Summer Rainfall and Winter Sparrow Densities: A Test of the Food Limitation Hypothesis
- 1 January 1982
- journal article
- research article
- Published by Oxford University Press (OUP) in The Auk
- Vol. 99 (1) , 123-129
- https://doi.org/10.2307/4086028
Abstract
Published data on winter sparrow densities (from Christmas bird counts [National Audubon Society, USA]) and summer precipitation were used to test the hypothesis that local densities of wintering sparrows in southeastern Arizona are affected by the abundance of food. It is assumed, that the abundance of seeds available to wintering granivorous birds is correlated with the quantity of rainfall the previous summer. The results strongly supported 2 a priori predictions: the density of sparrows should be positively correlated with summer rainfall; and the density of individual sparrow species should be positively correlated with the total density of all other sparrow species. The findings provide further evidence that winter finch populations are food-limited and suggest that interspecific competition may be important in at least some avian communities.This publication has 16 references indexed in Scilit:
- The Use of Space by Wintering SparrowsEcology, 1977
- Dynamics of Bird Communities in the Chihuahuan Desert, New MexicoOrnithological Applications, 1976
- Competition and Niche Shifts of Mice Introduced onto Small IslandsOikos, 1976
- Competition and the Structure of Bird CommunitiesEvolution, 1975
- The Production and Utilization of Seeds in Plains Grassland of Southeastern ArizonaEcology, 1975
- Climatic Instability and the "Ecological Saturation" of Bird Communities in North American GrasslandsOrnithological Applications, 1974
- Species Diversity of Seed‐Eating Desert Rodents in Sand Dune HabitatsEcology, 1973
- The Feeding Ecology of Five Sympatric Finch SpeciesEcology, 1971
- On Bird Species DiversityEcology, 1961
- Population Ecology of Some Warblers of Northeastern Coniferous ForestsEcology, 1958