摘要:

A recent discussion of the anterior teeth of adapids led to the conclusion that similarities to anthropoids are convergent. It is shown here that alternative functional and phylogenetic inteφretations can be supported. These alternative inteφretations are based on a different perspective on the anterior dentitions of extant and fossil anthropoids, which cannot be characterized by a single pattern of morphology and occlusion. More importantly, when this interspecific variation is placed within a phylogenetic framework it reveals persistent evolutionary trends that can be extrapolated back to infer a modest range of probable conditions in an Eocene anthropoid ancestor. The moφhology and occlusion of adapid anterior teeth fall within this extrapolated range. This is compatible with an adapid ancestry for anthropoi

ISSN:0015-5713    

DOI:10.1159/000156872

出版商:S. Karger AG    

年代:1995

数据来源: Karger

摘要:

Ranging and foraging patterns observed during a field study of the behavioral ecology of Ateles belzebuth belzebuth are analysed in the context of temporal and spatial variation in the distribution of plant resources at the study site. The study group exhibited two basic patterns of foraging behaviour and habitat exploitation, which appeared to correlate with the observed variation in resource availability. During the dry season, when the relative abundance of fruit decreased, the spider monkeys ranged over a smaller area, repeatedly visiting a few intensively used fruiting and sleeping trees. As fruit abundance increased during the course of the wet season, the study group expanded its range, and both the daily path length and the number of fruiting trees visited increased daily. These patterns are analysed and evaluated in relation to foraging strategies.

ISSN:0015-5713    

DOI:10.1159/000156873

出版商:S. Karger AG    

年代:1995

数据来源: Karger

摘要:

Three wild-caught Sri Lankan and two captive-bred slender lorises (Loris tardigradus) in Adelaide Zoo, South Australia, were karyotyped from leucocyte cultures. The founder male and one of the founder females were of the grey subspecies L. tardigradus grandis, of which L. tardigradus nordicus is probably a synonym. The other founder female was a small red-brown L. tardigradus tardigradus. All three wild-caught individuals were karyotypically distinct from each other and their offspring showed the expected heterozygosity. The L. tardigradus tardigradus karyotype was no more distinct from the grey subspecies karyotypes than they were from each other. On present evidence, Indian and Sri Lankan lorises appear to be chromosomally distinct.

ISSN:0015-5713    

DOI:10.1159/000156874

出版商:S. Karger AG    

年代:1995

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156875

出版商:S. Karger AG    

年代:1995

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156876

出版商:S. Karger AG    

年代:1995

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000156877

出版商:S. Karger AG    

年代:1995

数据来源: Karger