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Using 3D photogrammetry to quantify the subtle differences of coral reefs under the impacts of marine activities.

Authors
  • Chen, Guanyan Keelung1
  • Dai, Chang Feng2
  • 1 Institute of Oceanography, National Taiwan University, Taipei 10617, Taiwan. Electronic address: [email protected] , (Taiwan)
  • 2 Institute of Oceanography, National Taiwan University, Taipei 10617, Taiwan. , (Taiwan)
Type
Published Article
Journal
Marine pollution bulletin
Publication Date
Oct 21, 2021
Volume
173
Issue
Pt B
Pages
113032–113032
Identifiers
DOI: 10.1016/j.marpolbul.2021.113032
PMID: 34689075
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Marine activities may cause the degradation of coral reefs. The composition of benthic communities and seawater quality have been commonly used as the proxies to assess the impacts of marine activities. However, these proxies may not be able to detect the subtle differences within homogeneous environment. We used photogrammetry to quantify the subtle differences of structural complexity between heavily and lightly trafficked sites at Wanlitong, southern Taiwan. Our study demonstrated that the impacts of marine activities can be detected within tens of meters through quantifying structural complexity of coral reefs. Vector ruggedness measure (VRM) is a more suitable metric than conventional linear rugosity to detect such impacts. The correlations between structural complexity and coral cover have variances while comparing with previous studies. The results show that using photogrammetry to quantify the structure of coral reefs can provide a novel aspect to evaluate the subtle differences caused by marine activities. Copyright © 2021 Elsevier Ltd. All rights reserved.

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