Effect of growth temperature on photosynthetic capacity and respiration in three ecotypes of Eriophorum vaginatum
Schedlbauer, Jessica L.
Moody, Michael L.
MetadataShow full item record
KeywordAdaptational lag; Eriophorum vaginatum; Moist tussock tundra; Photosynthetic capacity; Respiration; Temperature acclimation
Ecotypic differentiation in the tussock‐forming sedge Eriophorum vaginatum has led to the development of populations that are locally adapted to climate in Alaska's moist tussock tundra. As a foundation species, E. vaginatum plays a central role in providing topographic and microclimatic variation essential to these ecosystems, but a changing climate could diminish the importance of this species. As Arctic temperatures have increased, there is evidence of adaptational lag in E. vaginatum, as locally adapted ecotypes now exhibit reduced population growth rates. Whether there is a physiological underpinning to adaptational lag is unknown. Accordingly, this possibility was investigated in reciprocal transplant gardens. Tussocks of E. vaginatum from sites separated by ~1° latitude (Coldfoot: 67°15′N, Toolik Lake: 68°37′, Sagwon: 69°25′) were transplanted into the Toolik Lake and Sagwon sites and exposed to either an ambient or an experimental warming treatment. Five tussocks pertreatment combination were measured at each garden to determine photosynthetic capacity (i.e., Vcmax and Jmax) and dark respiration rate (Rd) at measurement temperatures of 15, 20, and 25°C. Photosynthetic enhancements or homeostasis were observed for all ecotypes at both gardens under increased growth temperature, indicating no negative effect of elevated temperature on photosynthetic capacity. Further, no evidence of thermal acclimation in Rd was observed for any ecotype, and there was little evidence of ecotypic variation in Rd. As such, no physiological contribution to adaptational lag was observed given the increase in growth temperature (up to ~2°C) provided by this study. Despite neutral to positive effects of increased growth temperature on photosynthesis in E. vaginatum, it appears to confer no lasting advantage to the species.
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Ecology and Evolution 8 (2018): 3711-3725, doi:10.1002/ece3.3939.
Suggested CitationEcology and Evolution 8 (2018): 3711-3725
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Response of dark respiration to temperature in Eriophorum vaginatum from a 30-year-old transplant experiment in Alaska van de Weg, Martine J.; Fetcher, Ned; Shaver, Gaius R. (2012-09)Background: In the Arctic region, temperature increases are expected to be greater under anticipated climate change than the global average. Understanding how dark respiration (Rd) of common Arctic plant species acclimates ...
Effect of continuous light on leaf wax isotope ratios in Betula nana and Eriophorum vaginatum: Implications for Arctic paleoclimate reconstructions Daniels, William C.; Huang, Yongsong; Russell, James M.; Giblin, Anne E. (Elsevier B.V., 2018-08-22)Reconstructions of climate using leaf wax D/H ratios (δDwax) require accounting for the apparent isotopic fractionation (εapp) between plant source water and waxes. There have been conflicting publications on whether plants ...
Ecotypic differences in the phenology of the tundra species Eriophorum vaginatum reflect sites of origin Parker, Thomas C.; Tang, Jianwu; Clark, Mahalia B.; Moody, Michael L.; Fetcher, Ned (John Wiley & Sons, 2017-10-19)Eriophorum vaginatum is a tussock-forming sedge that contributes significantly to the structure and primary productivity of moist acidic tussock tundra. Locally adapted populations (ecotypes) have been identified across ...