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Thursday, 18 June 2009

Dragonfly's emerging at Wabatong



A dragonfly has a life span of more than a year, but littleof its life is an adult. Three stages of the dragonfly life cycle are the egg, nymph, and adult. Most of the life cycle of a dragonfly is lived out in the nymph stage and unless you go looking for them you won't see them.

A male and a female dragonfly will mate while they are flying in the air. After two dragonflies mate, the female dragonfly will lay her eggs on a plant in the water, or if she can’t find a suitable plant she will just drop them into the water.

Once the dragonfly eggs hatch, the life cycle of a dragonfly larva begins as a nymph. A nymph looks like a little alien creature. It hasn’t grown its wings yet and has what looks like a crusty hump hanging onto its back. Dragonfly nymphs live in the water while they grow and develop into dragonflies. This portion of the dragonfly life cycle can take up to four years to complete, and if the nymph cycle is completed in the beginning of the wintertime, it will remain in the water until spring when it is warm enough to come out.Dragonfly nymphs live in ponds or marshy areas because the waters are calmer than in a stream or river. Sometimes they can be found in the calmer backwaters of rivers, too. Dragonfly nymphs may eat smaller dragonfly nymphs as they develop.

Once the nymph is fully grown, and the weather is right, it will complete the metamorphosis into a dragonfly by crawling out and finding a suitable place to Metamorphicize. The nymph will shed its skin onto the stem of the plant and will then be a young dragonfly. The skin that the nymph left behind is called the exuvia and you can find the exuvia still stuck to the stem for a long time after the dragonfly has left it.Once the dragonfly leaves the exuvia it is a full grown dragonfly. The dragonfly will hunt for food and begin to look for a mate. Once the dragonfly finds a mate, the female will find a body of calm water that will be a good place to lay her eggs, and the life cycle of the dragonfly begins all over again. Adult dragonflies only live about two months.

Depending on how healthy a lake is directly coincides with the amount of dragonflies emerging. Dragonfly nymphs are gill breathers and are very sensitive to water chemistry. If the lake is polluted, usually nymphs, stoneflies, and mayflies are the first to die. If the water is healthy, more dragonflies will hatch, Wabatongushi is considered a very healthy lake.

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