Showing posts with label Rana sylvatica. Show all posts
Showing posts with label Rana sylvatica. Show all posts

Friday, March 16, 2012

Frogs at Clark Wright Day 2

Day two exploring the vernal ponds was incredible.  The frogs were calling so loudly that both my ears were ringing when I left.  Jake and I stood in the pond shouting to each other over the chorus.  The frogs never quieted or stop calling.  They were focused!
Spring Peeper, Pseudacris crucifer

 Spring Peeper

According to Wikipedia:

On Martha's Vineyard, peepers are commonly called "pinkletinks"; in New Brunswick, Canada, they are sometimes called "tinkletoes", although not commonly known by that name, and usually referred to as simply "peepers". On Nova Scotia's South Shore, they are sometimes referred to as "pink-winks." These frogs are one of the smallest known frogs.

It was hard to find this fella.  He called and called while I stood there thinking that I had to be looking at him.  Finally I found the frog at the centre of a little grass teepee.  It is hard to judge scale from the photo. This one was about 1 - 1.5 cm.

Wood Frog 

Wood Frog, Rana sylvatica
According to the Toronto Zoo Adopt-a-Pond web page: "Wood frogs spend the winter FROZEN with 65% of the water in their body becoming ice! Canadian researchers have discovered that the Wood frog's breathing and heartbeat, actually STOP as winter approaches. Wood frogs freeze from the inside OUT because if they were to freeze from the outside IN, the pressure from the outside would crush their internal organs. The ability to freeze is possible due to high concentrations of glucose (or sugars), which prevent cells from completely freezing. Specialized proteins in the Wood frog's blood allows them to control the rate at which they freeze and prevents their blood from clotting. Wood frogs are still susceptible to freezing involuntarily. They lose their freeze tolerance shortly after they emerge from hibernation in the spring because their glucose levels and specialised protein levels (which enable them to freeze) are very low. The production of the glucose and proteins are triggered by seasonal phenomena so that once winter arrives, again, the Wood frog will be able to freeze."




Colour variation in Wood Frog - there were many today that appeared reddish.

This frog was not concern about me being there.  In this picture he's looking the other way - possibly for a mate.

Wood frogs have an odd way of hanging around. Many float on the surface in a relaxed fashion as in the picture above and below.

Floating

From underneath - fore legs on the left.



Face to face

Thursday, March 15, 2012

Brake for Frogs


Watch for frogs on roads over the next couple days.  Drive slowly!!!! After photographing and appreciating the beauty of the frogs pictured below at Clark Wright CA, I decided to try "road cruising" or driving slowly near bridges around natural areas looking for frogs. I've never done it before at night and never specifically for frogs.  From what I read the conditions tonight seemed ideal.

It was gruesome.  I wish I hadn't gone.  There were many dead bodies and even worse there were injured and suffering frogs all over the road.   I tried to leave.  As I was driving (very slowly) away I saw a tiny frog at the last second I swerved and it hopped. Then "pop".  Ugh. This is the second animal I hit that I know of (both within a year ) I felt terrible about the grackle I hit too.  I gathered the bird up and put on my lap hoping I could help it somehow. I couldn't.  Keep your eyes open over the next couple days during the peak breeding time. 


Northern Leopard Frog, Rana pipiens


Wood Frog, Rana sylvatica