Picking a tree: habitat use by the tree agama, Acanthocercus atricollis atricollis, in South Africa
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Picking a tree: habitat use by the tree agama, Acanthocercus atricollis atricollis, in South Africa
INTRODUCTION Habitat selection by animals has been defined as the active choice of an area from a range of alternatives in the absence of constraints (Partridge 1978). In reality, no area is free of constraints and habitat selection depends on the physical structure of the environment, the physiology of the animal, food availability and protection from predators (Ward & Lubin, 1993). There are ...
متن کاملLife on a limb: ecology of the tree agama (Acanthocercus a. atricollis) in southern Africa
One hundred and sixty-four museum specimens of the tree agama Acanthocercus a. atricollis were measured and dissected to examine sexual size dimorphism, reproduction and diet. Foraging mode and behaviour were also quanti®ed in a wild population to obtain a broader picture of their foraging ecology and to test the hypothesis that tree agamas are ambush foragers. Males and females did not differ ...
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Chemical signals have an important role in the reproductive behaviour of many lizards. However, the compounds secreted by their femoral or preanal glands, which may be used as sexual signals, are mainly known for lizard species within the Scleroglossa clade, whereas compounds in secretions of lizards within the Iguania clade are much less studied. Based on mass spectra, obtained by GC-MS, we fo...
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I studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean +/- sd) 62% +/- 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). O...
متن کاملUse of classification tree methods to study the habitat requirements of tench (Tinca tinca) (L., 1758)
Classification trees (J48) were induced to predict the habitat requirements of tench (Tinca tinca). 306 datasets were used for the given fish during 8 years in the river basins in Flanders (Belgium). The input variables consisted of the structural-habitat (width, depth, gradient slope and distance from the source) and physic chemical (pH, dissolved oxygen, water temperature and electric conduct...
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ژورنال
عنوان ژورنال: African Zoology
سال: 2003
ISSN: 1562-7020,2224-073X
DOI: 10.1080/15627020.2003.11407281