Light utilization efficiency and quantum yield of phytoplankton in a thermally stratified sea1

Kishino, Motoaki; Okami, Noboru; Takahashi, Masayuki; Ichimura, Shun‐ei

doi:10.4319/lo.1986.31.3.0557

Cited by 93 publications

(62 citation statements)

References 10 publications

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“…Both light utilization efficiency and quantum yield increased with depth and showed a maximum at the subsurface chlorophyll maximum in a lake and the sea (Priscu, 1984;Kishino et al, 1986). The same trends were found in this study, but both maxima were observed at the 10% light level except in the neritic area (Sta.…”

Section: Discussionsupporting

confidence: 73%

“…We used 0.016 m 2 ·µgChl.a -1 for the chlorophyll a-specific absorption coefficient for estimation of quantum yield independent of depth (Laws et al, 1990). We used it even though it has been reported that this value increased with depth due to differences in the energy spectrum of solar radiation with depth in natural water (Kishino et al, 1986;Laws et al, 1990). However, samples in our experiments were exposed to the same energy spectrum with different radiant intensity because of using the simulated in situ method.…”

Section: Light Utilization Efficiency and Quantum Yieldmentioning

confidence: 99%

“…Dubinsky and Berman, 1976;Welschmeyer and Lorenzen, 1981;Priscu, 1984;Laws et al, 1990). However, there have been few studies in Japanese waters (Taguchi et al, 1977;Kishino et al, 1986;Takahashi et al, 1989). Therefore, we measured light in the air and water simultaneously and calculated the light utilization efficiency and quantum yield.…”

Section: Introductionmentioning

confidence: 99%

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Primary productivity in a cold water mass and the neighborhood area occurring off Enshu-nada in the late summer of 1989

Shimoto

Matsumura

1992

J Oceanogr

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Primary productivity off Enshu-nada was measured by the 13 C method in September 1989. Primary productivity was estimated in a cold water mass developed off Enshunada for the first time. The obtained value was 469 mgC·m -2 ·d -1 and higher than those in the pelagic area of Kuroshio, but equivalent to those in the neritic and the Oyashio areas. It was indicated that cold water mass is the place where organic matter is produced actively. Extremely high chlorophyll a of more than 5 µg·l -1 were found in the cold water mass. The high productivity was due to high standing crop of phyoplankton. Furthermore, calculated light efficiency and quantum yield showed consistent increase with depth and showed a maximum at 10% light level. Both were larger on the coastal side than those on the oceanic side of the Kuroshio current.

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Section: Discussionsupporting

confidence: 73%

Section: Light Utilization Efficiency and Quantum Yieldmentioning

confidence: 99%

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Primary productivity in a cold water mass and the neighborhood area occurring off Enshu-nada in the late summer of 1989

Shimoto

Matsumura

1992

J Oceanogr

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“…PAR(z) is defined as Vandevelde et al 1989), and the latter is the maximal observable quantum yield (Kirk 1983;Kishino et al 1986). To run the model of Eq.…”

Section: Methodsmentioning

confidence: 99%

Variations in the specific absorption coefficient for natural phytoplankton assemblages: Impact on estimates of primary production

Babin

Therriault²,

Legendre³

et al. 1993

Limnology & Oceanography

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Data collected in the estuary and Gulf of St. Lawrence in summer 1989 and 1990 were analyzed to quantify horizontal variations in the spectral values of the specific absorption coefficient of phytoplankton in different natural environments and to examine the conscquenccs of assuming this specific absorption spectrum as constant when estimating primary production.Absorption spectra of total particles were measured with the glass-fiber filter technique, and absorption by phytoplankton was estimated numerically. We analyzed 369 spectra to estimate the actual extent of variations in the specific absorption coefficient by phytoplankton at several spatial scales in the St. Lawrcncc system. The potential impact of these variations on the estimation of primary production was assessed for various ecosystems with a spectral primary production model. This model takes into account chlorophyll variations with depth together with associated variations in attenuance and variations in partitioning of the various absorbing components in going from eutrophic to oligotrophic waters. Using this model, we found that, at large scale (> 1,000 km), the relative error in estimating primary production can bc as high as 24% in oligotrophic waters when a constant specific absorption spectrum is assumed. Field measurements of primary production support results dcrivcd from the model

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“…Assuming light to be the dominant driver of vertical changes in primary production, we finally want to investigate vertical changes in phytoplankton light acclimation. Field (Grobbelaar 1985;Kishino et al 1986;MacIntyre et al 2002) and laboratory studies (Grobbelaar et al 1995;Mouget et al 1999) have previously shown a photoacclimative response to decreasing light by increasing the light utilization efficiency (a; slope of the initial part of the photosynthesis vs. light curve). Experimental studies (Staehr and Sand-Jensen 2006) have shown that a is higher under nutrient-replete conditions.…”

mentioning

confidence: 99%

Vertical patterns of metabolism in three contrasting stratified lakes

Obrador

Stæhr

Christensen

2014

Limnology & Oceanography

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Recent advances in open-water measurements suggest significant temporal and spatial variability of gross primary production (GPP), net ecosystem production (NEP), and respiration (R) with implications for understanding carbon cycling in lakes. This study applied high-frequency depth profiles in three stratified lakes of different trophic status to investigate (1) the importance of vertical variations in metabolic rates, (2) the effects of changes in the depth of the mixed layer (Z mix ) and the photic zone (Z eu ), and (3) the photoacclimative responses of the aquatic autotrophs to changes in these conditions. Taking account of vertical differences in metabolism improved the reliability of whole-areal NEP estimates during stratification. Whereas the hypolimnion was always heterotrophic, and the epilimnion was mostly autotrophic, the metalimnion had NEP . 0 when Z eu . Z mix . Although most of GPP and R occurred in the epilimnion, between 0% and 20% of GPP and 4% and 37% of R took place in the metalimnion. Areal metabolic estimates based on surface measurements deviated up to 60% for GPP and 80% for R when Z eu . Z mix . The vertical variability in metabolism was driven by available light in both the epi-and metalimnion. Coupling between GPP and R was low in all layers and indicated increasing background R with depth. Light utilization efficiency was significantly higher under low light conditions, indicating photophysiological acclimation of phytoplankton to decreasing light in the metalimnion.

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Light utilization efficiency and quantum yield of phytoplankton in a thermally stratified sea1

Cited by 93 publications

References 10 publications

Primary productivity in a cold water mass and the neighborhood area occurring off Enshu-nada in the late summer of 1989

Primary productivity in a cold water mass and the neighborhood area occurring off Enshu-nada in the late summer of 1989

Variations in the specific absorption coefficient for natural phytoplankton assemblages: Impact on estimates of primary production

Vertical patterns of metabolism in three contrasting stratified lakes

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