TABLE 2.

Relative abundance of different lipids within mat samples

Category or compound	Peak no.a	Relative abundanceb
		NMA sourcec	NMA downstreamd	Tangerine Spring	Octopus Spring	Mushroom Spring	C. aurantiacusd	R. castenholziie
Chloroflexus biomarkers
C31:3 alkene	9	++	+	+	Trace	Trace	++	−
n-C31 wax ester	10	++	+	+	++	++	−
iso-C31 wax ester		+	+	+	+	+
n-C32 wax ester	12	+++	++	++	+++	+++	+
iso-C32 wax ester	11	+	+	+	+	+
C32:1 wax ester							+
n-C33 wax ester	14	+++	++	++	+++	+++	+
iso-C33 wax ester	13	+	+	+	+	+
n-C34 wax ester	16	+++	++	++	+++	+++	++
iso-C34 wax ester	15	+	+	+	+	+
C34:1 wax ester							+
n-C35 wax ester		+	+	+	++	++	++
n-C36 wax ester		+	−	+	+	+	++
C36:1 wax ester							+
n-C37 wax ester		+	−	+	+	+	+	+
n-C38 wax ester								++
n-C39 wax ester								+
n-C40 wax ester								++
Cyanobacterial biomarker
C17n-alkane	1	−	++	++	+	+	−	−
Nondiagnostic lipids
C15 fatty acid	2	++	++	+	+	++	+	−
C16 fatty acid	3	++	+++	+++	+	++	+++	−
C17 fatty acid	4	+	+	+	+	++	+++	−
C17 alkanol	5	+++	++	++	++	+++	+	−
C18:1 fatty acid	6	−	+++	++	−	−	+++	−
C18 fatty acid	7	+	++	++	+	+	+++	−
C18 alkanol	8	+++	+	++	+	++	++	−

^aSee Fig. 1.

^b+, detected; ++, ∼50% of base peak; +++, base peak; trace; detected in very low abundance; −, not detected.

^cPreviously reported by van der Meer et al. (39).

^dKnudsen et al. (17), Shiea et al. (35), and van der Meer et al. (40).

^evan der Meer et al. (41).