Northwest Atlantic Mackerel (Scomber scombrus) Population Structure Evaluated using Otolith Stable Isotopes

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dc.contributor.advisorSecor, David Hen_US
dc.contributor.authorRedding, Stephen Grayen_US
dc.contributor.departmentMarine-Estuarine-Environmental Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2017-06-22T06:38:58Z
dc.date.available2017-06-22T06:38:58Z
dc.date.issued2017en_US
dc.description.abstractStock assessments for Northwest Atlantic mackerel (Scomber scombrus) assume a single stock, comprised of northern and southern contingents, each with distinct natal regions in the US and Canada. I hypothesized that otolith δ18O and δ13C values would provide discrimination between these regions based upon hydrographic differences, and such information could illuminate seasonal migrations and contingent structure. Otoliths from regions throughout the North Atlantic Ocean were carefully milled to extract carbonates corresponding to the first year of life. Significant differences occurred in otolith isotope composition across the Atlantic basin, and within the Northwest Atlantic stock, despite annual variability. In the Northwest Atlantic, two separate natal habitats and associated contingents were supported for juvenile mackerel, but incursions by the northern contingent into US waters occurred in older fish (age>2). These findings indicate that stock structure assumptions should be revisited in the assessment and management of Northwest Atlantic mackerel.en_US
dc.identifierhttps://doi.org/10.13016/M24G47
dc.identifier.urihttp://hdl.handle.net/1903/19545
dc.language.isoenen_US
dc.subject.pqcontrolledEnvironmental scienceen_US
dc.subject.pqcontrolledEcologyen_US
dc.subject.pqcontrolledBiologyen_US
dc.subject.pquncontrolledAtlantic mackerelen_US
dc.subject.pquncontrolledcontingentsen_US
dc.subject.pquncontrolledNorthwest Atlanticen_US
dc.subject.pquncontrolledotolith stable isotopesen_US
dc.subject.pquncontrolledpopulation structureen_US
dc.titleNorthwest Atlantic Mackerel (Scomber scombrus) Population Structure Evaluated using Otolith Stable Isotopesen_US
dc.typeThesisen_US

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