Larval Diel Vertical Migration of the Marine Gastropod Kelletia kelletii (Forbes, 1850)

Table 4

Comparison of experimental and control variables in day-night laboratory trials in jars in 2005 versus short columns in 2007.

Variable	2005	2007
Environment	Incubator	T-controlled walk-in incubator
Light cycle	12: 12	16: 8
Egg collection site	Monterey, CA	Palos Verdes, CA
Egg source	Single female	Multiple females
Data collection interval	6 hrs	4 hrs
Dark phase starting time	1700	2100
PAR range	51–144	242–298
Response factor	% demersal	ZCM
Column dimensions	8 d × 15 h cm	9.5 d × 15 h cm
Phytoplankton present	yes	no