Effect of Area Closures on Georges Bank Bivalves:
Larval Transport and Population Dynamics

Simulation	Images	Movies
General Information Abstract of ASLO talk. Models looking at Pathways of larval transport across Stellwagen Bank. Work addressing sources of Calanus finamrchicus for Georges Bank. FLC movie information and players.	Map of area locations.
(2/18/99) Population modelling (ASLO Results): Idealized model with following parameters: Larvae (1/adult) spawned September 1st and transported for 40 days, settling only when H<200 meters. Adults lived for a maximum of 9 years, spawning every year. Mortality (m) varied from 0 to 0.9 per year. Fishing mortality (f) ranged from 0 to 100% of mortality.	Population growth rate. (Postscript) Proportion of population in area I. (Postscript) Proportion of population in area II. (Postscript) Proportion of population in fishable regions. (Postscript)	Animation (9 MB) of a 10 year simulation; each adult spawned 1 larva/yr.. Left hand map shows mortality uniform at 50% (m=0.5, f=1) throughout the domain; right hand panel shows mortality in the closed areas reduced to 0 (m=0.5, f=0).
(2/18/99) Sources and Sinks (ASLO Results): Larvae were initiated on September 1 throughout the model domain and transported for 40 days in the top 25 meter flow. The distribution of the source and settlement regions were calculated as the percentage of the individuals at a given location that either originated from (settlement) or settled in (source) a given closed area. This can also be thought of as the probability that an adult at a given location originated from the closed area (sink map) and the probability that a larvae from a given region will settle into a given closed area (source map).	Distribution of settling larvae originating in each of Closed Areas 1 and 2. (Postscript) Source of settling larvae for each closed area. (Postscript) Source and Settlement distribution for region of particular interest within area II. (Postscript)	Animation showing path of larvae from each region.
(12/1/98) Top 25 meter Flow: Larvae spawn on September 1 and travel for 40 days, with no dispersion. Larvae in water deeper than 200 m are killed. This cycle is repeated for 10 years.	Time course of # of individuals remaining within domain. Time course of proportion of individuals remaining within domain, by area of origin.	Gzipped 9 MB flc for all 6 launches.
(12/1/98) Top 25 meter Flow: Larvae spawn on September 1 and travel for 40 days, with a 10 cm/s velocity variance. Larvae in water deeper than 200 m are killed. This cycle is repeated for 10 years.	Time course of # of individuals remaining within domain.	Gzipped 13 MB flc for all 6 launches.
(5/7/98) Depth averaged Flow: Particles are seeded within each of the regions every 60 days (simulating spawning on Jan. 1, Mar. 1, May 1, Jul. 1, Sep. 1, and Nov. 1) and allowed to diffuse (dispersal velocity variance =10 cm/s)and advect for 60 days. The particles are released in a two-dimensional flowfield consisting of the average horizontal velocity over the entire water column		Gzipped 8 MB flc for all 6 launches.
(5/7/98) Top 25 meter Flow: Particles are seeded within each of the regions every 60 days (Jan. 1, Mar. 1, May 1, Jul. 1, Sep. 1, and Nov. 1) and allowed to diffuse (dispersal velocity variance = 10 cm/s) and advect for 60 days. The particles are released in a two-dimensional flowfield consisting of the average horizontal velocity over the top 25 meters of the water column, and is thus subject to the faster surface currents as well as notable surface convergence and divergence.	Settlement locations for larvae spawned on: September 1 November 1	gzipped 8 MB flc for 6 bimonthly periods. 2.7 MB flc for Sept. 1 and Nov. 1 launches.