Feeds:
Posts
Comments

Archive for the ‘Declining Populations’ Category

Those of you that have been following along here at the blog know that I have been photographing frogs and toads in vernal ponds found in an abandoned cattle pasture behind my home for a number of years. Vernal ponds are temporary pools of water that are critical habitat relied upon by frogs and toads as breeding sites every spring. Each and every spring chorusing frogs and toads would filled the air with song. Late last fall, the land which was zoned for agriculture was sold to an industrious farmer who promptly cleared every tree that lined the plots of land and then plowed the land. By plowing the land the farmer wiped out much of the frog and toad population in the immediate vicinity of my rural home.

As the temperatures began to warm this spring I would listen intently from my back deck listening for the songs of chorus frogs, which are always the first frogs to emerge from hibernation. A couple of weeks ago I heard the calls of one or two individuals. As the temperatures warmed further, the calls of the chorus frogs should have been incredibly loud, but not so. One or two individuals was all I ever heard. Last week the final nail in the coffin was delivered to this field as a farm drainage company arrived and tiled the field to drain the land, making it suitable for the planting of crops.

No longer will I hear or photograph the seven species of frogs that would breed in these ponds, or the snapping turtle that would come to gorge on the frog’s eggs. No longer will I see the chimney crayfish that would rise from beneath the ground on wet nights, or the bizarre insect larvae that depend on such habitats, and the fairy shrimps will no longer dance through their watery world.

This field had been laying fallow since 1975, but was always zoned for agriculture. I honestly feel that all agricultural lands that are left unattended to for such lengthy periods of time should undergo environmental assessments prior to turning the soil for agricultural purposes again.

Amphibians are the most threatened species on Earth, mostly due to habitat destruction, global warming, and the deadly chytrid fungus. We are responsible for each and every one of these that affect the world’s amphibian population.

Below you will see a selection of photos showing the tile drainage being buried. The field is so wet and soggy that a backhoe was need to pull the tile plow through the muck and frequently it looked as though the backhoe would flip into the soft muck of the field. In the first image below you will see the before and after versions of my favorite pond. The before image was photographed in the spring of 2012 and the after image was taken last night. In both images if you look on the left side you will see the abandoned barn. In the before image the barn is hidden slightly by the tree-line.

Please click on the images to see the larger, sharper versions.

Before and After Frog Pond

Before and After

Habitat Destruction_7167

Backhoe tipping into pond while pulling tile plow through

Habitat Destruction_7125

Tractor driving through pond with weeping tile spool

Habitat Destruction_7209

View of the pond from the road after tiling – the level has dropped significantly

Habitat Destruction_7134

Draining Away

Green Frog_9446

Goodbye

Read Full Post »

 

Green Frog (male)

The two images of the male Green Frog (Rana clamitans) may very well be the last frogs I will photograph in the vernal ponds behind my home. As followers of this blog know my home backs onto an abandoned cattle pasture which has several low lying areas that fill with rain water and snow melt, thus creating vernal ponds. These ponds are temporary and dry out by the end of summer, but they do hold water long enough for numerous species of frogs and toads to reproduce. According to my dear, elderly neighbors that arrived in Canada, from Germany many, many years ago after the war, the field has been laying fallow since about 1975. This 40 acre plot of abandoned agricultural land is used by many ground nesting songbirds such as Bobolink, Meadowlark, Horned Lark and Upland Sandpipers. Deep in the ground Chimney Crayfish await the rains to emerge and breed in the vernal ponds. Hawks, Owls, Fox , and Coyote hunt the Meadow Voles that inhabit the field also. During the winter months I take my daughter skating on the frozen pond. Most importantly though are the vast numbers of frogs and toads that arrive at the vernal ponds each spring to reproduce – a sight and sound to behold. Having sat in the ponds among the frogs and toads during peak chorus, I can honestly state that they are louder than any RAMONES concert I ever attended :) A truly remarkable experience, but…

Green Frog and Water Scorpion

It is with great sorrow that today I report on October the 18th this has been wiped out. The field was recently sold to a farmer that has cut down every tree that lined the field to open up more fields and has since tilled the soil for the planting of crops. This of course will mean more fertilizers, herbicides and pesticides. I have always believed that this little corner of nature, located in Simcoe County, would one day be wiped out for either agriculture (it has always been zoned for agriculture) or housing developments, but I do wish I did not have to witness its destruction.With amphibian populations in serious decline around the globe, largely due to human impact, such loss of habitat, even on this small 40 acre plot of land, can yield a deadly blow to the local populations of frogs and toads.

I do hope that I am wrong, but I believe that in the fields behind my home, the Spring of 2013 will be the season without song. A sad, but all too familiar occurrence in the world that struck home on October 18, 2012. Below you will see the photos of how the field looks today.

In the photo above you are looking out over the field where each spring the largest vernal pond is to be found.

In the above photograph you are looking back toward my home, and again, across the field where additional ponds are found each spring. My home can be found immediately behind the trees on the right side of the image.

Read Full Post »

This past spring was a quiet one and that I find quite disturbing. Behind my home lies about 40 acres of abandoned cattle pasture. This is traditionally a wet meadow with numerous vernal ponds resulting from the melting snow. I have lived here for 13 years and every spring we are serenaded to sleep by frogs and toads during the spring chorus. This year was an exception.

Normally, around my home, the frogs emerge from hibernation in the following order: chorus frogs, wood frogs, spring peepers, toads with leopard frogs, green frogs and gray’s treefrogs to follow. This spring began like any other – the chorus frogs were singing their hearts out by the end of March. The wood frogs and spring peepers followed, but as conditions warmed further where were the toads. Perhaps they would not arrive at the ponds until the first warm rainy night. Warm rainy nights came and went, but no toads. The toads never arrived this spring to chorus in any of the ponds within this field. The leopard frogs and green frogs did arrive, but only two gray’s treefrogs were heard chorusing on one occasion. I find this to be disturbing and puzzling. It is puzzling because during my forays to the ponds I could hear toads and gray’s treefrogs chorusing in distant ponds, but why not in these ponds? What happened? Where were they? I have no answers to these questions. Only more questions. I wonder if it is the first sign a frog populations in decline near my home.

All around the world frog populations and other amphibians too are in decline. Amphibians are considered to beĀ  “indicator species.” When their numbers are decreasing it indicates that there is something drastically wrong with their environment – a sign of biodiversity disaster.

Amphibians have been around for some 250 million years and survived when dinosaurs did not, but will they survive the impact of humans. We continue to destroy habitat. Wetlands are filled in and paved over all in the name of “progress.” In Southern Ontario, over 80% of original wetlands have been lost due to human development. Moreover, dryer summers as a result of global warming will mean there is a greater chance of vernal ponds drying out before amphibian larvae are able to complete their metamorphosis into adults. It would only take one or two such occurrences to have a drastic effect on local amphibian populations.

Declining amphibian populations is something that we should all take seriously. It is a warning sign!

Below is a selection of images to celebrate these amazing critters. Many of these images are older ones, captured on slide film with a Minolta X700, macro lens, and a cheap $5 Vivtar flash (purchased from a scrap bin at a Toronto camera store) mounted on a homemade flash bracket. The last two images are recent digital captures.

Hope you like the photographs.

Read Full Post »

Follow

Get every new post delivered to your Inbox.

Join 636 other followers

%d bloggers like this: