Department of Fisheries Oceanography Seminar - Dr. Changsheng Chen
When: Wednesday,
February 17, 2021
2:30 PM
-
3:30 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Fisheries Oceanography
Seminar Announcement
"Impact of Larval Behaviors on Dispersal and Connectivity of Sea Scallop Larvae over the Northeast U.S. Shelf"
Dr. Changsheng Chen
Department of Fisheries Oceanography
School for Marine Science and Technology
University of Massachusetts Dartmouth
Contributors: Liuzhi Zhao, Scott Gallager, Rubao Ji, Pingguo He, Cabell Davis, Robert C. Beardsley, Deborah Hart, Wendy C. Gentlemen, Lu Wang, Siqi Li, Huichan Lin, Kevin Stokesbury, David Bethoney
Wednesday, February 17, 2021
2:30 pm to 3:30 pm
via Zoom
Abstract:
Sea scallops (Placopecten magellanicus) are a highly fecund species that supports one of the most commercially valuable fisheries in the northeast U.S. continental shelf region. Scallop landings exhibit significant interannual variability, with abundances widely varied due to a combination of anthropogenic and natural factors. By coupling a pelagic-stage Individual-Based scallop population dynamics Model (hereafter referred to as Scallop-IBM) with the Northeast Coastal Ocean Forecast System (NECOFS) and considering the persistent aggregations over Georges Bank
(GB)/Great South Channel (GSC) as source beds, we have examined the dispersion and settlement of scallop larvae over the period 1978-2016. The results demonstrated that the significant interannual variability of larval dispersal was driven by biophysical interactions associated with scallop larval swimming behaviors in their early stages. The duration, frequency, and stimulus of larvae vertical migration in the ocean mixed layer (OML) increased the residence time of larvae in the water column over GB. It thus sustained the persistent aggregations of scallops in the GB/GSC and Southern New England region. The larval transport to the Middle Atlantic Bight (MAB) was closely related to the intensity and duration of northeasterly wind in autumn. There was no activated connectivity of scallop larvae between GB/GSC and MAB in the past 39 years except in the autumn of 2009. In 2009, the significant larval transport to the MAB was produced by unusually strongly northeasterly winds. Ignoring larval behavior in the OML could overestimate the scallop population’s connectivity between GB and the MAB and thus provide an unrealistic prediction of scallop larval recruitments in the region.
************************************************************************************
Zoom Link: https://umassd.zoom.us/j/93401753807?pwd=MHJVMkFDV3RQUFZhQS9lNEdTNWJlUT09
Meeting ID: 934 0175 3807
Passcode: 464610
+1 646 876 9923 US
************************************************************************************
For additional information, please contact Sue Silva at s1silva@umassd.edu
Department of Fisheries Oceanography
Seminar Announcement
"Impact of Larval Behaviors on Dispersal and Connectivity of Sea Scallop Larvae over the Northeast U.S. Shelf"
Dr. Changsheng Chen
Department of Fisheries Oceanography
School for Marine Science and Technology
University of Massachusetts Dartmouth
Contributors: Liuzhi Zhao, Scott Gallager, Rubao Ji, Pingguo He, Cabell Davis, Robert C. Beardsley, Deborah Hart, Wendy C. Gentlemen, Lu Wang, Siqi Li, Huichan Lin, Kevin Stokesbury, David Bethoney
Wednesday, February 17, 2021
2:30 pm to 3:30 pm
via Zoom
Abstract:
Sea scallops (Placopecten magellanicus) are a highly fecund species that supports one of the most commercially valuable fisheries in the northeast U.S. continental shelf region. Scallop landings exhibit significant interannual variability, with abundances widely varied due to a combination of anthropogenic and natural factors. By coupling a pelagic-stage Individual-Based scallop population dynamics Model (hereafter referred to as Scallop-IBM) with the Northeast Coastal Ocean Forecast System (NECOFS) and considering the persistent aggregations over Georges Bank
(GB)/Great South Channel (GSC) as source beds, we have examined the dispersion and settlement of scallop larvae over the period 1978-2016. The results demonstrated that the significant interannual variability of larval dispersal was driven by biophysical interactions associated with scallop larval swimming behaviors in their early stages. The duration, frequency, and stimulus of larvae vertical migration in the ocean mixed layer (OML) increased the residence time of larvae in the water column over GB. It thus sustained the persistent aggregations of scallops in the GB/GSC and Southern New England region. The larval transport to the Middle Atlantic Bight (MAB) was closely related to the intensity and duration of northeasterly wind in autumn. There was no activated connectivity of scallop larvae between GB/GSC and MAB in the past 39 years except in the autumn of 2009. In 2009, the significant larval transport to the MAB was produced by unusually strongly northeasterly winds. Ignoring larval behavior in the OML could overestimate the scallop population’s connectivity between GB and the MAB and thus provide an unrealistic prediction of scallop larval recruitments in the region.
************************************************************************************
Zoom Link: https://umassd.zoom.us/j/93401753807?pwd=MHJVMkFDV3RQUFZhQS9lNEdTNWJlUT09
Meeting ID: 934 0175 3807
Passcode: 464610
+1 646 876 9923 US
************************************************************************************
For additional information, please contact Sue Silva at s1silva@umassd.edu
Contact: > See Description for contact information
Topical Areas: School for Marine Sciences and Technology, SMAST Seminar Series