Ecologists are scientists and they're always testing, observing, testing more, coming up with hypotheses, theories and scientific models. And most of the time they don't know what they're looking for or what they’ll find.
Welcome to the uncertainty principle -- and to working.
The working-stiff stress of an ecologist doesn’t hit the Olympian heights of stress like, say, being an air traffic controller or a futures trader or the president of Russia.
Don’t worry too much about losing sleep to stress, unless you’re trying to get black-footed ferrets to mate.