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Article
Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys
Remote Sensing
  • Gerardo Toro-Farmer, University of South Florida
  • Frank E. Muller-Karger, University of South Florida
  • Maria Vega-Rodriguez, University of South Florida
  • Nelson Melo, Florida International University
  • Kimberly Yates, U.S. Geological Survey
  • Sergio Cerdeira-Estrada, National Commission for Knowledge and Use of Biodiversity (CONABIO)
  • Stanley R. Herwitz, NASA Research Park
Document Type
Article
Publication Date
1-23-2016
Keywords
  • Florida Keys,
  • corals,
  • seagrass,
  • light spectrum,
  • benthos productivity
Digital Object Identifier (DOI)
https://doi.org/10.3390/rs8020086
Disciplines
Abstract

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.

Rights Information
Creative Commons Attribution 4.0
Citation / Publisher Attribution

Remote Sensing, v. 8, issue 2, art. 86

Citation Information
Gerardo Toro-Farmer, Frank E. Muller-Karger, Maria Vega-Rodriguez, Nelson Melo, et al.. "Characterization of Available Light for Seagrass and Patch Reef Productivity in Sugarloaf Key, Lower Florida Keys" Remote Sensing Vol. 8 Iss. 2 (2016)
Available at: http://works.bepress.com/frank_muller-karger/28/