Tag: invasive species

Garlic Mustard song

The invasive species problem remains one of the top threats to Earth’s life-sustaining systems. Yes, global climate change is scary, especially now that it looks like we’re now on track for a 2.5 degree increase. Sigh. But it’s also scary to watch familiar landscapes rapidly lose their biodiversity as they are overrun by invasives — native trees literally being pulled down by Oriental Bittersweet, native songbirds being driven out their nesting sites by invasive House Sparrows, native plants being killed off by the chemicals released into the soil by invasive Garlic Mustard…. Anyway, I decided to write a song about what we can do to Garlic Mustard.

Image of sheet music

(Yes I claim copyright, but I hereby grant you permission to sing it, reproduce it, record it, etc.)

Recipe for Garlic Mustard Pesto.

Natural dyes from invasives

I’ve been researching natural dyes for textiles, and got interested in the possibility of using invasive species to make dyes. After all, if you’re going to pull up the plants anyway, why not do something with them? Here’s a list of invasive plants in Massachusetts, and also a list of plants likely to be invasive.

I’m still in the research phase, and haven’t actually tried any of these myself. Many of these appear to be recipes for dyeing wool yarn. Nevertheless, here are some possibilities I found:

Other non-native species that can be used for dyeing:

Unfortunately, much of the material I found online is not entirely useful. Some of the webpages linked to above just say that the plant can be used as a dye, but with no indication of mordants, length of time in dye bath, color-fastness, etc. And many of those dyeing are only interested in dyeing wool yarns, while I’m more interested in tie-dye projects for kids (here’s info on mordants for cellulose, e.g. cotton, fibers). Anyway, I’m planning to do some invasive species dyeing myself, and if I do I’ll give some more details.

Killer

Beech leaf disease (BLD) has arrived in Cohasset. I’m seeing leaves on American Beeches withering and dropping off both in Wheelwright Park and in the Whitney Thayer Woods. In some places, stands of beeches have lost so many leaves that it no longer feels like you’re walking in the forest.

Withered leaves on an American Beech sapling.
American Beech sapling in Whitney Thayer woods with BLD

A scientific article from two and a half years ago — Sharon E. Reed, et al., “The distribution of beech leaf disease…,” Forest Ecology and Management, vol. 503, January, 2022 — found that BLD is a worse threat to American Beech stands than two previous invasive pathologies, beech scale (Cryptococcus fagisuga), and beech bark disease (C. fagisuga and Neonectria spp. complex).

Withered leaves on an American Beech sapling
American Beech sapling in Whitney Thayer Woods with BLD

An invasive nematode from east Asia, Litylenchus crenatae, is always present when BLD is present. But a scientific article from Sept., 2021 — Carrie J. Ewing et al., The Foliar Microbiome Suggests that Fungal and Bacterial Agents May be Involved in the Beech Leaf Disease Pathosystem, Phytobiomes Journal, pub. online 29 Sep 2021 — also found that organisms from four bacterial genera — Wolbachia, Erwinia, Paenibacillus, and Pseudomonas — and one fungal genus, Paraphaeosphaeria — are always present with the nematode when BLD is present.

A few withred leaves among healthy leaves in an American Beech sapling
American Beech sapling in Whitney Thayer Woods with BLD

From what I can gather, our understanding of BLD is still incomplete. However, a few things are quite clear. The University of Rhode Island suggests a couple of strategies to try to save trees from BLD: heavy applications of phosphite fetilizer twice a year, and/or application of pesticide to kill the nematodes. If trees with BLD are left untreated, they will die within 6 to 10 years. Since we cannot treat most trees in our forests, we can expect most infected American Beeches to die within a decade.

Yet another reason for eco-grief.

And this is another reminder that as dire as the situation might be with climate change, invasive species are also devastating our New England forest ecosystems. A hundred years ago, we lost our American Chestnuts to invasive Chestnut Blight. Fifty years ago, we lost most of our American Elms to invasive Dutch Elm Disease. We’re in the process of losing all our Eastern Hemlocks to an invasive insect, the Woolly Adelgid, and all our ash trees to another invasive insect, the Emerald Ash Borer. Now we’re losing all our American Beech trees to yet another invasive organism.

Yes we need to stop climate change, but that’s only a part of the threat to Earth’s life-supporting systems. There’s a lot of work for us to do….

“Rethinking Weeds”

The spring/summer issue of the Harvard Divinity School Bulletin features a number of essays on ecological spiritualities. I turned first to the essay by Vanessa Chakour titled “Rethinking Weeds.” As someone deeply interested in urban and suburban ecology, I was curious to see how someone might reassess the presence of weeds.

