11/09/2011
Fourth Post
When I observed my Microaquarium under the microscope, there was an even larger decrease of organisms than there was the last observation. The water from the Fountain City Duck Pond was also at a lower level than last time. Despite there being two Midge Larvae in the aquarium, there were less other organisms in the tank. all of the new organisms that were discovered last week, except the Oedogonium, ( Nematode, Philodina, and Euchlanis) have all disappeared. Many of the Seed Shrimps and Cyclops are also gone, a sparse few of them are swimming near the sediment at the bottom of the aquarium, scrounging for food. The Vorticella showed no obvious signs of decrease, despite the fact that only two clusters were found. Another discovery, crucial in the explanation of the disappearances of many of the organisms, was that there was no Halteria to be found anywhere. This, along with the fact that many of the other organisms are unable to chew the food, (instead, they just swallow it down), and that the Amblestegium sp. Moss being virtually untouched, leaves me to conclude that the Halteria was the primary food source for many of the organisms in the aquarium. And after the disappearance of the Halteria, it seemed that a few other organisms could not adapt fast enough to compensate for the disappearance of their food source.
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