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Remote Sens. 2016, 8(2), 86;

Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys

Institute for Marine Remote Sensing, College of Marine Science, University of South Florida, 140 7th Ave. S., St. Petersburg, FL 33701, USA
Florida International University, 11200 SW 8th St, Miami, FL 33174, USA
U.S. Geological Survey, 600 Fourth Street South, St. Petersburg, FL 33701, USA
National Commission for Knowledge and Use of Biodiversity (CONABIO), Liga Periferico—Insurgentes Sur 4903, Parques del Pedregal, Tlalpan, Mexico, D.F. 14010, Mexico
UAV Collaborative, NASA Research Park, Mail Stop 18-2, Moffett Field, CA 94035, USA
Author to whom correspondence should be addressed.
Academic Editors: Stuart Phinn, Chris Roelfsema, Xiaofeng Li and Prasad S. Thenkabail
Received: 16 September 2015 / Revised: 4 January 2016 / Accepted: 18 January 2016 / Published: 23 January 2016
(This article belongs to the Special Issue Remote Sensing for Coral Reef Monitoring)
Full-Text   |   PDF [2468 KB, uploaded 23 January 2016]   |  


Light availability is an important factor driving primary productivity in benthic ecosystems, but in situ and remote sensing measurements of light quality are limited for coral reefs and seagrass beds. We evaluated the productivity responses of a patch reef and a seagrass site in the Lower Florida Keys to ambient light availability and spectral quality. In situ optical properties were characterized utilizing moored and water column bio-optical and hydrographic measurements. Net ecosystem productivity (NEP) was also estimated for these study sites using benthic productivity chambers. Our results show higher spectral light attenuation and absorption, and lower irradiance during low tide in the patch reef, tracking the influx of materials from shallower coastal areas. In contrast, the intrusion of clearer surface Atlantic Ocean water caused lower values of spectral attenuation and absorption, and higher irradiance in the patch reef during high tide. Storms during the studied period, with winds >10 m·s−1, caused higher spectral attenuation values. A spatial gradient of NEP was observed, from high productivity in the shallow seagrass area, to lower productivity in deeper patch reefs. The highest daytime NEP was observed in the seagrass, with values of almost 0.4 g·O2·m−2·h−1. Productivity at the patch reef area was lower in May than during October 2012 (mean = 0.137 and 0.177 g·O2·m−2·h−1, respectively). Higher photosynthetic active radiation (PAR) levels measured above water and lower light attenuation in the red region of the visible spectrum (~666 to ~699 nm) had a positive correlation with NEP. Our results indicate that changes in light availability and quality by suspended or resuspended particles limit benthic productivity in the Florida Keys. View Full-Text
Keywords: Florida Keys; corals; seagrass; light spectrum; benthos productivity Florida Keys; corals; seagrass; light spectrum; benthos productivity

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Toro-Farmer, G.; Muller-Karger, F.E.; Vega-Rodríguez, M.; Melo, N.; Yates, K.; Cerdeira-Estrada, S.; Herwitz, S.R. Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys. Remote Sens. 2016, 8, 86.

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