Table 1.

Hydrolysis rates for xylan and pullulan under different experimental treatments, nmol L^-1 h^-1.

Year	Pre-incubation period	Xylan	Pullulan
2005		No amendment	No amendment	+glucose	+maltotriose	+$\mathrm{N}{\mathrm{O}}_{\mathrm{3}}^{\mathrm{-}}$	+$\mathrm{P}{\mathrm{O}}_{\mathrm{4}}^{\mathrm{3}\mathrm{-}}$	+$\mathrm{N}{\mathrm{O}}_{\mathrm{3}}^{\mathrm{-}}$+$\mathrm{P}{\mathrm{O}}_{\mathrm{4}}^{\mathrm{3}\mathrm{-}}$
	24 h	4.3	0	0	0	0	0	0
	5 days	6.8	0	0	0.86 ± 0.13	0	0	0
2006			No amendment	+glucose	+maltotriose	+pullulan	+AA	+$\mathrm{N}{\mathrm{O}}_{\mathrm{3}}^{\mathrm{-}}$+$\mathrm{P}{\mathrm{O}}_{\mathrm{4}}^{\mathrm{3}\mathrm{-}}$
	12 h	n.m.	0	0	0	0	0	0
	3 days	n.m.	0	0	0	0	0	0

Glucose, maltotriose, and unlabeled pullulan concentrations were 0.875 μmol L^-1 monomer-equivalent. $\mathit{N}{\mathit{O}}_{\mathit{3}}^{\mathrm{-}}$ concentration was 40 μM as K$\mathit{N}{\mathit{O}}_{\mathit{3}}^{\mathrm{-}}$; $\mathit{P}{\mathit{O}}_{\mathit{4}}^{\mathit{3}\mathrm{-}}$ concentration was 16 μM as Na₂HPO₄. +AA treatment included all 20 genetically-encoded amino acids at equimolar concentrations, for a total concentration of 5.25 μM-C. n.m. indicates that xylan hydrolysis in 2006 was not measured in Isfjorden waters.