PUBLIC TALK: ENVS THESIS DEFENSE: Weds, 10/19 1:30PM Emily Moffitt: Using Stable Isotope Analysis to Infer Breeding Latitude and Migratory Timing of Juvenile Pacific-slope Flycatchers (Empidonax difficilis) WSQ 111

[Rachel O'Malley]

PLEASE FORWARD, ANNOUNCE, AND POST:

The Department of Environmental Studies at San José State University

pleased to present a public research presentation:

 

Wednesday, October 19, 2016 1:30 PM – 2:45 PM WASHINGTON SQUARE HALL 111

Emily Moffitt M.S. Candidate  Environmental Studies Department San José State University

                                                                                                   

Using Stable Isotope Analysis to Infer Breeding Latitude and Migratory Timing of Juvenile Pacific-slope Flycatchers (Empidonax difficilis)

 

Effective conservation of migratory species is hindered by a lack of knowledge of population links between breeding, wintering and stopover habitats. The pacific-slope flycatcher (Empidonax difficilis) is one of the many Neotropical migratory songbirds whose populations are steadily declining throughout western North America. This research contributed to the assessment of migratory connectivity in this species by inferring relative breeding origins and habitat selection of juvenile birds that migrate along the pacific flyway to the South San Francisco Bay area in the fall. Data collected from July 20 to October 12, 2014 were analyzed for three stable isotopes (δ²H, δ¹³C, δ¹⁵N). Findings revealed that populations migrated sequentially from western regions throughout expected breeding latitudes, with early season migrants most likely coming from the more southern, warmer and dryer regions of northern California, Oregon, and southern Washington while late season migrants had probable origins in the more northern, cooler, and wetter regions of northern Washington and southern British Columbia. This study provided new information on the annual cycle and migratory timing of pacific-slope flycatchers, and lays the foundation for future assessments of migratory connectivity of this species.

 

LIGHT REFRESHMENTS PROVIDED.  ALL ARE WELCOME.

 

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