Extended
drawdown effects on a lakeshore
propagule bank
propagule bank
In general, our results indicate:
1) hydrologic regime is a strong influence on species composition and richness, and
2) water fertility can augment hydrology effects by influencing individual plant growth. Results of this research provide information on wetland plant responses to small, short-term, and pronounced, long-term changes in lake water levels. Plant propagules that remain viable in dry sediments, combined with those that are carried by rising waters, contribute to rapid re-establishment of wetland vegetation in the lake and confer resilience to prolonged drawdown. Propagule response to small amplitude, seasonal fluctuations in water level contribute to vegetation composition and richness, including the balance of aquatic vs. more upland species, from site to site along the shoreline and from season to season. Plant growth response to water fertility may also influence wetland vegetation cover.
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