Predicting risks of invasion of macroalgae in the genus Caulerpa in Florida |
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Authors: | Christian G Glardon Linda J Walters Pedro F Quintana-Ascencio Lisa A McCauley Wytze T Stam Jeanine L Olsen |
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Institution: | (1) Department of Biology, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816, USA;(2) Department of Marine Benthic Ecology and Evolution, Biological Centre, University of Groningen, Kerklaan 30, P.O. Box 14, 9750 AA Haren, The Netherlands |
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Abstract: | There is worldwide concern about the aquarium strain of the green alga Caulerpa taxifolia (Vahl) C. Agardh that was introduced to the Mediterranean Sea in 1984. Since that time, it has flourished and now covers
thousands of hectares of near-shore waters. More recently, aquarium strains of C. taxifolia invaded southern California and Australian waters. Our goal was to evaluate potential invasion of C.
taxifolia to Florida’s coastal waters. We looked for evidence of C. taxifolia—aquarium strain, as well as the present distribution of all species of Caulerpa, in Florida’s near-shore waters. We surveyed 24 areas in six zones along the Floridian coastline, and evaluated the association
of potential indicators for the presence of Caulerpa. Latitude, presence of seagrass beds, human population density, and proximity to marinas were the four variables simultaneously
considered. Caulerpa taxifolia—aquarium strain was not found at any of our survey locations. However, 14 species of Caulerpa were found at 31 of the 132 sites visited. Percent correct for our model was 61.5% for presence and 98.1% for absence. There
was a positive correlation between Caulerpa spp. and seagrass beds and proximity to marinas. There was a negative correlation with latitude and human population density.
The parameters in the logistic regression model assessing the association of Caulerpa occurrence with the measured variables were then used to predict current and future probabilities of Caulerpa spp. presence throughout the state. This prediction model will allow resource managers to focus their efforts in future surveys. |
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Keywords: | Algae Caulerpa taxifolia Chlorophyta Coastal Invasive species Prediction models |
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