Effect of Irradiance and Temperature on Photosynthesis and Growth of Two Antarctic Benthic Diatoms, Gyrosigma subsalinum and Odontella litigiosa

Longhi, Maria Lorena; Schloss, Irene R; Wiencke, Christian

doi:10.1515/bot.2003.025

Cited by 33 publications

(35 citation statements)

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“…Therefore, both taxa from Kongsfjorden can be characterised as eurythermal organisms. This is in contrast to Antarctic benthic diatoms which showed maximum growth at 0°C and full inhibition of cell division already at 7-9°C (Longhi et al 2003). Consequently, the studied Antarctic microphytobenthic taxa are characterised as polar stenothermal organisms.…”

Section: Discussionmentioning

confidence: 68%

“…Particularly endemic algae have evolved various physiological and biochemical adaptations to low temperatures (Wiencke et al 1994). While the Antarctic benthic diatom taxa investigated by Longhi et al (2003) are characterised as endemic species, which well explains the low temperature demands for growth, the respective information on both strains from the Arctic is still missing due to some unresolved taxonomic problems. However, as already mentioned above, it seems highly unlikely to expect epiphytic diatoms endemic to the Arctic.…”

Section: Discussionmentioning

confidence: 99%

“…Similar results were reported for Antarctic benthic diatoms. Gyrosigma subsalinum exhibited saturated growth at 11.4 lmol photons m À2 s À1 (Longhi et al 2003), and Amphora antarctica and Trachyneis aspera grew also best under very similar conditions at 10-15 lmol photons m À2 s À1 (Rivkin and Putt 1987). However, while these authors documented maximum cell divisions for the Antarctic benthic diatoms in the range of 0.25-0.4 day À1 under optimum photon fluence rates, both Arctic strains grew much faster under similar conditions with growth rates of 0.9-1.2 day À1 .…”

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confidence: 99%

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Temperature and light requirements for growth of two diatom species (Bacillariophyceae) isolated from an Arctic macroalga

et al. 2005

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In the present study, two abundant epiphytic diatom taxa were isolated from the assimilation hairs of the brown macroalga Chordaria flagelliformis collected in the Arctic Kongsfjorden (Spitsbergen, Norway), established as unialgal cultures and their growth rates determined under controlled photon fluence rate and temperature conditions. Using morphological (light and scanning electron microscopy) and SSU rRNA gene data both isolates (ROS D99 and ROS D125) were identified as members of a Fragilaria-Synedropsis clade. The molecular data of ROS D99 and ROS D125 were not identical to any other published sequence. While ROS D99 has been identified as Fragilaria barbararum mainly due to the SEM characteristics, ROS D125 could not be definitely identified although morphological data speak for Fragilaria striatula. Both diatom species showed similar growth rates at all temperatures and photon fluence rates tested. They grew well between 0 and 15°C with optimum temperatures of 12-14°C, but did not survive 20°C. Therefore, compared to Antarctic diatoms both taxa from Kongsfjorden can be characterised as eurythermal organisms. Increasing photon fluence rates between 2 and 15 lmol m À2 s À1 were accompanied with an almost twofold increase in growth rates, but photon fluence rates >15 lmol m À2 s À1 did not further enhance growth pointing to low light requirements. From these data optimum, minimum and maximum photon fluence rates and temperatures for growth can be assessed indicating that both diatoms are well acclimated to the fluctuating environmental conditions in the Arctic habitat.

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Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Temperature and light requirements for growth of two diatom species (Bacillariophyceae) isolated from an Arctic macroalga

et al. 2005

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“…According to Experiment B, optimal growth temperature for N. lecointei was around 5 • C. It has previously been suggested that maximal growth rate occurs at temperatures above in situ levels (Fiala and Oriol, 1990;Longhi et al, 2003), which indicates that a narrow thermal window generally limits Antarctic microalgae. This suggests that carbon enrichment might not be beneficial at ambient conditions since temperature primarily regulates growth.…”

Section: Discussionmentioning

confidence: 86%

Synergism between elevated pCO2 and temperature on the Antarctic sea ice diatom Nitzschia lecointei

et al. 2013

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Abstract. Polar oceans are particularly susceptible to ocean acidification and warming. Diatoms play a significant role in sea ice biogeochemistry and provide an important food source to grazers in ice-covered oceans, especially during early spring. However, the ecophysiology of ice-living organisms has received little attention in terms of ocean acidification. In this study, the synergism between temperature and partial pressure of CO 2 (pCO 2 ) was investigated in relationship to the optimal growth temperature of the Antarctic sea ice diatom Nitzschia lecointei. Diatoms were kept in cultures at controlled levels of pCO 2 (∼ 390 and ∼ 960 µatm) and temperature (−1.8 and 2.5 • C) for 14 days. Synergism between temperature and pCO 2 was detected in growth rate and acyl lipid fatty acid (FA) content. Optimal growth rate was observed around 5 • C in a separate experiment. Carbon enrichment only promoted (6 %) growth rate closer to the optimal growth, but not at the control temperature (−1.8 • C). At −1.8 • C and at ∼ 960 µatm pCO 2 , the total FA content was reduced relative to the ∼ 390 µatm treatment, although no difference between pCO 2 treatments was observed at 2.5 • C. A large proportion (97 %) of the total FAs comprised on average of polyunsaturated fatty acids (PUFA) at −1.8 • C. Cellular PUFA content was reduced at ∼ 960 relative to ∼ 390 µatm pCO 2 . Effects of carbon enrichment may be different depending on ocean warming scenario or season, e.g. reduced cellular FA content in response to elevated CO 2 at low temperatures only, reflected as reduced food quality for higher trophic levels. Synergy between warming and acidification may be particularly important in polar areas since a narrow thermal window generally limits cold-water organisms.

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“…3). Consequently, they can be characterized as temperate eurythermal organisms, in contrast to stenothermal microalgae like, for example, Antarctic or Arctic diatoms (Suzuki & Takahashi 1995), some of which showed maximum growth at 0°C and full inhibition of cell division above 7°C (Longhi et al 2003). The haptophyte Isochrysis aff.…”

Section: Discussionmentioning

confidence: 99%

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

Claquin¹,

Probert²,

Lefebvre³

et al. 2008

Aquat. Microb. Ecol.

181

138

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Effect of Irradiance and Temperature on Photosynthesis and Growth of Two Antarctic Benthic Diatoms, Gyrosigma subsalinum and Odontella litigiosa

Cited by 33 publications

References 33 publications

Temperature and light requirements for growth of two diatom species (Bacillariophyceae) isolated from an Arctic macroalga

Temperature and light requirements for growth of two diatom species (Bacillariophyceae) isolated from an Arctic macroalga

Synergism between elevated <i>p</i>CO<sub>2</sub> and temperature on the Antarctic sea ice diatom <i>Nitzschia lecointei</i>

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

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Effect of Irradiance and Temperature on Photosynthesis and Growth of Two Antarctic Benthic Diatoms, Gyrosigma subsalinum and Odontella litigiosa

Cited by 33 publications

References 33 publications

Temperature and light requirements for growth of two diatom species (Bacillariophyceae) isolated from an Arctic macroalga

Temperature and light requirements for growth of two diatom species (Bacillariophyceae) isolated from an Arctic macroalga

Synergism between elevated &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and temperature on the Antarctic sea ice diatom &lt;i&gt;Nitzschia lecointei&lt;/i&gt;

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

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Synergism between elevated <i>p</i>CO<sub>2</sub> and temperature on the Antarctic sea ice diatom <i>Nitzschia lecointei</i>