[논문]울산 태화강 하구역에 서식하는 대형저서동물의 군집구조

김형철; 최병미; 정래홍; 이원찬; 윤재성; 서인수

doi:10.7837/kosomes.2016.22.6.694

울산 태화강 하구역에 서식하는 대형저서동물의 군집구조
The Community Structure of Macrobenthic Assemblages in the Taehwa River Estuary, Ulsan, Korea 원문보기

海洋環境安全學會誌 = Journal of the Korean society of marine environment & safety, v.22 no.6, 2016년, pp.694 - 707

김형철 (국립수산과학원 어장환경과) , 최병미 ((주)저서생물연구센터) , 정래홍 (국립수산과학원 어장환경과) , 이원찬 (국립수산과학원 어장환경과) , 윤재성 ((주)저서생물연구센터) , 서인수 ((주)저서생물연구센터)

초록
AI-Helper

본 연구는 울산광역시의 태화강을 포함한 하구역에 서식하는 대형저서동물의 군집구조를 파악하기 위하여 2012년 2월부터 동년 11월까지 총 4회에 걸쳐 현장조사를 실시하였다. 태화강 하구역에서는 총 176종/9.6$m^2$ 과 1,992개체/$m^2$ 의 대형저서동물이 출현하였고, 가장 우점한 동물군은 다모류로 출현 종수와 평균 서식밀도는 각각 91종과 1,463개체/$m^2$ 이었다. 태화강 하구역의 주요 우점종은 다모류의 Minuspio japonica($609{\pm}1,221$개체/$m^2$), 참갯지렁이(Hediste japonica, $174{\pm}318$개체/$m^2$), Tharyx sp.1($106{\pm}283$개체/$m^2$), 긴자락송곳갯지렁이(Lumbrineris longifolia, $79{\pm}207$개체/$m^2$), 이매패류의 아기반투명조개(Theora fragilis, $114{\pm}272$개체/$m^2$) 및 단각류의 발성육질꼬리옆새우(Grandidierella japonica, $88{\pm}223$개체/$m^2$ )등이었다. 출현 종과 개체수의 자료를 근거로 대형저서동물의 군집구조를 파악한 결과, 대형저서동물 군집은 크게 3개로 구분되었다. 그룹 I(조립질 퇴적물)과 III(세립질 퇴적물)은 각각 담수 및 해수우세 환경의 군집으로, 그룹 II(혼합질 퇴적물)는 2개 환경이 혼합되는 추이대로 고려할 수 있었다. 결국 태화강 하구역에 서식하는 대형저서동물 군집은 염분농도의 구배와 퇴적상에 따라 구조를 달리함을 알 수 있었다.

Abstract ▼ AI-Helper

This study investigated the community structure of macrobenthic assemblages in the Taehwa River Estuary, Ulsan, Korea. Macrobenthos were collected with a Van Veen Grab Sampler during February and November 2012. The total species number and mean density were $176species/9.6m^2$ and $1,992inds./m^2$, respectively. Polychaetes were the most dominant faunal group in terms of species (91 species) and abundance ($1,463inds./m^2$). The major dominant species were polychaetes Minuspio japonica ($609{\pm}1,221inds./m^2$), Hediste japonica ($174{\pm}318inds./m^2$), Tharyx sp.1 ($106{\pm}283inds/m^2$), Lumbrineris longifolia ($79{\pm}207inds./m^2$), bivalve Theora fragilis ($114{\pm}272inds./m^2$) and amphipod Grandidierella japonica ($88{\pm}223inds./m^2$). Based on community statistics (cluster analysis and non-metric multidimensional scaling (nMDS) ordination), the macrobenthic community was divided into three station groups. Group I(freshwater dominated stations 2-6 with coarse sediment) was characterized by a high abundance of polychaetes Minuspio japonica, Hediste japonica, Capitella capitata, Pseudopolydora kempi, amphipods Grandidierella japonica and Apocorophium acutum. Group II (ecotone, stations 7-9 with mixed sediment) was numerically dominated by bivalve Theora fragilis, polychaetes Cirriformia tentaculata, Tharyx sp.1, Lumbrineris longifolia and Chaetozone sp. Finally, Group III (seawater dominated stations 10-12 with fine sediment) was characterized by a high density of polychaete Magelona japonica. These results showed that changes in salinity gradient and sedimentary characteristics were the main factors behind spatial changes in the macrobenthic communities of the Taehwa River Estuary.

주제어

질의응답

핵심어	질문	논문에서 추출한 답변
	태화강은 어떻게 구분되는가?	태화강은 총 연장 47.54 ㎞의 하천으로 상류구간의 지방하천(36.27 ㎞)과 하류구간의 국가하천(11.27 ㎞)으로 구분되며, 유로면적은 636.96 ㎢로 울산광역시 면적(1,057 ㎢)의 60.
	태화강은 무엇인가?	태화강은 울산광역시 울주군 상북면의 가지산과 두서면의 백운산에서 발원하여 둔기천, 동천 및 여천천 등의 지류가 합류한 후 도심지를 가로질러 최종적으로 동해의 울산만으로 유입된다. 우리나라 하천 중에서 발원지와 끝지점이 동일한 지방자치단체 내에 포함되는 유일한 하천이다. 태화강은 총 연장 47.
	태화강의 특징은 무엇인가?	태화강은 울산광역시 울주군 상북면의 가지산과 두서면의 백운산에서 발원하여 둔기천, 동천 및 여천천 등의 지류가 합류한 후 도심지를 가로질러 최종적으로 동해의 울산만으로 유입된다. 우리나라 하천 중에서 발원지와 끝지점이 동일한 지방자치단체 내에 포함되는 유일한 하천이다.

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