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Publication Type J
Authors Gagne, J. M. and G. Houle
Title Factors responsible for Honckenya peploides (Caryophyllaceae) and Leymus mollis (Poaceae) spatial segregation on subarctic coastal dunes
Source American Journal of Botany
Author Keywords beach abrasion, caryophyllaceae coastal dunes Honckenya peploides Leymus mollis plant succession Poaceae sand burial zonation sand burial salt spray ammophila-breviligulata calamovilfa-longifolia seed-germination growth survival establishment seedlings salinity
Abstract Low water and nutrient availability and significant sand movement, salt spray, and soil salinity are typical of coastal dunes. These conditions are generally unfavorable for the various life stages of plants and especially for seedlings. However, the intensity of these stresses decreases landward, even over short distances, with significant effects on community composition. On coastal dunes in subarctic Quebec, Canada, Honckenya peploides (Caryophyllaceae) colonizes the upper beach where it forms small mounds called embryo dunes. Leymus mollis (Poaceae) is mostly restricted to the foredune; however, a few individuals successfully establish on the upper beach, particularly on embryo dunes We hypothesized that this differential distribution is associated with differences in the tolerance of the two species' seedlings to physical stresses. Honckenya peploides and L. mollis seedling tolerance to sand burial, salt spray, soil salinity, and nutrient and water availability was assessed in greenhouse experiments. Unexpectedly, our results showed that tolerance to sand burial, salt spray, and soil salinity was lower for H. peploides than for L. mollis. If seeds are available and seedlings tolerate the conditions prevailing on the upper beach well, why are mature L. mollis individuals rare in this habitat? We suggest that massive abrasion events (e.g., violent storm waves and ice thrust) restrict the presence of the species on the upper beach.
Author Address Univ Laval, Dept Biol, St Foy, PQ G1K 7P4, Canada. Univ Laval, Ctr Etudes Nord, St Foy, PQ G1K 7P4, Canada. Houle, G (reprint author), Univ Laval, Dept Biol, St Foy, PQ G1K 7P4, Canada.
ISSN 0002-9122
ISBN 0002-9122
29-Character Source Abbreviation Am. J. Bot.
Publication Date Mar
Year Published 2002
Volume 89
Issue 3
Beginning Page 479-485
Digital Object Identifier (DOI) 10.3732/ajb.89.3.479
Unique Article Identifier WOS:000178098300014
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