FISHERY BULLETIN; VOL. 78, NO. 2 



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23-30 OCT 1975 



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TIME OF DAY (EST) 



Figure 4. — Die! changes in abundance ofCallinectes Icirvae in neuston collections in the Middle Atlantic Bight, 1975-77. Abundance 

 (dashed line) for each time interval was averaged over the stations of a cruise. The rank sum for each cruise (solid line) was calculated 

 by summing over all stations the ranks (lowest to highest) of the abundances at each time interval. (The rank sum weights the 

 frequency of occurrence at each time interval.) 



sunrise) on all cruises except fall 1976, when 

 abundance was greatest during daylight hours. 



258 



The rank sum, which weights both abundance and 

 frequency of occurrence, indicated patterns of 



