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Archive for the ‘Biodiversity’ Category

sensitive ferns

Sensitive Ferns

Ferns add a touch of freshness and elegance to Nova Scotia’s forest floors in late spring.  These beautiful green plants can also be found growing along ditches and in rock crevices.

Ferns first appeared on the planet hundreds of millions of years ago and are still thriving.   They reproduce by spores or rhizomes and are quite resistant to disease.  Ferns provide the surrounding soil with mineral nutrients while the structure of their rhizome root systems reduce soil erosion.  The sensitive leaves of these bioindicators are easily damaged by acid rain.

Cinnamon Ferns

Even in Nova Scotia’s temperate climate, ferns can grow to several feet in height.  Their leaf litter is so great that mounds are often formed in forest areas where they thrive from year to year.

polypody ferns

Polypody Ferns

Moisture, shade and acidic soil attract the growth of both ferns and mosses.  Polypody ferns, shown above, crop out of rocks near the salt marsh.

Bracken Ferns

In springtime, many people enjoy eating fiddleheads, the shoots of young ferns.  Ostrich ferns are especially tasty.  However, the safety of bracken ferns, shown above, is questionable.  Its consumption has been implicated in cases of stomach and esophageal cancer, especially in Japan where it is widely eaten.  Water from sources near growths of bracken ferns is also considered suspect.  (For more information on the toxic effect of bracken ferns on water, see The Fatal Fern).

Northern Beech Ferns

Shaded northern beech ferns, shown above, capture bits of sunlight through gaps in the forest canopy.  The effect is enchanting.

In Finland, gathering fern spores on Midsummer’s Eve is believed to give the gatherer the ability to become invisible.  Also, if one was to perchance acquire the elusive fern bloom on this special night, one would be able to uncover the treasure hidden beneath the magical lights of the Will o’ the Wisp.

Even if you don’t believe in the magical powers of ferns, or partake of fiddleheads in spring, they nevertheless make a wonderful contribution to the biodiversity of the forest ecosystem.

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Red-backed salamanders are always a joy to find lying under rocks and beneath the dead leaves in the woods.  They are most frequently seen on moist days in spring and fall.

These woodland salamanders are amphibians but do not lay their eggs or have a larval stage in water.  Adults are lungless and breathe through their skin.  Consequently, moist surroundings are crucial to their survival and they are very sensitive to slight changes in their environment.  As the weather warms or cools, salamanders bury themselves deeper in the ground or under logs.

Years ago, salamanders became associated with fire, probably because they’d seemingly come to life when logs, to which they were clinging, were flung into the fire.  Considered by some to be magical creatures, they’ve been known to exist since the Jurassic period.

These small creatures eat tiny arthropods found in leaf litter.  Their numbers can be quite numerous in eastern American woodlands.  Although they keep a very low profile, salamanders contribute to the biodiversity of their habitat and play an important role in the natural recycling process of the forest. 

Their gentle nature endears salamanders to many.  Scientists see them as bioindicators,  and employ their numbers to indicate the health of woodlands.  Threatened by clear-cutting and extremely vulnerable to fungi and disease, their absence from an ecosystem is cause for concern.  Perhaps because of their fragility and silent presence in the woods, these red-backed salamanders are my favorite amphibians.

Humans are amphibians – half spirit and half animal. As spirits they belong to the eternal world, but as animals they inhabit time.
~ C.S. Lewis

For more information about the mythology surrounding salamanders, see Dragonorama.

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Three species of spruce trees are found in Nova Scotia: white, red and black. All three types grow around Flandrum Hill.  Tolerant of shade, they’re often found in stands together along with balsam fir, yellow birch and sugar maple.

All are shallow-rooted and susceptible to being toppled by strong winds. The black spruce can be especially top heavy and is best left growing in a stand in order to remain windfirm.

Ripe cones of all three are closed and leathery during wet weather, and open and hard when it’s dry.

White spruce often has a whitish cast to its green or bluish-green needles. Bark is light greyish-brown. Its cones are the longest of the three types, usually up to 2 inches in length.  Green at first, they turn brown in autumn and fall off the tree in winter.

Red spruce growth is confined to Eastern Canada.  It is Nova Scotia’s provincial tree. Needles are yellowish-green. Bark is light reddish-brown. Red spruce can interbreed with black spruce, sometimes making identification between the two difficult.  Cones fall off the tree either in winter or the following spring.

