<i>In situ</i> hyperspectral characteristics and the discriminative ability of remote sensing to coral species in the South China Sea

Zeng, Kai; Xu, Ziqian; Yang, Ye; Liu, Yongming; Zhao, Hongwuyi; Xie, Baicheng; Zhou, Wen; Cai, Li; Cao, Wenxi

doi:10.1080/15481603.2022.2026641

Cited by 13 publications

(4 citation statements)

References 63 publications

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“…Huang et al (2015) suggested that the SCS hosts a richness of reef corals comparable to the Coral Triangle area. Four families of Scleractinia detected in this study were also reported previously (Rodriguez-Lanetty and Hoegh-Guldberg, 2002;Chen et al, 2019;Xu et al, 2019;Li et al, 2022;Zeng et al, 2022). Furthermore, rare species from Brachiopoda, Bryozoa, Nemertea, and Platyhelminthes were easily neglected through traditional methods, but were more easily detected by metabarcoding, suggesting high efficiency of this novel method.…”

supporting

confidence: 84%

Metabarcoding survey of meroplankton communities in the South China Sea and Philippine Sea: Shedding light on inter-basin biogeography in the West Pacific

et al. 2022

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Planktonic larvae (meroplankton) plays an important role in both benthic and pelagic ecosystems. The meroplankton study of South China Sea (SCS) and Philippine Sea (PS) may be particularly important, where they could serve as vectors for the influx of Pacific species into the East Indies Triangle (global marine biodiversity center). Here, we employed a metabarcoding method to investigate the geographical distribution pattern of meroplankton among SCS and PS. Different primers and reference databases were tested, for a better and more reliable interpretation of the current results and improvement of the method. In this study, metabarcoding was efficient for meroplankton study with high taxonomic resolution and good accuracy. COI against NCBI NT database showed the best taxonomy annotation efficiency, followed by 18S V1-V2, then 18S V4. The SILVA database showed similar performance to the NCBI NT database for the two 18S primers. The meroplankton diversity of SCS is higher than that of PS, and both communities are dominated by Polychaeta, Mollusca, Arthropoda and Echinodermata. Meroplankton geographical patterns are significantly different between the two basins, possibly due to the different distribution of their benthic adult, as well as the influence of five key environmental factors (IC, SCM, SST, SSS and DO). Our results suggest that the unidirectional Kuroshio Current intrusion may play an important role in shaping the biogeographical pattern in the west Pacific, by facilitating planktonic-larvae flowing into the northern SCS from the Pacific, on the contrary, limiting planktonic-larvae spreading out.

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supporting

confidence: 84%

Metabarcoding survey of meroplankton communities in the South China Sea and Philippine Sea: Shedding light on inter-basin biogeography in the West Pacific

et al. 2022

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“…While we did not test the retrievability of coral symbiont chlorophyll concentrations at coarser spatial resolutions, we believe that controlling for inter-colony variability in sand and macroalgal cover does provide some leverage to focus spectroscopy on portions of the reef that are dominated by living corals. This may be translatable to satellite-based observations at coarser resolutions, such as 10-30 m, if similar methods that account for scale-dependent filtering can be applied, such as has been achieved by Zeng et al [53]. Future research will test this possibility.…”

Section: Discussionmentioning

confidence: 97%

Variability in Symbiont Chlorophyll of Hawaiian Corals from Field and Airborne Spectroscopy

Asner,

Drury,

Vaughn

et al. 2024

Remote Sensing

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Corals are habitat-forming organisms on tropical and sub-tropical reefs, often displaying diverse phenotypic behaviors that challenge field-based monitoring and assessment efforts. Symbiont chlorophyll (Chl) is a long-recognized indicator of intra- and inter-specific variation in coral’s response to environmental variability and stress, but the quantitative Chl assessment of corals at the reef scale continues to prove challenging. We integrated field, airborne, and laboratory techniques to test and apply the use of reflectance spectroscopy for in situ and reef-scale estimation of Chl a and Chl c2 concentrations in a shallow reef environment of Kāne‘ohe Bay, O‘ahu. High-fidelity spectral signatures (420–660 nm) derived from field and airborne spectroscopy quantified Chl a and Chl c2 concentrations with demonstrable precision and accuracy. Airborne imaging spectroscopy revealed a 10-fold range of Chl concentrations across the reef ecosystem. We discovered a differential pattern of Chl a and Chl c2 use in symbiont algae in coexisting corals indicative of a physiological response to decreasing light levels with increasing water depth. The depth-dependent ratio of Chl c2:a indicated the presence of two distinct light-driven habitats spanning just 5 m of water depth range. Our findings provide a pathway for further study of coral pigment responses to environmental conditions using field and high-resolution airborne imaging spectroscopy.

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“…It is important to note that the spectral data gathered can be used to accurately and automatically classify broad benthic types (coral, algae, sand), as previously outlined by [31,34]. Due to the extensive coverage provided by hyperspectral data, further refinement of the classifications will develop rapidly with return surveys [35]. However, while identification of coral species by spectral data alone is currently not possible, in future, a combination of enhanced spectral libraries and the use of other complementary metrics, such as photomosaics and 3D information machine learning algorithms, may achieve this goal.…”

Section: Discussionmentioning

confidence: 99%

A Demonstration of the Capability of Low-Cost Hyperspectral Imaging for the Characterisation of Coral Reefs

Teague,

Day,

Allen

et al. 2023

Oceans

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The use of hyperspectral imaging in marine applications is limited, largely due to the cost-prohibitive nature of the technology and the risk of submerging such expensive electronics. Here, we examine the use of low-cost (<5000 GBP) hyperspectral imaging as a potential addition to the marine monitoring toolbox. Using coral reefs in Bermuda as a case study and a trial for the technology, data was collected across two reef morphologies, representing fringing reefs and patch reefs. Hyperspectral data of various coral species, Montastraea cavernosa, Diploria labyrinthiformis, Pseudodiploria strigosa, and Plexaurella sp., were successfully captured and analyzed, indicating the practicality and suitability of underwater hyperspectral imaging for use in coral reef assessment. The spectral data was also used to demonstrate simple spectral classification to provide values of the percentage coverage of benthic habitat types. Finally, the raw image data was used to generate digital elevation models to measure the physical structure of corals, providing another data type able to be used in reef assessments. Future improvements were also suggested regarding how to improve the spectral data captured by the technique to account for the accurate application of correction algorithms.

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In situ hyperspectral characteristics and the discriminative ability of remote sensing to coral species in the South China Sea

Cited by 13 publications

References 63 publications

Metabarcoding survey of meroplankton communities in the South China Sea and Philippine Sea: Shedding light on inter-basin biogeography in the West Pacific

Metabarcoding survey of meroplankton communities in the South China Sea and Philippine Sea: Shedding light on inter-basin biogeography in the West Pacific

Variability in Symbiont Chlorophyll of Hawaiian Corals from Field and Airborne Spectroscopy

A Demonstration of the Capability of Low-Cost Hyperspectral Imaging for the Characterisation of Coral Reefs

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