid monkeys is an adaptation to folivory. The results of this study support an alternative hypothesis that the high incidence of underbite in colobine monkeys is related to the pattern of facial scaling with size in combination with relaxed selection on the anterior dentition.

ISSN:0015-5713    

DOI:10.1159/000156627

出版商:S. Karger AG    

年代:1992

数据来源: Karger

摘要:

A 10-year-old Western lowland gorilla, already caring for her own 14-month-old son, adopted a female neonate. The infant’s mother (aged 7 years, 4 months) showed no interest in the infant, and it is unclear whether she abandoned the infant or whether it was seized by the dominant foster-mother. The foster-mother gave more maternal attention to the adoptee than to her own son but gave both infants the same protection. She adjusted her forms of transport to the age of each infant. The subadult mother of the neonate did not seek contact with her offspring during the first 4 weeks and in fact showed more interest in the 14-month-old male infant. Interactions between the two mothers were rare. The foster-mother’s own male infant died 2 months after she had adopted the female infant. She looked after the adopted infant for 1 year, but then lost interest so that the adoptee had to be separa

ISSN:0015-5713    

DOI:10.1159/000156628

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156629

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156630

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156631

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156632

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156633

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156634

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156635

出版商:S. Karger AG    

年代:1992

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156636

出版商:S. Karger AG    

年代:1992

数据来源: Karger