서로 다른 배지에서의 성장률 결과를 이용해서 선박평형수를 통해 유입되는 식물플랑크톤이 잠재적 침입 위협 가능성 평가

Abstract

We investigated the possibility of invasion success of phytoplankton from ballast water of commercial ships. Some live phytoplankton samples were collected and reintroduced in ballast water, shipside port water, and nutrient-enriched F/2 medium and incubated in various water temperatures over 2 weeks. Assessment of phytoplankton invasion and establishment was conducted by taking into account of various scenarios of port water dilution rate and time delay for exponential growth of the plankton. Most of ballast water samples originated in countries such as China and Japan that are adjacent to South Korea, and diatoms dominated. The age of ballast water from which the water samples were taken for growth experiment ranged from 3 to 365 days, with half of them (6 vessels) from short voyages (<10 days). Many phytoplankton species survived and did growth well under various environmental water temperatures and in various types of water. Especially, small phytoplankton and diatom species dominated in most of phytoplankton re-growth experiments. The survival and growth of phytoplankton communities in the Korean port environment was assessed, and this result suggests that the growth of a particular phytoplankton community once introduced by ballast water may depend mostly on nutrient levels and water temperature, but less on salinity. Therefore, both high nutrient concentration and water temperature may significantly shorten thdium and incubated in various water temperatures over 2 weeks. Assessment of phytoplankton invasion and establishment was conducted by taking into account of various scenarios of port water dilution rate and time delay for exponential growth of the plankton. Most of ballast water samples originated in countries such as China and Japan that are adjacent to South Korea, and diatoms dominated. The age of ballast water from which the water samples were taken for growth experiment ranged from 3 to 365 days, with half of them (6 vessels) from short voyages (<10 days). Many phytoplankton species survived and did growth well under various environmental water temperatures and in various types of water. Especially, small phytoplankton and diatom species dominated in most of phytoplankton re-growth experiments. The survival and growth of phytoplankton communities in the Korean port environment was assessed, and this result suggests that the growth of a particular phytoplankton community once introduced by ballast water may depend mostly on nutrient levels and water temperature, but less on salinity. Therefore, both high nutrient concentration and water temperature may significantly shorten th