TEMPORAL PATTERNS OF ZOOPLANKTON MIGRATION 



600- 



a: soo 



> 



a 



z 



* 300 



Legend 



A TOTAL 



• LESS OITHONA 



pV/ZAV^iV/^AV^ 



TIME 



Figure l.--The number of individuals captured per hour during the different 



time intervals are plotted, both with and without the copepod Oithona colcarva . 

 Samples from 2030 on July 16 have not been counted. Refer to table 1 for the 

 means, medians, and standard deviations. Note that units of time along the x 

 axis are unequal . 



results from 148 samples from mesh emergence traps from 2 days (July 16-17) 

 will be presented herein. During the collection period sunrise was at 0600, 

 sunset at 1800, and the lunar phase was new moon. 



RESULTS 



Effects of Traps and Substrata 



No signi 

 (ST) tests] i 

 mesh traps wi 

 no significan 

 hour occurred 

 or rubble. F 

 traps located 

 traps tended 

 between types 

 are from mesh 



ficant differences [p < 0.05; Mann Whitney U (MWU), Students' T 

 n the number of individuals captured per hour were observed between 

 th sealed vs. unsealed bottoms over coral substrata. Additionally, 

 t differences (p _< 0.05) in the number of individuals captured per 



between traps positioned over sand vs. those positioned over coral 

 or all subsequent tests, data from sealed and unsealed traps and 



over sand and over coral or rubble were pooled. The polyvinyl 

 to capture more zooplankton than mesh traps. Although the difference 



of trap was not significant, most of the data presented herein 



traps only. 



120 



