Temporal and spatial variations in photosynthetic physiology of diatoms during the spring bloom in the western subarctic Pacific

Yoshie, Naoki; Suzuki, Koji; Kuwata, Akira; Nishioka, Jun; Saito, Hiroaki

doi:10.3354/meps08329

Cited by 20 publications

(29 citation statements)

References 46 publications

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“…Within the genus Thalassiosira alone, there are an estimated 100 different freshwater and marine species from a wide range of habitats (Round et al, 1990). Thalassiosira species are important contributors to marine primary production in temperate to polar regions (Karentz and Smayda, 1984; Degerlund and Eilertsen, 2010), where they can be a significant component of phytoplankton blooms (Haigh et al, 1992; Hoppenrath et al, 2007; Yoshie et al, 2010). …”

Section: Introductionmentioning

confidence: 99%

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Chappell¹,

Whitney²,

Haddock³

et al. 2013

Front. Microbiol.

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Diatoms are genetically diverse unicellular photosynthetic eukaryotes that are key primary producers in the ocean. Many of the over 100 extant diatom species in the cosmopolitan genus Thalassiosira are difficult to distinguish in mixed populations using light microscopy. Here, we examine shifts in Thalassiosira spp. composition along a coastal to open ocean transect that encountered a 3-month-old Haida eddy in the northeast Pacific Ocean. To quantify shifts in Thalassiosira species composition, we developed a targeted automated ribosomal intergenic spacer analysis (ARISA) method to identify Thalassiosira spp. in environmental samples. As many specific fragment lengths are indicative of individual Thalassiosira spp., the ARISA method is a useful screening tool to identify changes in the relative abundance and distribution of specific species. The method also enabled us to assess changes in Thalassiosira community composition in response to chemical and physical forcing. Thalassiosira spp. community composition in the core of a 3-month-old Haida eddy remained largely (>80%) similar over a 2-week period, despite moving 24 km southwestward. Shifts in Thalassiosira species correlated with changes in dissolved iron (Fe) and temperature throughout the sampling period. Simultaneously tracking community composition and relative abundance of Thalassiosira species within the physical and chemical context they occurred allowed us to identify quantitative linkages between environmental conditions and community response.

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Section: Introductionmentioning

confidence: 99%

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Chappell¹,

Whitney²,

Haddock³

et al. 2013

Front. Microbiol.

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“…[]. If the weighting factor of PAR in the surface water were changed (e.g., change the factor from 0.5 to 0.6 (or to 0.3)), spring bloom onset in the Oyashio could not be explained by the CDH (data not shown), which was inconsistent with the previous finding [e.g., Yoshie et al ., ]. Regarding the compensation light intensity, while the reported values ranged from 0.1 to 3.3 mol photons m −2 d −1 , the global average of 1.1 ± 0.4 mol photons m −2 d −1 was comparable with that in this study [ Regaudie‐de‐Gioux and Duarte , ].…”

Section: Discussionmentioning

confidence: 99%

“…Meanwhile, the bloom peaks at different latitudes (Areas 1 and 4) occurred at the same month, May, and thus, as with the bloom onset timing, the difference of bloom peak timing would not be ascribable to difference of day length. The timing of bloom peak could be controlled by not only light intensity but also nutrient concentration and phytoplankton species composition [ Yoshie et al ., ; Suzuki et al ., ]. Since the available data set in the present study was limited, here we discussed possible factors controlling not the timing of bloom peak but the magnitude of spring bloom.…”

Section: Discussionmentioning

confidence: 99%

Regional variability of factors controlling the onset timing and magnitude of spring algal blooms in the northwestern North Pacific

et al. 2014

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[2] Satellite imagery and oceanographic data collected between 2003 and 2009 were used to examine factors controlling the onset timing and magnitude of spring algal blooms in the northwestern North Pacific. Consistent with the critical depth hypothesis, the spring bloom onsets coincided with the mixed layer depth (MLD) shoaling in the north of the Kuroshio extension and in Oyashio, where complex frontal physical structures and turbulence weakening, respectively, would be responsible for the MLD shoaling. In contrast, in the formation regions of the dense central mode water (D-CMW) and the transition region mode water (TRMW), bloom onsets coincided with possible turbulence weakening but not with MLD shoaling. The peak of chlorophyll a in the formation regions of the D-CMW (0.44 6 0.23 mg m 23 ) and the TRMW (0.58 6 0.34 mg m 23 ) were ca. 5 times lower than that in the Oyashio (2.54 6 0.74 mg m 23 ), despite the fact that nitrate concentration during the prebloom period was high ($10 mM) and MLDs became shallow enough at the bloom peak in all the three regions. These observations indicated that light conditions and nitrate concentration did not explain the regional variability in the magnitude of spring blooms. The bloom magnitude west of ca. 150 E and in the north Kuroshio extension was increased relative to that in the eastern region, suggesting a chemical property in the water delivered from the Okhotsk Sea that would influence the western bloom. Our results demonstrated that factors controlling the timing and magnitude of spring algal blooms depend on the physicochemical regime in the northwestern North Pacific.

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“…In the absence of measurements of the photosynthesis-to-irradiance relationship during sampling, we choose a saturation level of 500 μmol photons m −2 s −1 , which is within the range of observed values (e.g. Gilstad et al, 1993;Meyercordt et al, 1999;Yoshie et al, 2010), and we assume that there is no photoinhibition. Therefore, P is modeled as:…”

Section: O 2 and δ 18 O Modelmentioning

confidence: 99%

“…Gilstad et al, 1993;Meyercordt et al, 1999;Yoshie et al, 2010). Using the modeled peak photosynthesis rate, the measured chlorophyll concentration, and a ratio of O 2 production to 14 C production of 2.7-3.5 (measured isotopically or via O 2 /Ar ratios; Bender et al, 1999;Laws et al, 2000;Hamme et al, 2012), we calculate an assimilation number of 5.1-8.0 mg C (mg Chl a) −1 h −1 .…”

Section: Variablementioning

confidence: 99%

Continuous measurements of dissolved O2 and oxygen isotopes in the Southern California coastal ocean

Rafelski

Paplawsky

2015

Marine Chemistry

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a b s t r a c tDissolved O 2 /N 2 , O 2 /Ar, O 2 saturation and δ 18 O were measured continuously near the surface ocean at the Scripps Institution of Oceanography pier in La Jolla, California, for five weeks. The data showed diurnal cycles in O 2 and δ 18 O, with amplitudes of 19 mmol m −3 and 1.1‰, respectively. The diurnal cycles are well described by a box model that includes photosynthesis, respiration, air-sea gas exchange, and mixing. The timing of the cycles can be explained using a photosynthesis rate proportional to photosynthetically active radiation, and the shapes of the cycles can be explained by mixing with a subsurface layer of water that is supersaturated in O 2 . Based on the diurnal cycles in O 2 and δ 18 O, the average maximum daily photosynthesis rate was 3.7-4.7 mmol O 2 m −3 h −1 , which is supported by the light-saturated photosynthesis rate estimated from the measured chlorophyll concentration. In the future, these continuous measurement techniques could be used at different locations and depths to improve the understanding of variability in oceanic primary production.

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Temporal and spatial variations in photosynthetic physiology of diatoms during the spring bloom in the western subarctic Pacific

Cited by 20 publications

References 46 publications

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Thalassiosira spp. community composition shifts in response to chemical and physical forcing in the northeast Pacific Ocean

Regional variability of factors controlling the onset timing and magnitude of spring algal blooms in the northwestern North Pacific

Continuous measurements of dissolved O2 and oxygen isotopes in the Southern California coastal ocean

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