Statistical modelling of the population dynamics of a raptor community in a semi-desert environment
作者： Oliver Kruger , Richard Liversidge , Jan Lindstrom
DOI: 10.1046/J.1365-2656.2002.00626.X
关键词: Guild 、 Delayed density dependence 、 Biology 、 Ecology 、 Abundance (ecology) 、 Density dependence 、 Population growth 、 Biomass (ecology) 、 Interspecific competition 、 Population
摘要: Summary 1 We performed an extensive statistical modelling study on the population fluctuations and growth rates of 15 raptor species in Kalahari desert South Africa. 2 The correlation pattern between rainfall abundance changed systematically with body weight diet type. The heavier raptors feeding larger prey-items had lower correlations than lighter small prey-items. Whereas were more affected by immediate rainfall, large previous year. 3 Population abundances explained most parsimoniously direct delayed density dependence during current breeding season. Interspecific competition was never a predictor variable. Population best described fed dependence. 4 Population always dependence. strength positively correlated reproduction rate, due mainly to Falconiform having higher Accipitrid species. 5 Shifting from guild level, we found that biomass shares guilds did not vary significantly over time, supporting hypothesis constancy.
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