Week 5 Observations

The amount of movement in the aquarium during my week five observations appeared to correspond with the previous weeks. There seemed to have been a pattern of less movement after the past three weeks. This week I still did not see any seed shrimp, which were the easiest organisms to spot at the beginning of my observations. There were also not as many of the unidentified unicellular organisms that were gathered in large numbers a few weeks ago. This could possibly be because the food source was pretty much gone, they may have been eaten by other organisms, or they just died off. However, there still were a pretty good amount of rotifers moving around. I even spotted some Nematodes, which I had not seen in the previous weeks. With the food source completely gone, I could only imagine within the next we weeks that the rest of these organisms would die off.

Thorp JH, Covich AP. 1991. Ecology and Classification of North American Freshwater Invertebrates. San Diego, California: Academic Press Inc. 300 p. (Figure 9.1 on page 250)