The effects of winter stress on Sphagnum specieswith contrasting macro- and microdistributions [Elektronisk resurs]
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Campbell, Charles, 1982- (författare)
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Rydin, Håkan, 1953- (författare)
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Rydin (medarbetare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
- Publicerad: Taylor & Francis, 2019
- Engelska.
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Ingår i: Journal of Bryology. - 0373-6687. ; 41:3, 205-217
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Sammanfattning
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- Introduction: Sphagnum L. forms much of the ground cover in northern peatlands. Different species show affinities for bioclimatic regions in Europe (oceanic/continental; northern/southern) and species-specific tolerance of winter conditions can be a factor explaining their distribution. Methods: We focussed on low temperature in a series of experiments and tested (1) the innate ability of a selection of Sphagnum species to tolerate low temperature in relation to their micro-topographic (wetness) and geographical (climate) distribution; (2) the rate of cold tolerance acquisition; and (3) the ability of species to survive a range of low temperature once cold hardened. Key results: Our experiments showed that maximal PSII efficiency ( F v /F m , chlorophyll fluorescence), growth rates and survival were all negatively affected by sub-zero temperatures. Environmental conditions associated with the onset of winter (colder nights and shorter days) triggered the acquisition of cold tolerance in Sphagnum . Conclusions: The results were not unequivocal, but species associated with colder climates were generally more tolerant of sub-zero conditions. Species associated with the wettest and driest ends of the wetness gradient were more consistent in their responses than those in between, with wetter-dwelling species being less sensitive to sub-zero temperature than species found in drier microhabitats. Overall, our results suggest that adaptation to winter conditions contribute to the current distribution patterns of Sphagnum species.
Ämnesord
- Natural Sciences (hsv)
- Biological Sciences (hsv)
- Ecology (hsv)
- Naturvetenskap (hsv)
- Biologiska vetenskaper (hsv)
- Ekologi (hsv)
- Natural Sciences (hsv)
- Biological Sciences (hsv)
- Evolutionary Biology (hsv)
- Naturvetenskap (hsv)
- Biologiska vetenskaper (hsv)
- Evolutionsbiologi (hsv)
- Natural Sciences (hsv)
- Biological Sciences (hsv)
- Botany (hsv)
- Naturvetenskap (hsv)
- Biologiska vetenskaper (hsv)
- Botanik (hsv)
Genre
- government publication (marcgt)
Indexterm och SAB-rubrik
- Chlorophyll fluorescence
- cold tolerance
- species distribution
- Sphagnum
- winter
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