EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > MIGRATORY RATES/ROUTES
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.
Feldhamer, G., L.Drickamer, S.Vessey, J.Merritt. 1999. Mammalogy: Adaptation,
Diversity, Ecology. McGraw Hill-Hill Companies, Inc.