A Northwoods Almanac for 8/29 – 9/11/25
Early Frosts No Longer Early
The first frost of autumn occurs at a much later date these days than it did in recent decades – now typically mid-to-late September. I checked some of my notes to make sure my memory was correct on this, and here’s an example of what I found:
“We had frosts on August 12 and 13 in 1990. Our last frost of ‘spring’ occurred on June 21 of that year, so we had a 52-day growing season. Consider that most of those 52 days were below average in temperature and often very cool at night. The end result was a gardener's nightmare on Manitowish Street. Our garden was mercifully laid to rest on August 12, and we were relieved to see it put out of its misery.”
We’ll see what happens this September. The day-to-day weather can always vary despite the climate changing over the long-term, so you we may yet get an earlier frost. But if was a betting man, I’d put my money on mid-to-late September.
Sightings – Merlins, Great Egret, Trumpeter Swans, A “Crèche” of Mergansers
Bob Von Holdt sent me this note and a photo on 8/16: “All six trumpeter swan cygnets that were born in Presque Isle in May have survived and thrived.” Trumpeters are indeed thriving not only in our area but throughout the Northwoods with an estimated population in 2021 that exceeded 7,000. A more recent estimate suggest around 11,000.
Judy Ruch sent me this note along with a photo of a pair of merlins: “This [merlin] pair was in our yard on July 30. The team doing a lake survey mentioned they had heard them on 7/29. So when I was on the porch at 5:20 AM, there they were. Two of this survey team are falconers so they were tuned in at the sound. Pretty exciting.” Wisconsin’s merlin population appears to be on the increase, but the birds remain a “species of concern” and are monitored by the Wisconsin Natural Heritage Inventory Program.
A great egret appeared at Powell Marsh in the third week of August, and as of this writing on 8/21, is still present. Great egrets are state-threatened. Wisconsin is on the extreme northern edge of their breeding range, so they are uncommon residents in southern Wisconsin rare in the central part of the state, and extremely rare up here. Great egrets nest in colonies ranging in size from several pairs to thousands of pairs, often in association with great blue herons, but they typically don’t forage further than 20 miles from their colony sites. The number of nesting colonies statewide has fluctuated from as few as five to as many as ten during the recent Breeding Bird Atlas work. In Breeding Bird Atlas II, great egrets were found at 15 sites in 10 counties, but with only two or three sites with over 10 breeding pairs.
| great egret photo by Bev Engstrom |
Joan Galloway sent me a photo of a female common merganser followed by a small navy of chicks. She noted, “Couldn’t believe our eyes when we saw this row of common mergansers swimming past our dock! It looked like one adult female merganser leading 20+ young mergansers!”
| common merganser creche, photo by Joan Galloway |
Female common mergansers only lay a maximum of 12 eggs at a time (an average brood is 8 to 11), so it’s safe to say that not all of the babies are the offspring of this female. So, what’s happening here? The term for this process is “post-hatch brood amalgamation,” and the combining of families can occur through a number of methods. Chicks can be adopted, they can be aggressively kidnapped, or several broods may simply combine to form what’s called a “crèche,” with one or more of the adults acting as the day care teacher(s).
The adults attending to the chicks perform only two real functions—they guard the young, and they guide them to good foraging areas and safe resting sites. Waterfowl chicks are highly “precocial,” meaning they’re born mobile and able to feed themselves. Thus, the adult parental duties for waterfowl are significantly less complicated than if their chicks were born immobile, with their eyes closed, and totally dependent on food provided by the parents, as is the case for all songbirds.
Diving ducks like mergansers employ brood amalgamation most commonly, but Canada geese do so as well.
Why brood amalgamation occurs remains unclear. Broods may be combined as a result
of competition between females for brood-rearing areas, as a means of competing more successfully for food resources, as a means of reducing predation, or because birds with poor parenting skills or who are in poor condition simply give up their young to adults more capable of parenting them.
Pelecinid Wasp
Ken Larsen sent me the following email on 8/21: “Yesterday, I was walking on my driveway at our home on Strawberry Point Drive on Fence lake, and I saw an unusual insect barely alive on the ground. My long ago college Entomology class helped me to immediately identify it as a Pelecinid wasp, which while not uncommon in this area, is not often recognized as a member of the wasp family. They are a beautiful jet black in color, are very poor flyers and look somewhat like a damselfly when in flight.
| photo by Ken Larsen |
“Most people would be afraid of the long ovipositer on the abdomen, incorrectly thinking it could sting them. However, that is not its purpose. This family of wasps are very important in the control of various beetle species, as they use this long ovipositor to reach an inch or two into the soil to deposit an egg on the back of underground beetle larvae as food for their young. As a result, they are a very important insect in the control of various destructive beetle species.”
