Aquatic Sciences Meeting, Albuquerque 2001
| CS30 Remote Sensing and Technological Tools |
| Date: Tuesday, February 13, 2001, Time: 11:15:00 AM |
| Location: Sandia/Santa Ana |
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| Yentsch, C, S, Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor, ME 04575, USA, csyentsch@aol.com |
| Yentsch, C, M, Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor ME 04575, USA, cmyentsch@aol.com |
| Woodman, S, F, Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor, ME 04575, USA, sfwoodman@hotmail.com |
| Phinney, D, A, Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor, ME 04575, USA, dphinney@bigelow.org |
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| RELATIONSHIP BETWEEN REFLECTANCE (VISIBLE AND NEAR-IR) AND VARIABLE FLUORESCENCE IN SEAWEEDS, SEAGRASSES AND CORALS |
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| The relationship between bi-directional reflectance of wavelengths of visible light to those in the infrared have been routinely used by remote sensing terrestrial botanists for measurement of leaf area index as well as indices of plant growth and health.
The marine biologist concerned with measurement of primary production of the marine benthos are limited in making estimates of this sort by the influence of water absorption bands. The exception occurs in communities in clear, shallow waters or where the absorbing material is dispersed over the entire water column at concentrations that overwhelm the strong near infrared absorption by water.
In an attempt to further understand the water problem, we have measured the visible and near-IR reflectance in different species of seaweeds, seagrasses, and corals. We find that a strong correlation exists between the chlorophyll reflectance at 685 and 800 nm in all species tested to date. We have also measured variable pulsed fluorescence on the same species. This is a measurement of the condition of photosystem II. We find considerable variability which appears mostly due to species. However, we have observed that decreases in variable fluorescence might serve as an index of organism vitality.
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