WAPLES and ROSENBLATT; LARVAL DRIFT IN SOUTHERN CALIFORNIA 



125 



35' 



30" 



25' 



125° 



120° 



115° 



110° 



Figure 1.— Schematic representation of mean flow patterns in the study area, based on data from 

 Wyllie (1966) and Hickey (1979) and modified from Cowen (1985). Consistent flow directions are shown 

 with soHd arrows; dashed arrows indicate more variable features. Study sites are also indicated: La 

 Jolla (L); San Nicolas (N) and Catalina (C), California Channel Islands; Isla de Guadalupe (G); Islas 

 de San Benito (B); Cabo Thurloe (T). 



northward along the Southern California Bight, 

 forming the Southern California Eddy (Schwartzlose 

 1963). This eddy can be found throughout the year 

 except during periods of peak southward flow (gen- 

 erally January to May). 



The 10 shore fish species used in the analysis 

 (Table 1) were generally those that could be collected 

 in adequate numbers during brief visits to remote 

 localities. However, attempts were made to include 

 species with widely varying life history strategies 

 and, hence, different dispersal capabilities. The life 

 history and larval capture data summarized in Table 

 1 were taken from personal observations, unpub- 

 lished data from the California Cooperative Fish- 

 eries Investigations (CalCOFI) and the Ichthyo- 



plankton Coastal and Harbor Studies (ICHS), and 

 from the literature; see Waples (1986) for discus- 

 sion and references. Sample sizes of about N = 50 

 individuals per species were collected at each of the 

 four areas [ranges of mean_sample sizes: for species, 

 iV = 36 (bjacksmith) to AT = 63 (sheephead); for 

 localities, A/" = 46 (Punta Eugenia) toN = 55 (Gua- 

 dalupe)]. 



Electrophoresis and Data Analysis 



Whole fish or tissue samples were frozen in the 

 field, transported to Scripps Institution of Ocean- 

 ography, and stored at -25°C to -35°C. Proce- 

 dures of horizontal starch gel electrophoresis and 



