Effects of Light and Nutrient Availability on the Growth and Reproduction of the Aquatic Plant Wild Celery (Vallisneria americana)
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Authors
Williams, Jeanette
Issue Date
1998
Type
Thesis
Language
en_US
Keywords
Alternative Title
Abstract
Freshwater habitats have changed over time as a result of anthropogenic effects in
the form of fertilizers and soil runoff from erosion. The increased nutrient availability
and turbidity of the water has been shown to have an effect on certain freshwater plant
species. Vallisneria americana (wild celery) is a freshwater plant species of particular
ecological significance. It is a common duck and muskrat food and offers protection to
small organisms. The object of this experiment was to grow V. americana under
controlled conditions that varied light and nutrients to see how it may respond to the
anthropogenic effects of increased nutrient availability and turbidity. V. americana was
planted in large plastic containers under four different conditions: ambient Iight/high
nutrients, ambient light/low nutrients, shade/high nutrients, and shade/low nutrients.
Observations of plant growth and reproduction were taken over a period of 52 days.
Leaves of V. americana grown in shade conditions grew tall and narrow and the plants
produced many tubers, although new shoot production along lateral rhizomes was low.
Plants grown in ambient light had leaves that were wider and shorter than that of shade
treatments and produced many new shoots. In contrast, nutrients alone did not seem
particularly important to plant growth or reproduction. We suggest that the effects of
light availability on Vallisneria americana will have consequences for aquatic fowl
populations. Diving ducks should be favored by high water turbidity, since they
primarily eat tubers. However, dabbling duck should thrive on plants grown in ambient
light because the overall amount of available above ground vegetation may be greater.
Description
vi, 22 p.
Citation
Publisher
Kalamazoo College
License
U.S. copyright laws protect this material. Commercial use or distribution of this material is not permitted without prior written permission of the copyright holder.