, among which Noctiluca scintillans predominated. Noctiluca scintillans, Acartia omorii, Acartia erythraea, Paracalanus parvus s. l., Centropages abdominalis, Tortanus forcipatus, and Pseudevadne tergestina were the most abundant species detected. Zooplankton diversity was high around the inner regions during the summer, but it was relatively low in the stations located in the outer regions in the autumn. Non-metric multidimensional scaling (nMDS) revealed significant differences in the structures of the zooplankton community among the three regions. Our results showed that the seasonal variations in zooplankton communities in the southern coastal waters of Korea were attributable to seasonal changes in temperature, salinity, chlorophyll a concentrations, and N. scintillans blooms; additionally, this particularly study area might have been specifically influenced by the appearance of the Tsushima Warm Current.
Among diverse amphipod species, cyproideids are grouped together based on the following common char acteristics: peduncular article 2 of antenna 1 is crested dorsally, coxae of gnathopods are rudimentary, immens ely enlarged and broadened coxae of pereopods 3 and 4 occupy lower half of lateral surface, uropod 3 is biramus and has elongate peduncle, and they often has developed dorsal keel on urosomites (Barnard and Karaman, 1991;Azman, 2009;Jung et al., 2015). The genus Cyproidea Haswell, 1879 can be discriminated from others by the presence of carpochelate gnathopod 2, the recolinear ba sis of pereopods 57, and shorter telson. This genus are constituted of eight valid species distributed around the
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