Unfortunately, the article starts off badly. In the very first paragraph, Chakour writes:

“With the combined increases of deforestation for agricultural purposes, suburban sprawl, and mass consumption of unsustainable food sources, the presence of invasive species and so-called weeds simultaneously increases. However, negative perceptions of these plants and the ‘war on invasive species’ contribute to greater ecological damage and exacerbate an adversarial relationship with the living earth by ignoring the needs of a diverse, functioning, and abundant ecosystem.”

Well… no.

Chakour claims that the “war on invasive species” (not a phrase I’ve heard widely used by field biologists and land managers) somehow contributes to “greater ecological damage.” In my experience, this simply isn’t true. As an example, consider the invasive species Yellow Star-thistle (Centaurea solstitialis). In Edgewood Natural Preserve, San Mateo County, California, Yellow Star-thistle began to dominate several grassland areas in the preserve, crowding out endangered endemic species. Biologists and land managers developed a control protocol that involves mowing at specified times of the year, then hand-pulling remaining plants to keep them from re-seeding. The end result has been to greatly reduce the numbers of Yellow Star-thistle and to help repair a highly damaged ecosystem, leading to a rebound not just in endangered native plant species but also native insect pollinator species. If Chakour considers this to be part of the “war on invasive species,” then far from contributing to “greater ecological damage” it has led to repair and regeneration of a unique grassland ecosystem. I know some of the people who have worked for years to control invasive Yellow Star-thistle at Edgewood Preserve, and for Chakour to claim that these people “contribute to greater ecological damage and exacerbate an adversarial relationship with the living earth by ignoring the needs of a diverse, functioning, and abundant ecosystem” is both ignorant and insensitive.

Part of the problem is that Chakour does not adequately define what she means by “invasive species,” “introduced species,” or “weed.” Ecological scientists might define an invasive species as an introduced (non-native) species that seriously upsets the balance of an existing ecosystem, i.e., that is ecologically destructive on a wide scale. Chakour and I both live in Massachusetts. In our state, we have about 2,200 plant species, of which about 725 are introduced species; of the latter, just “72 … have been scientifically categorized by the Massachusetts Invasive Plant Advisory Group (MIPAG) as ‘Invasive,’ ‘Likely Invasive,’ or ‘Potentially Invasive’,” according to Mass Audubon; only 36 species, or 5% of introduced species, are actually invasive in Massachusetts. Of the ten taxa of plant Chakour discusses in her essay, only one species is invasive here. The other 9 taxa she discusses include both native and introduced species that may or may not be classed as weeds, depending on who you talk to.

Chakour would have done better to discuss what we mean by “weeds.” We could define “weed” quite simply as a plant that a human being does not want growing where it happens to grow. To the homeowner who has been sold on the idea of a perfect green lawn, Dandelions (Taraxacum officianale) are weeds (T. officianale is not considered an invasive species here in Massachusetts). And yes, there are homeowners, golf course groundskeepers, and city parks departments who use toxic chemicals to get rid of weeds like Dandelions. Once you realize Chakour is actually writing about weeds, not invasive species — and if you remember that she’s writing about ecological spirituality, not science — then her essay makes sense.

Considered in that light, Chakour’s essay boils down to two main ideas. First, the word “weed” represents one human’s judgement, and thus may not be an accurate evaluation of a plant’s value to the wider ecosystem. Second, Chakour makes the interesting point that plants can be resources for physical and spiritual healing. Here she’s speaking as an herbalist, with what appears to be a deep knowledge of herbalism. Herbalism may be considered as a kind of ecological spiritual practice that heals both the body and the soul. So Chakour is arguing that if more people could know the health physical and spiritual benefits of some of the plants perceived as “weeds,” humans would be less likely to use toxic chemicals to get rid of those “weeds.”

It’s worth reading “Rethinking Weeds” to learn about one talented herbalist’s ecological spirituality. However, given the errors it contains, this essay should not be cited in any pragmatic discussion of land management or invasive species. This is unfortunate, because I believe ecological spiritualities could provide pragmatic help for addressing some of the big threats to Earth’s life supporting systems — but in order to do so, ecological spiritualities need to pay attention to the work of the ecologists, field biologists, climatologists, and other scientists, along with the land managers and other people who are actually out in the field working hard trying to save our planet before it’s too late.

Saco, Me., to Westport, Mass.

