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An afternoon in the Pleistocene
Peeking around the berry bushes into the Tobey Bog’s central clearing
The oft-maligned swamp, despite holding a persistent legacy in the cultural imagination as a place of decay with little utility or aesthetic appeal to humans, has garnered several famous fans over the years. The animated ogre Shrek, famed for his protectiveness over his marshy homeland, comes to mind as a recent example, though bogs have another, arguably more eloquent devotee: Henry David Thoreau.
“Yes, though you may think me perverse, if it were proposed to me to dwell in the neighborhood of the most beautiful garden that ever human art contrived, or else of a Dismal Swamp, I should certainly decide for the swamp,” the Transcendentalist thinker wrote in his 1851 treatise to wildness, “Walking.” In that lecture, Thoreau waxed poetic about replacing his cultivated front yard with “a few square rods of impermeable and unfathomable bog,” romanticizing the rawness of the bog in comparison to the orderliness of human landscaping.
Before I embarked on an afternoon visit to the bog on a gorgeous day in early June, GMF trustee, forester, and founding member Star Childs told me that he’s always identified with that particular fantasy of Thoreau’s. In fact, he’s been lucky enough to have lived much of his life with a swamp in his figurative front yard – namely, Tobey Bog in the “North Forty” region of GMF.
Tobey Bog is no ordinary wetland, at least not in Connecticut. In his as-yet unpublished paean to the forest, the late naturalist-poet David Leff, whose lifelong love affair with the GMF landscape began with an encounter with the bog, described it as “a subarctic fragment stranded about as far south as possible,” and, “a world unto itself where the usual ecological rules did not apply.”
A glimpse of Tobey Pond from beneath the hemlocks
Paddling out
Aided by the convenience of a canoe (courtesy of the Childs family), I took advantage of some rare good weather to ferry myself across Tobey Pond for my first visit to the bog. Paddling across the pond’s dark, serene waters, fringed by drooping hemlock boughs and tall stands of white pine, the experience felt more North Country than southern New England.
Tobey Pond, like the bog with which it shares a namesake, is a specter of the ice which once weighed heavily upon these hills. When the glaciers retreated at the end of the ice age, they left behind chunks of ice lodged in the ground, which created holes known as kettles that filled with meltwater. While Tobey Pond became a lake, suitable for things like canoeing and town beaches, Tobey Bog was poorly drained and poorly fed by water sources, eventually filling with a thirty foot thick bed of sphagnum moss from which now sprouts a strange array of conifers, berry bushes, and carnivorous plants. As I would soon find out, it was, in Thoreau’s words, “the jewel which dazzled me.”
A pocket of the cold north
Parking my canoe in a shady cove of the pond, I ambled by Skinner cabin and down a gravel road to a thin boardwalk leading through a claustrophobic tunnel of highbush blueberry, huckleberry, and invasive buckthorn shrub. Eventually, the brush parted to reveal a panoramic view of the bog which Leff described as resembling “a shag carpet of the 1970s” due to the mosaic of “heathered green and reddish highlights.” I agreed with Leff that the amphitheater-like space conjures the feeling of being within a “huge oculus in a massive rotunda.”
Ecologically, it recalls imagery of the boreal peat bogs of high latitude North America and Europe. Scrubby conifers perch upon a squishy bed of sphagnum moss that compresses at depth to form peat, a thick mat of organic material that is used as a fuel source in many parts of the world, or as in Scotland, to flavor liquor. Trees like red maple, larch, and white pine dominate a patchy overstory, while scrubby black spruce mingle with the berry bushes in the shrub layer, reminiscent of the landscapes of northern Maine or Atlantic Canada.
“It’s a little mini-ecosystem all of its own that attracts these northern species,” Star said.
One of the only deciduous conifers native to the US, the eastern larch, also known as the tamarack, thrives in boggy soils
These trees and shrubs can survive in the nutrient-poor, acidic soils that the bog provides, as can a much stranger, smaller, and hungrier flora: carnivorous sundews and pitcher plants. While the tiny sundews eluded my layman’s eye, the purple pitcher plant – the only species of its kind that tolerates cold weather – was obvious, with deep green and magenta leaf furls curling into the eponymous pitchers that trap prey to provide the valuable nitrogen the bog itself cannot provide. In little hollows beneath the shrub branches, the fleshy, bulbous blossoms of the plant, just opening at the time of my visit, stood from the moss like troupes of elves in dappled, emerald sunlight.
While this bog took thousands of years to form, it feels like a vestige of the Pleistocene era, when the land had just shaken itself free of its icy burden. The effect is amplified by the drone of frogs echoing through the larches and the thrum of dragonfly wings beating past my ears. It’s easy to grow fanciful here. Michael Gaige and Yonatan Glogower’s 2016 field guide to the forest recommends that readers should “go [to the bog] when you need to find some peace in your life, albeit of the soggy, acidic variety.”
