Activities per year
Competing theoretical models make different predictions on which life history strategies facilitate growth of small populations. While ‘fast’ strategies allow for rapid increase in population size and limit vulnerability to stochastic events, ‘slow’ strategies and bet-hedging may reduce variance in vital rates in response to stochasticity. We test these predictions using biological invasions since founder alien populations start small, compiling the largest dataset yet of global herpetological introductions and life history traits. Using state-of-the-art phylogenetic comparative methods, we show that successful invaders have fast traits, such as large and frequent clutches, at both establishment and spread stages. These results, together with recent findings in mammals and plants, support ‘fast advantage’ models and the importance of high potential population growth rate. Conversely, successful alien birds are bet-hedgers. We propose that transient population dynamics and differences in longevity and behavioural flexibility can help reconcile apparently contrasting results across terrestrial vertebrate classes.
Bibliographical notePaper published as open access as required by funder (NERC).
- biological invasions
- comparative analyses
- invasion biology
- invasive species
- life history theory
- population dynamics
- population growth
- transient dynamics
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
Isabella Capellini (Keynote speaker)
Activity: Talk or presentation types › Invited or keynote talk at national or international conference