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Abundance and Distributional Variation of Dragonflies in a Forest in Response to Hydrology and Daily Ambient Temperatures.
This research concerns the dragonflies communities found at Kanahawa State Forest, in Charleston, West Virginia. The aim of the research is to determine where - and at what time of day - the dragonflies in this forest are most abundant. To this end, the number of dragonflies occurring at two study sites were recorded, for six weeks, from September 12th to October 31st.
Throughout the study, the following expectations were held: it was expected that the dragonflies would be more abundant in areas with more standing water, and that there would be more occurrences of dragonflies at midday when the temperatures were higher.
The hypotheses to be tested in this study are therefore:
That dragonflies are more abundant (i.e., there are more individuals of each species, and there are also more species) in areas with standing water, and That dragonflies, in general, will be more...
A stream runs through the area, over which hang trees, which provide some shade. The two sites are a mile apart.
Methodology
The number of dragonflies, and the species of each dragonfly recorded, were observed at the two study sites, and were recorded. These assessments of dragonfly abundance were taken at certain time intervals throughout the day, over a six-week period, at 0800, 1200 and 1700.
Species Recorded at the Study Site
Five species of dragonfly were recorded from the sites, the Eastern Grayback (of the genus Tachopteryx); the Spotted Biddie (of the genus Cordulegaster); the 10-Spot (of the genus Celithemis); the Widow (of the genus Erythemis), and the White Tail (of the genus…
Bibliography
Bechly, G. "Phylogenetic Systematics of Odonata. http://member.tripod.de/GBechly/phyosys.html (10th October 2003).
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Gerholdt E. James. Dragonflies. Minnesota: Abdo and Daughters, 1996.
Losito, Linda. Damselflies and Dragonflies. New york: The Bookwright Press, 1997.
Mauffray, Bill. "Dragonflies and Damselflies. http://www.afn.org/~iorr/(10th October 2003)
Paulson, D. "Dragonfly (Odonata) Biodiversity. http://www.ups.edu/biollgy/museum/UPSdragonflies.html (10th October 2003).
Venable, J. Dragonflies: an Introduction to the Dragonflies and Damselflies of West Virginia. http://www.wvu.edu/~agexten/wildlife/801.pdf (10th October 2003).
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