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Kinetics of nitrate, ammonium, and urea uptake by four intertidal seaweeds from New Zealand
journal contribution
posted on 2023-05-18, 02:03 authored by Phillips, JC, Catriona HurdCatriona HurdThe competitive ability for N uptake by four intertidal seaweeds, Stictosiphonia arbuscula (Harvey) King et Puttock, Apophlaea lyallii Hook. f. et Harvey, Scytothamnus australis Hook. f. et Harvey, and Xiphophora gladiata (Labillardière) Montagne ex Harvey, from New Zealand is described by the uptake kinetics for NO3−, NH4+, and urea. This is the first study to report uptake kinetics for N uptake by a range of southern hemisphere intertidal seaweeds in relation to season and zonation. Species growing at the highest shore positions had higher NO3− and urea uptake at both high and low concentrations and had unsaturable NH4+ uptake in both summer and winter. Although there was evidence of some feedback inhibition of Vmax for NO3− uptake by Stictosiphonia arbuscula growing at the lower vertical limits of its range, rates were high compared with species growing lower on the shore. Our results highlight the superior competitive ability for N uptake of certain high intertidal seaweeds, and consistent with our previous findings we can conclude that intertidal seaweeds in southeast New Zealand are adapted to maximizing N acquisition in a potentially N-limiting environment.
History
Publication title
Journal of PhycologyVolume
40Pagination
534-545ISSN
0022-3646Department/School
Institute for Marine and Antarctic StudiesPublisher
Blackwell Publishing IncPlace of publication
350 Main St, Malden, USA, Ma, 02148Rights statement
Copyright 2004 Phycological Society of AmericaRepository Status
- Restricted