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| Titel |
Resilience to temperature and pH changes in a future climate change scenario in six strains of the polar diatom Fragilariopsis cylindrus |
| VerfasserIn |
M. Pančić, P. J. Hansen, A. Tammilehto, N. Lundholm |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 14 ; Nr. 12, no. 14 (2015-07-20), S.4235-4244 |
| Datensatznummer |
250118026
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| Publikation (Nr.) |
 copernicus.org/bg-12-4235-2015.pdf |
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| Zusammenfassung |
| The effects of ocean acidification and increased temperature on physiology
of six strains of the polar diatom Fragilariopsis 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, and 8 °C) to simulate
changes from present to plausible future levels. Each of the 12 scenarios
was run for 7 days, and a significant interaction between temperature and pH on growth was detected. By combining increased temperature and
acidification, the two factors counterbalanced each other, and therefore no
effect on the growth rates was found. However, the growth rates increased
with elevated temperatures by ~ 20–50 % depending on the
strain. In addition, a general negative effect of increasing acidification
on growth was observed. At pH 7.7 and 7.4, the growth response varied
considerably among strains. However, a more uniform response was detected at
pH 7.1 with most of the strains exhibiting reduced growth rates by
20–37 % compared to pH 8.0. It should be emphasized that a significant
interaction between temperature and pH was found, meaning that the
combination of the two parameters affected growth differently than when
considering one at a time. Based on these results, we anticipate that the
polar diatom F. cylindrus will be unaffected by changes in temperature and pH within the
range expected by the end of the century. In each simulated scenario, the
variation in growth rates among the strains was larger than the variation
observed due to the whole range of changes in either pH or temperature.
Climate change may therefore not affect the species as such, but may lead to
changes in the population structure of the species, with the strains
exhibiting high phenotypic plasticity, in terms of temperature and pH tolerance towards future conditions, dominating the population. |
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