Table 1 Taxa-specific assimilation rates based on single-cell measurements.

	N-specific ammonium assimilation h⁻¹	Cell-specific ammonium assimilation fmol cell⁻¹ h⁻¹	Carbon to ammonium assimilation ratio	N-specific nitrate assimilation h⁻¹	Cell-specific nitrate assimilation fmol cell⁻¹ h⁻¹	Carbon to nitrate assimilation ratio	C-specific carbon assimilation h⁻¹	Cell-specific carbon assimilation fmol cell⁻¹ h⁻¹
Diatoms
Chaetoceros spp. >8 µm	0.335 ± 0.015	271.9 ± 11.8	0.84 ± 0.06	0.051 ± 0.005	41.5 ± 4.1	6.9 ± 0.9	0.038 ± 0.002	204.5 ± 11.6
Chaetoceros spp. >8 µm	(n = 71)	(n = 71)	(n = 71)	(n = 61)	(n = 61)	(n = 61)	(n = 132)	(n = 132)
Asterionellopsis glacialis	0.357 ± 0.008	236.0 ± 5.5	1.12 ± 0.05	0.106 ± 0.002	70.1 ± 2.7	2.9 ± 0.1	0.051 ± 0.001	222.5 ± 5.3
Asterionellopsis glacialis	(n = 121)	(n = 121)	(n = 121)	(n = 59)	(n = 59)	(n = 59)	(n = 180)	(n = 180)
Other chain-forming diatoms 5–20 µm	0.211 ± 0.013p	122.9 ± 7.4	1.48 ± 0.14	0.054 ± 0.005	31.5 ± 3.0	5.5 ± 0.7	0.038 ± 0.002	145.0 ± 9.4
Other chain-forming diatoms 5–20 µm	(n = 53)	(n = 53)	(n = 53)	(n = 31)	(n = 31)	(n = 31)	(n = 104)	(n = 104)
Dinoflagellates
Tripos/Ceratium spp.	0.015 ± 0.002	563.1 ± 59.4	9.98 ± 2.1	0.004 ± 0.001	169.6 ± 21.4	26.7 ± 2.3	0.015 ± 0.001	3013.7 ± 156.7
Tripos/Ceratium spp.	(n = 46)	(n = 46)	(n = 46)	(n = 50)	(n = 50)	(n = 50)	(n = 96)	(n = 96)

Nitrogen (N)-specific ammonium assimilation (h⁻¹), cell-specific ammonium assimilation (fmol cell⁻¹ h⁻¹), carbon-to-ammonium assimilation ratio, nitrogen-specific nitrate assimilation (h⁻¹), cell-specific nitrate assimilation (fmol cell⁻¹ h⁻¹), carbon-to-nitrate assimilation ratio, carbon-specific carbon assimilation (average of ammonium and nitrate incubations), cell-specific carbon assimilation (average of ammonium and nitrate incubations, fmol cell⁻¹ h⁻¹), number of cells analyzed (n) from the ammonium (T5) and nitrate (T12) incubations in September. All values represent the average with the SE.

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