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Increasing canopy shading reduces growth but not establishment of Elodea nuttallii and Myriophyllum spicatum in stream channels |
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| Authors: | Emily Zefferman |
| Institution: | 1. Fisheries and Aquatic Sciences Program, School of Forest Resources and Conservation, University of Florida, 7922 NW 71st Street, Gainesville, FL, 32605, USA 2. Department of Biological Sciences, University of Alabama, 407 Biology Building, Box 870344, Tuscaloosa, AL, 35487, USA 3. Department of Wildlife and Ecology, University of Florida, 110 Newins Ziegler Hall, P.O. Box 110430, Gainesville, FL, 32611, USA 4. Southeast Fisheries Science Center, National Marine Fisheries Service, 75 Virginia Beach Drive, Miami, FL, 33149, USA 5. School of Natural Resources and Environment, University of Florida, 103 Black Hall, P.O. Box 116455, Gainesville, FL, 32611, USA |
| Abstract: | In aquatic environments around the globe, rooted macrophytes have been replaced by filamentous macroalgae. The consequences of such shifts in vegetative habitat for fauna are poorly understood. Given differences in morphology and life history characteristics of rooted macrophytes and filamentous macroalgae, we hypothesized that these habitat types were not functionally redundant for small-bodied fishes and macroinvertebrates. We examined this hypothesis in spring-fed Florida rivers characterized by decreases in native rooted macrophytes and concomitant increases in filamentous macroalgae. Although faunal densities were generally greater in filamentous macroalgae than in rooted macrophytes, differences in the community assemblage structure suggest that the two types of vegetative habitat do not function interchangeably. Accordingly, continued replacement of rooted macrophytes with filamentous macroalgae is expected to affect the small fish and macroinvertebrate community, as well as higher trophic levels that depend on it. |
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