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News

  • Floodplain provides wildlife habitat during high water

    Dave Anderson, Ellen Kenny
    May 2, 2023

    The silver maple floodplain forest is specifically adapted to withstand the extreme flooding regime of the larger rivers in NH.

  • Forestry Friday: Why Bees Need Forests Too

    Gabe Roxby
    April 7, 2023

    A new study estimates that one-third of our native bees in the northeast are forest specialists, taking advantage of the nectar and pollen produced by trees and spring ephemerals in the forest understory.

  • Forest Journal: A Fond and Feathered Farewell from Grandfather's Birds

    Sophie Oehler
    April 2, 2023

    After the passing of her Grandfather, Sophie Oehler reflects on birds and their meanings during our grieving process.

Cold In New Hampshire

Dave Anderson, Chris Martin
January 16, 2015
Wildlife
Winter's cold can pose challenges and advantages for wildlife and trees.

Right now the northern hemisphere is tilted away from the sun.  Light enters our atmosphere at a much shallower angle and for fewer hours each day.  To put it simply, it's cold in New England. And as sure as January's cold the usual grumblings from residents about the plunging mercury abound.  It isn’t surprising when you consider how poorly adapted we humans are for living in the cold.  However, adaptations in other species in New Hampshire have allowed them to flourish.  

Chickadee adaptations to cold. Graphic Sara Plourde, NHPR

How do their feet not freeze off? 

Chickadees, for instance, somehow manage to hang out on snow-covered bird feeders without fear of their feet freezing off.  Fact is, their feet are mostly bone and scales, there's very little flesh to develop frost bite or gangrene.

They've also developed a couple of ways to keep the blood where it is needed most. They restrict the blood flow to their feet, which allows them to keep the warm stuff in their core and maintain body temperatures.   Shivering is another adaptation these birds have use to protect themselves during the cold winter months.  When the sun goes down, they shiver, raise their metabolism, generate a little heat, and then they shut down and get cold.  At a certain point, the shivering mechanism kicks on again to generate heat. 

These adaptations give an advantage to chickadees and other birds that spend the winter in New Hampshire.  They save themselves the rigors they would have spent and dangers they would have had to endure by migrating to points well south of here and back again.  Plus, they get an early start on breeding and frequently can have multiple broods while their migrating cousins usually only have enough time for one.

Hemlock Wooly Adelgid Photo Blue Ridge Kitties

 

Cold means death for some and salvation for others

Cold means death for some species like the hemlock wooly adelgid, an insect that cannot survive long stretches of cold, which means it has mostly stayed out of New Hampshire.  And in turn, the cold is salvation for other species - like the hemlock the adelgid feeds on.  The insect is killing hemlocks in milder parts of the country but here in New Hampshire hemlocks have a leg up.  

Light bark is an adaptation of birch and aspen. Graphic Sara Plourde, NHPR

 

The further north you go the more light-barked trees you'll see. 

Bark is an adaptation of trees to cope with the climate.  There are trees with light colored bark and trees with dark colored bark.  While we warm blooded animals might wear dark clothes to absorb sunlight and stay warm, trees don’t get the same benefits.  Dark bark absorbs sunlight, warming up the tree during the day, then temperatures plunge at night.  This kind of warming and cooling prompts daily freeze/thaw cycles, resulting in cracks in the bark, exposing trees to all kinds of injuries and infections.

In New Hampshire, we see a lot of birch trees, beech trees - trees with light bark.  The further north you go the more of the light-barked trees you’ll see.  Farmers apply this principal to apple trees by painting their trunks white, providing protection for the bark of the tree - and next year’s crop of apples!

We hope you'll take some time to appreciate the amazing ways in which life adapts to the cold this winter.  And remember warmer weather is sure to return soon, as sure as Something Wild will return next week.  In the meantime keep your bark warm!

 

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Society for the Protection of New Hampshire Forests54 Portsmouth St.Concord, NH 03301
Phone: 603.224.9945Fax: 603.228.0423info@forestsociety.org
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