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A search for stability gradients in North American breeding bird communities

Auk

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Abstract

To search for the existence of stability gradients in North American breeding land bird communities we operationally defined stability (after Jarvinen 1979) as year-to-year persistence in species composition and distribution of species abundances. From the census data for 174 study plots we derived nine indices that estimate the annual variability of species composition, the species abundance distribution, diversity, and breeding density. The resulting matrix of study plot by stability indices was used to estimate the correlation structure of the stability indices. The correlation matrix was, in turn, subjected to a principal components analysis to derive synthetic gradients of variation. We then searched for patterns of variation in these stability gradients associated with either geographic location or habitat type. Three independent principal component axes reproduced most of the variation in the initial data and were interpreted as gradients of variation in species turnover, diversity, and breeding abundance. Thus, the annual stability of community structure apparently responds independently to species and abundance variation. Despite the clarity of the derived gradients, few patterns emerged when the plots were ordinated by either habitat or geographic location. In general, grasslands showed greater annual variation in diversity than forested habitats, and, for some habitats, northern communities were less stable than more southern communities. However, few of these patterns were very strong, and we interpret them cautiously.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A search for stability gradients in North American breeding bird communities
Series title:
Auk
Volume
102
Issue:
1
Year Published:
1985
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
64-81
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
64
Last page:
81
Number of Pages:
18