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Abstract Detail

Physiological Section

Thorhaug, Anitra [1], Berlyn, Graeme [2], poulos, Helen Mills [3].

Comparison of 4 seagrass and 1 red macroalgal spectral signatures in red and blue light: utilized for remote imagery mapping.

Globally, shorelines including Bay and estuary benthic bottoms, marine macroalgae dominate the hard bottoms, while seagrass dominate the soft bottoms. The worldwide seagrass population declines at accelerating rates, (7%/y, Waycott et al 2011) despite conservation efforts worldwide. Remote sensing mapping of benthic macro-vegetation for seagrasses and macroalgae is vital for seagrass stewardship and presently occurs for forests. One critical problem of sensing delineation of seagrass and benthic remote measurements concerns signatures of physiological spectral responses information for seagrass to major natural and anthropogenic changes. We previously delineated spectral signatures for salinity and temperature responses of seagrass species. Herein we examine the critical factor of various colors (Blue vs. red) light and intensity of light in estuarine conditions and signature responses of seagrass and macroalgae to their changes. The changing color and intensity of light in estuaries is complex due to changes created by seawater and DSO, and other water substances, riverine input, turbidity by winds and input, and anthropogenic sources of effluents (point source, and sheet flow).   Our non-destructive spectral methods include incubation with various colored light filters of whole living plants measured spectral reflectance, partial absorption and first derivative and analysis of spectral indices from whole living plants of Zostera marina, Thalassia testudinum, Syringodium filiforme, Halodule wrightii , and Laurencia poitei, n= 72 .Incubation times were 6 h and additionally for seagrasses 24, 48, and 72 hours with Intensities 75%, 40%, 23% and 10%. Pigment activations are compared to Pacific Zostera field incubations of several weeks by others. Our investigational responses of seagrass vs red algae during red vs. blue light shows profound pigment changes, in the accessory pigment and Chlorophyll a and b spectral regions . Response changes to intensity levels range from photo-protection responses at high light levels to activation of accessory pigments for light capture. Spectral data and analysis of spectral reflectance indices ARI, BGBO, various carotenoid indices, RedGreen Edge CRIg and CRI red versus presently standard but less sensitive indices NDVI and CNDVI and an array of other indices such as PRI, SIPI, MND705, SR680, DD, Green and Red edges will be delineated. Implications into marine physiological light adaptation will be examined. Intertidal vs. subtidal plants responses to color and intensity will be compared. Mapping will be discussed using spectral signature qualities.

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1 - Yale University, School of Forestry and environmental studies, 370 Prospect St , New Haven, ct, 06511, usa
2 - Yale University, School Of Foresty & Evironmental Studies, GREELEY LAB-370 PROSPECT ST, NEW HAVEN, CT, 06511, USA, 203/432-5142
3 - Wesleyan UNiversity , Evolution, 45 Wyllys Avenue, MIddleton, Ct, 06459

spectral signatures marine macroalgae
spectral signatures seagrass
colored light
blue light
red light
Thalassia testudinum
Halodule wrightii
Zostera marina
Syringodium filiforme
Laurencia poiteii
spectral reflectance indices.

Presentation Type: Oral Paper:Papers for Sections
Session: 42
Location: Pines South/Boise Centre
Date: Wednesday, July 30th, 2014
Time: 2:00 PM
Number: 42003
Abstract ID:290
Candidate for Awards:None

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