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Archive for November, 2013

Thimbleweed Seeds Dispersing

11-29-13 thimbleweed 033Although it has a beautiful white flower, Thimbleweed, Anemone virginiana, is not as noticeable in the summer as it is when its seeds mature in the fall. Looking like a small ball of cotton, its thimble-shaped seedhead consists of a cone covered with tiny dark hooks that white, fluffy seeds cling to and cover until the wind carries them away from the parent plant. The seedhead of this member of the Buttercup family looks very much like that of its close relative, Long-head Thimbleweed, Anemone cylindrica, except A. cylindrica’s seedhead is slightly longer. As impressive as these eastern species are, there’s a species of Thimbleweed out West whose seedhead is so big the plant is referred to as “Mouse on a Stick.” In the summer, plant-eating animals usually leave Thimbleweed alone because the foliage contains a blistering agent that can irritate the mouth parts and digestive tract.

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11-28-13  Thanksgiving hen and toms  IMG_7362 Thanks to Chiho Kaneko and Jeffrey Hamelman for photo op.


Few Northern Finches This Winter

11-27-13  pine siskin-irruption forecast IMG_8713Every year Ron Pittaway of the Ontario Field Ornithologists (http://www.jeaniron.ca/2013/forecast.htm) forecasts the extent to which birds in the Finch family are expected to inundate northern New England in the coming winter. This year’s forecast is not looking great for birders hoping to see influxes (irruptions) of northern seed-eating species such as pine siskins (pictured), crossbills, redpolls, grosbeaks and finches. The reason for the lack of inundations of feathered northern visitors this winter is that the Canadian crop of seeds that these birds eat is more than ample this year, making it unnecessary for most seed-eating birds to come further south seeking food. With the exception of white pine, there is an abundance of cone crops as well as birch, alder and mountain-ash seeds and fruits this year in the boreal forests of Ontario and southern Quebec. Although there will be some southern movement of these birds, this is not predicted to be an irruptive winter, which bodes well for seed-eating birds, but not so much for bird-seeking humans.

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Backswimmers Active Under Ice

11-18-13  backswimmers under ice 061Backswimmers are insects classified as “true bugs” and belong to the order Hemiptera. Most Hemipterans are land dwelling, such as stink bugs and assassin bugs, but there are a few, such as water striders, water boatmen and backswimmers, that are aquatic. In the fall, when most insect hatches have ceased, backswimmers come into their own. While some hibernate at the bottom of ponds in winter, others remain active, sculling through the water with their oar-like hind legs that are covered with fine hairs, preying on all forms of life up to the size of a small fish. Thanks to bubbles of oxygen that they obtain from pockets of air just under the ice and carry around with them like mini aqua lungs, backswimmers can continue to stay below the surface of the water for several minutes. Like most aquatic insects, backswimmers supercool their bodies (produce antifreeze compounds called cryprotectants that allow their body fluid to go down to 26 to 19 degrees F. without freezing). Right now, when there’s a thin layer of ice on most ponds and no snow covering it, you might want to peer through the ice at the edge of the pond to see if you can locate any of these cold-hardy creatures. Just be sure you don’t fall in, as I did two seconds after this photograph was taken. My undying gratitude for those of you who have donated to Naturally Curious, as your support enabled me to replace both camera and lens!

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White Pine Cone Growth

11-25-13 white poine final seed cones 007The female, or seed, cones of most pines take two seasons to mature, and the cones of White Pines are no exception. While their tiny male cones live only a few months in the spring, until their pollen has been dispersed and they drop to the ground, White Pine seed cones develop over two summers. This means that both last year’s cones as well as this year’s can be seen on a White Pine right now. After the seeds in last year’s cones have been dispersed (some time this fall or winter), the cones fall off the tree. In late winter, you will find mostly year-old cones on White Pines; new cones will develop next summer to replace the cones that fall off the tree this winter.

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Beavers’ Last Hoorah

11-22-13  beaver dripping 107We’re right on the edge of when beavers will no longer be able to smell fresh air, see the sun and obtain fresh bark. Until the temperature drops to around 16 degrees F. they continue to break through the thin ice covering their pond. Once the temperature drops to 16 degrees F., they no longer try to break through the ice and are sealed under it until spring, unless there’s a mid-winter thaw. Once they are confined by the ice, their activities outside the lodge are minimal. Beavers leave their lodge in winter primarily for two reasons: to swim out to their winter food supply pile and retrieve a stick which they bring back into the lodge to eat, and to defecate. Other than those excursions, they spend most of their day in the dark, enduring a lodge temperature of about 34 degrees F. (Thanks to Kay Shumway for photo op.)

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Did you know…

11-20-13 black-capped chickadee IMG_0107Black-capped Chickadees actually refresh their brains once a year. According to Cornell’s Laboratory of Ornithology, every autumn Black-capped Chickadees allow brain neurons containing old information to die, replacing them with new neurons so they can adapt to changes in their social flocks and environment.

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