Parameter Tree:
EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > MIGRATORY RATES/ROUTES

Definition:
Migration is a persistent movement across different habitats in response
to seasonal changes in resource availability and quality. Migratory rates
and routes are observed for many migrating species. 


Reference:
Feldhamer, G., L.Drickamer, S.Vessey, J.Merritt. 1999. Mammalogy: Adaptation,
Diversity, Ecology. McGraw Hill-Hill Companies, Inc.