The bulbous blossoms of the purple pitcher plant looking very Dr. Seuss among the moss and sedge
Timeless – but vulnerable
Tobey is “a true quaking bog,” said Star before I embarked. And quake it does. While the two-plank boardwalk feels solid enough underfoot, a subtle bounce under each step suggests the true nature of the gelatinous substrate beneath.
This shake, just a hint of unsteadiness, reflects the fragility of the ecosystem itself, no matter how ancient and timeless it may feel to a human visitor in this strange blip in geologic time. The existence of a peat bog is defined by the input of water outpacing its loss through evaporation and plant respiration, which makes them particularly susceptible to changes in temperature and precipitation.
Bogs further north, known as ombrotrophic bogs, receive the entirety of their water from precipitation, and are reliant on cool temperatures to keep from drying up, which is why they don’t occur as far south as Connecticut. As abnormally warm summers increase in frequency, disproportionately impacting arctic and boreal regions, these bogs are at risk. A 2020 study conducted in the Black Forest region of Germany (which somewhat resembles the rugged but low hills of Northwest Connecticut) found that biodiversity in temperate bogs has already been impacted by climate change, and remains threatened due to rising temperatures and decreased precipitation. The study maintains that there are few management options available to combat these trends.
When these bogs dry up, they can also burn. There has been ample research conducted in recent years on the environmental impacts of smoldering wildfires on peatlands, which can quietly burn in the soil for years, overwintering deep in the peat layer. Peat bogs contain a large percentage of the world’s terrestrial carbon stores, similar to the amount held in the atmosphere, and fires can release massive amounts of the gas. A 2021 study on northern peat fires reported that arctic wildfires are on the rise, and have been contributing significantly to greenhouse gas emissions. If warming temperatures continue unmitigated, the study predicts that annual carbon loss from peat souls could total almost 550 megatons per year.
As this carbon is released, it contributes to global warming which is already disproportionately affecting northerly regions. This warming in turn melts more permafrost and dries out the soil, thus allowing more fires to ignite, which as a result puts even more carbon into the atmosphere. It’s what climatologists call a positive feedback loop.
Tobey Bog is minerotrophic, meaning it receives supplemental water through ground seepage. Due to its limited size it is not a great carbon store itself, and its moisture content is supported by the additional groundwater it receives. It too, however, is at risk from rising temperatures and changes in precipitation patterns, as decomposition rates can increase “dramatically” with warmer weather, penetrating the deep peat layers of preserved organic material, according to Gaige and Glogower. Its reliance on peripheral water sources also puts it downstream of any impacts to those resources.
A window to the north
Connected futures
Former GMF director Hans Carlson ran a column in the “Norfolk Now” contemplating the natural and cultural history of the region’s landscape in the late 2010s, including an article on Tobey Bog, a place which he said has largely remained on the outskirts of Western interest. Now, though, the bog is no longer able to sustain an existence separate from the human behavior, even as it gains value in the eyes of conservationists and nature-lovers. Carlson’s words on the subject, written nine years ago, are more potent now than ever: “We will continue to leave Tobey Bog to its own processes and life cycles, preserving it as a rarity in Southern New England, but it is no longer a place on the margins of our choices.”
Many of our leaders and decision-makers could benefit from a trip to the bog. It captivates and enchants, and thus, perhaps may encourage the right choices. Gaige and Glogower reference a 1991 master’s thesis by Erica Hamlin in which she told the story of Tobey Bog’s ecology through creative scientific prose and charcoal drawings. “It is a good reminder that strange ecosystems like bogs have the power to inspire people across disciplines and cognitive frames,” they write.
Or, as Thoreau said: “Hope and the future for me are not in the lawns and cultivated fields, not in towns and cities, but in the impervious and quaking swamps.”
Healthy forests, healthy people – and healthy ticks?
The hills are alive in Northwest Connecticut, but it’s not all birdsong and snowdrops: the blacklegged tick has shaken off its winter torpor, and now crawls in droves through the understory, spreading disease and myths in equal measure.
Dr. Scott Williams, Chief Scientist and Head of the Department of Environmental Science and Forestry at the Connecticut Agricultural Experiment Station (CAES), a state organization spearheading research on tick-borne diseases, dismissed two commonly held misconceptions about the tiny, dangerous insect: “They don’t fly. They don’t drop out of trees.” Williams advised that rather than worry about the branches overhead, think low and keep your ankles covered. “They crawl up from the ground for the most part, or [from] a few inches off the ground.”
Demystifying tick behavior and pathogen transmission yields surprising insights into how to manage disease levels in our region: in a healthy forest, more ticks might actually equal less disease, Williams explained.
