Resilience by diversity: Large intraspecific differences in climate change responses of an Arctic diatom


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klara.wolf [ at ] awi.de

Abstract

The potential for adaptation of phytoplankton to future climate is often extrapolated based on single strain responses of a representative species, ignoring variability within and between species. The aim of this study was to approximate the range of strain-specific reaction patterns within an Arctic diatom population, which selection can act upon. In a laboratory experiment, we first incubated natural communities from an Arctic fjord under present and future conditions. In a second step, single strains of the diatom Thalassiosira hyalina were isolated from these selection environments and exposed to a matrix of temperature (38C and 68C) and pCO 2 levels (180 latm, 370 latm, 1000 latm, 1400 latm) to establish reaction norms for growth, production rates, and elemental quotas. The results revealed interactive effects of temperature and pCO 2 as well as wide tolerance ranges. Between strains, however, sensitivities and optima differed greatly. These strain-specific responses corresponded well with their respective selection environments of the previous com- munity incubation. We therefore hypothesize that intraspecific variability and the selection between coexist- ing strains may pose an underestimated source of species’ plasticity. Thus, adaptation of phytoplankton assemblages may also occur by selection within rather than only between species, and species-wide inferences from single strain experiments should be treated with caution.



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ISI/Scopus peer-reviewed
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Published
Eprint ID
48036
DOI 10.1002/lno.10639

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Wolf, K. K. E. , Hoppe, C. J. M. and Rost, B. (2018): Resilience by diversity: Large intraspecific differences in climate change responses of an Arctic diatom , Limnology and Oceanography, 63 (1), pp. 397-411 . doi: 10.1002/lno.10639


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