Which plant is NOT tolerant to drawdown?

A waterlily is not tolerant to drawdown because it relies on consistent water levels for its growth and flowering. Waterlilies are rooted in the sediment of shallow waters, and their buoyant leaves and showy flowers are adapted to floating on the surface. When water levels drop significantly, their foliage can become exposed and damaged, hindering their ability to photosynthesize and ultimately reducing their chances of survival in a drawdown situation.

In contrast, cattails, sago pondweed, and coontail have adaptations that allow them to withstand fluctuations in water levels. Cattails have rhizomes that can survive in muddy conditions, sago pondweed can regrow from its tubers during periods of reduced water, and coontail has a flexible structure that allows it to thrive in varying water depths. Understanding the tolerance levels of these aquatic plants to changes in water levels is essential for effective management of aquatic ecosystems.