• Animal Systematics, Evolution and Diversity
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• 제22권1호
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• pp.63-78
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• 2006

Three new species of poecilostomatoid copepods are described as associates of the scleractinian coral Gardineroseris planulata (Dana) from the Moluccas: Sociellus geminus n. sp., Odontomolgus mucosus n. sp. and O. unioviger n. sp. The genus Sociellus is transferred from the Rhynchomolgidae to the Anchimolgidae. The previously described four species of the genus Paramolgus (P. angustus, P. eparmatoides, P. gibberulus, and P. setellus) of the Rhynchomolgidae, associated with Gardineroseris planulata, are transferred as well to the genus Anchimolgus in the Anchimolgidae.

• Ocean and Polar Research
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• 제44권4호
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• pp.331-338
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• 2022

The high latitude scleractinian coral Alveopora japonica Eguchi, 1965 occurs in high density in the shallow rocky subtidal in Jeju Island, forming coral carpets. Despite its ecological role providing a unique habitat for other benthic organisms, the benthic fauna associated with the A. japonica coral carpet is poorly known. To identify fauna associated with the coral carpet, we explored three sites dominated by A. japonica and one control site on northwestern Jeju Island in May 2013. Using SCUBA, we collected A. japonica and the epibenthic mega-fauna associated with the colonies in 1×1 m² and identified them to the species level. At a depth of 10 to 15 m, A. japonica colonies heavily covered the seafloor, forming a layer called a coral carpet, with a density of 94 (Keumneung-ri), 133 (Biyangdo), and 155 (Gwidok-ri) colonies/m². Thirty-four molluscan species were identified from the four sites, including 20 bivalves and 14 gastropods. The coral carpets were enriched with sessile bivalves compared to the control site, as we identified twenty bivalve and eight gastropod species from the coral carpets. Most bivalve species associated with the coral carpets had tropical-subtropical affinities, while gastropods were mainly subtropical and subtropical-low boreal species. Leiosolenus lischkei M. Huber, 2010, in the family Mytilidae and Barbatia steamsi (Pilsbry, 1895), in the family Arcidae, were the two most abundant bivalve species in the coral carpet, L. lischkei being a borer, and B. stearnsi a nestler. The tropical to subtropical Pacific star shell Astralium haematragum (Menke, 1829)was the most abundant gastropod at the study sites. The bivalves and gastropods associated with the coral carpet were small-sized juveniles or sub-adults, suggesting that the coral carpet provides a micro-habitat for the bivalves and gastropods.

• Ocean and Polar Research
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• 제35권2호
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• pp.85-92
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• 2013

The coral symbiotic algae zooxanthellae is often expelled from the host as the host coral is under physiological stress, causing the coral to turn completely white. Such coral bleaching events are occurring more frequently with the increase in the global warming, ocean acidification and increased level of anthropogenic impacts such as eutrophication. In the present study, we investigated the effects of inorganic nutrients including ammonium, nitrate, phosphate and elevated water temperature on the symbiotic zooxanthellae density in the fragment of branching coral Acropora nobilis. Zooxanthellae density in the host coral decreased 8 hrs after the experiment at a given elevated water temperature ($32^{\circ}C$, p < 0.05). In contrast, no clear coral bleaching or decrease in the symbiotic algae density was observed from the branching coral exposed to a normal water temperature of $30^{\circ}C$ and high levels of nutrients such as 20 ${\mu}M$ of $NH_4Cl$, 20 ${\mu}M$ of $NaNO_3$ and, 10 ${\mu}M$ $KH_2PO_4$. Accordingly, the data indicated high water temperature is one of the stressful factors to cause bleaching in A. nobilis, whereas the high levels of nutrients is not a factor. It is believed that the results obtained in the present study are useful as baseline information in the management of the coral reefs.

• Animal Systematics, Evolution and Diversity
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• 제20권2호
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• pp.109-140
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• 2004

오스트레일리아의 대보초에서 채집된 무척추동물로부터 나온 요각류 7신종을 기재하였다. 이 요각류들은 석산호 Pocillopora verrucosa (Ellis and Solander)에 공생하는 Panjakus bidentis, 석산호 Acropora squarrosa (Ehrenberg)에 공생하는 Scyphuliger humesi, S. vicious 및 S. placidus, 복족류 Glossodoris atromarginata (Cuvier)에 공생하는 Doridicola parapatulus, 바다맨드라미 일종에 공생하는 Ruhtra germinata, 그리고 바다나리 Comanthina belli (Carpenter)에 공생하는 Collocheres oribullatus이다.

• Animal cells and systems
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• 제8권3호
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• pp.165-186
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• 2004

Five new species of copepods associated with marine invertebrates are described from shallow water of the Pacific coast of Panama. They are Pseudomacrochiron pocilloporae n. sp., Acontiophorus panamensis n. sp. and Asterocheres urabensis n. sp. associated with the scleractinian coral Pocillopora damicornis (Linnaeus), Asterocheres pilosus n. sp. associated with the echinoid Eucidaris thouarsii (Valenciennes), and Asterocheres walteri n. sp. associated with the sea star Oreaster brevispinis.

• Animal Systematics, Evolution and Diversity
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• 제38권1호
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• pp.46-49
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• 2022

This study newly records a deep-sea coral, Flabellum (Ulocyathus) deludens from Korea. The specimens were collected by trawling at a depth of 100 m off Jejudo Island in 2019. The newly recorded species is described and compared with the other similar consubgeneric species in detail based on morphological characteristics, including corallum size, calicular diameter, calicular edge, face angle, edge angle, and septal arrangement. Flabellum(Ulocyathus) deludens is characterized by its solitary, highly compressed, wedge-shaped corallite with a small cylindrical pedicel, radiating inverse chevron-patterned lateral stripes on thecal faces, highly jagged calicular edges, and hexameral septal arrangement in five cycles. As a result of this study, five species in the family Flabellidae have been recorded from Korea.

• Animal cells and systems
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• 제15권4호
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• pp.315-324
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• 2011

The actiniarian sea anemone, Entacmaea quadricolor, and the scleractinian coral, Alveopora japonica, host symbiotic dinoflagellates belonging to the genus Symbiodinium (Freudenthal). We studied the host-symbiont specificity of these two anthozoan hosts in the northwestern Pacific Ocean. Symbionts within the two hosts were identified using partial large subunit (LSU) ribosomal DNA (rDNA) and complete internal transcribed spacers (ITS) 1 rDNA regions. The host, E. quadricolor, was identified using the partial LSU rDNA molecular marker. Genetic analysis showed that E. quadricolor only harbors dinoflagellates belonging to subclade C1/3 of the genus Symbiodinium. Moreover, no genetic variation was detected among the symbionts of E. quadricolor within the study region (Korea and Japan), even though the two distant sites were separated by more than 1000 km, at collection depths of 1 m in shallow and 13-16 m in deep water. Whilst scleractinian corals host multiple Symbiodinium clades in tropical waters, A. japonica, sampled over a wide geographical range (800 km) within the study region, only hosts Symbiodinium sp. clade F3. The high specificity of endosymbionts in E. quadricolor and A. japonica within the northwestern Pacific Ocean could be accounted for because symbiotic dinoflagellates within the host anemones appear to be acquired maternally, and the Kuroshio Current might affect the marine biota of the northwestern Pacific. However, the consistency of the symbiotic relationships between these two anthozoan hosts and their endosymbionts could change after climate change, so this symbiotic specificity should be monitored.