Mason Archival Repository Service

The Influence of Migratory Connectivity and Seasonal Interactions on Individual- and Population-Level Dynamics of a Long Distance Migratory Songbird

Show simple item record

dc.contributor.advisor Rockwood, Larry L.
dc.contributor.author Hallworth, Michael T.
dc.creator Hallworth, Michael T.
dc.date 2014-08
dc.date.accessioned 2014-10-14T19:58:11Z
dc.date.available 2019-08-15T06:39:31Z
dc.date.issued 2014-10-14
dc.identifier.uri https://hdl.handle.net/1920/9058
dc.description.abstract Determining the factors that influence population dynamics of migratory animals is complex in part because of the large spatial scales that these species occupy annually. The strength of migratory connectivity, the geographic link between breeding and non- breeding populations, may influence the way populations respond to selective pressures and influence how we conserve and protect such species. Furthermore, periods of the annual cycle interact and events during one period may affect subsequent stages of the life cycle. Using archival light-level geolocators I examined the degree of migratory connectivity and how carry-over effects influence individuals and the population growth rate of the Ovenbird (Seiurus aurocapilla) a long distance Neotropical migratory songbird. Ovenbirds exhibit strong migratory connectivity at broad spatial scales but connectivity within sub-populations ranged from moderate to weak. I found evidence of a strong carry-over effect during spring but no interaction resulting from breeding season events during the fall. The presence of a strong carry-over effect in the spring was mediated via departure from the non-breeding grounds. Departure timing from the non- breeding and subsequent arrival to the breeding grounds influenced reproductive parameters at the individual level. As a result, early arriving individuals added significantly to the population while late arriving individuals did not. Indeed, the population growth rate decreased by 0.028 ± 0.003 for each day arrival to the breeding grounds was delayed. Overall, my findings suggest that seasonal interactions in the form of carry-over effects play a significant role in shaping individual and population-level dynamics of a migratory songbird. These findings highlight the importance of considering the entire annual-cycle of migratory animals when attempting to determine processes that regulate or limit migratory populations.
dc.language.iso en_US en_US
dc.rights Copyright 2014 Michael T. Hallworth en_US
dc.subject Breeding ecology en_US
dc.subject Carry-over effect en_US
dc.subject Geolocator en_US
dc.subject Ovenbird en_US
dc.subject Seiurus aurocapilla en_US
dc.subject Stable hydrogen isotope en_US
dc.title The Influence of Migratory Connectivity and Seasonal Interactions on Individual- and Population-Level Dynamics of a Long Distance Migratory Songbird en_US
dc.type Dissertation en
dc.description.note This work is embargoed by the author and will not be available until August 2019. en_US
thesis.degree.name PhD in Environmental Science and Public Policy en_US
thesis.degree.level Doctoral en
thesis.degree.discipline Environmental Science and Public Policy en
thesis.degree.grantor George Mason University en


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search MARS


Browse

My Account

Statistics