Early Detection and Rapid Response

An invasion curve depicts the spread of invasive species over time and the cost of that spread. The longer an infestation goes untreated, the bigger the cost - to the resources as well as monetarily.

The invasion curve is adapted from Invasive Plants and Animals Policy Framework, State of Victoria, Department of Primary Industries, 2010. NPS Graphic/S. Sparhawk

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The Invasion Curve

Early Detection Rapid Response

Although we prefer to prevent invasive species from entering parks entirely, they sometimes still find their way in. Early Detection and Rapid Response (EDRR) means locating invasive species just as they are beginning to invade a particular area and quickly removing it. The goal is to discover new species as close to the black line (“Introduction of Species”) in the graphic above, because this is when we are most likely to be able to remove the species completely (also known as “eradication”).

Being able to discover a species while the population is still small can be very difficult, and requires using a number of tools, including predictive models, watch lists, regular monitoring, and the enlistment of observant park visitors. If you discover an invasive species in a park that is listed on a park or local watch list, you should report it to park staff.

To assist with reporting, NPS is currently working with Wild SpotterTM to add parks to its program. This includes a mobile app that allows the public to report watch list species findings. We are just beginning the work with Wild Spotter, but parks will be added over the next few years. Check back regularly to see if a park near you has been added!