Mireille Consalvey PhD Thesis - University of St Andrews

Rates of change (Eden April)
1) Over the exposure period
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The rate of change in the F,, 15 yield in cores that were light and
submerged was significantly affected by time (F5,36 = 2.64, p=0.04) with the
maximum rate of increase occurring in the first hour and subsequently declining
(Figure 4.17). In cores that were light and exposed, time also had a significant
effect (F5,36 = 2.64, p=0.04) on the rate of change. In the first 3h the rate of
increase remained similar but then declined. Cores that were dark and submerged
(high tide conditions) exhibited an initial rate of change of 0.76 + 0.18
fluorescence units min-' which significantly declined to
-0.03 + 0.15
fluorescence units min-I over the next hour. Subsequent to this there were no
significant changes. No significant change with time was detected for cores that
were dark and exposed.
2) At the start of the immersion period (corresponding to time in situ)
Cores were kept exposed and light over the low tide period. Cores that
were subsequently darkened exhibited a significantly greater rate of decrease in
the Fý 15 yield in the first hour after being darkened (F2,15 = 33.07, p