Fig. 3. Oxygen consumption rates (solid circles) for R. marmoratus
measured for 1 h intervals over a 6 h period (Series III). The white bar above
the graph indicates constant light. Values are expressed as means + s.e.m.
(N=12). Columns labeled with different lowercase letters are
significantly different (P<0.05). Jurea (grey
bars) for R. marmoratus measured for 1 h intervals over a 6 h period
(Series IV). Values are expressed as means + s.e.m. (N=8). Columns
labeled with different uppercase letters are significantly different
(P<0.05).