Resilience to temperature and pH changes in a future climate change scenario in six strains of the polar diatom Fragilariopsis cylindrus
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Resilience to temperature and pH changes in a future climate change scenario in six strains of the polar diatom Fragilariopsis cylindrus. / Pančić, Marina; Hansen, Per Juel; Tammilehto, Anna; Lundholm, Nina.
In: Biogeosciences, Vol. 12, 12, 2015, p. 4235-4244 .Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Resilience to temperature and pH changes in a future climate change scenario in six strains of the polar diatom Fragilariopsis cylindrus
AU - Pančić, Marina
AU - Hansen, Per Juel
AU - Tammilehto, Anna
AU - Lundholm, Nina
PY - 2015
Y1 - 2015
N2 - Abstract. The effects of ocean acidification and increasedtemperature on physiology of six strains of the polar diatomFragilariopsis cylindrus from Greenland were investigated.Experiments were performed under manipulated pH levels(8.0, 7.7, 7.4, and 7.1) and different temperatures (1, 5, and8 C) to simulate changes from present to plausible futurelevels. Each of the 12 scenarios was run for 7 days, and a significantinteraction between temperature and pH on growthwas detected. By combining increased temperature and acidification,the two factors counterbalanced each other, andtherefore no effect on the growth rates was found. However,the growth rates increased with elevated temperaturesby 20–50% depending on the strain. In addition, a generalnegative effect of increasing acidification on growth was observed.At pH 7.7 and 7.4, the growth response varied considerablyamong strains. However, a more uniform response wasdetected at pH 7.1 with most of the strains exhibiting reducedgrowth rates by 20–37% compared to pH 8.0. It should beemphasized that a significant interaction between temperatureand pH was found, meaning that the combination of thetwo parameters affected growth differently than when consideringone at a time. Based on these results, we anticipatethat the polar diatom F. cylindrus will be unaffected bychanges in temperature and pH within the range expected bythe end of the century. In each simulated scenario, the variationin growth rates among the strains was larger than thevariation observed due to the whole range of changes in eitherpH or temperature. Climate change may therefore notaffect the species as such, but may lead to changes in thepopulation structure of the species, with the strains exhibitinghigh phenotypic plasticity, in terms of temperature andpH tolerance towards future conditions, dominating the population.
AB - Abstract. The effects of ocean acidification and increasedtemperature on physiology of six strains of the polar diatomFragilariopsis cylindrus from Greenland were investigated.Experiments were performed under manipulated pH levels(8.0, 7.7, 7.4, and 7.1) and different temperatures (1, 5, and8 C) to simulate changes from present to plausible futurelevels. Each of the 12 scenarios was run for 7 days, and a significantinteraction between temperature and pH on growthwas detected. By combining increased temperature and acidification,the two factors counterbalanced each other, andtherefore no effect on the growth rates was found. However,the growth rates increased with elevated temperaturesby 20–50% depending on the strain. In addition, a generalnegative effect of increasing acidification on growth was observed.At pH 7.7 and 7.4, the growth response varied considerablyamong strains. However, a more uniform response wasdetected at pH 7.1 with most of the strains exhibiting reducedgrowth rates by 20–37% compared to pH 8.0. It should beemphasized that a significant interaction between temperatureand pH was found, meaning that the combination of thetwo parameters affected growth differently than when consideringone at a time. Based on these results, we anticipatethat the polar diatom F. cylindrus will be unaffected bychanges in temperature and pH within the range expected bythe end of the century. In each simulated scenario, the variationin growth rates among the strains was larger than thevariation observed due to the whole range of changes in eitherpH or temperature. Climate change may therefore notaffect the species as such, but may lead to changes in thepopulation structure of the species, with the strains exhibitinghigh phenotypic plasticity, in terms of temperature andpH tolerance towards future conditions, dominating the population.
U2 - 10.5194/bg-12-4235-2015
DO - 10.5194/bg-12-4235-2015
M3 - Journal article
VL - 12
SP - 4235
EP - 4244
JO - Biogeosciences
JF - Biogeosciences
SN - 1726-4170
M1 - 12
ER -
ID: 132772570