. The Canadian field-naturalist. 1980 RiNGius: Coastal Marsh Vegetation, James Bay 117. Figure 6. Earth mound associated with old driftlog and vegetated with Triglochin maritima, Potentilla anserina. Aster, and Carexpaleacea. Puccinelliaphryganodes and Puccinellia lucida are in foreground, and Hordeumjubatum is to the left and right of mound. on the north transect was completely submerged. Carex mackenziei was most prominent but open water pools were numerous and often bordered with stands of Eleocharis, Scirpus, and Hippuris vulgaris (Mare's-tail). Thickets were well developed on the fourth r
. The Canadian field-naturalist. 1980 RiNGius: Coastal Marsh Vegetation, James Bay 117. Figure 6. Earth mound associated with old driftlog and vegetated with Triglochin maritima, Potentilla anserina. Aster, and Carexpaleacea. Puccinelliaphryganodes and Puccinellia lucida are in foreground, and Hordeumjubatum is to the left and right of mound. on the north transect was completely submerged. Carex mackenziei was most prominent but open water pools were numerous and often bordered with stands of Eleocharis, Scirpus, and Hippuris vulgaris (Mare's-tail). Thickets were well developed on the fourth ridge of each transect. Common shrubs included various wil- lows {Salix laurentiana, S. Candida, S. phylicifolia var. planifolia, and 5. bebbiana). Much rarer were Alnus rugosa (Speckled Alder), Betula pumila (Swamp-Birch), and Mvr/cago/e (Sweet Gale). Dense swards of Juncus balticus (Rush) dominated the thicket understory while open areas supported mea- dows of Calamagrostis. Discussion Habitat The main underlying factors affecting the James Bay coastal marshes are low surface slope and post- glacial land emergence which characterize the entire western James Bay-Hudson Bay coastline. The mean slope of m-km~' at Kapiskau compares with m-km"' reported at Fort Albany 60 km S of Kapiskau (Hunter 1970). Hunter also established the rate of land emergence to lie within the range of m per century in support of a previous esti- mate of m per century by Webber et al. (1970) at Cape Henrietta Maria. Using these values, the time required at Kapiskau for the vegetation to pass from the emergent stage on the intertidal flats to the thicket stage, a distance of about km, ranges from 106 to 142 yr. This is much lower than 300 yr reported by Kershaw (1976) for the East Pen Island marsh. In arriving at his figure which is also based on Webber's estimate, however, Kershaw considered the top of the mainland ridge to be the top of the marsh but this, he pointed out, w
Size: 2132px × 1172px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafieldnaturalistsclub, bookcentury1900, bookcolle
