Intertidal meiofauna of Jeju Island, Korea

Abstract

For the first time, the structure of the meiobenthos community and marine nematodes in particular was investigated in the different intertidal zones of Jeju Island (South Sea of Korea). A relationship was found between the density of meiobenthic communities and the type of the bottom sediment. In addition, in the silty sediments, nematodes were dominant, while in the sandy sediments harpacticoids and ostracods were dominant groups. Sixty eight species belonging to 60 genera and 19 families of nematodes were found in the whole area. Four different nematode taxocenosis were distinguished using a cluster analysis. Dominant feeding groups were omnivores (2B) and epistratumfeeders (2A). The highest number of non-selective depositfeeders (1B) was detected in the lagoon with the bottom silty sediments.

Habitat Preferences and Growth ofRuditapes bruguieri(Bivalvia: Veneridae) at the Northern Boundary of Its Range

“…Here, shells of the clam R. bruguieri were not found. Silt constitutes 1% of the weight of dry soft sediments [ 15 ]. In the open bay, the littoral bottom sediments consist of middle-grained sand between volcanic reefs (basalt tectonic plates).…”

“…In the open bay, the littoral bottom sediments consist of middle-grained sand between volcanic reefs (basalt tectonic plates). Silt makes up 2% of the weight of dry soft sediments [ 15 ]. Here, a total of 117 clam shells were collected in 2007, 2008, and 2012.…”

“…The open southern site was on Namo Beach (33°12′34.82′′N, 126°15′45.64′′E). Here, the littoral coastal bottom sediments consist of grey middle- and fine-grained sand in the upper-tide and mid-tide level, passing into silt (>63% of the weight of dry sediments) in the low-tide level [ 14 , 15 ]. Only two clam shells were found in 2008.…”

“…One northwestern site was situated on Geumneung Beach (Hallim Park) (33°23′23.07′′N, 126°13′48.38′′E), opposite to small Biyangdo Island. It is an open bay with the coastal bottom sediments composed of light coarse- and middle-grained sand with small admixture of silt (about 0.1%) among big volcanic boulders [ 14 , 15 ]. Other sites on the northwestern coast of Jeju Island were situated on Kwakji Beach (33°27′05′′N 126°18′21′′E) and Hyupchae Beach (33°23′35′′N 126°14′14′′E).…”

Population structure and life history of Neomysis nigra Nakazawa, 1910 (Mysida) on Jeju Island, South Korea

“…Fresh water irregularly flows into this area from nearby streams, bringing nutrients into the area so that the productivity of macroalgae and seagrasses, such as Ulva sp. and Zostera marina Linnaeus, 1753, is high (Lee, 2006;Pavlyuk & Trebukhova, 2011). The macroalgae and seagrasses of the area provide shelters for many fish and crustaceans.…”