Extension News: January 2008 Archives

Although the temperature had gotten down to the teens last night, it didn’t seem really cold this morning. Still, the ice in the swamp spoke today. The Ice Monster’s children were playing and calling out to each other from different parts of the swamp.

First, one side of the swamp would give out a groan. Almost immediately, another side would respond with a crack. A brief spell of silence, then a new call from another area, followed shortly by a response from a different portion of the swamp. I’d never heard the ice call out this early in the season before, but it sure had a lot to say today.

A few weeks earlier I’d heard some different sounds from the ice, sounds made by a four-legged animal, probably a moose, walking through the partially frozen swamp. Creak, crack, creak, crack. With each step, the animal broke through the thin ice and sent a shiver of sound through the night air. The poor ice monsters had probably been entertaining the thought of sending their children out to play when the moose came along to disrupt their playing field.

Usually the ice speaks only deep at night when the temperature is below zero. We hear it then, on those nights known as “rafta snappas,” nights when the roof rafters groan and seem to snap suddenly. The ice, of course, does the same thing on those nights. The deep cold causes the ice to contract; suddenly, there’s a sharp SNAP and a crack appears through what had been a solid sheet of ice.

These cracks aren’t just surface deep, but extend all the way through the ice. During the day, the winter sun shining down at an angle warms the water through the ice and the water rises up into the cracks, only to freeze again overnight. In this way, the ice moves across the surface of the lake or pond. When the ice comes up against an island or the shore, it pushes up whatever is in its way-boulders, small stones, debris. Over time, these are moved higher up the shoreline, to sit well above the water of summer. While I know the scientific reason, I prefer to say that the new locations came about from the ice monster family playing their games on cold winter nights.

We don’t usually think about how many types of ice exist in nature or how the ice is formed, but we should. Most of us probably just think that cold temperatures equal ice and we head out to play. Unfortunately, it’s far more complicated than that.

While surface ice thickens as it migrates downward into the body of water, a snow cover will slow the heat loss to the atmosphere. If the ice isn’t thick enough before becoming snow covered, it will take more freezing nights to make that ice thick enough to hold our weight or that of our vehicles. Furthermore, turbulence in the water will mix the surface-cooled water with warmer water below, causing the formation of frazil ice. This form of ice is very fragile and not something we should be playing on.

The different types of ice make any on-ice winter activity one that calls for caution on our part. Knowing where the springs are in a lake, knowing where warmer water may have entered the lake in fall, understanding that not all ice is as solid as it appears, can keep us safer when we are on the ice, fishing, cross country skiing, snowmobiling, skating, and ice boating.

The ice monsters don’t have to worry about all that, though. The variations in ice just add to their vocabulary. As water freezes, it expands, and the ice monsters will call out with one voice. Later, during those deep cold spells, the contracting of the ice brings forth a different voice from these denizens of the winter swamps and ponds. “The ice monsters are back,” we say as we snuggle down under an extra comforter. “They sure are talkative tonight."

Eventually, the sun moves higher in the sky, and its rays strike the water from a different angle. Now comes a new change. The water lower down begins to heat up as the sun warms it through the ice. Air bubbles begin to form and work their way through the softening ice. The warmer water rises and rises, and suddenly the ice “turns turtle.” You can look out at the ice at 10 a.m., and it appears solid enough to walk on, but come back at 1 p.m., and you’ll see only water. No, the ice hasn’t melted; it has sunk below the warmer water that had risen from the deeper areas.

This is the time for the ice monsters to go back into hibernation. Many months will pass before we hear their groans and creaks again. Ah, but spring is still some weeks away. For now, the ice monsters play and we humans can join them.

By Susan M. Poirier, Master Gardener

It was a perfect winter day. On the horizon, the clear blue sky was bordered by a narrow ruffle of puffy clouds. Eight inches of powdery snow covered the ground. The temperature was cool, but the warming sun pulled me outside. I dressed quickly, eager for whatever I might find in the fresh, crisp air.

I trudged out past the bird feeders and along the path which runs between the stone walls of the vegetable and daylily gardens, down the hill, and through the gate in the fence. I was headed, as always, for the swamp to see what I might find on this beautiful day. As I walked along the fence, I saw that I’d had company sometime before this morning’s light snowfall. There along the outside of the fence were the tracks of a bobcat. The new snow had partially filled them in, but the size and spacing convinced me that the big cat had been prowling along our fence once again. Whether it comes in the fine weather or not I don’t know. I suppose it might walk all around the swamp to get to this fence. I’ve no real way of knowing, but every winter, once the snow has fallen, I know by its tracks that it’s come across the ice to patrol here once again.

I followed the tracks down the hill and into the swamp, but a step or two quickly convinced me that the ice just wasn’t ready yet for my weight. As my eyes followed the cat’s tracks across the ice, I wished I’d thought to bring along the camera. The beavers’ lodge was so lovely with its cloak of snow. The orange-topped surveyor’s stake, which the beavers had appropriated to add to their home, was covered now with white and looked from here like just another branch.

I walked further along the swamp’s edge, and I suddenly startled a dozen doves. Off they flew with a call of alarm so unlike their normal mourning coo. Their explosion from the tree where they’d been resting masked a tap-tap-tapping sound which I’d not noticed before. Once the birds were gone, I followed the sound with my eyes until I found a hairy woodpecker on a tall, narrow tree.  

The woodpecker’s beautiful black and white coloration, as well as its large size, is always a marvel to me. This one, a female, lacked her mate’s brilliant red patch on the back of the head. Still, the wide white streak down the center of her back was perfectly balanced by the white and black stripes of her wings. Down the trunk she came, probing, listening, tapping here and there. After she worked her way down about five feet, she returned to her starting point and moved a few inches over to repeat the track. Down and up, tail pressed tightly against the smooth bark, head cocked to one side and then another before the strong bill drilled in to test the wood for succulent insects.

Where does she hide when the temperatures drop down into the low digits? I presume she has a favorite hole somewhere to snuggle down in. Today, in the brilliant sunshine making its way through the leafless trees, she stands out with clarity and beauty.

A few moments later, something startled the doves from their new resting place, and once more they burst forth with their danger call. A chickadee nearby picked up the alarm and warned others of my presence. “Chick–a-dee-dee-dee.” I read recently what scientists have learned: the number of “dees” a bird calls indicates the type of danger.

“Hey,” I called softly to it. “Don’t you recognize me? I’m the one who fills the feeder with sunflower hearts!”

I love the chickadees. Not only are they such lovely small beings, but they are the politest of birds at the feeders, taking only one seed before flying away to consume it. This one left me after a moment or two and headed back to the feeder for another morsel.

With a sigh, I realized that I had to follow suit. Reluctantly I left the world of beauty, of nature, of outside and returned to the house. “I’ll be back,” I promised both myself and the woods. I know I will. I’ll be beckoned again, and I’ll answer.

 By: Susan M. Poirier, Master Gardener