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Northern Florida reef tract benthic metabolism scaled by remote sensing

Marine Ecology Progress Series

By:
, , , , ,
DOI: 10.3354/meps312123

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Abstract

Holistic rates of excess organic carbon production (E) and calcification for a 0.5 km2 segment of the backreef platform of the northern Florida reef tract (NFRT) were estimated by combining biotope mapping using remote sensing with community metabolic rates determined with a benthic incubation system. The use of ASTER multispectral satellite imaging for the spatial scaling of benthic metabolic processes resulted in errors in E and net calcification (G) of 48 and 431% respectively, relative to estimates obtained using AISA hyperspectral airborne scanning. At 19 and 125%, the E and G errors relative to the AISA-based estimates were less pronounced for an analysis that used IKONOS multispectral satellite imagery to spatially extrapolate the chamber process measurements. Our scaling analysis indicates that the holistic calcification rate of the backreef platform of the northern Florida reef tract is negligible at 0.07 g CaCO3 m-2 d-1. All of the mapped biotopes in this reef zone are net heterotrophic, resulting in an estimated holistic excess production rate of -0.56 g C m-2 d-1, and an overall gross primary production to respiration ratio of 0.85. Based on our finding of ubiquitous heterotrophy, we infer that the backreef platform of the NFRT is a sink for external inputs of suspended particulate organic matter. Further, our results suggest that the inward advection of inorganic nutrients is not a dominant forcing mechanism for benthic biogeochemical function in the NFRT. We suggest that the degradation of the northern Florida reef tract may parallel the community phase shifts documented within other reef systems polluted by organic detritus.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Northern Florida reef tract benthic metabolism scaled by remote sensing
Series title:
Marine Ecology Progress Series
DOI:
10.3354/meps312123
Volume
312
Year Published:
2006
Language:
English
Publisher:
Inter-Research
Contributing office(s):
Coastal and Marine Geology Program
Description:
17 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Marine Ecology Progress Series
First page:
123
Last page:
139
Number of Pages:
17
Country:
United States
State:
Florida
Other Geospatial:
Biscayne National Park