Zooxanthellate Scleractinian Corals of Jeju Island, Republic of Korea

Sugihara, Kaoru; Yamano, Hiroya; Choi, Kwang-Sik; Hyeong, Kiseong

doi:10.1007/978-4-431-54783-9_6

Cited by 23 publications

(35 citation statements)

References 24 publications

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“…Species composition and the number of species in coral communities change drastically at the margin of the Kuroshio Current in the Tokara Straits (Nishihira and Veron ; Sugihara et al. ). This may also be the case in A. tenuis , which is rarely found north of the Tokara Straits, that is, Tanegashima Island.…”

Section: Discussionmentioning

confidence: 99%

“…The Kuroshio Current also acts as a boundary for coral and fish species, separating the "southern Japan coastal region" and the "Okinawan region" (Fukuda et al 1991). Species composition and the number of species in coral communities change drastically at the margin of the Kuroshio Current in the Tokara Straits (Nishihira and Veron 1995;Sugihara et al 2015). This may also be the case in A. tenuis, which is rarely found north of the Tokara Straits, that is, Tanegashima Island.…”

Section: Genetic Diversitymentioning

confidence: 99%

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Unexpectedly complex gradation of coral population structure in the Nansei Islands, Japan

Zayasu

Nakajima

Sakai

et al. 2016

Ecology and Evolution

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To establish effective locations and sizes of potential protected areas for reef ecosystems, detailed information about source and sink relationships between populations is critical, especially in archipelagic regions. Therefore, we assessed population structure and genetic diversity of Acropora tenuis, one of the dominant stony coral species in the Pacific, using 13 microsatellite markers to investigate 298 colonies from 15 locations across the Nansei Islands in southwestern Japan. Genetic diversity was not significant among sampling locations, even in possibly peripheral locations. In addition, our results showed that there are at least two populations of A. tenuis in the study area. The level of genetic differentiation between these populations was relatively low, but significant between many pairs of sampling locations. Directions of gene flow, which were estimated using a coalescence‐based approach, suggest that gene flow not only occurs from south to north, but also from north to south in various locations. Consequently, the Yaeyama Islands and the Amami Islands are potential northern and southern sources of corals. On the other hand, the Miyako Islands and west central Okinawa Island are potential sink populations. The Kerama Islands and the vicinity of Taketomi Island are potential contact points of genetic subdivision of coral populations in the Nansei Islands. We found that genetic population structure of A. tenuis in the Nansei Islands is more complex than previously thought. These cryptic populations are very important for preserving genetic diversity and should be maintained.

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Section: Discussionmentioning

confidence: 99%

Section: Genetic Diversitymentioning

confidence: 99%

Unexpectedly complex gradation of coral population structure in the Nansei Islands, Japan

Zayasu

Nakajima

Sakai

et al. 2016

Ecology and Evolution

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“…The two coral species selected in this study (A. muricata and A. solitaryensis) are abundant at depths shallower than * 10 m around Japan (Nomura 2009;Yamano and Namizaki 2009;Sugihara et al 2015). Thus, the effect of light availability on these corals around Japan would be relatively small compared to other corals living at deeper depths.…”

Section: Discussionmentioning

confidence: 99%

An improved estimation of the poleward expansion of coral habitats based on the inter-annual variation of sea surface temperatures

et al. 2015

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The poleward expansion of coral habitats has been observed along the Japanese coast since the 1930s. Previous modeling studies have projected a poleward expansion using decadal-mean sea surface temperatures (SSTs) in the coldest months. However, this poleward expansion could be affected by the inter-annual variation of SST in the coldest months, which has not been considered before. In this study, the simulated pattern of poleward expansion was compared between cases where coral mortality was considered based on the inter-annual variation of SST and the decadal-mean SST in the coldest months. Modeled monthly mean SSTs for historical and future global warming simulations from the most recent climate projection model (MIROC4h) were used. The poleward expansion of corals simulated by considering mortality based on the inter-annual variation of SST in the coldest months better reproduced the observed poleward expansion speed compared to the simulations without such a consideration. Our results show the importance of considering coral mortality based on the inter-annual variation of seawater temperature to produce a more realistic poleward expansion of coral habitats.

