Quantifying the short-term temperature effect on light-saturated photosynthesis of intertidal microphytobenthos

Blanchard, G.F.; Guarini, Jean‐Marc; Richard, Pierre; Gros, Philippe; Mornet, Françoise

doi:10.3354/meps134309

Cited by 121 publications

(102 citation statements)

References 9 publications

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“…The significant variations of abundance and chl a concentration found in May 2008 and May 2009 are probably related to the difference in sediment surface temperature (difference between the two months: 11 C). In general, seasonal changes in intertidal systems subjected to large fluctuations of various environmental factors can mostly be explained by specific adaptations to light and temperature conditions (Cade´e & Hegeman, 1974;Grant, 1986;Blanchard et al, 1996;Barranguet et al, 1998). In the present investigation, the seasonal dynamics of the different MPB groups showed very similar patterns at the different stations (cf.…”

Section: à2supporting

confidence: 56%

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Scholz

Liebezeit

2012

European Journal of Phycology

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The microphytobenthos colonizing the intertidal flats forms an important component of the Wadden Sea. Ten sampling points along a 1-km transect were studied in a fringe area of the Soltho¨rn tidal flat, southern North Sea, in order to determine seasonal differences in the microphytobenthos. An accompanying paper deals with the major component of the flora, the diatoms; here we, focus on the minor taxonomic groups. From May 2008 to May 2009 surface sediments were collected during low tide. Variation of environmental factors as well as microphytobenthic density (abundance and chlorophyll a) were monitored. The area investigated was a mixed-sediment mudflat, with a gradient from coarse to fine. Highest biomass was obtained in summer 2008 with 215.9 AE 12.6 mg chlorophyll a m -2 . In late autumn the chlorophyll a concentration decreased continuously at all investigated stations. Lowest values were detected in December 2008. Species abundances varied considerably both along the transect and seasonally, depending on species-specific requirements as well as hydrodynamic conditions (tidal currents). Higher densities of benthic pro-and eukaryotic microalgae were observed in sites characterized by fine sediments. Apart from the diatoms, the most abundant microphytobenthic group was the cyanophytes. Coccoid cyanophytes, mainly Merismopedia sp., were most abundant during summer, with cell numbers up to 5.72 Â 10 6 cells cm À2, while diatoms dominated in winter, spring and autumn. Filamentous cyanophytes, particularly Microcoleus chthonoplastes, were most abundant during autumn, while coccoid chlorophytes (spring: Chlorococcum submarinum, Crucigenia tetrapedia, Tetraselmis suecica), euglenophytes (summer: Euglena obtusa), dinophytes (autumn: Amphidinium operculatum, A. herdmanii) and cryptophytes (autumn: Hillea marina, Hemiselmis virescens) contributed to the microphytobenthos during warmer seasons. The statistical analysis confirmed that the composition of the microphytobenthos was related to sediment features and to characteristics of particular seasons.

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Section: à2supporting

confidence: 56%

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Scholz

Liebezeit

2012

European Journal of Phycology

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“…In contrast, high irradiance levels did not correspond to an enhanced de-epoxidation state at the Eden estuary, where the de-epoxidation state was higher in winter than in summer. Temperature was possibly a factor that affected xanthophyll pigment cycling because temperatures decrease the rates of enzyme reactions (Grant, 1986;Blanchard et al, 1996). With metabolic processes slowing down, the energy demand of the cells will decrease.…”

Section: Discussionmentioning

confidence: 99%

Photoacclimation in microphytobenthos and the role of xanthophyll pigments

Leeuwe¹,

Brotas

Consalvey

et al. 2008

European Journal of Phycology

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Estuarine microphytobenthos are frequently exposed to excessively high irradiances. Photoinhibition in microalgae is prevented by various photophysiological responses. We describe here the role of the xanthophyll pigments in photoacclimation. The pigment composition of the microphytobenthos was studied in three European estuaries (Barrow, Ireland; Eden, UK; Tagus, Portugal). Using HPLC-analyses, microscale changes in biomass and pigment composition were monitored over short (hourly) and long (seasonal) time scales. In the Barrow estuary, the biomass of microphytobenthos (measured as chlorophyll a) increased significantly in the top 400-500 mm of the sediment surface within 1 h of emersion; simultaneously, the xanthophyll pool size (diadinoxanthin plus diatoxanthin, dd þ dt) almost doubled. A more gradual conversion of dd into dt was observed, with the dt:dd ratio increasing from <0.1 at the start of emersion to >0.3 after 3 h emersion. Similar trends in the dt:dd ratio were observed in the surface sediments of the Eden and the Tagus estuaries. Higher ratios were recorded in the Tagus estuary, which may be explained by higher incident irradiance. In addition, seasonal studies carried out in the Eden and Tagus estuaries showed that the xanthophyll pool size increased by 10% in the summer months. The pool size was highest in the Tagus estuary. Concurrently, high values for the de-epoxidation state were recorded, with values for dt/(dt þ dd) > 0.35 recorded in the summer. At the Eden, the ratio never exceeded 0.3. The de-epoxidation state was higher in winter than in summer, which was ascribed to the low winter temperatures. During a vertical migration study, a negative relationship between chlorophyll a and the de-epoxidation state was observed. It is suggested that this relationship originates from 'micro-migration' within the biofilm. Migration within the euphotic zone may provide an alternative means for cells to escape photodamage. In this paper, we propose that both xanthophyll cycling and 'micro'-migration play an important role in photoacclimation and it appears that these processes operate in parallel to regulate the photosynthetic response.

