진해만 자어 군집의 계절 변동
Seasonal Variation of Larval Fish Community in Jinhae Bay, Korea
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초록
진해만에서 출현하는 자어에 대한 계절별 군집 변동을 파악하기 위해 2015년과 2016년의 2월(겨울철), 5월(봄철), 8월(여름철), 그리고 11월(가을철)까지 계절별로 수행하였다. 조사기간 동안 출현한 자어는 종 수준까지 총 24과 28종이 출현하였다. 조사기간 동안 출현한 우점종은 청어(Clupea pallasii), 꼼치(Liparis tanakae), 돛양태과 sp. (Callionymidae sp.), 청보리멸(Sillago japonica), 세줄베도라치(Ernogrammus hexagrammus), 그리고 멸치(Engraulis japonica)로 나타났으며, 이들 6종은 조사기간 중 출현한 자어 전체 출현개체수의 77.6%를 차지하였다. 우점종 중 청어와 꼼치는 2015년과 2016년의 겨울철에 출현한 반면에 청보리멸은 여름철에 출현하였다. 종 다양도 지수는 2월과 8월에 높았고 5월에 낮게 나타났다. 조사기간 동안 출현한 자어의 출현개체수를 바탕으로 nMDS 분석을 실시한 결과 계절에 따른 4개의 그룹으로 구분되었다. 본 연구결과 진해만의 자어 군집은 계절에 따른 수온변화와 산란에 참여하는 어종에 따라서 변동하였으며, 잠도와 칠전도 북부해역에서 높은 출현량을 보여 이 지역이 진해만의 주요 산란장으로 이용되고 있음을 의미한다.
Abstract
Seasonal variations in the community structure of larval fish assemblage in Jinhae Bay were investigated in February, May, August and November of 2015, and in the same months in 2016. During the study period, a total of 28 larvae species belonging to 24 families were collected. The dominant species were Clupea pallasii, Liparis tanakae, Callionymidae sp., Sillago japonica, Ernogrammus hexagrammus and Engraulis japonica. These six species accounted for 77.6% of the total number of larvae during the survey period. The larvae of C. pallasii and L. tanakae were exclusively caught in February 2015 and 2016, while those of Apogon lineatus and Sillago japonica were exclusively caught in August 2015 and 2016. Overall, species diversity of the fish larvae was highest in February and August, although it was relatively low in May. The results of the non-metric multidimensional scaling (nMDS) analysis using the number of individual larval fish showed that they are divided into four seasonal groups. Our results showed that the community of larval fish in Jinhae Bay was affected by seasonal changes in temperature and the emergence of spawning fish species. Additionally, we suggest that the high abundance of larval fish came from around Jam-do and the northern part of Chilcheon-do; these locations are the main spawning grounds of Jinhae Bay.
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