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1 August 2003 Germination ecology of the clonal herb Knautia arvensis: Regeneration strategy and geographic variation
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Abstract

We investigated germination responses and seed recruitment in the clonal grassland herb Knautia arvensis (Dipsacaceae) throughout its distributional range in Norway. Four predicted relationships between germination responses and field regeneration behaviour were tested using phytotron experiments and experimental and observational field studies. Seedlings appeared in all experimental microsites in the field, corroborating phytotron predictions that gap- or depth-sensing strategies should be absent in the species. Seasonal timing patterns were predicted from a cold stratification response in the phytotron, but these were not supported in the field. The relationship between dormancy, germinability during storage, and seed carry-over in the field largely conformed to expectations. Seeds from four different geographical regions responded differently to temperature and cold stratification and storage. Dormancy and seed carry-over was higher in seeds from a coastal population, where winters are relatively mild and the probability of repeated freeze-thaw events is high, than in populations from mountain and inland areas, where winters are colder. This is discussed against two alternative hypotheses about the relationship between climate and dormancy in seasonal climates.

Nomenclature: Lid & Lid (1994).

Vigdis Vandvik and Vibekke Vange "Germination ecology of the clonal herb Knautia arvensis: Regeneration strategy and geographic variation," Journal of Vegetation Science 14(4), (1 August 2003). https://doi.org/10.1658/1100-9233(2003)014[0591:GEOTCH]2.0.CO;2
Received: 17 January 2002; Accepted: 1 March 2003; Published: 1 August 2003
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