Circulation in Pamlico Sound and Predicted Oyster Larval Dispersal and Connectivity

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dc.contributor.advisor Ping-Tung Shaw, Committee Member en_US
dc.contributor.advisor Ruoying He, Committee Member en_US
dc.contributor.advisor David Eggleston, Committee Chair en_US
dc.contributor.advisor Rick Luettich, Committee Member en_US Haase, Amy Tresa en_US 2010-04-02T18:06:27Z 2010-04-02T18:06:27Z 2009-12-22 en_US
dc.identifier.other etd-12072009-075407 en_US
dc.description.abstract A critical component to understanding connectivity of spatially-separated populations of marine organisms is quantifying hydrodynamic paths of dispersal, and variation in the strength of these hydrodynamic connections. We mimicked larval dispersal of the Eastern oyster (Crassostrea virginica) by replicating wind-driven circulation patterns in Pamlico Sound (PS), NC using a numerical hydrodynamic model (ADCIRC, ADvanced CIRCulation) to produce 3-dimensional flow-fields, followed by predicted trajectories of virtual larvae using a particle-tracking model (PTM). Predicted larval trajectories were then used to estimate a larval connectivity matrix for PS to help guide oyster restoration efforts via a network of no-take oyster broodstock reserves. To force the ADCIRC model, we used wind observations during the time that oyster larvae would have been dispersing in PS, and used velocity observations from two bottom-mounted ADCP (Acoustic Doppler Current Profiler) instruments to validate velocities predicted from ADCIRC. Field observations of trajectories from 12 Pacific Gyre surface drift buoys released during the summer of 2007 were used to validate the paths of virtual larvae produced by the PTM. The 3D ADCIRC model reliably predicted variation in velocities at different locations in PS, especially currents near-surface. The PTM also reliably simulated trajectories of surface drift buoys under varying wind regimes, thereby providing confidence in qualitative predictions of dispersal of virtual larvae, and potential larval connectivity in PS. Potential oyster larval connectivity was not uniform among broodstock sanctuaries in PS, ranging from 20 to 65% connectivity from a given sanctuary. Moreover, potential self-recruitment to a given broodstock sanctuary also varied spatially. Thus, when spatial variation in the degree of potential oyster larval connectivity in PS identified in this study is combined with the results of related studies on spatial dynamics of oyster populations in PS (see below), there is strong evidence for an oyster metapopulation and possibly source versus sink population within PS. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Pamlico Sound en_US
dc.subject connectivity en_US
dc.subject larval dispersal en_US
dc.subject ADCIRC en_US
dc.subject drifters en_US
dc.subject ADCPs en_US
dc.subject circulation en_US
dc.subject oyster en_US
dc.title Circulation in Pamlico Sound and Predicted Oyster Larval Dispersal and Connectivity en_US MS en_US thesis en_US Marine, Earth and Atmospheric Sciences en_US

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