摘要:

A survey of craniodental variability of the three allopatric populations of Leontopithecus reveals that they are morphologically heterogeneous and individually distinctive, with a nonclinal distribution of characters and pattern similarities. These observations correspond with their better known, starkly different coat coloration, and imply important ecological-adaptive differences. Leontopithecus chrysomelas contrasts markedly in its robust physique, relatively massive and anatomically modified incisors, comparatively small cheek teeth and unique cranial shape. Leontopithecus rosalia is smallest and most gracile, with a highly abbreviated premaxilla and reduced anterior dentition. Leontopithecus chrysopygus is quite the largest in most bodily and cranial dimensions yet is more similar to Leontopithecus rosalia in anterior tooth size and proportions, and has a massively built face. Phyletically, Leontopithecus is most closely related to Callithrix (incl. Cebuella) among the callitrichines. Protection of their habitats is urged for there are three times as many species of endangered Lion Tamarins as we had thought.

ISSN:0015-5713    

DOI:10.1159/000156159

出版商:S. Karger AG    

年代:1984

数据来源: Karger

摘要:

Food intake of captive cotton-top tamarins was measured at various stages of the life cycle and energy intake was calculated from the results. The intake of adults for maintenance was found to vary around 500 kj kg-¾ day-1 and to decrease with age. During the last 8 weeks of pregnancy, females increased in weight by about 2 g day-1 but energy intake did not show a marked rise above the maintenance range. During lactation, their energy intake appeared to double. Measurements of intake at various stages of growth were compared with a model of the energy requirements for growth which predicted intake quite closely. Compared with non-primate mammals of similar size, the growth rate of this species is slow, and because of this, the energy intake during growth and lactation is also comparatively low

ISSN:0015-5713    

DOI:10.1159/000156160

出版商:S. Karger AG    

年代:1984

数据来源: Karger

摘要:

Serum samples from 23 Pongo pygmaeus abelii, 4 Pongo pygmaeus pygmaeus and 2 hybrids were tested for Gm(1, 2, 3, 5, 6, 10, 11, 13, 14, 15, 16, 17, 21, 24, 28) and for Km (1) allotypes. All samples were negative for Gm (2, 3, 5, 6, 14, 16, 21, 28), Km (1) and positive for Gm (1, 15, 17, 24). The allotypes G3m (10, 11, 13) were simultaneously absent in all of the Bornean orangutans and present in all of the Sumatran orangutans. Moreover, the analysis of 8 Bm allotypes has shown that all the P. pygmaeus abelii and their hybrids only possess one Bm marker and that all the 4 P. pygmaeus pygmaeus are negative for all the antigens.

ISSN:0015-5713    

DOI:10.1159/000156161

出版商:S. Karger AG    

年代:1984

数据来源: Karger

摘要:

Two sets of censuses by enumeration (1971, 1981) of an isolated population of vervet monkeys on the island of St. Kitts were used to construct a model of the population history of the group. From a colonizing population, the best-fit model predicts a period of rapid expansion with high birth rates, then continued growth with slowly declining natality to the present population level. Several possible ‘futures’ for the population are projec

ISSN:0015-5713    

DOI:10.1159/000156162

出版商:S. Karger AG    

年代:1984

数据来源: Karger

摘要:

Interbirth intervals in a captive group of Japanese macaques were found to be shortened and inconsistently affected by stillbirth and infant loss within 6 months of life. The reduction in the length of the interval between successive births was in all probability the result of shorter periods of lactation and larger amounts of body fat stored by the well-nourished females of the study group.

ISSN:0015-5713    

DOI:10.1159/000156163

出版商:S. Karger AG    

年代:1984

数据来源: Karger

摘要:

Groups of monogamous, territorial gibbon apes (Hylobates spp.) are thought to interact through their loud calls, but there is little evidence that they do. We present evidence from observation of spontaneous calling and from playback experiments that an uncommon type of call bout produced by the lar gibbon (Hylobates lar), the ooaa duet, is highly infectious, triggering other groups to respond in kind.

ISSN:0015-5713    

DOI:10.1159/000156164

出版商:S. Karger AG    

年代:1984

数据来源: Karger

摘要:

The song of a male and a female hybrid gibbon (Hylobates pileatus × H. lar) is described. Comparison with the song of both parental species revealed that at least some of the hybrid’s song characteristics were inherited. Although several studies have tentatively suggested a genetical determination of gibbon song patterns, there have been no previous analyses of gibbon singing behaviour which conclusively documented this phenomenon. Attention is drawn to similarities between the song of the hybrids and gibbon species other than the parental ones, and their significance is consider

ISSN:0015-5713    

DOI:10.1159/000156165

出版商:S. Karger AG    

年代:1984

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156166

出版商:S. Karger AG    

年代:1984

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156158

出版商:S. Karger AG    

年代:1984

数据来源: Karger