After read the novel "And The Waters Turned to Blood", I can describe how JoAnne became a limnolgist. Limnologist is the scientific study of the life and phenomena of fresh water, especially lakes and ponds.
The first reason is her childhood experience. She was raised well by her father who had all but grown up in the woods, hunting, fishing, and also trapping. He taught JoAnne about a lot of things about live in the open air and made her love it. So, from the very beginning, JoAnne had already love to live in the open air, observing water, animals, and a lot of other thing at the forest.
The second reason is her experience as a junior in high school. The concept that every lake had its own natural life cycle, beginning as a cold, clean body of water that supported a variety of healthy plant and animal life, and moving through stages toward becoming a shallow, warm marsh that hosted only the lowest forms of life was really captured her interest. By that, she decided that she was going to be involved in "water science".
The third reason is her proffesor support and recommendation. Actually, she couldn't go to get the higher education because financial problem. She worked at a drugstore until someday she was hired as an assistant in a limnology research at Iowa state. She showed that she could hike in the woods, ford streams, and camp with the best group of other scientist there. At the end, her limnology professor recommended her to North Carolina State. By his support, JoAnne flew to North Carolina and started her career as a limnologist.