I was unfamiliar with pelecinid wasps, so kudos to Ken for helping us to see the reason for protecting something that most of us would otherwise likely try to kill.
Great Wisconsin Birdathon Results
This year’s Great Wisconsin Birdathon saw Wisconsin birder lovers come together to raise $127,001 to protect Wisconsin’s birds. More than 620 birders made up a record-breaking 91 teams across 39 Wisconsin counties and spotted 283 bird species!
These donations support the Natural Resources Foundation of Wisconsin’s Bird Protection Fund, which supports Wisconsin’s highest-priority bird conservation projects such as long-term bird monitoring, conservation of endangered birds, and restoring historic grasslands for grassland-loving birds.
Norway! Invasive Species on Their Native Soil
Mary and I recently returned from 8 days in Norway, and whenever we visit a foreign country, I’m always curious to find their native plants that are considered invasive in our country. The list was pretty long: yellow hawkweed, birds-foot trefoil, tansy, chicory, mullein, purple loosestrife, burdock, St. John’s wort, reed canary grass, bladder campion, among others. Most interesting, of course, is that these plants aren’t problems on their native soils, purple loosestrife being the best example. I saw it along shorelines in numerous places, but only a few were mixed in here and there with the other native plants, their purple plumes quite lovely when seen in proper proportion and not as a monotype.
| purple loosestrife in proper balance in Norway, photo by John Bates |
We’ve sent a few plant species from the U.S. their way as well that became invasive – common ragweed and the pond weed Elodea canadensis are two examples.
In terms of invasive birds here, mute swans, European starlings and house sparrows were common but not overwhelming in numbers, again fitting into their native ecosystem and balanced in numbers through coevolution over millennia.
The most exciting native bird species I saw there? Three pairs of great crested grebes, all with chicks, seen relatively close from my rented sea kayak.
| great crested grebes, photo by Andrew Parkinson |
Ripening Wild Rice
Look for wild rice to be coming ripe here at the end of August. Wild rice beds ripen gradually, so beds can be riced over the course of several weeks.
If you’ve never tried ricing before, be sure to check with the DNR to see when the season is open, and to get a license. The rice falls easily when the rice is ripe. The seed heads “shatter,” meaning the seed simply falls from the plant when tapped.
Even if you have no interest in ricing, rice beds are worth watching for the number of birds and mammals they attract. Waterfowl and blackbirds feast on the rice, as do muskrats.
Archaeological evidence suggests that wild rice has been an important food for native people in the upper Midwest for over 2,500 years.
Women and Water
My wife, Mary Burns, recently spoke at the opening of her “Women and Water: Woven Portraits from around the World” exhibit at the Kenosha Public Museum. Her other exhibit, “Ancestral Women: Portraits of Elders from Wisconsin’s Twelve Tribes,” also opened the same day, making for a combined showing of 54 weavings.
I bring this up simply because her work speaks to things important to those of us who live here in the Northwoods – the conservation and protection of water, and the honoring of the stories of those who came before us. I’m certainly biased, but her work is worth seeing and the women’s stories are worth knowing.
See https://museums.kenosha.org/kenosha-public-museum/special-exhibitions for more information.
Celestial Events
For planet watching in September, look after dusk in the east for Saturn rising. Before dawn, look low in the east-northeast for Venus, and high in the east for Jupiter.
The full moon – the “Leaves Changing Color Moon” or “Harvest Moon” – occurs on 9/7. That night there will be a total lunar eclipse, but it’s not visible over North America (hop a plane to Antarctica, Australia, Asia, the western Pacific Ocean, the Indian Ocean, Europe, the eastern Atlantic Ocean, or Africa if you’d like to see it.)
We’re careening headlong toward autumn equinox. We’ll be down to less than 13 hours of sunlight as of 9/7.
Thought for the Week
“The way we see the world shapes the way we treat it. If a mountain is a deity, not a pile of ore; if a river is one of the veins of the land, not potential irrigation water; if a forest is a sacred grove, not timber; if other species are our biological kin, not resources; or if the planet is our mother, not an opportunity – then we will treat each one with greater respect. That is the challenge, to look at the world from a different perspective.” – David Suzuki