Particulate organic carbon export in the upper twilight zone during the decline of the spring bloom

Pommier, Julien; Michel, Christine; Gosselin, Michel

doi:10.3354/meps07291

Cited by 13 publications

(12 citation statements)

References 42 publications

(55 reference statements)

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“…4b). We know from microscope taxonomic counts that Class I was composed of diatom bloom samples, Class II of declining diatom samples and Class III of mixed community samples (Pommier et al 2008). Pigment analyses matched the findings from microscope taxonomic analyses (except for D8), with a ratio of fucoxanthin to chl a > 0.4 (w w -1 ) from D1 to D8 and a decrease on D20 (Fig.…”

Section: C-solas Lagrangian Sitesupporting

confidence: 49%

“…Sampling took place at the end of a major spring bloom (Fig. 3), so the productivity (as represented by Λ and photosynthetic parameters) was not constant, but rather decreased over the nutrient-limited tail end of the bloom (Pommier et al 2008). This decrease in productivity has already been observed in the decline of other blooms (Platt et al 1992).…”

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confidence: 99%

“…Three classes of phytoplankton populations were designated: Class I represented the diatom bloom; Class II represented the declining diatom phase; and Class III represented a community of small-cell phytoplankton. The species composition has been observed microscopically (Pommier et al 2008), by pigment analysis (Fig. 4c) and by satellite imagery (Fig.…”

mentioning

confidence: 99%

“…The physiological state of the phytoplankton communities evolve with time, and in our study the species composition changed in time and space, being diatom-dominated during the Lagrangian Study and small-cell dominated on D8 and D20 (Figs. 2c & 4c; see also Pommier et al 2008). Three classes of phytoplankton populations were designated: Class I represented the diatom bloom; Class II represented the declining diatom phase; and Class III represented a community of small-cell phytoplankton.…”

mentioning

confidence: 99%

“…The photosynthetic parameters were obtained by fitting equation (1) to the observations. Simulated in situ primary production was measured using a 14 C technique described by Pommier et al (2008). Briefly, the bottles were incubated for 8 to 10 h on deck in temperature-controlled chambers, shaded to mimic the different optical depths.…”

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confidence: 99%

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Computation of primary production from remote sensing of ocean colour at the northwestern Atlantic C-SOLAS Lagrangian site

Forget¹,

Fuentes-Yaco²,

Sathyendranath³

et al. 2007

Mar. Ecol. Prog. Ser.

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At the C-SOLAS Lagrangian Study site, the phytoplankton community was dominated by diatoms in declining bloom conditions, which were characterised by a decrease in primary production over time. Measurements of primary production were performed using photosynthesis-light experiments and simulated in situ incubations. Several methods were used to assign photosynthetic parameters for estimation of primary production from remote-sensing of ocean colour: (1) the nearestneighbour method (NNM), (2) a temperature-dependent model, (3) an iterative approach to retrieve photosynthetic parameters from in situ measurements of phytoplankton production, and (4) average values of measured parameters. Owing to the declining status of the diatom population and its patchy distribution, the magnitude of primary production measured from in situ incubations was highly variable. Under bloom conditions, all methods underestimated production compared with results of simulated in situ measurements; however, the NNM provided the closest estimates to the in situ measurements. In the declining bloom phase, the NNM overestimated primary production, whereas the iterative method returned estimates of production in good agreement with the in situ observations. In conditions characterized by mixed-phytoplankton populations, the NNM returned estimates in agreement with the observations. A new method is proposed for classifying image pixels using criteria accessible to remote sensing, according to the phase of the diatom bloom (bloom versus declining conditions) and according to community composition (diatom versus mixed population). Upon separating the database used for parameter assignment into 2 parts, one representing the general phytoplankton community and the other representing declining diatom conditions, estimates of chlorophyll a-normalised water-column production were in good agreement with in situ observations. KEY WORDS: Response · Primary production · Remote sensing of ocean colour · Photosynthetic parametersResale or republication not permitted without written consent of the publisher Mar Ecol Prog Ser 352: 27-38, 2007 through phytoplankton photosynthesis in the ocean amounts to 50 Gt C yr -1 and is equivalent in magnitude to terrestrial primary production , Behrenfeld & Falkowski 1997, Behrenfeld et al. 2001. Moreover, through the biological pump, a proportion of this carbon will be transferred to the ocean floor via sedimentation of organic material (Longhurst & Harrison 1989). Quantification of primary production in the ocean is therefore of central importance to programmes such as SOLAS.Remote sensing of ocean colour is an effective method for computing primary production on a global scale , Antoine et al. 1996, Behrenfeld & Falkowski 1997. The method relies on estimation of chl a at the surface, estimation of the attenuation coefficient for downwelling light and the assignment of parameters describing the biomass profile at each image pixel, as well as the photosynthetic response to available light . The first 2 est...

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Section: C-solas Lagrangian Sitesupporting

confidence: 49%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Computation of primary production from remote sensing of ocean colour at the northwestern Atlantic C-SOLAS Lagrangian site

Forget¹,

Fuentes-Yaco²,

Sathyendranath³

et al. 2007

Mar. Ecol. Prog. Ser.

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Fecal pellet production by mesozooplankton in the subarctic Northeast Pacific Ocean

Stamieszkin¹,

Steinberg²,

Maas

2021

Limnology & Oceanography

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Mesozooplankton fecal pellets sinking from the sea-surface constitute an important component of the biological carbon pump, which is variable in part due to differences in zooplankton community composition on various scales. Particulate organic carbon production as fecal pellets by the entire mesozooplankton community has, until now, not been directly measured. We measured fecal pellet carbon (FPC) production rates of the mesozooplankton community separated into five size classes (0.2 to > 5.0 mm), and rates of key taxa, in the upper 100 m of the subarctic Northeast Pacific Ocean, August-September, 2018. We scaled up FPC production rates to total FPC production in the epipelagic zone, which was 2.8-fold higher at night than day due to diel vertical migration. Despite its lower total biomass, the smallest size class (0.2-0.5 mm) contributed more FPC than other size classes (up to 81.6%), due to high weight-specific FPC production rates (3.0 μgFPC mgDW −1 h −1 ). The pelagic tunicate Salpa aspera had the highest individual FPC production rate (7.5 μgFPC ind −1 h −1 ) and when present, contributed most to community FPC production (up to 82.3%). While the large copepod Neocalanus cristatus dominated the 2.0-5.0 mm fraction (up to~100% by biomass), its FPC production rate was low (0.4 μgFPC mgDW −1 h −1 ), likely due to minimal feeding and gut shrinkage preceding diapause. Comparison of FPC production with export recorded in sediment traps suggests high attenuation of smaller pellet classes in the epipelagic (86%). Our results provide direct measurements of mesozooplankton FPC production in a "low-production, low-export" region.

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Macroscale patterns of the biological cycling of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) in the Northwest Atlantic

et al. 2012

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Particulate organic carbon export in the upper twilight zone during the decline of the spring bloom

Cited by 13 publications

References 42 publications

Computation of primary production from remote sensing of ocean colour at the northwestern Atlantic C-SOLAS Lagrangian site

Computation of primary production from remote sensing of ocean colour at the northwestern Atlantic C-SOLAS Lagrangian site

Fecal pellet production by mesozooplankton in the subarctic Northeast Pacific Ocean

Macroscale patterns of the biological cycling of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) in the Northwest Atlantic

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