1. mouth and limnetic, littoral, weathered continental drift bed and flood deposit facies. ...

2. Alewife piscivority appeared to be at least partially nocturnal and was more prominent in littoral than in limnetic areas.

3. The use of Backcrosses is ideal because a comparison of their growth rates in the two habitats estimates an ecologically dependent component of their fitness while controlling for any intrinsic genetic incompatibilities that may exist between the Benthic and Limnetic genomes