Scaling Patterns in Exotic and Native Bird Species Distribution and Abundance

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Complexity Digest 2005.23 - 12
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06-Jun-2005

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Scaling Patterns in Exotic and Native Bird Species Distribution and Abundance,
SFI Working Papers
 









Abstract: Scaling phenomena are at the core of a great variety of ecological
processes ranging from individual physiology to population, community and
ecosystems, and emerge as the result of the operation of general principles
governing their structure and functioning. In this chapter, we assess the
generality of scaling relationships in the distribution and abundance of species
by comparing invasive exotics and native species recorded in the Breeding Bird
Survey within the North American continent. To do this we compare scaling
patterns in nine exotic species (the exotic set) and compare them to a set of
native species chosen to maximize taxonomic and ecological similarity (the
similar set) and to a random set of native species (the random set). For each
set of species we assessed the scaling of the spatial characteristics of range
occupancy, the intraspecific and interspecific scaling between distribution and
abundance and the scaling of the abundance frequency distribution. Our results
indicate that exotic and native species show similar scaling patterns in their
distribution and abundance, which suggests they are under the influence of
similar processes thus supporting the generality of these scaling relationships.
However, exotic species do differ from natives in a key aspect of their ecology;
they are able to reach higher maximum abundances and show a more even
abundance-distribution relationship, probably as a result of having broad
ecological tolerances, which could be a key to their successful establishment
and further spread.
Source: Scaling Patterns in Exotic and Native Bird Species Distribution and
Abundance[ http://www.santafe.edu/sfi/publications/wpabstract/200505019 ], Fabio
A. Labra, Sebastián R. Abades, Pablo A. Marquet, DOI: SFI-WP 05-05-019,
SFI Working Papers

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