Black spruce have blunt tipped needles that are the shortest of the three (1/2″ long).  These trees are often stunted in growth when situated on boggy soil.  Bark can be greyish to reddish brown.   Their cones are egg-shaped and can stay on the tree for years.  They can be extremely hard and difficult to open.  Individual seeds are black.

The ability to grow new trees by rooting lower branches in wet moss is unique to black spruce. 

Some diseases and pests have a tendency to prefer one type of spruce over another.  It’s best to keep a diversity of trees on your lot, should one species of tree be affected. 

References:  Native Trees of Canada by R.C. Hosie and Trees of Nova Scotia by Gary L. Saunders

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After numerous days of torrential rains and relentless wind gusts, it’s refreshing to get a glimpse of blue in the sky.  Could winter’s fury finally be giving way to a calm resignation that its days are numbered?

Strong winds caused many tired and weakened trees to snap.  There seem to be even more diagonal lines in the forest. 

Rain water has gathered in the recesses beneath uprooted trees and in lower lying areas in the woods.  Known as vernal pools, these temporary wet areas not only provide animals with access to fresh drinking water, but also contribute to the biodiversity of the forest.  Amphibians thrive around these pools as do numerous varieties of mosses and grasses.  They will slowly dry up, but be filled again during subsequent rainstorms.

The rain melted all the snow, which is not at all good for snowshoe hares still wearing their winter white coats.  By contrasting more with the landscape, they become easier prey for foxes, coyotes and bobcats.  Hares will begin acquiring their brown coats later this month.  Until then, they’ll just have to keep a low profile and run a little bit faster if they want to survive until spring.

After every storm, the sun will smile;  for every problem there is a solution, and the soul’s indefeasible duty is to be of good cheer.
~ William Alger

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Just a few centuries ago, tall white pines dominated Nova Scotia’s landscape.  Most were ten stories high but several even reached fifteen stories in height.  Looking at the much shorter firs and spruce that make up the majority of our woods now, it’s hard to believe that the landscape here was once so different. 

Nova Scotia 1817 by J.E. Woolford in the Nova Scotia Museum collection

Sketch of Forests near Halifax circa 1817

The first settlers from Europe must have been awestruck by the majesty of the forests they encountered.  But they soon logged them and cleared the way for agriculture.  Today, old growth forests are found on less than 1% of the province’s land. 

In Cow Bay and nearby Eastern Passage, tracts of forest continue to be cleared to make way for residential development.  Most of the time, the trees are removed to facilitate construction.  Isolated trees that are left standing die within a few years as they are shallow rooted and top heavy, due to spending most of their life stabilized by other trees in a stand.

Clearing near Flandrum Hill offers a view of Osborne Head

Trees that are fifteen stories high don’t reach that height overnight.  White pine have a lifespan of up to 450 years.  Eastern hemlock can live up to 800 years.  By cutting down an old growth forest, it’s almost ridiculous to say that you’ve done the planet some good by planting a thousand new seedlings.  Yet, incentives created to fight climate change often give points for new plantings while ignoring the destruction of old trees.

Biodiversity thrives in old growth forests.  Many species of plants (mosses and orchids) and animals (barred owls, wood ducks, fishers and American martens) depend on old large trees for their survival.  Some creatures nest in the cavities of standing trees, while others make dens beneath large trees that have fallen to the ground.   

As I write this, I can hear wind gusts of up to 75 km/hr (47 mi/hr)  thrashing the firs and spruce back and forth outside my window.  They’re shallow rooted and susceptible to coming down in strong winds.  The only white pine in the yard was planted by me almost 20 years ago and is protected in a stand.  If it’s allowed to reach its life expectancy, it will likely provide a home for wildlife in 2440.

God has cared for these trees, saved them from drought, disease, avalanches, and a thousand tempests and floods.  But he cannot save them from fools. 
 ~John Muir

For more information about Old Growth Forests, see Nova Scotia Nature Trust’s pdf on the subject.

Details of the 1817 J.E. Woolford image of Nova Scotia woods can be found at the Nova Scotia Museum Collection.

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City or suburb dwellers frequently decide to build their dream home in the country.  They find a nice spot brimming with wildlife and trees.  They look forward to waking up to the sound of birds in the morning and seeing hares and pheasants in the yard. 

