Testing the predictive power of seagrass depth limit models |
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| Authors: | Carlos M Duarte Núria Marbà Dorte Krause-Jensen María Sánchez-Camacho |
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| Institution: | (1) Institute of Marine Science, University of North Carolina at Chapel Hill, 3431 Arendell St., Morehead City, NC 28557, USA;(2) Smithsonian Environmental Research Center, P.O. Box 28, Edgewater, MD 21037, USA;(3) Center for Coastal Fisheries and Habitat Research, NOS, NOAA, 101 Pivers Island Road, Beaufort, NC 28516, USA |
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| Abstract: | The power of equations predicting seagrass depth limit (Zc) from light extinction (K
z) was tested on data on seagrass depth limits collected from the literature. The test data set comprised 424 reports of seagrass
colonization depth and water transparency, including data for 10 seagrass species. This data set confirmed the strong negative
relationship betweenZ
c andK
z. The regression equation in Duarte (1991) overestimated the realized seagrass colonization depths at colonization depths
< 5 m, while there was no prediction bias above this threshold. These results indicated that seagrass colonizing turbid waters
(K
z 0.27 m-1) have higher apparent light requirements than those growing in clearer waters. The relationship between seagrass colonization
depth and light attenuation shifts at a threshold of light attenuation of 0.27 m-1, requiring separate equations to predictZ
c for seagrass growing in more turbid waters and clearer waters, and to set targets for seagrass restoration and conservation
efforts. |
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