Journal
BIOLOGICAL INVASIONS
Volume 16, Issue 3, Pages 591-607Publisher
SPRINGER
DOI: 10.1007/s10530-013-0610-0
Keywords
Biological invasions; Global experiments; Invasion hypotheses; Model species; Native versus home comparison; Pinus contorta; Tree invasions
Categories
Funding
- TC4F program
- Swedish research council FORMAS
- New Zealand Ministry of Business, Innovation
- Employment's Science and Innovation Group
- NSF-WildFIRE PIRE [OISE 09667472]
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Hypotheses for explaining plant invasions have focused on a variety of factors that may influence invasion success, including propagule pressure, interactions of the introduced species with the biotic, abiotic, or disturbance properties of the new ecosystem, or the genetic characteristics of the invader itself. Evaluating the relative importance of these factors has been difficult because for most invaders key information about the introduced population or the introduction event is not available. We propose that natural experiments using model species is an important tool to test multiple invasion hypotheses at the same time, providing a complementary approach to meta-analysis and literature review. By focusing on a single candidate species, Pinus contorta, we explore several attributes that we propose constitute a good model, including: (a) intentional and relatively well documented introduction into a wide range of environments and countries across the world during the past century, where invasion success or failure has already occurred, (b) conspicuous growth form that simplifies assessment of growth rates, and comparisons across native and introduced ecosystems around the world, and, (c) documented and replicated variability of introduction intensity, genetic characteristics of the introduced populations, contrasting biotic communities present at sites of introduction, and abiotic conditions within and across introduced ecosystems. We propose that identifying model species with these characteristics will provide opportunities to disentangle the relative importance of different mechanisms hypothesized to influence invasion success, and thereby advance the field of invasion ecology.
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