Journal Article

The response of forest plant regeneration to temperature variation along a latitudinal gradient

Pieter De Frenne, Bente J. Graae, Jörg Brunet, Anna Shevtsova, An De Schrijver, Olivier Chabrerie, Sara A. O. Cousins, Guillaume Decocq, Martin Diekmann, Martin Hermy, Thilo Heinken, Annette Kolb, Christer Nilsson, Sharon Stanton and Kris Verheyen

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 109, issue 5, pages 1037-1046
Published in print April 2012 | ISSN: 0305-7364
Published online February 2012 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcs015
The response of forest plant regeneration to temperature variation along a latitudinal gradient

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background and Aims

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.

Methods

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.

Key Results

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.

Conclusions

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.

Keywords: Anemone nemorosa; climate change; common garden; growth chambers; latitudinal gradient; local adaptation; Milium effusum; plant regeneration; range edges; recruitment; seedling establishment; temperature

Journal Article.  5871 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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