Intraspecific aggregation decreases local species diversity of arthropods
Authors
Veech, Joseph A.
Crist, Thomas O.
Summerville, Keith S.
Issue Date
2003
Type
Article
Language
en_US
Keywords
Arthropods , Intraspecific aggregation , Macroecology , Neutral model , Species diversity
Alternative Title
Abstract
Abstract. The aggregation model of species coexistence predicts that insect species diversity within a community is maintained by intraspecific aggregation among resource patches. An untested corollary of this prediction is that diversity within resource patches should decrease with increasing intraspecific aggregation. The recently derived species–aggregation relationship provides a general formulation of this prediction: as intraspecific aggregation increases within a geographic area, the species richness within samples of the area decreases. We tested this prediction by compiling and analyzing 76 data sets of arthropod species distribution and abundance. For each data set, we determined the mean amount of intra- and interspecific aggregation and three types of within-sample or local species diversity: species richness, evenness, and dominance. Using regression, we found a negative relationship between intraspecific aggregation and all three types of local diversity. Intraspecific aggregation explained a significant percentage of the variation in species diversity, typically between 20% and 60%. By comparison, interspecific aggregation usually explained <1% of the variation in species diversity. Our study provides empirical
support for the species–aggregation relationship as a general macroecological pattern that emerges from intraspecific aggregation.
Description
Keith S. Summerville ia a professor of Environmental Science in the Department of Environmental Science and Policy at Drake University. He can be contacted at keith.summerville@drake.edu
Citation
Ecology, 84(12), 2003, pp. 3376–3383
Publisher
Ecological Society of America
License
Journal
Volume
Issue
PubMed ID
DOI
ISSN
0012-9658