황해 연안역 서식종인 요각류 Acartia hongi의 분포확장

Abstract

Even though calanoid copepod Acartia hongi has been known as species which mostly inhabit in the coastal waters of the Yellow Sea, information about potential dispersion range of the species is lack. Thus, we investigated distributional pattern of A. hongi seasonally at three seaports during 2007-2009 and in offshore waters of the Yellow Sea in spring and summer of 2010-2012. Zooplankton samples were collected with standard net (200 ㎛ mesh, 60㎝diameter) in offshore waters and at Incheon seaport in the Yellow Sea, Gwangyang seaport in the South Sea, and Ulsan seaport in the southwestern East Sea.Occurrence of the species with high abundances (1-10,867 inds.m-3) at Incheon seaport was coincident with previous records, whereas its occurrence at seaports of Gwangyang and Ulsan was unusual beyond their bioregion. Especially, the species showed up in the high range (102-1,654 inds.m-3) of abundance at Gwangyang seaport in spring 2007, while abundances less than 10 inds.m-3 occurred transiently at Ulsan seaport in 2007. At two latitudes from coastal waters to seaward stations (34.5 and 36°N, 124.5 and 125.5 °E) in the Yellow Sea, A. hongi occurred only at coastal station of north latitude whereas it distributed at all stations of south latitude with decreasing abundances seaward in the range of 1-302 inds.m-3 during 2010-2012. These results indicate that distributional range of A. hongi was pattern of A. hongi seasonally at three seaports during 2007-2009 and in offshore waters of the Yellow Sea in spring and summer of 2010-2012. Zooplankton samples were collected with standard net (200 ㎛ mesh, 60㎝diameter) in offshore waters and at Incheon seaport in the Yellow Sea, Gwangyang seaport in the South Sea, and Ulsan seaport in the southwestern East Sea.Occurrence of the species with high abundances (1-10,867 inds.m-3) at Incheon seaport was coincident with previous records, whereas its occurrence at seaports of Gwangyang and Ulsa