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Authors Imbert, E; Houle, G
Author Full Name Imbert, E; Houle, G
Title Persistence of colonizing plant species along an inferred successional sequence on a subarctic coastal dune (Quebec, Canada)
Source ECOSCIENCE
Language English
Document Type Article
Author Keywords Hudson Bay; coastal dunes; Lathyrus japonicus; Leymus mollis; persistence; subarctic; succession; toposequence
Keywords Plus SUB-ARCTIC QUEBEC; AMMOPHILA-ARENARIA; LEYMUS-ARENARIUS; SOIL ORGANISMS; NEW-ZEALAND; HUDSON-BAY; SAND DUNES; SYSTEM; POPULATIONS; VEGETATION
Abstract Coastal dune systems have been extensively studied in various parts of the world, but few investigations have been made in the Subarctic where temperatures remain relatively low during the short growing season. Here, we report the results of a study performed on a subarctic coastal dune system on the east coast of Hudson Bay, Canada. We determined the spatiotemporal dynamics of some important substrate characteristics, described the spatial dynamics of the vascular plant community, and followed temporal changes in the populations of the two major plant species, Leymus mollis (Poaceae) and Lathyrus japonicus (Fabaceae), along a toposequence, from the embryo dunes to the stabilized dune. Thr observed spatial changes in substrate characteristics were consistent with those reported in studies of lower-latitude dune systems, but they were generally of lesser magnitude. Thr subarctic climate appears to have unusual effects on me spatial gradient of substrate salinity and water content. For instance, salinity did not vary along the toposequence early in the season while the bay was still partly frozen, bur it showed a significant gradient during the summer, with lower salinity values on the stabilized dune. Life-form turnover. from the upper beach to the stabilized dune,was lower than what has been reported for lower-latitude dune systems because of the rarity of annual plant species. Although the density and biomass of Leymus and Lathyrus ramets decreased along the toposequence, both species persisted onto the stabilized dune where they were the most frequent vascular plants. Such persistence appears to be related to the ability of both species to physiologically adjust to local conditions. Because of the climatic context, subarctic coastal dunes constitute unique systems, with characteristics quite different from those of lower-latitude coastal dune systems.
Author Address Univ Laval, Dept Biol, St Foy, PQ G1K 7P4, Canada; Univ Laval, Ctr Etud Nord, St Foy, PQ G1K 7P4, Canada
Reprint Address Houle, G (reprint author), Univ Laval, Dept Biol, St Foy, PQ G1K 7P4, Canada.
Times Cited 7
Total Times Cited Count (WoS, BCI, and CSCD) 7
Publisher UNIVERSITE LAVAL
Publisher City ST FOY
Publisher Address PAVILLON ALEXANDRE-VACHON, UNIV LAVAL, ST FOY, QUEBEC G1K 7P4, CANADA
ISSN 1195-6860
29-Character Source Abbreviation ECOSCIENCE
ISO Source Abbreviation Ecoscience
Year Published 2000
Volume 7
Issue 3
Beginning Page 370
Ending Page 378
Digital Object Identifier (DOI) 10.1080/11956860.2000.11682607
Page Count 9
Web of Science Category Ecology
Subject Category Environmental Sciences & Ecology
Document Delivery Number 347CD
Unique Article Identifier WOS:000088908900014
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