. 2022 Mar 4;5:207. doi: 10.1038/s42003-022-03148-8

Table 3.

Photophysiological responses.

	F_v/F_m	σ_PSII	τ_QA	P
	rel. unit	nm²	μs	rel. unit
West
Initial	0.21 ± 0.02	5.61	588	0.25
Control	0.26 ± 0.04^c	4.46 ± 1.00^a	470 ± 58^a	0.13 ± 0.05^c
+Mn	0.25 ± 0.04^c	4.20 ± 0.73^a	536 ± 57^a	0.18 ± 0.06^c
+Fe	0.44 ± 0.05^b	4.26 ± 1.51^a	643 ± 11^a	0.36 ± 0.06^b
+FeMn	0.51 ± 0.04^a	2.80 ± 1.24^b	721 ± 60^b	0.35 ± 0.03^a
East
Initial	0.18 ± 0.03	4.68	290	0.10
Control	0.25 ± 0.07^c	3.42 ± 1.15^b	669 ± 280^b	0.21 ± 0.01^c
+Mn	0.27 ± 0.01^c	4.68 ± 0.52^a	598 ± 46^a	0.24 ± 0.02^c
+Fe	0.43 ± 0.05^b	3.22 ± 1.52^b	711 ± 66^b	0.36 ± 0.02^b
+FeMn	0.47 ± 0.02^a	3.41 ± 1.16^b	718 ± 23^b	0.37 ± 0.01^a

The dark-adapted maximum photosystem II quantum yield (F_v/F_m), the functional absorption cross-section of PSII (σ_PSII), the time constant for electron transfer at PSII (τ_QA) and the connectivity between adjacent photosystems (P) were determined at the start and the end of the experiment from the communities sampled West and East after exposure to different Fe and Mn availabilities. Values represent the mean ± SD (n > 10). Different letters indicate significant differences between treatments (p < 0.05).