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Ronald. G. Noseworthy,최광식 한국패류학회 2020 The Korean Journal of Malacology Vol.36 No.2
The little-cone limpet Patelloida conulus (Dunker, 1861) is a member of the Lottiidae, occurring on sandy and muddy tidal flats in the intertidal zone, and is found living symbiotically on shells of mud snails, which often occurs in a high density in sandy and muddy intertidal areas. In this study, we first report association of the little-cone limpets with mud snails from an intertidal sandy beach at Sungsan on the northeast coast of Jeju Island. At the upper intertidal area, the common mud snail Batillaria attramentaria (G. B. Sowerby I, 1855) occurred at a high density, and P. conulus was found on the shell surface. Shell height of the little-cone limpet ranged from 2.6 to 6.6 mm (N = 7), and the host snail carried one P. conulus on its shell in most cases. The little-cone limpet and the mud snail association has been regarded as being restricted to the Batillariidae, while we observed for the first time the occurrence of P. conulus on the cerithiid snail Rhincoclavis kochi (Philippi, 1848).
Ronald. G. Noseworthy,최광식 한국패류학회 2018 The Korean Journal of Malacology Vol.34 No.1
Tide pools in the rocky intertidal of Jeju Island are characterized by a rich molluscan biodiversity, often associated with macro algae; however, few studies have reported on the unique algae-mollusk association in tide pools in Jeju Island. In May 2012, we collected mollusk species associated with the coralline algae Corallina confusa Yendo, 1902 from a tide pool at Hamo beach on the south-west coast of Jeju Island. A total of 24 species associated with the coralline algae were identified, including one chiton in the Mopaliidae, 4 bivalves, and 19 gastropods. Most of the molluscs isolated from the coralline algae were juvenile and sub-adults, suggesting that C. confusa clusters in tide pools are utilized as a shelter or source of food for grazing gastropods.
REPORT OF Malleus regula (FORSSKÅL IN NIEBUHR, 1775) (BIVALVIA: MALLEIDAE) IN KOREA
Noseworthy, Ronald G.,Waki, Tsukasa,Nobuhisa, Kajino,Choi, Kwang-Sik The Malacological Society of Korea 2016 The Korean Journal of Malacology Vol.32 No.4
The bivalve Malleus regula ($Forssk{\aa}l$ in Niebuhr, 1775) is reported for the first time from Korea. This is the second species of Malleidae reported from this country. Since the species is quite variable, comparisons were made with the original description and descriptions in the literature; some taxonomic comments were also made. Global warming and possible changes in the northward-flowing Tsushima Current may account for the addition of new mollusk species to the island's fauna.
Noseworthy Ronald G.,홍현기,주세종,양현성,최광식 한국해양과학기술원 2023 Ocean and Polar Research Vol.44 No.4
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.
REPORT OF Malleus regula (FORSSKÅL IN NIEBUHR, 1775) (BIVALVIA: MALLEIDAE) IN KOREA
Ronald. G. Noseworthy,Tsukasa Waki,Kajino Nobuhisa,최광식 한국패류학회 2016 The Korean Journal of Malacology Vol.32 No.4
The bivalve Malleus regula (Forsskål in Niebuhr, 1775) is reported for the first time from Korea. This is the second species of Malleidae reported from this country. Since the species is quite variable, comparisons were made with the original description and descriptions in the literature; some taxonomic comments were also made. Global warming and possible changes in the northward-flowing Tsushima Current may account for the addition of new mollusk species to the island’s fauna.
