The density of zooxanthellae in M. digitata did not change significantly
over time under high nitrate (10 μM) only (N) or high light
(600μmolm−2 s−1) only (HL) conditions for 6 days, although zooxanthellae
density slightly increased under high nitrate conditions,
and slightly decreased under high light conditions (Fig. 1(a)). With
high temperature (32 °C) only (HT), zooxanthellae density was
not significantly changed by day 3, but had significantly decreased
by day 6, compared with the control (C) (P < 0.05). Combining
both high light and high temperature with high nitrate levels (HLN
and HTN) significantly decreased zooxanthellae density by day 3
(P < 0.05). After 6 days of incubation, about 70% of zooxanthellae
were lost under HLN, HT, and HTN conditions compared with
the control, although no significant difference was found among
these three conditions. A significant difference was observed between
high light conditions with nitrate and high light conditions
without nitrate on days 3 and 6. A significant difference was also
found under high temperature conditions by day 3, both with and
without nitrate.
The Fv/Fm ratio (Fig. 1(b)) decreased significantly (P < 0.05)
withHT and HTN treatments compared with control (C). The Fv/Fm
under high temperature was equal to about 70% of control on day
6. On the other hand, the Fv/Fm values were not changed with N,
HL, and HLN treatments.
The density of zooxanthellae in M. digitata did not change significantlyover time under high nitrate (10 μM) only (N) or high light(600μmolm−2 s−1) only (HL) conditions for 6 days, although zooxanthellaedensity slightly increased under high nitrate conditions,and slightly decreased under high light conditions (Fig. 1(a)). Withhigh temperature (32 °C) only (HT), zooxanthellae density wasnot significantly changed by day 3, but had significantly decreasedby day 6, compared with the control (C) (P < 0.05). Combiningboth high light and high temperature with high nitrate levels (HLNand HTN) significantly decreased zooxanthellae density by day 3(P < 0.05). After 6 days of incubation, about 70% of zooxanthellaewere lost under HLN, HT, and HTN conditions compared withthe control, although no significant difference was found amongthese three conditions. A significant difference was observed betweenhigh light conditions with nitrate and high light conditionswithout nitrate on days 3 and 6. A significant difference was alsofound under high temperature conditions by day 3, both with andwithout nitrate.The Fv/Fm ratio (Fig. 1(b)) decreased significantly (P < 0.05)withHT and HTN treatments compared with control (C). The Fv/Fmunder high temperature was equal to about 70% of control on day6. On the other hand, the Fv/Fm values were not changed with N,HL, and HLN treatments.
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