Daphnia Proposal draft 2

Daphnia Proposal draft 2 - Daphnia Feeding Response in an...

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Daphnia Feeding Response in an Acidified Environment Spencer Callaghan Pinal Patel Amber Reeves Introduction: Daphnia belong to the Cladocerans group. The group Cladocerans consists of small crustaceans that dwell mostly in freshwater lakes, rivers and streams (U.S. Geological Society, 2011). Daphnia are also commonly known as water fleas because their “hopping”, jerky form of locomotion closely resembles that of Ctenocephalides canis , the common, parasitic flea afflicting household pets. Their body is covered in a carapace that is segmented and transparent in most species. Through this “shell”, their internal structure can be viewed and their digestion and circulatory mechanisms observed. Daphnia are mostly found in the benthos range of their habitats but can also found suspended within the water column. They are free swimmers; they use a pair of antennas to swim through the water with that characteristic jumpy motion. They are also filter feeders that use a filtration system to collect and concentrate small particles of food from a relatively large volume of water. They feed on phytoplankton organisms such as volvox, bacteria, and yeast. Daphnia itself is food for hydra and fishes (USGS, 2011). The U.S. Environmental Protection Agency considers Daphnia to be an indicator species for their ecosystems (2011). In other words, these organisms can serve as an early warning system in terms of pollution and help us to assess the quality of the environment. This means that the more we know about this organism the better we can predict the general health of a
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particular environment. Daphnia are part of the food chain in their ecosystem, and their success rate directly correlates to the success of other species within that community. Many aquatic organisms can be sensitive to even subtle changes in their environment especially in terms of changes in acidity and Daphnia are no exception ( Davis P., Ozburn G.W).
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This note was uploaded on 08/10/2011 for the course BIOL 1108L taught by Professor Stanger-hall during the Spring '09 term at UGA.

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Daphnia Proposal draft 2 - Daphnia Feeding Response in an...

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