Decline and restoration of Vallisneria americana in the Upper Mississippi River

Kimber, Anne

doi:10.31274/rtd-180817-6948

Cited by 1 publication

(3 citation statements)

References 27 publications

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“…These light requirements are the same as those for plants grown from buds (Kimber 1994) and are in agreement with field studies in the Potomac River that indicate-that minimal seasonal light availability of 10% is necessary for Vallisneria clonal reproduction (Carter and Rybicki 1990). Light levels in Lake Onalaska were monitored during the summer of 1990 (Owens 1993) and indicate that the depth for 10% light availability was less than 0.5 m. In the seed-bank study, three sites were less than 0.5 m and Vallisneria occurred at two of those locations.…”

Section: Discussionmentioning

confidence: 84%

“…In the open cells 25 % of terrestrial light was transmitted to the sediment surface. Under the 63 % shade screen, 9 % of terrestrial light was transmitted, under the 80% shade screen 5 % of terrestrial light was transmitted, and under the 92% shade screen 2 % of terrestrial light was transmitted (Kimber 1994 …”

Section: Effects Of Light On Seedling Growth and Bud Productionmentioning

confidence: 99%

“…Seedling emergence and seedling bud production were monitored as part of a 1992 study on the seasonal light requirements for plants to reproduce from overwintering buds (Kimber 1994). Sediment was collected in mid-April 1992 from Lake Onalaska from an area of a former Vallisneria bed.…”

Section: Effects Of Light On Seedling Growth and Bud Productionmentioning

confidence: 99%

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

Kimber¹,

Korschgen²,

Valk³

1995

Can. J. Bot.

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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 light 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.

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Section: Discussionmentioning

confidence: 84%

Section: Effects Of Light On Seedling Growth and Bud Productionmentioning

confidence: 99%