Migratory species are of increased conservation concern because of their reliance on multiple, geographically disjunct habitats. An understanding of how long-term ecological processes and contemporary population genetic patterns are related is critical for effective management and conservation of such species. Combining traditional long-term census and mark-recapture data with temporally focused molecular genetic data can help inform these efforts. We used 24 years of banding data, 15 years of migration counts, and molecular genetic data from 17 microsatellite loci to describe the migration phenology, direction, and population connectivity of Red-tailed Hawks (Buteo jamaicensis) migrating through the Marin Peninsula, California. Count data indicated two distinct peak periods of movement across years: 15 August-30 September and 1 October-30 November. Band-encounter data from these two periods revealed a significant difference in movement: individuals in the early period of migration (15 August-30 September) displayed little net movement, whereas individuals from the second period (1 October-30 November) showed directional, southward movement. Finally, molecular genetic data suggest that the early-season period primarily involves a population from central California, whereas the second period includes both individuals from central California and individuals from desert regions of the Intermountain West. These analyses provide important information for interpreting long-term Red-tailed Hawk count and banding data and offer an example of how traditional population-monitoring methods can be combined with molecular genetic markers.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 126 • No. 2