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The distribution of Vallisneria americana seeds and seedling light requirements in the upper Mississippi River

Canadian Journal of Botany

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Abstract

Vallisneria americana declined in backwaters of the Upper Mississippi River, U.S.A., after a drought in 1988. To determine whether viable seeds of V. americana occurred in the seed bank of navigation pool 7, Lake Onalaska, the upper 5 cm of sediment was collected from 103 sites in May 1990. These sediment samples were kept in pots at a depth of 0.4, 0.8, and 1.2 m in an outdoor pond for 12 weeks. Vallisneria americana seeds germinated from sites throughout the lake, and some seedlings produced overwintering buds by the end of the study. Seeds, spores, or fragments of 12 other species of aquatic plants also germinated. Seed germination trials with fresh and stored seeds in both greenhouse and ponds in which light availability was reduced with shade cloths indicated that seed germination was insensitive to light level. To determine the tight requirements for seedling survival and bud production, sediment from Lake Onalaska was incubated in ponds under neutral density shade screens reducing light to 2, 5, 9, and 25% of full sun. Seeds germinated under all shade treatments but survival was significantly higher in the 9 and 25% light treatments, and bud production was restricted to these light levels.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The distribution of Vallisneria americana seeds and seedling light requirements in the upper Mississippi River
Series title:
Canadian Journal of Botany
Volume
73
Issue:
12
Year Published:
1995
Language:
English
Publisher:
Iowa State University, Botany Dept
Publisher location:
Ames, IA
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
pp. 1966-1973
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Botany
First page:
1966
Last page:
1973
Number of Pages:
8