It is early spring and I’m walking through one of my favourite woodlands in Ontario’s Carolinian forests. The river that had swollen with snow melt just a week before, now flows with more restraint. I can see the cobbles and clay of scoured banks under the water. Further on, part of the path along the river has collapsed from a major bank scour the previous week. The little river is rather big and capricious, I ponder; then I consider that the entire forest sways to similar vagaries of wind, season, precipitation and unforeseen events. Despite its steadfast appearance, the forest flows—like the river—in a constant state of flux and change, cycling irrevocably through life and death.
The forest is littered with snags and fallen trees in different stages of breakdown, decomposition and decay. I spot several large cedar, pine, oak and maple snags with woodpecker holes. The snags may remain for many decades before finally falling to the ground.
I walk slowly, eyes cast to the forest floor thick with dead leaves, and discover seeds and nuts—the promise of new life. I aim my gaze past trees and shrubs to the nearby snags and fallen logs. I’m looking for hidden gifts. One fallen cedar log reveals swirling impressionistic patterns of wood grain, dusted with moss and lichen. Nature’s death clothed in beauty.
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A fallen maple snag decomposes with the help of several organisms, Little Rouge Woodland, ON (photo by Nina Munteanu)
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The bark of a large pine tree that has fallen is riddled with tiny beetle holes drilled into its bark. Where the bark has sloughed off, a gallery of larval tracks in the sapwood create a map of meandering texture and colour.
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Decomposing pine log displays a gallery of larval tracks, Little Rouge Woodland, ON (photo by Nina Munteanu)
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Fallen Heroes & Saprophyte Characters
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The forest ecosystem supports a diverse community of organisms in various stages of life and death and decay. Trees lie at the heart of this ecosystem, supporting a complex and dynamic cycle of evolving life. Even in death, the trees continue to support thriving detrivore and saprophytic communities that, in turn, provide nutrients and soil for the next generation of living trees. It’s a partnership.
Decomposition and decay are the yin to the yang of growth, writes Trees for Life; together, they form two halves of the whole that is the closed loop cycle of natural ecosystems.
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Snags and rotting logs on the forest floor provide damp shelter and food for many plants and animals. Most are decomposers, including earthworms, fungi, and bacteria. As the wood decays, nutrients in the log break down and recycle in the forest ecosystem. Insects, mosses, lichens, and ferns recycle the nutrients and put them back into the soil for other forest plants to use. Dead wood is an important reservoir of organic matter in forests and a source of soil formation. Decaying and dead wood host diverse communities of bacteria and fungi.
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Mother Archetypes
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Wood tissues of tree stems include the outer bark, cork cambium, inner bark (phloem), vascular cambium, outer xylem (living sapwood), and the inner xylem (non-living heartwood). The outer bark provides a non-living barrier between the inner tree and harmful factors in the environment, such as fire, insects, and diseases. The cork cambium produces bark cells. The vascular cambium produces both the phloem cells (principal food-conducting tissue) and xylem cells of the sapwood (the main water storage and conducting tissue) and heartwood.
Forest ecologists defined five broad stages in tree decay, shown by the condition of the bark and wood and presence of insects and other animals. The first two stages evolve rapidly; much more time elapses in the later stages, when the tree sags to the ground. These latter stages can take decades for the tree to break down completely and surrender all of itself back to the forest. A fallen tree nurtures, much like a “mother” archetype; it provides food, shelter, and protection to a vast community—from bears and small mammals to salamanders, invertebrates, fungus, moss and lichens. This is why fallen trees are called “nursing logs.”
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Heralds & Tricksters
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I stop to inspect another fallen tree lying on a bed of decaying maple, beech and oak leaves. When a fallen tree decomposes, unique new habitats are created within its body as the outer and inner bark, sapwood, and heartwood decompose at different rates, based in part on their characteristics for fine dining. For instance, the outer layers of the tree are rich in protein; inner layers are high in carbohydrates. This log—probably a sugar maple judging from what bark is left—has surrendered itself with the help of detrivores and saprophytes to decomposition and decay. The outer bark has mostly rotted and fallen away revealing an inner sapwood layer rich in varied colours, textures and incredible patterns—mostly from fungal infestations. In fact, this tree is a rich ecosystem for dozens of organisms. Wood-boring beetle larvae tunnel through the bark and wood, building their chambers and inoculating the tree with microbes. They open the tree to colonization by other microbes and small invertebrates. Slime molds, lichen, moss and fungi join in. The march of decay follows a succession of steps. Even fungi are followed by yet other fungi in the process as one form creates the right condition for another form.
