Vernal Pools: Getting My Feet Wet

“Getting my feet wet,” as an idiom, means just starting something new or gaining initial experience. This is a good expression to describe me this year as I am beginning to learn about life in vernal pools in Eliza Howell Park.

In this case, “getting my feet wet” can also be taken literally – or could be if it were not for rubber boots.

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Vernal (spring) pools are shallow temporary pools that typically fill with water in early spring and dry up by summer or fall. Several species of animals rely upon vernal pools for survival, such as wood frogs, spotted salamanders, and fairy shrimp. Because vernal pools dry up, fish do not survive there and frog and salamander eggs will not be eaten by fish.

There are 3 or 4 different spring watery spots in EHP that might be considered vernal pools. For my beginning study, I am focusing my attention on one. This is the largest one, in the heart of the wooded area.

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The approximate location of the pool, with no claim to be accurate in size, is marked in red on the map here.

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The pool in late March is some 80-90 yards long and averages about 20-25 yards wide, with water several inches to a foot deep in most of it. It is deep enough to attract Wood Ducks and Mallards at this time of the year. This particular pool, if I recall correctly from other years, does not usually dry up until at least the end of August.

Here is another view, taken while standing in the pool.

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Vernal pools are important habitats for amphibians and for invertebrates and I am hoping to learn something of the life in this pool in EHP. Fortunately, I know where to look for expert tutoring and advice. Yu Man Lee is Wildlife Ecologist and Herpetologist for Michigan Natural Features Inventory (a program of MSU Extension). She, accompanied by her husband Jon, came to Eliza Howell Park earlier in March to check out the vernal pools here.

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My new venture will involve a lot of looking down in the water, looking for/at “critters” and eggs and plants. The bottom of the pool is now covered with last year’s fallen leaves, deposited after the water died up in 2017.

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It is possible that I may want to post an update on what I am finding in this vernal pool in 2018. On the other hand, since I am just getting my feet wet, I may very well have too little to report.

 

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