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“…This generally accepted scheme categorises the gross photosynthetic response for both Nivå Bay and the Trondheimsfjord as psychrotrophic. Studies from the Danish and Dutch Wadden Seas, applying other techniques, have shown lower-end mesophile temperature responses of gross photosynthesis, with T opt of 15 to 30°C (Colijn & van Buurt 1975, Rasmussen et al 1983, Blanchard et al 1996.…”

Section: Phototrophic Temperature Responsementioning

confidence: 99%

“…In shallow waters, both variables change on a seasonal and a diel basis superimposed by tidal and weather-driven variations, all having an impact on the benthic microbial activity (Grant 1986, Cahoon 1999, Glud et al 2002. Studies at subtidal and intertidal sites have shown that temperature can exert tight control on benthic photosynthetic rates, and can lead to seasonal acclimation and/or change in the microphytobenthic community composition (Rasmussen et al 1983, Grant 1986, Blanchard et al 1996, Barranguet et al 1998. Temperature acclimation usually describes phenotypic changes in a community as a response to short-term temperature change, whereas temperature adaptation involves genetic differences in metabolism between communities from different thermal environments (Berry & Bjorkman 1980, Davison 1991.…”

Section: Introductionmentioning

confidence: 99%

“…Temperature acclimation usually describes phenotypic changes in a community as a response to short-term temperature change, whereas temperature adaptation involves genetic differences in metabolism between communities from different thermal environments (Berry & Bjorkman 1980, Davison 1991. Temperature adaptation in microorganisms has typically been studied in cultures or in sediment slurries placed in benches at well-defined temperatures (Blanchard et al 1996, Isaksen & Jørgensen 1996, Thamdrup & Fleischer 1998. Based on data for minimum, optimum and maximum temperatures of the activity, the organisms are divided into groups, such as psychrophile, mesophile and thermophile, that tolerate low, medium and high temperatures, respectively (Davison 1991).…”

Section: Introductionmentioning

confidence: 99%

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Temperature effects on respiration and photosynthesis in three diatom-dominated benthic communities

Hancke¹,

Glud²

2004

Aquat. Microb. Ecol.

121

113

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Short-term temperature effects on respiration and photosynthesis were investigated in intact diatom-dominated benthic communities, collected at 2 temperate and 1 high-arctic subtidal sites. Areal rates of total (TOE) and diffusive (DOE) O 2 exchange were determined from O 2 -microsensor measurements in intact sediment cores in the temperature range from 0 to 24°C in darkness and at 140 µmol photons m -2 s -1 . In darkness, the O 2 consumption increased exponentially with increasing temperature for both TOE and DOE, and no optimum temperature was observed within the applied temperature range. Q 10 was calculated from the linear slope in Arrhenius plots and ranged between 1.7 and 3.3 at the respective sites. The volume-specific rate (R dark,vol ) solely representing the biological temperature response was somewhat stronger, with Q 10 values of 2.6 to 5.2. The Q 10 values were overall not correlated to the in situ water temperature or geographical position. Accordingly, no difference in the temperature acclimation or adaptation strategy of the microbial community was observed. Slurred oxic sediment samples showed a Q 10 of 1.7 and were, hence, lower than estimates based on intact sediment core measurements. This can be ascribed to changes in physical and biological controls during resuspension. Gross photosynthesis was measured with the light-dark shift method at the 2 temperate sites. Both areal (P gross ) and volumetric (P gross,vol ) rates increased with temperature to an optimum temperature at 12 and 15°C, with a Q 10 for P gross of 2.2 and 2.6 for the 2 sites, respectively. The gross photosynthesis response could be categorised as psychrotrophic for both sites and no temperature adaptation was observed between the 2 sites. Our measurements document that temperature stimulates heterotrophic activity more than gross photosynthesis, and that the benthic communities gradually become heterotrophic with increasing temperature. This has implications for C-cycling in shallow water communities experiencing seasonal and diel temperature fluctuations.

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Quantifying the short-term temperature effect on light-saturated photosynthesis of intertidal microphytobenthos

Cited by 121 publications

References 9 publications

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Photoacclimation in microphytobenthos and the role of xanthophyll pigments

Temperature effects on respiration and photosynthesis in three diatom-dominated benthic communities

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