Complex patterns of global spread in invasive insects : eco-evolutionary and management consequences
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Date
Authors
Garnas, Jeffrey R.
Auger-Rozenberg, Marie-Anne
Roques, Alain
Bertelsmeier, Cleo
Wingfield, Michael J.
Saccaggi, Davina Luisa
Roy, Helen E.
Slippers, Bernard
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
Abstract
The advent of simple and affordable tools for molecular identification of novel insect
invaders and assessment of population diversity has changed the face of invasion biology in
recent years. The widespread application of these tools has brought with it an emerging
understanding that patterns in biogeography, introduction history and subsequent movement
and spread of many invasive alien insects are far more complex than previously thought. We
reviewed the literature and found that for a number of invasive insects, there is strong and
growing evidence that multiple introductions, complex global movement, and population
admixture in the invaded range are commonplace. Additionally, historical paradigms related
to species and strain identities and origins of common invaders are in many cases being challenged. This has major consequences for our understanding of basic biology and ecology
of invasive insects and impacts quarantine, management and biocontrol programs. In addition,
we found that founder effects rarely limit fitness in invasive insects and may benefit
populations (by purging harmful alleles or increasing additive genetic variance). Also, while
phenotypic plasticity appears important post-establishment, genetic diversity in invasive
insects is often higher than expected and increases over time via multiple introductions.
Further, connectivity among disjunct regions of global invasive ranges is generally far higher
than expected and is often asymmetric, with some populations contributing disproportionately
to global spread. We argue that the role of connectivity in driving the ecology and evolution
of introduced species with multiple invasive ranges has been historically underestimated and
that such species are often best understood in a global context.
Description
Keywords
Admixture, Bridgehead effects, Invasion genetics, Invasive species management, Multiple introductions
Sustainable Development Goals
Citation
Garnas, J, Auger-Rozenberg, M-A, Roques, A, Bertelsmeier, C, Wingfield, MJ, Saccaggi, DL, Roy, HE & Slippers, B 2016, 'Complex patterns of global spread in invasive insects : eco-evolutionary and management consequences', Biological Invasions, vol. 18, no. 4, pp. 935-952.