Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds

High in situ rates of phosphate uptake should coincide with high tissue phosphorus content and/or high growth rate and be either supply-driven (largely controlled by the phosphate concentration in the surrounding seawater) or demand-driven (largely dictated by the maximum uptake rate, Vmax, and unde...

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Autores principales:	EJ Douglas, TR Haggitt, TAV Rees
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2014
Materias:	Biology (General) QH301-705.5 Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/91836fe4b3c045bfa329c0c4fc277da7
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spelling	oai:doaj.org-article:91836fe4b3c045bfa329c0c4fc277da72021-11-18T09:19:58ZSupply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds1864-77821864-779010.3354/ab00601https://doaj.org/article/91836fe4b3c045bfa329c0c4fc277da72014-12-01T00:00:00Zhttps://www.int-res.com/abstracts/ab/v23/n1/p49-60/https://doaj.org/toc/1864-7782https://doaj.org/toc/1864-7790High in situ rates of phosphate uptake should coincide with high tissue phosphorus content and/or high growth rate and be either supply-driven (largely controlled by the phosphate concentration in the surrounding seawater) or demand-driven (largely dictated by the maximum uptake rate, Vmax, and under the control of the organism). To test this hypothesis, 6 common New Zealand seaweed species (Cystophora torulosa, Melanthalia abscissa, Pterocladia lucida, Ulva intestinalis, Xiphophora chondrophylla and Zonaria turneriana) were used. We calculated in situ rates of phosphate uptake from the kinetic constants of uptake, monthly rates of uptake at a fixed phosphate concentration and seawater phosphate concentration, and compared these rates with monthly tissue phosphorus content. There were no significant differences in the half-saturation constant (Km) values for phosphate uptake by the 6 species. Vmax and affinity (Vmax/Km) were largely a function of the seaweed surface area:volume quotient. In the 5 species where there was a peak in tissue phosphorus levels, it occurred in July or September/October. Peaks in tissue phosphorus in M. abscissa, P. lucida, U. intestinalis and Z. turneriana coincided with, or occurred soon after, peaks in calculated in situ rates of phosphate uptake. Maximum rates of in situ phosphate uptake were demand-driven in all subtidal species and supply-driven in the only intertidal alga U. intestinalis.EJ DouglasTR HaggittTAV ReesInter-ResearcharticleBiology (General)QH301-705.5MicrobiologyQR1-502ENAquatic Biology, Vol 23, Iss 1, Pp 49-60 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5 Microbiology QR1-502
spellingShingle	Biology (General) QH301-705.5 Microbiology QR1-502 EJ Douglas TR Haggitt TAV Rees Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds
description	High in situ rates of phosphate uptake should coincide with high tissue phosphorus content and/or high growth rate and be either supply-driven (largely controlled by the phosphate concentration in the surrounding seawater) or demand-driven (largely dictated by the maximum uptake rate, Vmax, and under the control of the organism). To test this hypothesis, 6 common New Zealand seaweed species (Cystophora torulosa, Melanthalia abscissa, Pterocladia lucida, Ulva intestinalis, Xiphophora chondrophylla and Zonaria turneriana) were used. We calculated in situ rates of phosphate uptake from the kinetic constants of uptake, monthly rates of uptake at a fixed phosphate concentration and seawater phosphate concentration, and compared these rates with monthly tissue phosphorus content. There were no significant differences in the half-saturation constant (Km) values for phosphate uptake by the 6 species. Vmax and affinity (Vmax/Km) were largely a function of the seaweed surface area:volume quotient. In the 5 species where there was a peak in tissue phosphorus levels, it occurred in July or September/October. Peaks in tissue phosphorus in M. abscissa, P. lucida, U. intestinalis and Z. turneriana coincided with, or occurred soon after, peaks in calculated in situ rates of phosphate uptake. Maximum rates of in situ phosphate uptake were demand-driven in all subtidal species and supply-driven in the only intertidal alga U. intestinalis.
format	article
author	EJ Douglas TR Haggitt TAV Rees
author_facet	EJ Douglas TR Haggitt TAV Rees
author_sort	EJ Douglas
title	Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds
title_short	Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds
title_full	Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds
title_fullStr	Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds
title_full_unstemmed	Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds
title_sort	supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds
publisher	Inter-Research
publishDate	2014
url	https://doaj.org/article/91836fe4b3c045bfa329c0c4fc277da7
work_keys_str_mv	AT ejdouglas supplyanddemanddrivenphosphateuptakeandtissuephosphorusintemperateseaweeds AT trhaggitt supplyanddemanddrivenphosphateuptakeandtissuephosphorusintemperateseaweeds AT tavrees supplyanddemanddrivenphosphateuptakeandtissuephosphorusintemperateseaweeds
_version_	1718420914257788928

Supply- and demand-driven phosphate uptake and tissue phosphorus in temperate seaweeds

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