We stayed up late last night singing around the camp fire. Glenn mostly led the singing, with help from Amy, and drumming by Richard. Jon and I helped out where we could with uke and guitar. At Jean-Pierre’s urging, Milene sang us a traditional French Canadian song. Chantelle and some others went to bed at ten, but we kept going until quiet hour. It was after eleven when we got to sleep.

We had a leisurely morning. We packed up our campsite and loaded up the car. I enjoy packing up campsites and loading cars, so this proved to be a pleasurable morning for me. Then we ate an early lunch at a picnic table. Richard happened to be there, and we had a long talk, covering everything from Gilles Deleuze and the relationship between colonialism and religion on the one hand, to updating each other on the details of our personal lives on the other hand.

After lunch, I went out into the woods behind Ferry Beach Park Association, while Carol-the-extrovert went off to talk with people. I took a number of photographs of plants and other organisms which I uploaded to iNaturalist. I was sad to see that nearly all the Eastern Hemlocks (Tsuga heterophylla) were infested with Hemlock Woolly Aldegids (Adelges tsugae), an invasive insect from Asia. Many hemlocks were badly infested, and I also saw several dead hemlocks. I have also noticed that there were almost no Black-throated Green Warblers nesting in the woods this year, in contrast to past years when they were numerous. I wonder if the Black-throated Green Warbler prefers hemlocks for nesting, so that the loss of the hemlocks may mean the loss of the warblers.

On a more pleasant note, I came across a Glossy Ibis in the pond just to the north of Ferry Beach Park Association. I’ve never seen a Glossy Ibis there.

We began driving south at a quarter to four. I asked Carol if she’d mind driving because I didn’t think I was alert enough to drive. It was a good thing she drove, because I slept for most of the three hour drive.

We arrived at our summer rental at a quarter to seven. We got dinner at Lee’s Market in Westport. We met one of our neighbors, a skunk who appears to be living under the house. We feel quite settled in, and now we’re ready for bed.

Saco, Me., to Bath, Me.

This afternoon, Carol and I drove up to Bath, Maine, to sing Sacred Harp on the gazebo in the center of Bath. It turned out to be an excellent place to sing, which may show that a good singing space does not need walls if you have a wood ceiling and a wood floor. And with no walls, we were much less worried about transmitting COVID, especially with the stiff breeze that was blowing. It also turned out to be an excellent group of people to sing with. As Carol said after the singing, “It was a really tight group.”

After the Sacred Harp singing was over, we got takeout food. We ate dinner in a city park overlooking the Kennebec River. This is the furthest east we will travel on our cross-country trip.

Carol looking east over the Kennebec River

A quick meomry from our cross-country trip that I forgot to write down earlier:

When we drove into Wyoming, a sign directed all vehicles with watercraft to pull into the Port of Entry for inspection — “including canoes and kayaks.” Signs directed us around the weigh station to a small building belonging to the Wyoming Fish and Game Department. A polite young woman carrying a clipboard and wearing a Fish and Game uniform greeted us. She was obviously checking for invasive species. She looked at the canoe on top of our car, and at our California license plates. “What was the last body of water you had the canoe it?” she asked.

I thought for a moment. We hadn’t used the canoe in the whole 13 years we’d lived in California. “The Atlantic Ocean,” I said.

She looked surprised. “Whereabouts?” she asked.

“Coast of Maine,” I said. “Saco Bay.”

She knew Saco Bay, and it turned out that she, like me, was from Massachusetts.

“Where’d you grow up?” I asked.

“Near Essex,” she said, and told me which town.

There was no one behind me waiting to have their boat checked, so we chatted for a bit. We asked what brought her out to Wyoming. She had gotten her degree in wildlife management at a university in New York state, worked for a while in the northeast, then decided she wanted to go some place completely different. So she chose Wyoming.

I told her I was glad that Wyoming was checking all watercraft for invasive species. “I’m a fisherman, and invasives have already ruined too many fisheries,” I said.

“Especially the mussels,” she replied.

So yeah. If you own a boat, remember: clean, dry, and drain.

Acton, Mass., to Saco, Me.

Abby and Jim’s back yard proved to be a very comfortable place to sleep. As we were packing up the car to leave, I noticed these charismatic European Paper Wasps (Polistes dominula) building a nest.

Native to Mediterranean Europe, P. dominula was first introduced to the United States in Massachusetts in the 1970s. Since then, it has spread to Maine, Pennsylvania, Michigan, South Dakota, Nebraska, Arkansas, Washington state, and perhaps elsewhere. Abby said she was going to kill the insects and remove the nest, which I am glad of — according to the Invasive Species Compendium website, P. dominula has been shown to displace native Polistes species.

