Migratory population

Brook trout [Salvdimsfontinalis] have both migratory (anadromous) and non-anadromous populations. Fish from each type were tested for their responses to home-stream water. Both preferred home stream over control water but were equally attracted to water from their home-stream and from an unfamiliar stream. Therefore, specific local odors may not be critical cues. Furthermore, anosmic fish made the same choices, indicating that taste may be involved. In the non-migratory population, responses to home-stream water were noted only in summer, not in winter (Keefe and Winn, 1991). 

Fig. 2. Neural Crest Derivatives. The neural crest is a pluripotent migratory population derived from the dorsal neural tube that gives rise to an extraordinary number of diverse cell and tissue types. (See Color Insert.)...

Thus the earlier failure to observe migratory preference with p-substituted phenyl groups in triarylmethylazides results from the fact that the presence of the p-substituent would have no influence on the ground state conformation of the azides. In support of this hypothesis is the observation that the decomposition and rearrangement of (27) becomes increasingly statistical as the temperature is raised (higher energy conformations become more populated) ... 

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