BIOGEOGRAPHICAL AND TOPOGRAPHICAL VARIATION IN THE PREY OF THE BLACK EAGLE IN THE CAPE PROVINCE, SOUTH-AFRICA

被引：30

作者：

BOSHOFF, AF

PALMER, NG

AVERY, G

DAVIES, RAG

JARVIS, MJF

机构：

[1] Nature and Environmental Conservation, Grahamstown, 6140

[2] Nature and Environmental Conservation, Stellenbosch, 7600

[3] South African Museum, Cape Town, 8000

[4] Marnmal Research Institute, University of Pretoria, Pretoria

[5] Nature and Environmental Conservation, Stellenbosch, 7600

来源：

OSTRICH | 1991年 / 62卷 / 1-2期

关键词：

D O I：

10.1080/00306525.1991.9639642

中图分类号：

Q95 [动物学];

学科分类号：

071002 ;

摘要：

Prey remains collected at or near Black Eagle Aquila verreauxii nest sites in the Cape Province, South Africa, were analysed according to frequency of occurrence of prey species in the samples. A total of 5748 prey individuals, collected from 73 sites, was analysed according to three biome groups and four nest site types. The Rock Hyrax Procavia capensis is the dominant prey species, but the eagles' diet spectrum varies according to its availability. Indices of species richness and diversity of the prey are inversely correlated with the proportion of the prey contributed by P. capensis, which in turn is determined by topography and vegetation. Biome has a greater influence on the indices than has nest site type. The age structure of the P. capensis prey remains closely reflects the juvenile:sub- adult:adult ratios in the biomes and at the nest site types. Medium-sized (approx. 1-4,5 kg) prey is usually taken. Juvenile domestic small-stock (lambs and goat kids) comprised only 3,4% of the overall total.

引用

页码：59 / 72

页数：14

共 28 条

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