Population growth lags in introduced species

Number of health care workers lags behind population growth.

Population structure in the native range predicts the spread of introduced marine species

Forecasting invasion success remains a fundamental challenge in invasion biology. The effort to identify universal characteristics that predict which species become invasive has faltered in part because of the diversity of taxa and systems considered. Here, we use an alternative approach focused on the spread stage of invasions. FST, a measure of alternative fixation of alleles, is a common pro...

Negative Effects of an Introduced Bird Species on Growth and Survival in a Native Bird Community

Exploitative competition is a major determinant of community structure in natural assemblages [1, 2], but, introduced species are rarely competitors that lead to extinction of native species [3, 4]. Here we document strong community-wide competition from the Japanese white-eye (Zosterops japonicus) on native Hawaiian passerine birds. Introduced in 1929 [5], white-eye successfully invaded old-gr...

Quantifying Differences Between Native and Introduced Species.

Introduced species have historically been presumed to be evolutionarily novel and 'different' from native species. Recent studies question these assumptions, however, as the traits and factors promoting successful introduced and native species can be similar. We advocate a novel statistical framework utilizing quantifiable metrics of evolutionary and ecological differences among species to test...

Alien species and interspecific competition: effects of introduced eastern grey squirrels on red squirrel population dynamics

1. Throughout much of Britain, Ireland and north Italy, red squirrels ( Sciurus vulgaris L.) have been replaced by alien grey squirrels ( S. carolinensis Gmelin) introduced from North America. We have studied squirrels in two mixed woodlands in north Italy and two conifer forests in north England. In each country, one site was occupied by red squirrels and one site by both species. 2. We have p...