Patterns of abundance of invasive species

Invasive species are recognized as a leading driver of environmental change. Their impacts are often linked to their population size, but surprisingly little is known about how frequently they achieve high abundances. A nearly universal pattern in ecology is that species are rare in most locations and abundant in a few, generating right-skewed abundance distributions. Together with many collaborators, we collated abundance data from over 24,000 populations of 17 invasive and 104 native aquatic species to test whether invasive species differ from native counterparts in statistical patterns of abundance across multiple sites.

Invasive species on average reached significantly higher densities than native species and exhibited significantly higher variance. However, invasive and native species did not differ in terms of CV, skewness, or kurtosis. Abundance distributions of all species were highly right skewed, meaning both invasive and native species occurred at low densities in most locations where they were present (6% and 2% of the maximum densities observed within a taxa, respectively). The biological significance of the differences between invasive and native species depends on species-specific relationships between abundance and impact. Recognition of cross-site heterogeneity in population densities brings a new dimension to invasive species management, and may help to refine optimal prevention, containment, control, and eradication strategies.