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发帖数: 4290 | 1 http://www.sciencemag.org/content/337/6094/580.abstract
Unraveling the Life History of Successful Invaders
Abstract
Despite considerable current interest in biological invasions, the common
life-history characteristics of successful invaders remain elusive. The
widely held hypothesis that successful invaders have high reproductive rates
has received little empirical support; however, alternative possibilities
are seldom considered. Combining a global comparative analysis of avian
introductions (>2700 events) with demographic models and phylogenetic
comparative methods, we show that although rapid population growth may be
advantageous during invasions under certain circumstances, more generally
successful invaders are characterized by life-history strategies in which
they give priority to future rather than current reproduction. High future
breeding expectations reduce the costs of reproductive failure under
uncertain conditions and increase opportunities to explore the environment
and respond to novel ecological pressures. |
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