Lagrangian portrayal of 2-D marine larval dispersal parts.

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Karen Pehrson Edwards, Jon Hare, Cisco Werner, Harvey Seim ... 1D dispersal portion - Passive, Mean Flow-Diffusion. A dispersal bend, or dispersal portion (likelihood ...
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Lagrangian portrayal of 2-D marine larval dispersal bits Karen Pehrson Edwards, Jon Hare, Cisco Werner, Harvey Seim Ocean Sciences, Feb. 2006

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Outline Background: Dispersal Kernels Model Region: The South Atlantic Bight Methods: Lagrangian Particle Tracking Results: Quantifying the dispersal bits Next strides Provided by Harvey Walsh, NOAA Beaufort

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1D dispersal piece - Passive, Mean Flow-Diffusion Dispersal Kernels A dispersal bend, or dispersal bit (likelihood thickness work), the likelihood that a hatchling will settle at a given separation from its discharge area. Cowen et al. (2002) Factors influencing dispersal include: Physical variables: Advection & dissemination Intermittent/rambling occasions, interannual inconstancy, long haul adjustments Biological elements: Spawning time & area Larval conduct Along-direction mortality Larval condition and the capacity to react to signals for appropriate living space. Cowen et al. (2002), Mora & Sale (2002) Provided by Harvey Walsh, NOAA Beaufort

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Understanding larval dispersal gives imperative data about: Population availability Population industriousness or manageability Effectiveness and plan of administration procedures, for example, MPAs Cowen et al, 2002

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Question: what is the relative significance of the accompanying variables on larval dispersal and populace network? time of discharge, area of discharge, larval length, larval conduct, and larval scattering Focusing on a contextual analysis in the South Atlantic Bight

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Cape Hatteras NC SC GA Cape Canaveral FL The South Atlantic Bight Gulf Stream

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The South Atlantic Bight Inner Shelf (<15-20m): River overflow Atmospheric fluxes and tides Mid-Shelf (20-40m): Winds Tides and Gulf Stream Outer-Shelf (>40m): Gulf Stream et al. 1991

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Methods: Lagrangian Particle Tracking Model 3D long haul month to month mean dissemination fields (Blanton et al., 2003) Plus the M 2 tide and turbulent arbitrary kick (giving larval scattering). 300 particles discharged in every model run.

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Results: GRNMS Dispersal Monthly discharges Mid-profundity discharges 30d latent Principal Component Analysis (PCA) characterizes the dispersal portion.

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Monthly Mean Dispersal from GRNMS

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Using MANOVA (1620 model runs) evaluate the relative significance:

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Larval Behavior Resulting mean dispersal for every conduct: Simple Model Behaviors

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Larval Behavior Dispersal for particles discharged at 60m isobath: Mid-profundity Shallow Deep

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Physics Tracks of vagabonds discharged at GRNMS Model 2002-2004 to take a gander at interannual changeability

Slide 15 Adult Black Sea Bass Species Occurrence Hare et al., 1999 MARMAP review Modeling particular species

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Dispersal in the SAB Dominant variables: Time and Location of Release with solid occasional tweak Behavioral Implications Adult conduct (bringing forth time & area): most imperative consider measuring dispersal with generating in (obviously) retentive inward to mid-rack Larval conduct: littler impacts potentially because of Weak vertical structure on internal retire Long-term (normal) stream fields don\'t represent transient components.

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