Food Webs and Chains
One thing I learned about food webs is how overlapping they are with the other food chains, even with only a little over 20 organisms, including plants and dead stuff, present.  It seems in a roundabout way, all organisms end up eating each other throughout the cycle, whether they are a primary consumer, secondary consumer, or tertiary consumer because the primary consumers eat the plants, the secondary consumers may be just carnivorous and eat the primary consumer, but they are taking energy from the plant that the primary consumer ate as well, and it's the same process when it comes to tertiary consumers eating secondary consumers.  Something that could cause a food chain/web to collapse would be an epidemic in a certain species that wipes out a population of a living thing, like a white tailed deer.  Deer may not be highly consumed by other organisms, but they are a main source for some and if they were to die off, it might lead to starvation of the other organisms throughout the community.  One thing that blows my mind is that this was just a small food web with just a few of the organisms around Presque Isle, but the food web still overlapped and was messy to put together.  I couldn't imagine how messy it could have been if we were to include every organism existing in Presque Isle.

This was what our food web looked like when we were done piecing together what the 20+ organisms ate.