But we got this other organism...organism #3, and after graphing it, we had a lot of concerns. We immediately couldn't call it a predator or a prey to the trout since it seems to break some "rules" we established about what happens to each type of population in terms of increasing/decreasing.
The most astounding part was what happened between 1930-1945. For one thing, it didn't exist in 1930--it's total population was ZERO! We had a lengthy discussion about what this means (extinct versus new species?!?!?!) and clarified that organisms of different species couldn't mate with one another, and that if an organism is extinct it can't come back. We certainly had lots of wonderings!
So we're off to do two things. We're going to use a US government map to see what the Great Lakes connect to (via satellite imagery) and research what could have happened historically in the Great Lakes during this unique time period.