Week 4 Observations

In my week four observations, I recognized some familiar organisms that I had seen in the previous weeks. However, some things yet again had changed after a week. The movement in week 3 was very active, but in week four there appeared to be much less movement. This could be a result of organisms feeding on others or some might have just died. The philodina appeared to be back at work this week, however instead of feeding on other organisms it appeared to be feeding off of the food source. One thing that really surprised me this week was that there appeared to be no seed shrimp moving. In the previous weeks it had been very easy to spot the seed shrimp. There were still many of the unicellular tiny organisms around the food source, but they appeared to be fewer in number. I am very curious to see the next weeks observations to see if there is a trend in the inactivity in the aquarium.

Thorp JH, Covich AP. 1991. Ecology and Classification of North American Freshwater Invertebrates. San Diego, California: Academic Press Inc. 300 p. (Figure on page 234)