Predictors of Introduction Success in the South Florida Avifauna |
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Authors: | Craig R Allen |
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Institution: | (1) USGS – Nebraska Cooperative Fish and Wildlife Research Unit, University of Nebraska, 111 Mussehl Hall, 38th and Fair Streets, Lincoln, NE 68583-0711, USA |
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Abstract: | Biological invasions are an increasing global challenge, for which single-species studies and analyses focused on testing
single hypotheses of causation in isolation are unlikely to provide much additional insight. Species interact with other species
to create communities, which derive from species interactions and from the interactions of species with the scale specific
elements of the landscape that provide suitable habitat and exploitable resources. I used logistic regression analysis to
sort among potential intrinsic, community and landscape variables that theoretically influence introduction success. I utilized
the avian fauna of the Everglades of South Florida, and the variables body mass, distance to nearest neighbor (in terms of
body mass), year of introduction, presence of congeners, guild membership, continent of origin, distribution in a body mass
aggregation or gap, and distance to body-mass aggregation edge (in terms of body mass). Two variables were significant predictors
of introduction success. Introduced avian species whose body mass placed them nearer to a body-mass aggregation edge and further
from their neighbor were more likely to become successfully established. This suggests that community interactions, and community
level phenomena, may be better understood by explicitly incorporating scale. |
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Keywords: | community assembly cross-scale Everglades exotic species introduced species landscape structure scale textural-discontinuity hypothesis |
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