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“…The paleo‐environmental interpretation based on foraminiferal assemblages is consistent with that based on coral assemblages. The coral assemblage of Unit 2 at outcrop A containing Alveopora spongiosa and Plesiastrea versipora likely indicates a low‐energy fore‐reef slope environment (Nishihira & Veron, ; Sugihara et al, ). The coral assemblage at the base of Unit 3 at outcrop B‐1 dominated by Millepora sp.…”

Section: Discussionmentioning

confidence: 99%

“…The coral assemblage of Unit 3 at outcrop B‐2 is similar to the second assemblage of Unit 3 at outcrop B‐1 and probably indicates a similar depositional environment. The coral assemblage of Unit 3 at outcrop C, characterized by the occurrence of Acropora hyacinthus , suggest a shallow reef environment less than 10 m deep (Iryu et al, ; Nishihira & Veron, ; Sagawa et al, ; Sugihara et al, ; Veron, , ). In addition, Jiju () reports that a coral assemblage in the coral limestone of the Minatogawa Formation near Cape Kyan (Figure b) is composed of Acropora and Pocillopora , associated with Porites and Diploastrea.…”

Section: Discussionmentioning

confidence: 99%

Depositional environments of well‐sorted detrital limestone from the Minatogawa Formation in the southern part of Okinawa Island, the Ryukyu Archipelago, Japan

et al. 2018

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Well‐sorted detrital limestone is one of the typical lithofacies of the latest interval of the Pleistocene Ryukyu Group, which is exposed in the Ryukyu Archipelago in southwestern Japan. The depositional environments of the limestone are interpreted to be extremely shallow and to include back‐reef lagoons or moats and subaerial sand dunes. However, detailed micropaleontological analyses have not been performed on this limestone. In this study, the interpretation of the depositional environments and paleo‐water depths was improved by quantitative examination of foraminiferal assemblages for the well‐sorted detrital limestone of the Minatogawa Formation in the southern part of Okinawa Island. Thin sections of limestone collected from the Minatogawa (Horikawa) quarry were subjected to sedimentological and foraminiferal analyses. Comparison with modern foraminiferal distribution within the Ryukyu Archipelago indicates that back‐reef and fore‐reef dwelling foraminifers characterize the fossil assemblages from the well‐sorted detrital limestone (bioclastic grainstone). Three ratios of indicator foraminiferal taxa (ratios of back‐reef to fore‐reef taxa, planktonic foraminifers to Amphistegina lobifera and Amphistegina lessonii, and Calcarina gaudichaudii to other Calcarina species), as well as multivariate analyses suggest that the well‐sorted detrital limestone was deposited in fore‐reef setting shallower than 40 m in water depth. A comparable depth range was reconstructed from the coral assemblage in the associated coral limestone, suggesting that the Minatogawa Formation was deposited in a gently inclined ramp setting with patch reefs and/or fringing reefs. Stratigraphic changes in paleo‐water depth, together with evidence of several unconformities associated with paleosol layers suggest that there were repeated transgressions and regressions, with an amplitude up to several tens of meters, when the Minatogawa Formation was deposited.

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Zooxanthellate Scleractinian Corals of Jeju Island, Republic of Korea

Cited by 23 publications

References 24 publications

Unexpectedly complex gradation of coral population structure in the Nansei Islands, Japan

Unexpectedly complex gradation of coral population structure in the Nansei Islands, Japan

An improved estimation of the poleward expansion of coral habitats based on the inter-annual variation of sea surface temperatures

Depositional environments of well‐sorted detrital limestone from the Minatogawa Formation in the southern part of Okinawa Island, the Ryukyu Archipelago, Japan

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