But before you can say ‘Where’s my chainsaw?’  they’ve cleared out most of the trees and levelled the land.  Within a few years, their driveway’s paved and their lawn looks almost as neat and tidy as the one they left behind in the city.  (For my role in this, see Confessions of a Woods Cleaner).  They may plant some non-native ornamental trees and bushes and regularly weed their new flower beds.  Unfortunately, the hares and frogs have hopped out of the neighborhood as has much of the other wildlife.   

Does it have to be this way?  No, it doesn’t.

Wildlife and woods go together.  It’s almost impossible to have one without the other.  But woods are messy in their natural state, and most humans like to keep their environment looking neat.  However, the diversity of native plant and animal life shrinks astoundingly when land is cleared to make way for clean-cut lawns and pristine flower beds.

For example, many wild birds, such as woodpeckers, thrive in old growth forests.  When old trees are cut down, it’s no surprise that the woodpeckers leave the neighborhood.  They depend on these old trees for nests and the insect life within them for food.

Vernal pools created by toppled trees and an uneven forest floor collect rainwater and provide a habitat for amphibians and a greater variety of plants.  (For more information on attracting amphibians back to your yard, see my post on Why Every Princess Needs a Toad in her Garden).

The United Nations has designated 2010 as the Year of Biodiversity.  You can read more about why biodiversity matters here.  If you own land, you might consider leaving some of it in its natural state.  One simple solution is to allow wild spaces to thrive on the edge of your property.  Allowing the growth of wild hedgerows between properties provides privacy and a wind barrier between neighbors while sustaining native species of both plants and animals.  

By allowing a wild space to thrive in your yard, you’ll be pleasantly surprised at the diversity of life that it will begin to attract.

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The rat, the mouse, the fox, the rabbit watch the roots.
~ William Blake

Challenged by Lake Superior Spirit to find six new and interesting views of things you have noticed or photographed before, I decided to get to the root of the matter.  Under the root to be more exact.  Since I’m so accustomed to photographing the part of trees that grows above ground, or looking at upturned trees from the outside, I thought I’d crouch under a very large Balsam Fir root and see what a small mammal might see if it was hiding there.

The first thing I noticed was how dark and quiet it was under the root.    

Balsam Firs tend to be shallow rooted and so are easily blown over during high winds. 

After falling to the ground, the roots of large trees remain intact, with some strands dangling to the ground.  Many provide hut-like enclosures that offer shelter for small animals.

Often, new trees start growing in the dirt left clinging to the upturned roots.  Over time, these roots eventually form mounds in the forest which help to speed up the rate of new growth.

Water often gathers under overturned roots.  Though presently frozen, these vernal pools provide places for amphibians to lay eggs or small mammals and birds to get a drink of water during warmer months.  The variety of life found around the roots of these overturned trees contributes greatly to the biodiversity of the forest.

For more information and photos of overturned trees taken from a vantage point out from under the roots see Pits and Mounds.

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In an effort to increase awareness and encourage positive change, 2010 has been designated the International Year of Biodiversity by the United Nations.

What is biodiversity?
Basically, it’s the variety of life on earth: plant and animal species and the ecosystems that sustain them.

How does this variety affect our daily lives?
From the foods we eat to climate change, biodiversity affects us all.

Why should we be concerned?
Loss of biodiversity on the planet is happening at a rapid rate.
For example…
- Forests are being changed into croplands with devastating effects to climate.
- Species of plants and animals are being harvested at unsustainable rates.
- Changes to the timing of flowering and migration routes are affecting relationships between species within ecosystems.
- Introduced invasive species (plants, animals and micro-organisms) are threatening native species by competing for food and habitat.
- Pollution is creating dead zones in the ocean which can no longer sustain life.

What can be done at the local level?
Doing something about biodiversity can be as simple as encouraging the growth of native trees in your yard as opposed to growing exotic species that require extra maintenance to ensure their survival.  It’s always amazed me how people move from the city to the country wanting to be close to nature, and then work so hard to tame the wild spaces in order to make them look ‘civilized.’

In the year ahead, I’ll be writing more on the subject of biodiversity, but for now it’s enough to simply introduce the subject.

We cannot win this battle to save species and environments without forging an emotional bond between ourselves and nature as well – for we will not fight to save what we do not love.
~ Stephen Jay Gould

For more information about 2010 as the International Year of Biodiversity, see the Convention on Biological Diversity.

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