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Effects of Epiphytes and Depth on Seagrass Spectral Profiles: Case Study of Gulf St. Vincent, South Australia

Author

Listed:
  • Charnsmorn Hwang

    (Department of Environmental Engineering, National Cheng Kung Chung University, Tainan City 701, Taiwan)

  • Chih-Hua Chang

    (Department of Environmental Engineering, National Cheng Kung Chung University, Tainan City 701, Taiwan
    Global Water Quality Research Center, National Cheng Kung University, Tainan City 701, Taiwan)

  • Michael Burch

    (Department of Ecology & Evolutionary Biology, The University of Adelaide, Adelaide, South Australia 5005, Australia)

  • Milena Fernandes

    (Australian Water Quality Centre, SA Water, Adelaide, South Australia 5000, Australia
    College of Science and Engineering, Flinders University, Adelaide, South Australia 5001, Australia)

  • Tim Kildea

    (Australian Water Quality Centre, SA Water, Adelaide, South Australia 5000, Australia)

Abstract

Seagrasses are a crucial indicator species of coastal marine ecosystems that provide substratum, shelter, and food for epiphytic algae, invertebrates, and fishes. More accurate mapping of seagrasses is essential for their survival as a long-lasting natural resource. Before reflectance spectra could properly be used as remote sensing endmembers, factors that may obscure the detection of reflectance signals must be assessed. The objectives in this study are to determine the influence of (1) epiphytes, (2) water depth, and (3) seagrass genus on the detection of reflectance spectral signals. The results show that epiphytes significantly dampen bottom-type reflectance throughout most of the visible light spectrum, excluding 670–679 nm; the depth does influence reflectance, with the detection of deeper seagrasses being easier, and as the depth increases, only Heterozostera increase in the exact “red edge” wavelength at which there is a rapid change in the near-infrared (NIR) spectrum. These findings helped improve the detection of seagrass endmembers during remote sensing, thereby helping protect the natural resource of seagrasses.

Suggested Citation

  • Charnsmorn Hwang & Chih-Hua Chang & Michael Burch & Milena Fernandes & Tim Kildea, 2019. "Effects of Epiphytes and Depth on Seagrass Spectral Profiles: Case Study of Gulf St. Vincent, South Australia," IJERPH, MDPI, vol. 16(15), pages 1-16, July.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:15:p:2701-:d:252602
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    References listed on IDEAS

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    1. Charnsmorn Hwang & Chih-Hua Chang & Michael Burch & Milena Fernandes & Tim Kildea, 2019. "Spectral Deconvolution for Dimension Reduction and Differentiation of Seagrasses: Case Study of Gulf St. Vincent, South Australia," Sustainability, MDPI, vol. 11(13), pages 1-14, July.
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