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The response of forest plant regeneration to temperature variation along a latitudinal gradient
Department of Biology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
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2012 (English)In: Annals of Botany, ISSN 0305-7364, E-ISSN 1095-8290, Vol. 109, no 5, 1037-1046 p.Article in journal (Refereed) Published
Abstract [en]

The response of forest herb regeneration from seed to temperature variations across latitudes was experimentally assessed in order to forecast the likely response of understorey community dynamics to climate warming. Seeds of two characteristic forest plants (Anemone nemorosa and Milium effusum) were collected in natural populations along a latitudinal gradient from northern France to northern Sweden and exposed to three temperature regimes in growth chambers (first experiment). To test the importance of local adaptation, reciprocal transplants were also made of adult individuals that originated from the same populations in three common gardens located in southern, central and northern sites along the same gradient, and the resulting seeds were germinated (second experiment). Seedling establishment was quantified by measuring the timing and percentage of seedling emergence, and seedling biomass in both experiments. Spring warming increased emergence rates and seedling growth in the early-flowering forb A. nemorosa. Seedlings of the summer-flowering grass M. effusum originating from northern populations responded more strongly in terms of biomass growth to temperature than southern populations. The above-ground biomass of the seedlings of both species decreased with increasing latitude of origin, irrespective of whether seeds were collected from natural populations or from the common gardens. The emergence percentage decreased with increasing home-away distance in seeds from the transplant experiment, suggesting that the maternal plants were locally adapted. Decreasing seedling emergence and growth were found from the centre to the northern edge of the distribution range for both species. Stronger responses to temperature variation in seedling growth of the grass M. effusum in the north may offer a way to cope with environmental change. The results further suggest that climate warming might differentially affect seedling establishment of understorey plants across their distribution range and thus alter future understorey plant dynamics.

Place, publisher, year, edition, pages
Oxford University Press, 2012. Vol. 109, no 5, 1037-1046 p.
Keyword [en]
Anemone nemorosa, climate change, common garden, growth chambers, latitudinal gradient, local adaptation, Milium effusum, plant regeneration, range edges, recruitment, seedling establishment, temperature
National Category
Botany
Identifiers
URN: urn:nbn:se:umu:diva-54323DOI: 10.1093/aob/mcs015ISI: 000301971900020OAI: oai:DiVA.org:umu-54323DiVA: diva2:518269
Available from: 2012-04-24 Created: 2012-04-24 Last updated: 2017-12-07Bibliographically approved

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Shevtsova, AnnaNilsson, Christer
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