Another dreary drive today, though only two hours long. Traffic was heavy and aggressive from Acton to southern Maine. We were glad to get off the highway, and set up our tent at Ferry Beach Conference Center, where I’ll be leading a workshop in ecological spirituality for the next week. I’ll post more about that workshop in the coming days.

Sawyer Creek, Oshkosh, Wis.

Dad-in-law and Nancy live near Sawyer Creek near where it drains into the Fox River. So that’s a natural destination when we go out for walks. I went out walking around Sawyer Creek this morning, starting along the north side near Eagle Street, crossing the creek at North Westfield, then following along the south bank through Red Arrow Park. Quite a few plants were in bloom, including attractive but invasive flowers Foxglove Beardtongue (Penstemon digitalis) and Creeping Bellflower (Campanula rapunculoides). Purple Crownvetch (Securigera varia), another invasive species, were everywhere, with their feathery leaves and clover-like pink-and-white blossoms. I was interested to see flowers of the invasive species Flowering Rush (Butomus umbellatus), a plant I’d never seen in bloom before. Actually, most of the flowers I saw were invasive species.

Invasive species Purple Crownvetch (Securigera varia) in full bloom

I did see one or two native species blooming. There were some elderberry (Sambucus sp.) in bloom, which were probably native. And some of the small scrubby willows (Salix sp., prob. Salix interior, or Sandbar Willow) growing along the south bank of the creek still had some catkins in bloom.

Sandbar Willow (Salix interior) with catkin

In the early evening, I went fishing along this stretch of Sawyer Creek. I couldn’t see any evidence that the water was flowing. The turbidity was high, and in some places the acquatic plants were pretty thick. I found a place with few plants, and at my first cast a small Yellow Perch (Perca flavescens), a native species, chased the lure right up to the bank. It was so small that it couldn’t actually get its mouth around the lure. I could see I wasn’t going to catch anything, and that was fine with me. I spent a happy half hour trying to read the stream, casting, and changing lures every once in a while. For me, fishing is better than mindfulness meditation: it clears my mind, and I have no concerns about whether I’m engaging in Whitened Buddhism.

My iNaturalist observations for June 29.

Not only climate change

The BBC reports that toxic chemicals in the environment are just as big a threat as climate change:

“Chemical pollution has officially crossed “a planetary boundary”, threatening the Earth’s systems just as climate change and habitat loss are known to do. A recent study by scientists from Sweden, the UK, Canada, Denmark and Switzerland highlights the urgent need to turn off the tap at source. Many toxic chemicals, known as persistent organic pollutants, or POPs, don’t easily degrade. They can linger in the environment and inside us – mostly in our blood and fatty tissues – for many years.”

A couple of years ago, I heard a talk by Dr. Stuart Weiss, a field biologist in the San Francisco Bay Area. He identified five major threats to the life-supporting systems of planet Earth:

1. Global climate change
2. Land use change (including deforestation and habitat destruction)
3. Invasive organisms
4. Toxication (including solids, like plastics, as well as chemicals)
5. Overpopulation

I would add one more — nuclear war — for a total of six major threats to earth’s life-supporting systems.

Upper middle class Americans have focused on climate change as the major environmental threat. But even if we solve the climate change problem, any combination of the other five threats would also lead to a “great extinction.” This is why having everyone buy an electric car is not going to fix looming environmental disaster. My guess is that major systemic change is needed, probably involving replacing capitalism with an economic system that is not a-moral (or immoral).

The biggest environmental threat in California?

Here’s another environmental threat to keep you up at night:

“Nitrogen deposition and pollution is [a] more acute threat than climate change. … [But] few people are paying attention.” — Dr. Stuart Weiss, Chief Scientist of Creekside Science.

Weiss’s key paper on Bay Area nitrogen deposition, written while he was at Stanford, has a great title: Cars, Cows, and Checkerspot Butterflies: Nitrogen Deposition and Management of Nutrient-Poor Grasslands for a Threatened Species (Conservation Biology, v. 13 no. 6, Dec. 1999, pp. 1476–1486).

I’m listening to Weiss talk to the California Naturalist class I’m taking right now. Weiss makes some interesting points: Smog does an amazing amount of damage, not only to human lungs but also to non-human organisms. Non-native grasses are big contributors to the increase in pollen in recent times. Free-range cattle on California grasslands can keep non-native invasive grass species under control, providing habitat for endangered species as well as reducing allergens.