Effects of temperature on photosynthetic parameters and TEP production in eight species of marine microalgae

Claquin, Pascal; Probert, Ian; Lefebvre, Sébastien; Véron, Benoı̂t

doi:10.3354/ame01187

Cited by 181 publications

(174 citation statements)

References 39 publications

(61 reference statements)

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“…In line with this, the analysis of the composition of the dcCHO pool for the AQ2 experiment showed a predominant accumulation of combined glucose )that is a main storage component of algal cells. While a stimulating effect of warming on primary production and the release of carbonrich compounds has also been reported from other studies (Verity 1981;Davison 1991;Wolfstein et al 2002;Morán et al 2006;Claquin et al 2008), the here determined rates of dissolved PP, however, either showed a negative (AQ2; Fig. 2) or no response to rising temperature (AQ5, AQ6; Fig.…”

Section: Temporal Dynamics Of Bloom Developmentmentioning

confidence: 58%

“…2). Similarly, a stimulation of TEP production and aggregation by rising temperature has been previously reported for various monoalgal cultures (Thornton and Thake 1998;Claquin et al 2008). In AQ5, this first peak was followed by a decline in TEP under in situ temperature conditions, whereas the concentration further increased in the postbloom phase of the elevated temperature treatments, thus yielding an overall significant temperature response (Table 5; Fig.…”

Section: Tep Dynamicsmentioning

confidence: 78%

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Effects of rising temperature on pelagic biogeochemistry in mesocosm systems: a comparative analysis of the AQUASHIFT Kiel experiments

et al. 2012

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A comparative analysis of data, obtained during four indoor-mesocosm experiments with natural spring plankton communities from the Baltic Sea, was conducted to investigate whether biogeochemical cycling is affected by an increase in water temperature of up to 6°C above present-day conditions. In all experiments, warming stimulated in particular heterotrophic bacterial processes and had an accelerating effect on the temporal development of phytoplankton blooms. This was also mirrored in the build-up and partitioning of organic matter between particulate and dissolved phases.Thus, warming increased both the magnitude and rate of dissolved organic carbon (DOC) build-up, whereas the accumulation of particulate organic carbon (POC) and phosphorus (POP) decreased with rising temperature. In concert, the observed temperature-mediated changes in biogeochemical components suggest strong shifts in the functioning of marine pelagic food webs and the ocean's biological carbon pump, hence providing potential feedback mechanisms to Earth's climate system.

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Section: Temporal Dynamics Of Bloom Developmentmentioning

confidence: 58%

Section: Tep Dynamicsmentioning

confidence: 78%

Effects of rising temperature on pelagic biogeochemistry in mesocosm systems: a comparative analysis of the AQUASHIFT Kiel experiments

et al. 2012

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“…Field observations showed that cyanobiont cells concentrate in the center of Trichodesmium colonies, and cell motility would indicate that the hetDA cells preferentially inhabits this niche within the colony. It is well known that algae can release significant amounts of recently fixed carbon as molecules and polymers that fall into both the dissolved or particulate phases, and Trichodesmium is no exception (e.g., Nagata, 2000;Berman-Frank et al, 2007;Claquin et al, 2008). In Trichodesmium, this carbon (and presumably N) supports a wide array of heterotrophic organisms (Paerl and Bebout, 1989;Hmelo et al, 2012) with activities so significant that the center of the colonies can go anoxic (Paerl and Bebout, 1988) and even allow the growth of active denitrifying bacteria (Wyman et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

A novel cohabitation between two diazotrophic cyanobacteria in the oligotrophic ocean

