Doubting Thomas and the Love of Invasive Species.

In a [5] article (Thomas & Lennon [5]), it was observed that for birds "[t]he northern margins of southerly species have moved north by an average of 18.9 km in 20 years", but "the southern margins of northerly species have not shifted consistently." The sunny disposition in this book contrasts with his own highly cited article, "Extinction Risk from Climate Change" that predicted 15-37% of species will be at risk due to climatic change (Thomas et al. [6]). Extinction debt is the phenomenon in which a habitat can have enhanced biodiversity, above its natural capacity, because the species "committed to extinction" have not yet gone extinct (Thomas et al. [6]). But be doubtful though - be very doubtful - of the more radical remarks claiming that the other scientists (such as invasion ecologists) have it all wrong, that invasive species are just going to enrich ecosystems or that climate change is going to increase biodiversity. [Extracted from the article]