Ryukyu Islands, Japan

Sinniger, Frédéric; Harii, Saki; Humblet, Marc; Nakamura, Yohei; Ohba, Hideo; Prasetia, Rian

doi:10.1007/978-3-319-92735-0_13

Cited by 10 publications

(6 citation statements)

References 48 publications

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“…36.1). Mean annual light intensity at 40 m depth was 7.7% of the light intensity at the surface in cloudy conditions and 9.7% in sunny conditions (Prasetia et al 2017, see also Sinniger et al 2019).…”

Section: Study Sitesmentioning

confidence: 89%

Coral Sclerochronology: Similarities and Differences in the Coral Isotopic Signatures Between Mesophotic and Shallow-Water Reefs

Watanabe

Yamazaki

et al. 2019

Coral Reefs of the World

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Coral sclerochronology is a powerful tool for understanding environmental and ecological changes on coral reefs. Geochemical, isotopic, and skeletal density banding analyses along the major growth axis of massive coral skeletons from tropical shallow-water reefs have been used successfully to reconstruct decadal-to centennial-scale histories of climate and coral growth with annual to seasonal resolution. However, little is known about how coral sclerochronological approaches could capture environmental and/or physiological changes in mesophotic coral ecosystems (MCEs), which occur at depths ranging from 30 to 150 m. We compared the oxygen and carbon isotopes and growth records of coral from upper MCEs with those from adjacent shallow reefs by examining Porites corals collected at 4 and 40 m from Okinawa, Japan, and from 5 and 50 m water depths from the Gulf of Eilat, Red Sea, Israel. Porites corals in MCEs exhibited low calcification rates, but still recorded distinct seasonal to interannual variability in oxygen and carbon isotope signals consistent with coral isotopic records on shallow reefs. The amplitudes of the seasonality in the isotopic records in corals from MCEs were larger than those expected from seasonal environmental variations and those recorded in shallow reefs, indicating that coral growth rate and/or physiological changes affected skeletal isotopic composition. Our results suggest that sclerochronological records have great potential for reconstructing environmental and ecological characteristics of MCEs. The isotopic records of MCE corals are also more influenced by physiological processes such as symbiotic photosynthesis, calcification rates, and trophic levels than their shallow-water counterparts.

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Section: Study Sitesmentioning

confidence: 89%

Coral Sclerochronology: Similarities and Differences in the Coral Isotopic Signatures Between Mesophotic and Shallow-Water Reefs

Watanabe

Yamazaki

et al. 2019

Coral Reefs of the World

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“…Coral communities were investigated through photo-quadrats. The photo-quadrat system used in this research was described in Sinniger et al (2019) and was equipped either with GoPro cameras (from Hero3 Black to Hero7 Black) or Canon G15 cameras set with a time lapse mode using the Canon Hack Development Kit (Montabone 2010). Photo-quadrats (0.5×0.5 m) were either deployed by divers or remotely from the boat when depths were not accessible to SCUBA diving.…”

Section: Methodsmentioning

confidence: 99%

“…Galaxea, Journal of Coral Reef Studies (Armstrong et al 2019;Pyle 2019). In this context, the use of simpler systems such as time-lapse photo-quadrat systems or drop camera can already provide precious quantitative information (Sinniger et al 2019). (Sinniger et al 2013;Prasetia et al 2016;Prasetia et al 2017).…”

Section: All These Techniques Require Significant Funding and Skillsmentioning

confidence: 99%

Overview of the mesophotic coral ecosystems around Sesoko Island, Okinawa, Japan

Sinniger

Albelda

Prasetia

et al. 2022

Galaxea, Journal of Coral Reef Studies

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“…Recent studies showed that Japanese MCEs exhibit some of the highest scleractinian diversity in the world, making them challenging to monitor [17–19]. Seriatopora hystrix is one of the most common species [27]; however, the present study failed to detect S. hystrix in Zamami mesophotic ecosystems because the mitochondrial genome of Seriatopora has not yet been sequenced, preventing its inclusion in scleractinian-specific eDNA metabarcoding analyses.…”

Section: Discussionmentioning

confidence: 75%

“…Therefore, we employed a mini-ROV to sample eDNA from mesophotic corals at depths of 30-80 m. MCEs in the Okinawa Archipelago of Japan exhibit some of the greatest scleractinian diversity in the world. At least 47 genera belonging to 14 families have been identified [17][18][19]. Kerama National Park of Japan, approximately 30 km west of Okinawa Island, boasts some of the most transparent water in the Okinawa Archipelago, and is known as 'Kerama blue' (figure 1).…”

Section: Introductionmentioning

confidence: 99%

Possible monitoring of mesophotic scleractinian corals using an underwater mini-ROV to sample coral eDNA

Nishitsuji,

Nagahama,

Narisoko

et al. 2024

R. Soc. Open Sci.

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Mesophotic coral ecosystems (MCEs) are light-dependent tropical or subtropical communities occurring at depths of 30–150 m. Broader surveys of MCEs are needed to better understand stony corals, the keystone species of coral-reef ecosystems. While MCEs have been studied by professional SCUBA divers and with deep-sea robots, comprehensive surveys of MCEs are required. An eDNA metabarcoding method has recently been used to survey scleractinian corals in shallow reefs. We tested whether MCEs might be more comprehensively surveyed by collecting seawater samples using an underwater mini-remote operated vehicle (mini-ROV). Seawater was collected 1–2 m above reef tops at depths of 20–80 m at 24 sites in six locations around the Zamami Islands (Okinawa, Japan). Water samples were then subjected to coral-specific eDNA amplification. Metabarcoding analyses of amplicons showed that except for one site, coral-specific eDNA from approximately 0.5 l seawater samples was sufficient to identify genera. The proportion of Acropora eDNA was higher at shallow reefs and upper ridges of slopes, while the proportion of Porites increased at mesophotic sites . Although further technical improvements are required, this study suggests that it may be possible to monitor mesophotic corals to the generic level using eDNA collected using mini-ROVs.

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Ryukyu Islands, Japan

Cited by 10 publications

References 48 publications

Coral Sclerochronology: Similarities and Differences in the Coral Isotopic Signatures Between Mesophotic and Shallow-Water Reefs

Coral Sclerochronology: Similarities and Differences in the Coral Isotopic Signatures Between Mesophotic and Shallow-Water Reefs

Overview of the mesophotic coral ecosystems around Sesoko Island, Okinawa, Japan

Possible monitoring of mesophotic scleractinian corals using an underwater mini-ROV to sample coral eDNA

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