摘要:

New primates are described from the Paleocene of North America and the most ancient known primates are diagnosed as the new suborder Paromomyiformes, a monophyletic higher category. Hitherto unknown species of the Paromomyiformes, probably of the Paromomyidae in Asia, and in either North America, Europe or possibly, but not likely in Africa, gave rise to the strepsirhines and haplorhines (tarsiiforms included).

ISSN:0015-5713    

DOI:10.1159/000155534

出版商:S. Karger AG    

年代:1973

数据来源: Karger

摘要:

Morphological evidence derived from the basicranium permits a high probability inference that cheirogaline lemurs, derived from lemurines, gave rise to the lorisid primates either in Africa or Asia. This conclusion is in harmony with other evidence known for both extinct and extant strepsirhines. Both cheirogaline lemurids and lorisids share advanced strepsirhine rather than primitive primate traits.

ISSN:0015-5713    

DOI:10.1159/000155535

出版商:S. Karger AG    

年代:1973

数据来源: Karger

摘要:

During a 6-month field study at the Awash River, Ethiopia, more than 180 hybrid baboons in three groups were found in a zone of about 20 km between anubis groups and hamadry as groups. The genetical structure of the hybrid zone was preliminarily described using a simple morphological hybrid index. An ecological borderline, not coinciding with either boundary of the hybrid zone, was found at the Awash Falls. Only one anubis group had advanced downstream beyond the falls, sharing this habitat with the hybrid and hamadryas groups. An ecological comparison was made between this anubis group, an anubis group from above the falls, one hybrid group, and one hamadryas group.

ISSN:0015-5713    

DOI:10.1159/000155536

出版商:S. Karger AG    

年代:1973

数据来源: Karger

摘要:

Populations of two subspecies of Presbytis senex were studied for nearly two years in two different areas in Ceylon. Within the high density population of P. s. senex, social changes involving the replacement of the leader male and infant deaths were observed in five one-male troops. Evidence to indicate that such changes may also be occurring in the lower density population of the other subspecies, P. s. monticola, is given. A possible scheme of long-term population changes in these two subspecies is proposed and its applicability to several other langur species is discussed. Explanations for certain aspects of mother-infant relationship and territorial behaviour among langurs are suggested.

ISSN:0015-5713    

DOI:10.1159/000155537

出版商:S. Karger AG    

年代:1973

数据来源: Karger

摘要:

Some aspects of the ecology of black colobus monkeys in nature are described in relation to their exploitation of their ecological niche and their association with other primates. The ‘jumping-roaring display’ of this species is compared with that of other colobus that have been studied up to the present in their natural biotop. Its possible social significance is evaluated. Some aspects of alimentation and reproduction are also descri

ISSN:0015-5713    

DOI:10.1159/000155538

出版商:S. Karger AG    

年代:1973

数据来源: Karger

摘要:

Vaginal cytology, cervical mucus, and serum LH were studied in adult female bonnet macaques (Macaca radiata). Ovulation was observed by laparoscopy. The cytology of vaginal smears and ferning pattern of cervical mucus were not well demarcated. Water content of cervical mucus increased gradually before ovulation and decreased soon after ovulation. The disc gel electrophoresis of cervical mucus revealed four bands. A single mid-cycle peak in serum LH concentration was detected in most cases. Basal LH concentration of approximately 500 ng/ml and LH surge of 2,000-2,500 ng/ml were observed between days 14 and 16.

ISSN:0015-5713    

DOI:10.1159/000155539

出版商:S. Karger AG    

年代:1973

数据来源: Karger

摘要:

The plasma patterns of oestrogens, progesterone and 17α-hydroxyprogesterone were studied during 18 normal menstrual cycles in 15 rhesus monkeys. Radioimmunoassays and competitive protein binding were used for the determination of the plasma levels of the steroids. The average patterns of the steroids in plasma and their relation to ovulation, menstruation and normality of the cycles studied are described

ISSN:0015-5713    

DOI:10.1159/000155540

出版商:S. Karger AG    

年代:1973

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000155541

出版商:S. Karger AG    

年代:1973

数据来源: Karger