Economic Determinants of Invasion and Discovery of Nonindigenous Insects
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Introductions of nonindigenous organisms into the United States have been linked to
international trade. The individual contributions of imports, immigration, and international
travel, however, are poorly understood because introduction dates are unavailable. We
examine relationships between economic trends and discoveries of nonindegenous insects
and use these relationships to infer the timing and determinants of introductions. We find
that a few variables can explain much variation in species introductions and identifications.
The most significant contributor to the introduction appears to be agricultural imports.
Currently available proxies for academic effort are weak determinants of the probability
that introduced species are identified.