et al. 2014

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The cyanobacterial genus Trichodesmium is biogeochemically significant because of its dual role in nitrogen and carbon fixation in the oligotrophic ocean. Trichodesmium species form colonies that can be easily enriched from the water column and used for shipboard rate measurements to estimate their contribution to oceanic carbon and nitrogen budgets. During a July 2010 cruise near the Hawaiian Islands in the oligotrophic North Pacific Subtropical Gyre, a specific morphology of Trichodesmium puff-form colonies were examined under epifluorescent microscopy and found to harbor a colonial endobiont, morphologically identified as the heterocystous diazotrophic cyanobacterium Calothrix. Using unialgal enrichments obtained from this cruise, we show that these Calothrix-like heterocystous cyanobionts (hetDA for 'Trichodesmium-associated heterocystous diazotroph') fix nitrogen on a diurnal cycle (maximally in the middle of the light cycle with a detectable minimum in the dark). Gene sequencing of nifH from the enrichments revealed that this genus was likely not quantified using currently described quantitative PCR (qPCR) primers. Guided by the sequence from the isolate, new hetDA-specific primers were designed and subsequent qPCR of environmental samples detected this diazotroph from surface water to a depth of 150 m, reaching densities up to B9 Â 10 3 l À 1 . Based on phylogenetic relatedness of nifH and 16S rRNA gene sequences, it is predicted that the distribution of this cyanobiont is not limited to subtropical North Pacific but likely reaches to the South Pacific and Atlantic Oceans. Therefore, this previously unrecognized cohabitation, if it reaches beyond the oligotrophic North Pacific, could potentially influence Trichodesmium-derived nitrogen fixation budgets in the world ocean.

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“…Aggregate formation at elevated temperature has been hypothesized to be due to sticky polymers on the surface of the diatoms (Thornton & Thake, 1998) or the production of TEP . Seven of eight phytoplankton species studied by Claquin et al (2008) produced more TEP with increasing temperature when grown in batch culture. The trend continued until a maximum TEP production rate was reached, with higher temperatures resulting in lower TEP production rates.…”

Section: Temperature and Stratificationmentioning

confidence: 99%

“…Exudation by phytoplankton plays a significant role in the formation of TEP (Passow, 2002b;Gärdes et al, 2011). Numerous studies have shown that exopolymer particles accumulate in phytoplankton cultures (Passow, 2002b;Claquin et al, 2008;Fukao et al, 2010) and during blooms (Passow et al, 1994;Engel et al, 2002;Engel, 2004;Harlay et al, 2009) (Figs 3,5). Generally, TEP are not exuded directly by phytoplankton cells; they form abiotically from precursors released by cells.…”

Section: 4mentioning

confidence: 99%

Dissolved organic matter (DOM) release by phytoplankton in the contemporary and future ocean

Thornton

2014

European Journal of Phycology

365

311

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The partitioning of organic matter (OM) between dissolved and particulate phases is an important factor in determining the fate of organic carbon in the ocean. Dissolved organic matter (DOM) release by phytoplankton is a ubiquitous process, resulting in 2-50% of the carbon fixed by photosynthesis leaving the cell. This loss can be divided into two components: passive leakage by diffusion across the cell membrane and the active exudation of DOM into the surrounding environment. At present there is no method to distinguish whether DOM is released via leakage or exudation. Most explanations for exudation remain hypothetical; as while DOM release has been measured extensively, there has been relatively little work to determine why DOM is released. Further research is needed to determine the composition of the DOM released by phytoplankton and to link composition to phytoplankton physiological status and environmental conditions. For example, the causes and physiology of phytoplankton cell death are poorly understood, though cell death increases membrane permeability and presumably DOM release. Recent work has shown that phytoplankton interactions with bacteria are important in determining both the amount and composition of the DOM released. In response to increasing CO 2 in the atmosphere, climate change is creating increasingly stressful conditions for phytoplankton in the surface ocean, including relatively warm water, low pH, low nutrient supply and high light. As ocean physics and chemistry change, it is hypothesized that a greater proportion of primary production will be released directly by phytoplankton into the water as DOM. Changes in the partitioning of primary production between the dissolved and particulate phases will have bottom-up effects on ecosystem structure and function. There is a need for research to determine how these changes affect the fate of organic matter in the ocean, particularly the efficiency of the biological carbon pump.

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Effects of temperature on photosynthetic parameters and TEP production in eight species of marine microalgae

Cited by 181 publications

References 39 publications

Effects of rising temperature on pelagic biogeochemistry in mesocosm systems: a comparative analysis of the AQUASHIFT Kiel experiments

Effects of rising temperature on pelagic biogeochemistry in mesocosm systems: a comparative analysis of the AQUASHIFT Kiel experiments

A novel cohabitation between two diazotrophic cyanobacteria in the oligotrophic ocean

Dissolved organic matter (DOM) release by phytoplankton in the contemporary and future ocean

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