“…more responsive to NH þ 4 dosing than those from deep waters (M. spicatum, P. pectinatus, C. demersum, P. maackianus and V. natans). It is not clear, however, why the submersed macrophytes adapted to a high light climate (shallow waters) were more prone to accumulate FAA when faced with high NH þ 4 dosing, but it is known that leaves of sun plants exposed to high light need more proteins to support high photosynthesis and have high NH þ 4 turnover in photorespiration (Givnish, 1988;Noguchi et al, 2001;Pystina & Danilov, 2001). Colonising water depths were closely correlated with SC (F-C)/C in leaves but not with FAA (F-C)/C in leaves, possibly because plants experiencing high NH þ 4 dosing lost much more carbohydrate than the amount of carbon skeletons for incorporating NH þ 4 into FAA (Britto et al, 2001;Cao et al, 2004Cao et al, , 2009a, which might have weakened a relationship between colonising water depths and FAA (F-C)/C in comparison with the relationship for the SC (F-C)/C in leaves.…”