138 



Fishery Bulletin 97(1), 1999 



35"N 



A diff.=100m2/sec, 180 days 



35'N 



30-N 



25'N 



20"N 



15'N 



% of total 

 >0-0.05 



° 0.05  0.25 



I o 0.25-0.5 



10"n| O 0.5-1 



O >i 



30'N 



25"N 



20'N 



15"N 



10"N 



165"E 170"E 175"E 180" 175'W 170'W 165'W 160"W 155"W 150W 145"W 



35"N 



B diff.=100m2/sec, 365 days 



35"N 



30'N 



25"N 



20'N 



15*N 



10'N 



% of total 

  > - 0.05 



- 0.05 - 0.25 



o 0.25-0.5 



O 0.5-1 



•.. -■(*:„, ., 





30'N 



25'N 



20'N 



15"N 



10'N 



O >1 



165'E 170'E 175'E 180' 175'W 170'W 165'W 160'W 155'W 150'W 145'W 



Figure 6 



Simulated spatial distribution of .5000 larvae (A) 180 and iB) 360 days after release 

 on 1 July 995 at Maro with an eddy diffusion rate of 100 ni-/sec. Solid circles denote 

 Oahu, Necker, and Midway Islands, and the star marks Maro Island. 



which the topography drops steeply to midocean 

 depths. For Necker, Maro, and Oahu, the radius of 

 the 200-m isobath is about 70 km. Oceanographic 

 features resulting from interactions with topography 

 that larvae might detect will certainly extend some 

 distance beyond the 200-m isobath, perhaps a dis- 

 tance equal to the radius of the bank. Thus, as an 

 index of larval recruitment to a bank, we assumed 

 that larvae that were within 140 km of a bank 365 

 days after release would recruit to that bank. The 

 choice of 140 km was somewhat arbitrary but be- 

 cause we used the index as a relative and not abso- 



lute index, the results were not particularly sensi- 

 tive to this distance. 



Results 



Simulations were performed to describe the lai-val spa- 

 tial dynamics from 5000 lai-vae released from all four 

 banks for the 4-month summer spawning season ( May- 

 August) and the 2-month winter spawning season (No- 

 vember and December). The results indicated that there 

 are spatially distinct patterns that generally persist 



