Figure 1.
Visual assessment of Symbiodinium uptake.
Juveniles were scored in two categories (white or pigmented) according to pigmentation levels. The specimen on the left is a typical “white” juvenile while the two on the right represent a range of “pigmented” juveniles.
Table 1.
Summary of total number of juveniles counted at each temperature by light treatment during the mid-experiment census (mid) and for the census at the end of the experiment (end).
Figure 2.
Pigmentation ratios (±1 SE) of coral juveniles kept at 28, 30, or 31°C and under high light (a,b; 390 µmol photons m−2 s−1) or low light (c,d; 180 µmol photons m−2 s−1) levels.
Pigmentation ratios were calculated after 10 (A. tenuis a, c) or 15 (A. millepora b, d) days of exposure to Symbiodinium, and again after a further 10 or 15 days in filtered sea water (1 µm) without additional exposure to Symbiodinium. See Table 1 for sample sizes.
Figure 3.
Symbiodinium cell counts in A. tenuis juveniles kept at 28, 30, or 31°C and under high light (a, 390 µmol photons m−2 s−1) or low light (b, 180 µmol photons m−2 s−1) levels.
The number of cells was calculated from 10 replicate counts for each of 12 samples per treatment per day. Cell counts (±1 SE) were normalized to the number of polyps taken by each sample.
Table 2.
ANOVA results comparing the pigmentation ratio in A. tenuis juveniles exposed to three temperatures (28, 30, or 31°C) by two light levels (390 µmol photons m−2 s−1 or 180 µmol photons m−2 s−1) over a period of 20 days.
Table 3.
ANOVA results comparing the number of cells per polyp found in A. tenuis juveniles exposed to three temperatures (28, 30, or 31°C) by two light levels (390 µmol photons m−2 s−1 or 180 µmol photons m−2 s−1) over a period of 20 days.
Figure 4.
Relative survival (±1 SE) of juveniles in the 28, 30, or 31°C treatments and under high light (390 µmol photons m−2 s−1) or low light (180 µmol photons m−2 s−1) levels for: (a) Acropora tenuis after 20 days, and (b) A. millepora after 30 days.
See Table 1 for sample sizes.
Figure 5.
Change in Symbiodinium D∶C cell ratios (±1 SE) over time in Acropora tenuis juveniles at 28, 30, or 31°C in: (a) high light (390 µmol photons m−2 s−1), or (b) low light levels (180 µmol photons m−2 s−1).
Dotted line represents equal proportions of Symbiodinium types D and C cells within the juveniles. Ratios closer to 1 are dominated by type D; ratios closer to 0 are dominated by type C. N = 20 per data point.
Figure 6.
Change in Symbiodinium D∶C cell ratios (±1 SE) over time in Acropora millepora juveniles at 28, 30, or 31°C in: (a) high light (390 µmol photons m−2 s−1), or (b) low light levels (180 µmol photons m−2 s−1).
Dotted line represents equal proportions of Symbiodinium types D and C cells within the juveniles. Ratios closer to 1 are dominated by type D; ratios closer to 0 are dominated by type C. N = 10 per data point.
Table 4.
Repeated measures ANOVA results comparing changes in D∶C cell ratios in Acropora tenuis juveniles kept at three temperatures (28, 30, or 31°C) by two light levels (390 µmol photons m−2 s−1 or 180 µmol photons m−2 s−1).
Table 5.
Repeated measures ANOVA results comparing changes in D∶C cell ratios in A. millepora juveniles kept at three temperatures (28, 30, or 31°C) by two light levels (390 µmol photons m−2 s−1 or 180 µmol photons m−2 s−1).
Figure 7.
Long term sea temperature at 2 m depth in Geoffrey Bay, Magnetic Island.
Data was collected over 15 years (1996–2011) by loggers maintained by the Australian Institute of Marine Science (Channel ID 1820, data available from http://data.aims.gov.au/gbroosdata/services/rss/channel/923/150).