국제항의 항만기초연구를 통한 잠재적 위해외래종의 분포특성

Abstract

Ongoing port baseline surveys are essential for developing ballast water management procedures in order to control unwanted or potentially risky species. This study was designed to search foreign and harmful species and their environmental characteristics from port environment which is vulnerable to ballast water discharged from commercial ships. Communities of phyto- and zooplankton have been investigated seasonally at seaports of Incheon, Gwangyang and Ulsan from 2009 to 2011. During the study period, 25 potentially risky phytoplankton were consisted of 20 red-tide species and 5 toxic species. Distributional features of the red-tide phytoplankton were correlated positively with the physical factors such as salinity, dissolved oxygen and pH (p<0.05). However, distribution of the toxic species was affected positively by chemical factors like nitrate and chemical oxygen demand (p<0.01). From zooplankton, Acartia copepods have been introduced and propagated beyond their natural range due to their ability producing resting eggs. Multiple regression analysis indicated that temperature, salinity, dissolved oxygen and total suspended solid were better predictors of the variation in Acartia species at the seaports during the study than chlorophyll-a concentration when food was not limiting condition. Dinoflagellate Noctiluca scintillans are also internationally recognized as harmful species becautal characteristics from port environment which is vulnerable to ballast water discharged from commercial ships. Communities of phyto- and zooplankton have been investigated seasonally at seaports of Incheon, Gwangyang and Ulsan from 2009 to 2011. During the study period, 25 potentially risky phytoplankton were consisted of 20 red-tide species and 5 toxic species. Distributional features of the red-tide phytoplankton were correlated positively with the physical factors such as salinity, dissolved oxygen and pH (p<0.05). However, distribution of the toxic species was affected positively by chemical factors like nitrate and chemical oxygen demand (p<0.01). From zooplankton, Acartia copepods have been introduced and propagated beyond their natural range due to their ability producing resting eggs. Multiple regression analysis indicated that temperature, salinity, dissolved oxygen and total suspended solid were better predictors of the variation in Acartia species at the seaports during the study than chlorophyll-a concentration when food was not limiting condition. Dinoflagellate Noctiluca scintillans are also internationally recognized as harmful species becau