Among thirty water bodies surveyed in the region, Glendale Lake stands alone as…
June 29, 2026
Among thirty water bodies surveyed in the region, Glendale Lake stands alone as officially impaired — a designation that carries weight in a landscape where the other waters remain in compliance. The lake requires a restoration plan under federal law, yet the source of its decline is neither mysterious nor distant.A dairy operation upstream exceeded its organic waste limit by 183 percent in early 2026, the kind of overage that typically worsens when summer heat arrives and water levels drop. With the surrounding landscape still 74% forested—a reminder that this was forest country not long ago—the remaining 17% in active agriculture now concentrates enough pressure to impair the only failing lake in the survey. The failure names precisely where the agricultural margin has narrowed: not across the whole ecoregion, but in one drainage where a single facility's permitted capacity cannot absorb the load it generates.
Gray treefrogs call through the longest nights
June 5, 2026
The air holds its warmth past ten o'clock near Asheville, and from the wetlands comes a sound like distant machinery. Gray treefrogs have emerged from their daytime roosts in the bark crevices and hollow stems where their mottled skin renders them invisible. Now, as darkness settles over the ponds and slow streams, the males position themselves on low branches and begin their territorial calls.The gray treefrog spends most of its life as a solitary hunter, climbing through shrubs and low trees with the adhesive pads on its toes. Its skin shifts from gray to green to brown, matching whatever surface it rests against during the day. But early summer transforms these cryptic climbers into something else entirely. The males gather at the water's edge, their throat sacs inflating like pale balloons as they produce their prolonged trills. Each call lasts several seconds, a steady vibration that carries across the water and through the humid air.This timing connects to more than just the calendar. Aquatic insects are emerging from the ponds and streams in waves during these longest days. Midges, mayflies, and caddisflies complete their underwater larval stages and rise to the surface, where they molt into their winged adult forms. The gray treefrogs feed heavily on these emerging insects, building the energy reserves they need for breeding. More importantly, the same insect emergence will sustain their tadpoles once the eggs are laid and hatched. The female treefrogs deposit their eggs in shallow, temporary pools where the water warms quickly and algae blooms provide food for the developing larvae. These pools teem with the same aquatic invertebrates that drew the adults to breed here.Green frogs call from deeper water nearby, their single-note banjo twangs punctuating the treefrogs' sustained trills. The two species partition the acoustic space, the green frogs calling from permanent ponds while the gray treefrogs choose the shallower, more temporary waters. Each species times its breeding to match the peak availability of different food sources. The green frog tadpoles will overwinter in the deep water, feeding on detritus and algae through the cold months. The gray treefrog tadpoles must complete their entire development before their shallow pools dry up or freeze, racing through metamorphosis in a matter of weeks.The calls continue past midnight, when the air finally begins to cool and dew starts to form on the grass stems. If you step outside now, the mechanical trill of the gray treefrogs carries across the darkness, steady and insistent, marking the peak of their brief breeding window in the longest nights of the year.
Warblers and the spring leaf-out feast
May 21, 2026
The canopy at State Game Lands 267 has reached full leaf-out, and the forest hums with a different energy than it held just weeks ago. Fresh leaves unfurl in every shade of green, from the pale yellow-green of new oak to the deeper emerald of mature maple. If you're walking beneath these trees, you might notice something else: the constant movement in the branches above, quick flickers of yellow and black and white weaving through the foliage.Black-and-white Warblers spiral up the trunks like living bark, their striped patterns breaking up their outline as they probe for insects hiding in the crevices. Chestnut-sided Warblers dart between the outer branches, their bright yellow caps catching the filtered light as they snap up caterpillars from the undersides of leaves. Black-throated Blue Warblers work the middle story, the males' deep blue backs contrasting sharply with the green backdrop as they glean insects from branch to branch. Each species occupies its own layer and hunting method, but they're all here for the same reason: the explosion of insect life that follows the spring leaf-out.This timing is no accident. As the trees push out their tender new growth, caterpillars emerge to feed on these protein-rich young leaves. The Hickory Tussock Moth caterpillars, fuzzy white with black tufts, appear just as the hickory and walnut leaves reach their most nutritious stage. Other moth and butterfly larvae follow similar schedules, each species synchronized with its preferred host plants. The result is a brief but intense period when the forest canopy becomes a banquet table loaded with soft-bodied, protein-packed prey. For the warblers, this feast couldn't come at a better time. They've just completed their spring migration, burning through fat reserves to fuel thousands of miles of flight. Now they need to rebuild their energy stores and, for many species, prepare for the demands of breeding season. The abundance of caterpillars provides exactly what they need: high-quality protein in easily digestible packages. A single Black-and-white Warbler can consume hundreds of small caterpillars in a day, each one helping to restore the bird's condition after its long journey north. The Chestnut-sided Warblers, many of them establishing territories and courting mates, require this protein boost to produce eggs and feed their eventual nestlings. The relationship runs deeper than simple predation. The warblers help control insect populations that might otherwise defoliate the trees, while the insects provide the energy that allows these birds to successfully reproduce in Pennsylvania's forests. The timing window is narrow. Peak caterpillar abundance lasts only a few weeks, and the warblers have evolved to arrive precisely when this resource becomes available. Miss the window, and breeding success plummets. Arrive too early, and there's not enough food to sustain the energy demands of territory defense and courtship.
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