Debunking Myths
Blacklegged ticks (also widely known as deer ticks) and Lyme disease are commonly misunderstood components of the New England forest, starting with the illness’ origin story. Conspiracy theories abound speculating where it began, with an especially persistent and oft-debunked claim that it leaked from a government research facility on Plumb Island.
But reputable research has shown that the disease has been circulating in the northern hemisphere for millennia. One of the bacterium responsible for causing Lyme disease, Borrelia burgdorferi, was detected in Ötzi the Iceman, a 5,000 year-old mummy found in the Eastern Alps in the 1990s. A study conducted by the Yale School of Public Health in 2017 traced B. burgdorferi back to North American forests of 60,000 years ago, meaning the bacterium was resident in our woods long before the earliest human inhabitants arrived.
Closer to home
Deer ticks and Lyme disease are as Connecticut as New Haven pizza, with one of our picturesque coastal towns lending its name to the ailment after a cluster of cases there in the 1970s lead to its identification as a unique condition. The state remains positioned in the very heart of tick country, and the Icebox of Connecticut, which previously benefitted from the protection of its harsh winters, is losing its defenses as the cold season continues to warm up.
“We’re not trying to scare people from being outside, we’re trying to educate people on when the various stages [of ticks] are active – what’s tick habitat and what’s not,” Williams said. For instance, a field of high grass, commonly regarded as a tick haven, is actually largely inhospitable to the bugs, as they desiccate quickly in a dry environment. “That’s kind of a desert for ticks,” Williams explained.
The most “ticky” habitat “is really that edge where your lawn meets the forest,” he said, and when it comes to getting bitten, it’s often a matter of timing.
When to watch out
While adult deer ticks are active now, Williams explained that May, June, and early July are the months when most infections occur since that’s when both humans and the nymphal stage of deer ticks are likely to be active outdoors. Although the adult ticks wandering the undergrowth and brush now can certainly transmit the pathogen, it’s the nymphs that are “the really problematic guys,” Williams said, in part because they are small and hard to detect, and also because in spring, “human activity and tick activity in the nymphal stages coincide.”
A white-tailed deer in the forest. Photo: Mike Zarfos
Host competency and the dilution hypothesis
Active ticks, active humans, and an abundance of both yield higher bite rates, thus contributing to more infections. However, Williams explained that the species present in an ecosystem can have significant impacts on the spread of tick-borne pathogens to humans.
A surplus of white-tailed deer upon the landscape, for example, is often thought to correlate to more tick-borne illness. While a large deer population will often support a high concentration of ticks, deer are a “dead-end host” for the bacterium, meaning they don’t transfer the pathogen back into the ticks.
Mice, however, are “competent hosts.” The concept of host competency is the ability of a reservoir host species (animals that carry and spread disease-causing pathogens) to infect the ticks with pathogens, which small rodents are highly adept at whereas larger animals are less so. When deer are plentiful on a landscape, “you typically have high tick abundances with lower infections with the various pathogens,” Williams said.
The reservoir host species of B. burgdorferi that actually infects the ticks with the pathogen are small rodents, especially the white-footed mouse which is common to the Litchfield Hills. When fewer deer, and other medium sized mammals, are available, Williams explained that the ticks will then be forced to feed primarily on mice, which will support a smaller population of ticks within which the pathogen is much more concentrated.
CAES team conducts Lyme disease research with mice in Woodbury. Photo: Mike Zarfos
Healthy forests, healthy people
In a healthy ecosystem with a spectrum of animal species, ticks aren’t forced to rely on these highly competent hosts for a blood meal. Williams explained that this scenario, in a species-diverse forest, describes what disease ecologists call the dilution hypothesis: “with a diversity of animals, you’re going to see less infection in the ticks because they have so many options to feed.”
The loss of forest diversity can have the opposite effect, Williams said, which is happening across the Northeast due to development and the incursion of invasive species. Several years ago, Williams conducted research on the correlation of Japanese barberry, an invasive shrub, with tick populations; some of the work was done at Great Mountain Forest with the help of GMF forester Jody Bronson. The study found that the dense tangle of undergrowth created by the proliferation of the shrub caused a humid microclimate that not only provided great tick habitat, but enabled them to remain active throughout the day.
Normally, the moisture-dependent ticks might be inactive under a pile of leaves during the heat of the day, Williams said. But the microclimate created by the “monoculture” of invasive brush growth means ticks continue looking for a host “pretty much 24 hours a day.” He clarified that this was not specific to Japanese barberry, but any plant that grows in a monoculture tangle, “which is pretty much what invasives do in our neck of the woods.”
“What we’re trying to push is a healthy, diverse forest, and that’s very applicable to Great Mountain Forest,” Williams said. The goal, he continued, is responsible management: “If you have a healthy, diverse, well-managed forest, you’re going to have a diverse array of wildlife, and as a result you’re going to have a healthier tick population with lower pathogen infection. That’s kind of the bottom line.”
