scholarly journals Fluctuating selection by water level on gynoecium colour polymorphism in an aquatic plant

2010 ◽  
Vol 106 (5) ◽  
pp. 843-848 ◽  
Author(s):  
Xiao-Xin Tang ◽  
Shuang-Quan Huang
Keyword(s):  
Water Level ◽  
Aquatic Plant ◽  
Colour Polymorphism ◽  
Fluctuating Selection

Asymmetric pollen–pistil interactions contribute to maintaining floral colour polymorphism in a clonal aquatic plant (Butomus umbellatus L.)

2013 ◽  
Vol 106 ◽  
pp. 29-34 ◽  
Author(s):  
Chun-Feng Yang ◽  
Jun Li ◽  
Robert Wahiti Gituru ◽  
Qing-Feng Wang ◽  
You-Hao Guo
Keyword(s):  
Aquatic Plant ◽  
Colour Polymorphism ◽  
Floral Colour

Does distance between aquatic plant assemblages matter in defining similarity between them during high water-level periods?

2014 ◽  
Vol 19 (1) ◽  
pp. 37-45 ◽  
Author(s):  
José de Ribamar A. de Paiva ◽  
Lígia Q. Matias ◽  
Fernando R. Martins ◽  
Helena Becker
Keyword(s):  
Water Level ◽  
Aquatic Plant ◽  
High Water ◽  
High Water Level ◽  
Plant Assemblages

scholarly journals Assessment of the Aquatic Plant Community in Jackson Lake, Grand Teton National Park, Wyoming: 1991 Status Report

1991 ◽  
Vol 15 ◽  
pp. 139-143
Author(s):  
Carol Brewer
Keyword(s):  
Water Level ◽  
Plant Community ◽  
Aquatic Plant ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Status Report ◽  
Littoral Habitat ◽  
Macrophyte Community ◽  
The Status ◽  
Annual Changes

Since the construction of the first dam at the Snake River outlet at Jackson Lake in the early 1900's, the littoral habitat has been subjected to numerous perturbations of varying intensities. Changing water levels, a consequence of reservoir drawdown schedules, alter plant community species composition and distribution over time. From the perspective of a plant, water level changes present a challenge to growth and community persistence. A plant which begins the growing season 2 m deep may be under 4 m of water after spring runoff fills the reservoir. Later in the summer, the same plant may be left at a depth of only 1 m as water is removed from the reservoir during summer drawdown. The magnitude and timing of water level fluctuations may be one of the most important factors regulating macrophyte community processes upslope on the vertical gradient in Jackson Lake (Brewer and Parker 1990). Under normal regulation, annual changes of 3-4 m are sufficient to select for a plant community with a typically weedy phenology (e.g., Elodea canadensis). In natural lakes with substantially lower annual changes in water levels, species that produce seeds annually are favored (e.g., Potamogeton species). Moreover, drawdowns greater than several meters substantially reduce the lake bed area suitable for the development of extensive shallow water plant beds. The most recent perturbations to the littoral habitat in Jackson Lake began in 1978, when the water level was lowered first from 2065 m (normal pool) to somewhere between 2060 - 2062 m. Then in 1985, the surface elevation of Jackson Lake was further lowered to 2057 m to facilitate repair and modification of the Jackson Lake dam. The entire lake bed was seriously impacted during the four years that the dam was being restored. While the lake bed in the borrow zone and the area adjacent to the dam were obviously impacted by repair activities, the entire shallow littoral zone was severely perturbed when previously inundated sediments were exposed for four years. In 1989, repair was completed and the reservoir was allowed to fill back to the normal pool elevation of 2065 m. Because of severe impacts to the littoral habitat and significant reduction of the submergent plant community caused by restoration of the dam, the status of the aquatic plant community was monitored during the summers of 1989-1991. This report summarizes the status of the aquatic plant community three years after repair of the dam was completed.

scholarly journals Assessment of the Littoral Macrophyte Community in Jackson Lake, Grand Teton National Park,Wyoming

1990 ◽  
Vol 14 ◽  
pp. 79-82
Author(s):  
Carol Brewer
Keyword(s):  
Water Level ◽  
Plant Community ◽  
National Park ◽  
Aquatic Plant ◽  
Current Status ◽  
Grand Teton National Park ◽  
Bureau Of Reclamation ◽  
Littoral Habitat ◽  
Macrophyte Community ◽  
The Status

Beginning in 1978, the water level of Jackson Lake, Grand Teton National Park, Wyoming, was lowered first from 2064.5 m (normal pool) to somewhere between 2060-2061 m, and then in 1985 to 2057 m. The purpose of these drawdowns was to facilitate repair and modification of the Jackson Lake dam. In 1989, repair was completed and the reservoir was allowed to fill back to the normal pool elevation of 2065 m. Because of impacts to the littoral habitat in Jackson Lake caused by restoration of the dam at the Snake River outlet, the status of the aquatic plant community was assessed in August, 1989 and 1990. Previous investigations conducted in 1983 (prior to reconstruction) and 1985 (immediately following drawdown to 2055 m) served as a baseline for comparisons. this report summarizes findings from the 1989 and 1990 studies on impacts to the littoral macrophyte community caused by the repair-related drawdowns. To evaluate the current status of the plant community in Jackson Lake, the following objectives were addressed during August, 1990: 1. Re-examine sites sampled in 1989; 2. Examine sites planted during the summers of 1989 and 1990 by the Bureau of Reclamation.

scholarly journals The Submersed Aquatic Plant Community in Jackson Lake, Grand Teton National Park, Wyoming

1995 ◽  
Vol 19 ◽  
pp. 14-18
Author(s):  
Carol Brewer
Keyword(s):  
Water Level ◽  
Plant Community ◽  
Aquatic Plant ◽  
Nutrient Status ◽  
Growing Season ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Species List ◽  
Spring Runoff ◽  
Macrophyte Community

Submergent macrophyte distribution in lakes is usually related to depth. At lower depths (downslope on the littoral lake bed), macrophyte distribution and growth have been related to light (Spence 1982), substrate texture, nutrient status (Carpenter and Adams 1977), and lake morphometry (Duarte and Kalff 1986). Factors limiting distribution and growth at shallower depths (upslope on the littoral shore) are not as well understood. Meaningful descriptions of plant distributions in reservoirs are problematic because water levels vary through the course of a year (Brewer and Rerslett 1987). Water level fluctuations are a challenge to plant growth. A plant which begins the growing season at a depth of 3 m may be under 6 m of water after spring runoff fills the reservoir. Later in the summer, the same plant may be left at a depth of only 1 m as water is removed from the reservoir during summer drawdown. In reservoirs, where lake levels fluctuate substantially durin_g the growing season, the physical environment is characterized by increased spatial and temporal heterogeneity. Disturbances associated with changing water levels include ice scour during winter drawdown, abrasion due to increased erosion along the lake shore and wave action. Recent work suggests that the magnitude and timing of water level fluctuations may be the most important factor regulating macrophyte community processes at shallower depths in reservoirs (Gasith and Gafny 1990; Brewer and Parker 1990; Rorslett 1984). The status of the aquatic plant community in Jackson Lake was re-evaluated from June - August, 1995. During this time, we compiled a species list and mapped the distribution of macrophyte species.

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