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Invasive Species
Background

The Public Lands Department places a high level of importance on invasive species control in all of the Conservancy Lands areas.  Budgets may dictate otherwise, but staff strives for invasive species control as much as possible.  In fact the Conservancy Lands Master Plan states invasive species control as part of the number one goal.

The most common species encountered throughout the conservancy lands areas are: Buckthorn, Honeysuckle, Garlic Mustard, and Canada Thistle.  Other invasive species found in the conservancy lands include: Dame's Rocket, Multiflora Rose, Reed Canary Grass, Crown Vetch, and Yellow Sweet Clover.  This list could continue on, and helps explain the need for invasive species control.

What is an Invasive?

An invasive species, simply put, is one that can out-compete and overtake another specie(s) in a given area resulting in a loss in diversity and a change or loss in habitat type.  An exotic invasive is a species that is not native to the area (for example originates in Europe or Asia) and can very quickly dominate a landscape.  The lack of native predators, diseases, or competitors give these species an added advantage as well.  Many invasive species also exhibit traits that give them an advantage over the native species of an area: prolific seed production, early to sprout/late to drop leaves, grow in dense shade, inhibit other species from growing nearby.

Causes

Humans are the biggest factor in the spread of invasive species.  Historically, immigrants brought some species with them from the old world to remind them of home or for cooking purposes.  Today most species arrive as hitchhikers or for ornamental purposes.  Seeds can hitch a ride in any kind of soil brought in, aquatic species can be transported in bilge water.  Ornamental invasives end up being accidental, they were not originally thought to be invasive but end up being so (Norway Maple is a good example of this). 

Besides a species being from a different continent or brought by humans, changes in the disturbance regime of an ecosystem can lead to invasive species.  For example prairies and oak savanna ecosystems rely heavily on fire to maintain them.  Species that normally grow in these areas have become fire tolerant and some even require fire for seed distribution and/or germination.  Removal of fire not only inhibits these plants from surviving, but allows for others to move in.  Any tree, shrub, grass, or flower that was not fire tolerant can now survive there.  Over time this results in the loss of the prairie or oak savanna.

What can be done?

  • Knowledge of what the invasive species are in your area is very important.  With that information you can stop invasive species before they even start by not planting them.
  • Look at seed contents for invasive species.  Prairie seed mixes often contain seeds of invasive species in them.
  • In areas that already have invasive species in them, there are three main choices for removal/control:
    • Mechanical
    • Chemical
    • Biological

Mechanical and chemical controls are used in various Middleton Conservancy Lands areas.  We have found that this combination has shown the best results.  Proper signage is always posted whenever herbicides are used. 

For mechanical removal methods and chemical needs for various invasive species, use the following links: