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Controlling an Invasive Thug

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By Bengt Miller SFEG Stewardship Coordinator

 

If you are familiar with the term Polygonum then you deserve a pat on the back and a gold star. Polygonum is the name for a group of plants known collectively as the buckwheats. Within this family there is also a genus called Polygonum. These plant species are known collectively as knotweeds. The various species: Japanese Knotweed, Giant Knotweed, Bohemian Knotweed (a hybrid between Japanese and Giant) and Himalayan Knotweed are all listed as noxious weeds in Skagit County. All are required for control, except Bohemian Knotweed.

 

The Washington State Department of Agriculture has recognized the negative impacts knotweed has on riparian areas and has set aside funds specifically for the control of this invasive species. Knotweed poses the biggest threat to riparian areas. These stream corridors provide the perfect habitat for knotweed: the constant moisture provides a great growing medium, regardless of the soil type. In addition, knotweed propagates by fragmentation, meaning parts that are broken off the parent plant readily sprout into new plants.  Streams provide an ideal mode of transport, and thus one plant that is fragmented by beaver or weedwhacking can form a whole new colony. Once established knotweed forms a dense monotypic stand, reaching up to 13 feet tall, that outcompetes native understory vegetation. This is exceptionally troublesome because studies have shown that streams with large knotweed infestations have up to 40% fewer macroinvertebrates, due to the lower nutrient levels of knotweed leaves versus native species. These macroinvertebrates are the primary food source for juvenile salmon. Hence there is an inverse relationship between knotweed density and the number of juvenile salmon in a stream.

 

SFEG has been working since 2010 to control knotweed in the Skagit Watershed. The Upper Skagit Knotweed Control Program has the mandate to control knotweed anywhere in the Skagit Watershed upstream of Rockport. We survey for and treat knotweed on public and private land. Because SFEG is not a state agency we do not have any regulatory authority and depend on the willingness of private landowners to participate in the program. We are able to treat knotweed at no cost to the landowner because of grants from the United States Fish and Wildlife Service, National Fish and Wildlife Foundation, Mount-Baker Snoqualmie National Forest and Washington Department of Agriculture. Their support of the program has been vital.

 

Since the project began, the effort has identified over 2,000 patches of knotweed and has achieved 81% control in the floodplain and 70% control of knotweed in the entire Upper Skagit Watershed. In 2017, SFEG and the Washington Conservation Corps (WCC) surveyed within the 100-year floodplain along 34.5 mainstem river miles of the Skagit and Sauk Rivers, plus 5.2 miles of various tributaries, traversing approximately 3,269 acres (5.1 mi²) in which 3,087 individual knotweed stems in 137 patches were treated. The average size of each patch treated was 215 square feet. The average of less than one stem per acres is unheard of in infested watersheds.

 

This program is recognized throughout the state as a success. You can paddle, hike or drive along the banks of the Skagit or Sauk Rivers upstream of Rockport and with the exception of a few spots you will not see knotweed without a map showing where it is located. This is a stark contrast to the lower portions of the Skagit River, where knotweed continues to proliferate, sometimes being the only established vegetation on riverside gravel bars, and is a tribute to the quick and continued action taken by organizations in the Skagit Coordinated Weed Management Area.

 

If you would like to learn more about knotweed or are a Skagit landowner with property upstream of Rockport and would like a free knotweed survey conducted on your property contact Bengt Miller with the Skagit Fisheries Enhancement Group at bmiller@skagitfisheries.org.

 

Foraging tip: young, tender knotweed shoots can be collected and cooked similar to asparagus. Apparently they taste similar to rhubarb.

The Diary of an Intern, Big Kid, and Future College Graduate

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By: Jackie Wenala, Education Intern 

I never really knew what I wanted to do when I grew up. And now I’m still just a curious kid, who makes flower crowns whenever they see daisies, who makes terrible puns, and who asks “why?” all the time. I’m definitely that kid that asks, “What kind of tree is that?”, and, “what is a slough, exactly?” I mean that literally. I really asked those to the other interns and staff last week. I’m also a university student, so I get to learn all the time. My favorite classes are the ones with field trips though, cause I get to go outside and collect data in a lake or a stream or a forest, all probably while getting rained on or swarmed by bugs. Definitely the best way to spend a Wednesday afternoon. Honestly what makes it worth it are those moments where I go, “oh, so that’s why.”

Most of what I do as the new education intern is help with visits to classrooms to teach kids about salmon and restoration, as well as go on field trips, which (like the kids) is my favorite part. I have gone to creeks to release little baby salmon, pulled ivy, and led games with kids. Though I get to tell kids what I know about salmon and what they need in the environment, I also get to hear other people talk about our environment. So far I learned how to identify twinberry and alder trees, and when out on a field trip, I asked what kind of tree I was looking at, which is how I learned that my new favorite tree is quaking aspen. When I visit elementary schools, the students surprise me with their interest in salmon and their interest in what I do. One student asked about how and why I got to be there, standing in front of them, answering their questions. That was the toughest question I’ve ever gotten from an elementary student. I mean, where do I start? Their curiosity and intelligence was truly inspiring, and now I feel like  answering their questions was the reason why I was there.

When people ask me, “What are you doing after you graduate?” it’s hard to answer. Of course what they really want to know is what job or career I’m pursuing, but I just want to keep learning about nature. But you know, without all the tests and paying thousands of dollars. I never really knew what I wanted to do when I grew up. Not that I really know now. But learning something new every day feels like it’s getting me a little closer. And now as an intern, I can spend time trying to learn a few new things, and maybe even passing on what I’ve learned, so that others can be just as curious about the world as me. And that will surely take me somewhere closer to answering the question of what I’m going to if I ever grow up.

Did you plant this habitat?

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Picture 1. The first glimpse of the mystery bird.

It’s always wonderful to be able to spend a day in the field, regardless of the weather. The excitement is heightened when something infrequently seen is spotted. That happened on February 14 to a small contingent of Skagit Fisheries staff. While halfway through a stewardship visit to a property owned by Seattle City Light, SFEG staff encountered an unusual avian shape in a tree about 20 feet above the ground. It was roughly the size of a robin, but of a different silhouette, see picture 1. Closer inspection revealed that it was in fact a pygmy owl, picture 2. A little research back in the office revealed that this tiny owl species preys on small song birds, rodents and large insects, and nests in cavities of trees. For some reason this particular species will not use human constructed nest boxes, another reason to preserve natural places, especially with dead tree snags.

 

Picture 2. Another look at this bird shows it is a pygmy owl, and good at camouflage! 

This particular property has been the site of multiple restoration projects, dating back to the mid 2000’s. What made this observation extra special was that this particular Douglas fir that the owl was roosting in was most likely planted by a SFEG volunteer on a cold, wet morning in February, much like when it was observed.

 

By Stewardship Coordinator Bengt Miller, photos by himself and Restoration Technician Lindsey Juen.