ALLEN and DeMARTINI: NEARSHORE DISTRIBUTION AND ABUNDANCE OF PELAGIC FISHES 



TABLE 2. — Summary of significant chi-square values from Wilson's three-way ANOVA with un- 

 equal replication for three categories and two species of fishes present in lampara net samples, Sep- 

 tember 1979-March 1981, inclusive (*=P<0.001). Dashes indicate insignificant (P 

 <0.05) results. 



TABLE 3.— Results of Wilson's three-way ANOVA 

 without replication for four species that were com- 

 mon in lampara net samples, September 1979- 

 March 1981, inclusive. (* = P < 0.05; ** = 

 P< 0.001.) 





simillimus and atherinid spp. also formed a close 

 association (~18 , 7( distance). 



Sardo chiliensis was the most dissimilar member of 

 Group II, and linked to Scomber japonicus and T. 

 symmetricus at ~409c distance. 



The four species in Group III formed a relatively 

 tight group with a maximum dissimilarity of only 38 % 

 distance (yellowfin croaker, Umbrina roncador, to 

 the other three species). Sphyraena argentea andX 

 californiensis were most closely associated (~20% 

 distance), with deepbody anchovy, Anchoa com- 

 pressa, occupying the intermediate position. 



Group IV was composed of nine bottom-oriented 

 species which were relatively rare in the samples. 



Influences of Diel Period, 



Surface Water Temperature, and 

 Depth 



Sea surface temperature ranged from about 14.2° to 

 24.0° C during the study period. Highest water tem- 

 peratures were encountered during the summer 

 months (July-September) and lowest in winter 



(December-February) as would be expected in a tem- 

 perate marine habitat. Sampling depths ranged from 

 5 to 25 m. Day collections were made between 0700 

 and 1300 h and night collections between 1900 and 

 0100 h. 



Spearman rank correlations of 2 categories and 21 

 individual species (Table 4) with time of collection, 

 depth of water column, and sea surface temperature 

 yielded numerous significant relationships. Depth 

 (20 significant values) and time of collection (14) 

 were important factors for most categories or 

 species. Temperature was significantly correlated 

 with 10 categories or species. The total individuals 

 category was significantly correlated with all three 

 abiotic factors (negative with depth). Species counts 

 correlated only with depth (negative) and time of 

 collection. In general, both the numbers of in- 

 dividuals and numbers of species were greatest at 



TABLE 4. — Summary of Spearman's rank correlation (r s ) values and 

 significance levels for 2 categories and the 21 abundant species/ 

 taxon collected. Time = time of collection (military time); Depth = 

 bottom depth (m); Temp = surface water temperature (°C). (df = 

 210; * = P < 0.05; ** = P < 0.0001.) 



577 



