財団法人服部植物研究所報告
Online ISSN : 2432-8944
Print ISSN : 0073-0912
THE MOSS FLORA OF THE GULF OF ST. LAWRENCE REGION: ECOLOGY AND PHYTOGEOGRAPHY
RENÉ J. BELLAND
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1987 年 62 巻 p. 205-267

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  The Gulf of St. Lawrence moss flora is diverse and consists of 522 species. Based on similarity of distribution within the Gulf, 11 species groups are recognized: Widespread, Widespread Southern, Southern, Restricted Southern, Widespread Northern (I), Widespread Northern (II), Gulf, Disjunct Gaspé-Northwest Newfoundland, Northwest Newfoundland, Eastern, and Newfoundland Only.

  The Gulf of St. Lawrence distribution patterns can be explained by present-day climatic and edaphic factors. Climatic factors are most important in explaining the distribution patterns. Other important factors include geology and physiography, fire, and snow cover. The importance of these differs for each distributional group.

  Forty-three percent of the moss flora reaches its northern or southern limits in eastern North America within the Gulf of St. Lawrence. Of species with their northern limits in the Gulf, 70% are of temperate affinity, while species with their southern limits are mainly of boreal or arctic affinity.

  The moss flora shows a wide diversity of world distributional patterns. Forty-six percent of the species show more or less continuous distributions in their global range. However, a large proportion have major disjunctions in their world distributions, and many of these have smaller disjunctions in a portion of their eastern North American distribution. Species with these latter disjunctions have been used to support hypotheses of survival in ice-free enclaves within the Gulf during the Last Glaciation.

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© 1987 Hattori Botanical Laboratory
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