Ronald. G. Noseworthy,홍현기,Shashank Keshavmurthy,이희정,정희도,주세종,김종빈,정석근,최광식 한국해양과학기술원 2016 Ocean science journal Vol.51 No.1
Corals reefs and communities support a wide range of flora and fauna. The complete richness and abundance of faunal communities in either coral reefs or communities is not fully understood. This is especially true for high-latitude coral communities. In this work, we carried out an analysis of an Alveopora japonica associated mollusk assemblage, in Jeju Island, Korea. A. japonica is one of the major coral species present in high abundance (88–155 colonies m-2), with a high recruitment rate (7.8 juvenile corals m-2 yr-1) in Jeju Island, and may serve as a habitat for other benthic organisms. In 2012, a total number of 579 A. japonica colonies with sizes ranging between 15.1346.7 cm2 in the surface area were collected from a 1m× 10m quadrat installed at a depth of 10 m at Keumneung, on the northwest coast of Jeju Island. Numerous benthic invertebrates were found to be associated with A. japonica colonies. Twenty-seven bivalves and gastropods were identified, including a boring mytilid, Lithophaga curta, and an arcid, Barbatia stearnsi. A zonalgeographical examination of the distribution ranges of these mollusks revealed a majority of warmer water species. Our observations also showed that A. japonica may be providing a habitat to grazing gastropod, Turbo cornutus, and encrusting Spondylidae and Chamidae bivalves. A. japonica forms a coral carpet with a distinct assemblage of bivalves. It is thought that the presence of these mollusks species in the coral indicates its use as a nursery for juvenile species, a ready food supply of organic detritus, and a refuge from predators.
Ronald. G. Noseworthy,주세종,최광식,Mostafizur Rahman Mondol 한국패류학회 2012 The Korean Journal of Malacology Vol.28 No.2
The neritid species Clithon retropictus inhabits rivers and estuaries along the southern coast of the Korean mainland but has not been previously reported from Jeju Island. In 2007 and 2011 specimens of this species were obtained from two separate localities on the south coast of the island. Comparisons were made with von Martens’ original description, specimens from the Korean mainland, and illustrations and descriptions in the literature. Although there were some differences in color and markings, and slight differences in morphology, the specimens from Jeju Island compare well with those from the mainland and in the literature. The shells of this species become more ovate and more eroded with age. In one locality, a small river, specimens of the pleurocerid Semisulcospira libertina (Gould, 1859), were found adjacent to, and coexisting with, a population of C. retropictus, an association that often occurs. The occurrence of Clithon retropictus represents a range extension to Jeju Island.
Ronald. G. Noseworthy,이희중,최광식 한국해양과학기술원 2013 Ocean science journal Vol.48 No.3
Clithon retropictus is a neritid gastropod inhabiting mainly brackish water. Currently this species has been listed as a second grade endangered species of wildlife in Korea by the Ministry of Environment, due to the decrease in its population size. C. retropictus has previously been identified from estuaries on the south coast of Korea. In Jeju Island, this species has been reported only from the south coast. However, a population has recently been discovered on the north coast of the island in an apparently new type of habitat, under rocks adjacent to a dry riverbed on a muddy substrate. C. retropictus was found to be aggregated under some of the larger rocks, and the habitat was located near the high tide line. The present study reports some possible reasons for the occurrence of the population in this unusual habitat, and provides useful information on the biometry and population size which can be used in the management of this endangered species.
이희중,Ronald. G. Noseworthy,박상률,홍현기,이병걸,최광식 한국패류학회 2014 The Korean Journal of Malacology Vol.30 No.1
In the present study, we surveyed the molluscan fauna in a lagoon located near Seong-san harbor on the east coast of Jeju Island in July 2012. For the survey, a 25 x 25 cm quadrat was deployed over 3 randomly selected sites in the intertidal area of the lagoon. Sediment from the surface to a depth of 25 cm in the quadrat was removed and sieved using a 1 mm mesh sieve. All molluscan fauna retained on the sieve was identified to the species level. From the survey, 25 species of mollusca belonging to 2 orders and 16 families were identified. Species richness, in terms of total number of species, was found to be the highest at sampling site 1, where the substrate was composed of coarse sand and some rocks, while it was lowest at sampling site 3, composed of compact fine sand. Regardless of the type of substrate at the sampling sites, the mud-creeping snail Batillaria cumingii (Crosse, 1862) occurred at a high density, ranging from 324-468 ind./m2. The luciniid bivalve Pillucina pisidium also occurred at a high density at sampling site 1, at 336 ind./m2, while the density of this species was only 4 ind./m2 at sampling site 3. The Manila clam Ruditapes philippinarum could be found at all 3 sampling sites with very low density ranging from 16-48 ind./m2. The density and species richness of molluscs observed in this study was lower compared to the previously reported molluscan fauna in Jeju Island, suggesting that further investigation needs to be carried out to conserve the unique marine lagoon ecosystem in Jeju Island.