Biology Reference
In-Depth Information
information could be useful to guide early detection/rapid response activities to
areas of projected increasing population and to prioritize areas for control to areas
of projected stable populations.
6.5 Summary
In forecasting the spread of invasive species, there are many different tools available
and many different factors to consider. A combined approach of the different tech-
niques presented here along with a few improvements in the gathering of consistent
data through time should provide managers with information they need to perform
their jobs more effectively and efficiently. There are several different factors that
could potentially influence the rate of spread of a particular species (Table 6.2).
These factors should be important components of any models of the distribution or
abundance of a particular species in space or time, and should be considered in the
collection of field data. Much of this data is difficult to obtain, such as time since
invasion, number and frequency of introductions, population factors (such as allee
effects) and propagule supply. However, with increased awareness of the importance
of these data and technological advances, we should be able to improve our mode-
ling techniques to address at least some of these important factors.
Current techniques are also very species focused, and often all relate to com-
mon, dominant invasive species, not necessarily on what might be the next big
invader that will be important to detect early in its invasion. We need to become
better at applying the techniques we develop to different species, and at focusing
on species that may not yet be an extensive problem, but will be in the future if we
do not do anything to control the spread.
References
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Bradley, BA, JF Mustard (2006) Characterizing the landscape dynamics of an invasive plant and
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Colautti, RI, IA Grigorovich, HJ MacIsaac (2006) Propagule pressure: A null model for biological
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Crall, AW, LA Meyerson, TJ Stohlgren, et al (2006) Show me the numbers: what data currently
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