Physiological plasticity of high-temperature intertidal cyanobacterial microbial mats to temperature and salinity: daily and seasonal in situ photosynthetic performance

Figures & data

Fig. 1. Schematic representation of the sampling location.

Fig. 2. Percentages of cyanobacterial communities in the different microbial mats.

Fig. 3. Changes in relative maximum electron transport rate (rETR_max) and optimal quantum yield (F_v/F_m) for microbial mats under variable water temperature (Mat YL1.1: a, c, f, i; Mat YL1.2: b, d, g, j; Mat YL4.1: e, h, k) throughout the day from June to October. Data are expressed as means ± SD (n = 5).

Fig. 4. Changes in relative maximum electron transport rate (rETR_max) and optimal quantum yield (F_v/F_m) for microbial mats under constant water temperature (Mat YL2.1: a, c, f, i; Mat YL3.1: b, d, g, j) throughout the day from June to October. Data are expressed as means ± SD (n = 5).

Fig. 5. Monthly variation of pigment content: Chlorophyll a-b (top), Phycobiliproteins (centre), Total carotenoids (bottom). Data are expressed as averaged daily pigment content ± SD (n = 5).

Table 1. Relative maximum electron transport rate (rETR_max) of five different microbial mats at different temperatures (20, 30, 40, 50 and 60ºC) and salinities (5, 20, 30‰) under controlled laboratory conditions.

		Salinity (‰)
Microbialmat	Temperature(°C)	5	20	30
1.1	20	8.1 ± 0.3	4.7 ± 0.2	5.5 ± 0.1
	30	21.4 ± 4.3	16.6 ± 5.3	20.8 ± 3.9
	40	28.6 ± 3.5	35.1 ± 4.5	38.1 ± 2.1
	50	26.5 ± 6.3	46.4 ± 3.3	45.7 ± 5.9
	60	1.5 ± 0.2	1.3 ± 0.1	1.6 ± 0.5
1.2	20	5.6 ± 0.8	7.1 ± 0.5	9.7 ± 0.2
	30	4.2 ± 0.5	10.2 ± 2.1	11.5 ± 3.1
	40	5.3 ± 1.1	32.7 ± 6.7	35.8 ± 8.2
	50	16.5 ± 3.3	30.3 ± 4.9	29.6 ± 7.9
	60	3.1 ± 1.1	2.1 ± 0.6	4.6 ± 0.3
4.1	20	6.1 ± 1.5	4.6 ± 0.5	4.7 ± 0.9
	30	16.3 ± 4.5	19.2 ± 4.6	21.5 ± 3.3
	40	48.6 ± 5.1	50.7 ± 4.7	48.1 ± 8.2
	50	27.1 ± 4.3	30.3 ± 2.9	34.5 ± 5.9
	60	6.1 ± 1.1	3.1 ± 0.6	1.6 ± 0.3
2.1	20	6.2 ± 0.4	8.2 ± 0.6	5.6 ± 0.3
	30	12.3 ± 0.3	20.1 ± 3.5	23.7 ± 4.1
	40	20.8 ± 3.1	41.7 ± 2.9	40.8 ± 3.9
	50	16.5 ± 4.9	43.3 ± 1.9	45.3 ± 9.9
	60	1.1 ± 0.1	4.1 ± 0.7	3.4 ± 1.1
3.1	20	10.1 ± 7.5	32.6 ± 9.5	36.7 ± 6.9
	30	21.2 ± 9.5	38.2 ± 6.1	41.5 ± 4.1
	40	33.3 ± 8.1	66.7 ± 2.7	65.8 ± 5.2
	50	45.3 ± 6.3	68.1 ± 9.9	66.6 ± 2.9
	60	10.1 ± 3.1	15.1 ± 5.6	20.6 ± 4.3

Data are expressed as means ± SD (n = 5).