Most hardwoods take several decades to decompose and surrender all of themselves back to the forest. In western Canada’s old growth forest, trees like Western redcedars can take over a hundred years to decay once they’re down. The maple log I’m studying in Ontario’s Carolinian forest looks like it’s been lying on the ground for a while, certainly several years. The bark has fragmented and mostly fallen away, revealing layers of sapwood in differing stages of infestation and decay. Some sapwood is fragmented and cracked into blocks and in places looks like stacked bones.
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Black lines as though drawn by a child’s paintbrush flow through much of the sapwood; these winding thick streaks of black known as “zone lines” are in fact clumps of dark mycelia, which cause “spalting,” the colouration of wood by fungus. According to mycologist Jens Petersen, these zone lines prevent “a hostile takeover by mycelia” from any interloping fungi. Most common trees that experience spalting include birch, maple, and beech. Two common fungi that cause spalting have colonized my maple log. They’re both carbon cushion fungi.
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Spalting on a decaying maple log, Little Rouge Woodland, ON (photo by Nina Munteanu)
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Much of the exposed outer wood layer looks as though it has been spray painted with a green to blue-black layer. The “paint” is caused by the green-stain fungus (Chlorociboria) and blue-stain fungus (Ceratocystis). Spalting is common because of the way fungi colonize, in waves of primary and secondary colonizers. Primary colonizers initially capture and control the resource, change the pH and structure of the wood, then must defend against the secondary colonizers now able to colonize the changed wood.
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Shapeshifting Characters
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I find moss everywhere in the forest, including beneath the forest floor. Moss is a ubiquitous character, adapting itself to different situations and scenarios. Like a shapeshifter, moss is at once coy, hiding beneath rotting leaf litter, stealthy and curious as it creeps up the feet of huge cedars, and exuberant as it unabashedly drapes itself over every possible surface such as logs, twigs and rocks, and then proceeds to procreate for all to see.
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Moss hides under dead leaf litter on the forest floor, Little Rouge Woodland, ON (photo by Nina Munteanu)
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Mosses help with nutrient cycling because they can fix nitrogen from the air, making it available to other plants. Mosses thrive in the wet winter and spring, providing brilliant green to an otherwise brown-gray environment. Even when covered in snow (or a bed of leaves), moss continues its growth cycle, usually in the leafy gametophyte stage. In the spring the capsules release spores that can each create a new moss individual. Moss is quietly, gloriously profligate.
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Team Players
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Lichens are a cooperative character; two characters in one, really. Lichens are a complex symbiotic association of two or more fungi and algae (some also partner up with a yeast). The algae in lichens (called phycobiont or photobiont) photosynthesize and the fungus (mycobiont) provides protection for the photobiont. Both the algae and fungus absorb water, minerals, and pollutants from the air, through rain and dust. In sexual reproduction, the mycobiont produces fruiting bodies, often cup-shaped, called apothecia that release ascospores. The spores must find a compatible photobiont to create a lichen. They depend on each other for resources—from food to shelter and protection.
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The Ecology of Story: World as Character
Place ultimately portrays what lies at the heart of the story. Place as character serves as an archetype that story characters connect with and navigate in ways that depend on the theme of the story, particularly in allegories that rely strongly on metaphor. A story’s theme is essentially the “so what part” of the story. What is at stake for the character on their journey. Theme is the backbone—the heart—of the story, driving characters to journey through time and place toward some kind of fulfillment. There is no story without theme. And there is no theme without place.
–Excerpted from The Ecology of Story: World as Character
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Nina Munteanu is a Canadian ecologist / limnologist and novelist. She is co-editor of Europa SF and currently teaches writing courses at George Brown College and the University of Toronto. For the lates on her books, visit www.ninamunteanu.ca. Nina’s bilingual “La natura dell’acqua / The Way of Water” was published by Mincione Edizioni in Rome. Her non-fiction book “Water Is…” by Pixl Press (Vancouver) was selected by Margaret Atwood in the New York Times ‘Year in Reading’ and was chosen as the 2017 Summer Read by Water Canada. Her novel “A Diary in the Age of Water” was released by Inanna Publications (Toronto) in June 2020. You can read her just released eco-fiction thriller Gaia’s Revolution by Dragon Moon Press.
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