TABLE 4.

Calculation of temperature effects on photosynthetic oxygen evolution (A) and respirational oxygen consumption (B) of eight tested benthic Baltic Sea diatom strains using the Blanchard et al. (1996) fit; additionally, the respective activation energy (E_a) is given.

	dO2 (μmol O2 mg–1 Chl a h–1)			Temperature (°C)			Ea (eV)
	100%	>80%	>20%	100%	>80%	>20%
(A) Photosynthesis
Actinocyclus octonarius	85	>68.06	>17.01	12.6	7 – 18.2	(−2.5) – 27.6	0.47
Melosira moniliformis	37.17	>29.74	>7.43	20.9	13.2 – 28.6	(0.2) – (41.5)	1.37
Halamphora sp. 1	36.92	>29.54	>7.38	28.8	24.3 – 33.2	16.8 – (40.7)	0.62
Halamphora sp. 2	132.85	>106	>26.57	20.3	13.5 – 27	(2.0) – 38.4	0.59
Navicula perminuta	14.32	>11.46	>2.86	19.2	12.9 – 25.6	(2.2) – 36.2	0.22
Navicula phyllepta	68.97	>55.18	>13.79	21.0	15.9 -26.0	7.4 – 34.5	0.72
Nitzschia dubiiformis	138.11	>110.49	>27.62	21.4	16.6 – 26.1	8.5 – 34.2	0.58
Nitzschia pusilla	75.67	>60.54	>15.13	27.9	21.0 – 34.8	9.4 – (46.3)	0.60
(B) Respiration
Actinocyclus octonarius	–25.07	$<-20.06$	$<-5.01$	33.4	23.5 – (43.4)	6.6 – (60.1)	0.38
Melosira moniliformis	–62.85	$<-50.28$	$<-12.57$	27.9	19.0 – 36.8	(3.9) – (51.8)	0.52
Halamphora sp. 1	–28.04	$<-22.43$	$<-5.61$	24.3	17.7 – 31.0	6.4 – (42.1)	0.98
Halamphora sp. 2	–44.64	$<-35.71$	$<-8.93$	29.5	20.5 – 38.5	5.3 – (53.6)	0.63
Navicula perminuta	–13.11	$<-10.49$	$<-2.62$	25.5	16.0 – 35.0	(−0.1) – (50.9)	0.67
Navicula phyllepta	–29.41	$<-23.53$	$<-5.88$	29.6	20.4 – 38.8	(4.8) – (54.2)	0.38
Nitzschia dubiiformis	–52.59	$<-42.07$	$<-10.52$	30.4	23.8 – 37.0	12.06 – (48.2)	1.92
Nitzschia pusilla	–31.35	$<-25.08$	$<-6.27$	35.7	24.6 – (46.8)	5.8 – (65.4)	0.39

Data represent mean values (n = 3) of the maximum photosynthesis and respiration (100%) as well as the upper 80 and 20% percentile. Data in brackets represent temperature calculation exceeding measured temperature.