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R.A. Smith National, Inc. Knowledge Blog

Regulation of the Invasive Species Takeover

by Theran Stautz 25. February 2016 13:14

Our native landscape is our home, the little world we live in, where we are born and where we play, where we grow up, and finally where we are… laid to eternal rest. It speaks of the distant past and carries our life in the tomorrow. To keep this pure and unadulterated is a sacred heritage and noble task of the highest cultural value. 
— Jens Jensen, landscape architect, 1860-1951

Theran Stautz, ecologist/project manager

Invasive species, both animal and vegetative, are becoming an increasingly large problem in the United States. Nationally, billions of dollars are spent every year by private landowners, municipalities, non-profits and state agencies to control the spread of these species.  In Wisconsin, the Department of Natural Resources alone spent approximately $11 million to control invasive species in 2013 (WDNR Invasive Species Report, 2013).

Two examples of recent invasive species issues are the attempts to prevent Asian carp from becoming established in the Upper Mississippi River and the Great Lakes, and the infestation of Phragmites on the south and west shores of Green Bay. Those of us who enjoy camping know firsthand how the State Park System rules have changed in the last several years in regard to firewood and the spread of the emerald ash borer.

Phragmites patch overtaking a stormwater basin.Phragmites patch overtaking a stormwater basin.

The Wisconsin Legislature established “the Invasive Species Rule” in 2009, making it “illegal to possess, transport, transfer or introduce certain invasive species in Wisconsin without a permit” (Wis. Adm. Code ch. NR 40). A list of regulated species can be found at the WDNR’s website.  Additionally, in 2013 the Wisconsin Invasive Species Council created a statewide strategic plan for 2013-2016, highlighting objectives and goals to guide stakeholders in the process of establishing invasive species control plans.

If you are interested in helping with these efforts, please contact your local Prairie Enthusiasts chapter or The Nature Conservancy for more information.  In addition, other local organizations such as Wild Ones, Pheasants Forever and State Parks “Friends” groups provide educational opportunities and other volunteer events.  You can also contact any one of our ecologists at R.A. Smith National.

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Ecology

Fallen Trees Provide Habitat to Fish

by Patrick Shirey 5. January 2016 11:35

 

 

 

 

 

 

 

 




If you are out in the woods and discover the foundation and walls for a house without a roof, would you expect anyone to be living there?

Without a roof, someone may come to visit from time to time, but not stay long.  Think of cover in a stream akin to a roof on a house.  Things that provide cover for stream organisms such as fish include rocks, over-hanging banks, fallen trees, logs, branches and debris jams.

Logs can scour out fine sediments in the middle of the channel and trap them along the banks, exposing gravel which provides habitat for spawning.

Logs can create pools, which provide resting habitat and refuge from extreme temperatures.  In addition, fallen trees and logs also create cover and provide camouflage for fish.

Branches from trees and logs trap leaf litter flowing downstream, which serves as food for aquatic insects.  Submerged logs also provide surfaces for algae and aquatic insects to attach, such as these diatoms (golden-brown algae) and case-building caddisflies, which fish eat.

When fallen trees, broken logs and debris jams are removed from a stream to “clean it up,” we expect the stream to become more uniform in channel shape and lose these diverse habitats. The loss of debris jams created by fallen trees and branches also reduces surface area for food and cover. 

I have seen sport-fishing groups post Internet announcements and photographs of stream cleaning efforts whereby logs, branches, and debris jams are removed to promote fishing.  An example of this is shown in the before (6/19/2013) and after (9/16/2013) photographs of wood removal near the mouth of Big Brook, a tributary stream of the Wild and Scenic Namekagon River which is known for its brook trout fishery.

While log removal may reduce the chance of fishing line entanglement or provide better passage of canoes or kayaks, it also reduces available forage and cover for fish as well as resting habitat for other organisms such as turtles.  A best management practice to improve stream habitat for fisheries is to leave log and debris jams alone unless they threaten human infrastructure.  These features can also be added back to the stream landscape to improve fish habitat by conducting stream restoration projects.

Additional reading on the topic:

http://bit.ly/1S6vMI7
D.B. Booth, D.R. Montgomery, and J.P. Bethel, 1997, Large woody debris in urban streams of the Pacific Northwest: in Roesner, L.A., ed., Effects of watershed development and management on aquatic ecosystems: Engineering Foundation Conference, Proceedings, Snowbird, Utah, August 4–9, 1996, pp. 178-197.

 

http://bit.ly/1RvHrPf
Chin, A., et al. 2008. Perceptions of wood in rivers and challenges for stream restoration in the United States. Environmental Management 41(6): 893-903.

http://1.usa.gov/22NrUj8
Dolloff, C.A., and M. L. Warren Jr. 2003. Fish relationships with large wood in small streams. American Fisheries Society Symposium 37: 179-193.

http://bit.ly/1JZVYfX
Entrekin, S.A., J.L. Tank, E.J. Rosi-Marshall, T.J. Hoellein, and G.A. Lamberti. 2009. Response of secondary production by macroinvertebrates to large wood addition in three Michigan streams. Freshwater Biology 54(8): 1741-1758.

http://1.usa.gov/1MW1sIq
Hilderbrand, R.H., A.D. Lemly, C.A. Dolloff, and K.L. Harpster. 1998. Design considerations for large woody debris placement in stream enhancement projects. North American Journal of Fisheries Management 18: 161-167. 

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Ecology

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