Table 1.

pH and oxygen, SD; coefficient of variation (CV) within the three layers of cyanobacterial mats from Ward Hunt Lake, July 7, 2010.

Layer	pH		Oxygen (% saturation)
	Mean ± SD	CV (%)	Mean ± SD	CV (%)
Black	7.7 ± 0.1	1.7	66.2 ± 14.9	22.5
Pink	7.8 ± 0.1	0.7	47.4 ± 8.2	17.2
Green	7.9 ± 0.0	0.6	14.1 ± 7.6	53.7

Black, Pink, and Green designate the upper, middle, and bottom layers of the mat.