Northern range extension of the seagrasses Halophila johnsonii and Halophila decipiens along the east coast of Florida,USA |
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Authors: | Robert W. Virnstein Lauren M. Hall |
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Affiliation: | 1. St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177, United States;2. St. Johns River Water Management District, 525 Community College Parkway, Melbourne, FL 32909, United States |
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Abstract: | The northern geographic limit for Halophila johnsonii and Halophila decipiens has been reported as Sebastian Inlet, within the Indian River Lagoon, Florida. Surveys conducted in August 2007 determined the new northern limit to be 21.5 km north of the previously known limit. This new northern limit is a 10% range extension for H. johnsonii, a federally threatened species. We conclude that these range extensions are recent, based on (1) the small size of patches; (2) unusually good water clarity conditions due to a recent drought; (3) recent mild/warmer winters; and (4) a recent mechanism for transporting propagules, the numerous hurricanes of 2004. Although this recent range extension is considered ephemeral, similar range extensions may have occurred in the past and may occur again in the future under favorable conditions given the high capacity of these two species for dispersal to favorable sites. The northern limits of these species should not be viewed as static locations; rather, they must be considered dynamic features. |
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Keywords: | Halophila johnsonii Halophila decipiens Seagrass Range extension Seagrass recruitment Indian River Lagoon |
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