Vegetation dynamics in impounded marshes along the Indian River Lagoon,Florida, USA |
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Authors: | Jorge R Rey Roy A Crossman Tim R Kain |
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Institution: | (1) Florida Medical Entomology Laboratory, University of Florida-IFAS, 200 9th Street SE, 32962 Vero Beach, Florida, USA |
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Abstract: | Data are presented on the vegetation dynamics of two impounded marshes along the Indian River Lagoon, in east-central Florida,
USA. Vegetation in one of the marshes (IRC 12) was totally eliminated by overflooding and by hypersaline conditions (salinities
over 100 ppt) that developed there in 1979 after the culvert connecting the marsh with the lagoon was closed. Over 20% recovery
of the herbaceous halophytesSalicornia virginica, S. bigelovii, andBatis maritima was observed at that site after the culvert was reopened in 1982, but total cover in the marsh remains well below the original
75%. No recovery of mangroves was observed at this site. The second site (SLC 24), while remaining isolated from the lagoon
during much of the study, did not suffer the complete elimination of vegetation experienced at the first site. At this location,
mangroves increased in cover and frequency with a concomitant decrease in herbaceous halophytes.
Considerable damage to the vegetation was evident at IRC 12 when the impoundment was closed and flooded for mosquito control
in 1986. Although the damage was temporary, its occurrence emphasizes the need of planning and constant monitoring and adjustment
of management details as conditions within particular marshes change. Storms and hurricanes may be important in promoting
a replacement of black mangroves by red mangroves in closed impoundments because the former cannot tolerate pneumatophore
submergence for long periods of time.
University of Florida-IFAS Journal Series R-00521. |
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Keywords: | Batis Impoundment Mangroves Salicornia Salt marsh Vegetation |
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