Phytoplankton photoacclimation and photoadaptation in response to environmental gradients in a shelf sea

C.M. Moore, D.J. Suggett, A.E. Hickman, Y.N. Kim, Jacqui Tweddle, J. Sharples, R.J. Geider, P.M. Holligan

Research output: Contribution to journalArticle

133 Citations (Scopus)

Abstract

Variability in the photosynthetic performance of natural phytoplankton communities, due to both taxonomic composition and the physiological acclimation of these taxa to environmental conditions, was assessed at contrasting sites within a temperate shelf sea region. Physiological parameters relating to the structure of the photosystem II (PSII) antenna and processes downstream from PSII were evaluated using a combination of fast repetition rate fluorescence, oxygen flash yields, spectral fluorescence, and C-14 photosynthesis versus irradiance measurements. Parameters relating to PSII antenna structure, specifically the functional absorption cross-section (sigma(PSII)) and the chlorophyll to PSII reaction center ratio, varied principally as a result of spatial (horizontal) taxonomic differences. Phenotypic plasticity in the size of the PSII light-harvesting antenna appeared to be limited. In contrast, parameters related to electron transport rates (ETRs) downstream of PSII, including the maximum ETR (1/tau(PSII)),the chlorophyll-specific maximum rate of carbon fixation (P*(max)), and the light-saturation intensity (E-k), all decreased from the surface to the subsurface chlorophyll maximum (SCM) in stratified waters. The primary photoacclimation response to the vertical light gradient thus resulted in decreasing light-saturated carbon fixation per reaction center with increasing depth. Increases in the ratio of PSII reaction centers to carbon fixation capacity thus dominated the phenotypic response to decreased irradiance within the SCM. Perhaps counterintuitively, phytoplankton populations within fully mixed water columns, characterized by low mean irradiance, were acclimated or adapted to relatively high irradiance.
Original languageEnglish
Pages (from-to)936-949
JournalLimnology and Oceanography
Volume51
Issue number2
Publication statusPublished - 2006

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shelf sea
environmental gradient
photosystem II
carbon fixation
irradiance
chlorophyll
phytoplankton
antenna
fluorescence
Calvin cycle
electron
phenotypic plasticity
acclimation
antennae
photosynthesis
electron transfer
cross section
water column
environmental conditions
saturation

Cite this

Moore, C. M., Suggett, D. J., Hickman, A. E., Kim, Y. N., Tweddle, J., Sharples, J., ... Holligan, P. M. (2006). Phytoplankton photoacclimation and photoadaptation in response to environmental gradients in a shelf sea. Limnology and Oceanography, 51(2), 936-949.

Phytoplankton photoacclimation and photoadaptation in response to environmental gradients in a shelf sea. / Moore, C.M.; Suggett, D.J.; Hickman, A.E.; Kim, Y.N.; Tweddle, Jacqui; Sharples, J.; Geider, R.J.; Holligan, P.M.

In: Limnology and Oceanography, Vol. 51, No. 2, 2006, p. 936-949.

Research output: Contribution to journalArticle

Moore, CM, Suggett, DJ, Hickman, AE, Kim, YN, Tweddle, J, Sharples, J, Geider, RJ & Holligan, PM 2006, 'Phytoplankton photoacclimation and photoadaptation in response to environmental gradients in a shelf sea', Limnology and Oceanography, vol. 51, no. 2, pp. 936-949.
Moore, C.M. ; Suggett, D.J. ; Hickman, A.E. ; Kim, Y.N. ; Tweddle, Jacqui ; Sharples, J. ; Geider, R.J. ; Holligan, P.M. / Phytoplankton photoacclimation and photoadaptation in response to environmental gradients in a shelf sea. In: Limnology and Oceanography. 2006 ; Vol. 51, No. 2. pp. 936-949.
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AB - Variability in the photosynthetic performance of natural phytoplankton communities, due to both taxonomic composition and the physiological acclimation of these taxa to environmental conditions, was assessed at contrasting sites within a temperate shelf sea region. Physiological parameters relating to the structure of the photosystem II (PSII) antenna and processes downstream from PSII were evaluated using a combination of fast repetition rate fluorescence, oxygen flash yields, spectral fluorescence, and C-14 photosynthesis versus irradiance measurements. Parameters relating to PSII antenna structure, specifically the functional absorption cross-section (sigma(PSII)) and the chlorophyll to PSII reaction center ratio, varied principally as a result of spatial (horizontal) taxonomic differences. Phenotypic plasticity in the size of the PSII light-harvesting antenna appeared to be limited. In contrast, parameters related to electron transport rates (ETRs) downstream of PSII, including the maximum ETR (1/tau(PSII)),the chlorophyll-specific maximum rate of carbon fixation (P*(max)), and the light-saturation intensity (E-k), all decreased from the surface to the subsurface chlorophyll maximum (SCM) in stratified waters. The primary photoacclimation response to the vertical light gradient thus resulted in decreasing light-saturated carbon fixation per reaction center with increasing depth. Increases in the ratio of PSII reaction centers to carbon fixation capacity thus dominated the phenotypic response to decreased irradiance within the SCM. Perhaps counterintuitively, phytoplankton populations within fully mixed water columns, characterized by low mean irradiance, were acclimated or adapted to relatively high irradiance.

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