CAJ | 학술논문

管水母是海洋浮游动物中的重要类群，通常可作为海流或水团的指示种，其分布受温度、盐度和食物的影响。本文根据2011年4月在东印度洋海域（5°S～5°N，80°～98．5°E）26个站的调查资料，分析了管水母种类组成、丰度分布和群落结构特征。共鉴定管水母37种，以热带大洋广布种和赤道种为主，其中扭形爪室水母 Chelophyes contorta 、巴斯水母 Bassia bassensis 、双小水母 Nanomia bijuga 和短深杯水母Abylopsis eschscholtzi 是调查海域的优势种。依据调查站位设置及环境特征，将调查海域分东部断面、赤道断面和西部断面3个区域。各个调查站种数变化范围为2～14种，东部和西部断面的种类较丰富，而赤道断面近岸区种数低，离岸区种数增多。管水母的平均丰度为（1．04±0．58）个/m3，分布不均匀，东部断面和西部断面的丰度比赤道断面高，特别是赤道断面近岸区丰度在1．0个/m3以下。调查海区的管水母属于比较典型的热带大洋性生态类群。群落结构分析表明，东部和西部断面的群落结构相似度较高，二者与赤道断面的相似度均较低。调查海域管水母种类和丰度的分布受水文和生物环境因子的综合影响。双小水母 Nanomia bijuga 可作为东部断面和赤道断面近岸区沿岸水团的指示种，锥体浅室水母Lensia conoides 和褶玫瑰水母Rosacea plicata 可作为西部断面100 m 以下涌升水团的指示种。
관수모시해양부유동물중적중요류군，통상가작위해류혹수단적지시충，기분포수온도、염도화식물적영향。본문근거2011년4월재동인도양해역（5°S～5°N，80°～98．5°E）26개참적조사자료，분석료관수모충류조성、봉도분포화군락결구특정。공감정관수모37충，이열대대양엄포충화적도충위주，기중뉴형조실수모 Chelophyes contorta 、파사수모 Bassia bassensis 、쌍소수모 Nanomia bijuga 화단심배수모Abylopsis eschscholtzi 시조사해역적우세충。의거조사참위설치급배경특정，장조사해역분동부단면、적도단면화서부단면3개구역。각개조사참충수변화범위위2～14충，동부화서부단면적충류교봉부，이적도단면근안구충수저，리안구충수증다。관수모적평균봉도위（1．04±0．58）개/m3，분포불균균，동부단면화서부단면적봉도비적도단면고，특별시적도단면근안구봉도재1．0개/m3이하。조사해구적관수모속우비교전형적열대대양성생태류군。군락결구분석표명，동부화서부단면적군락결구상사도교고，이자여적도단면적상사도균교저。조사해역관수모충류화봉도적분포수수문화생물배경인자적종합영향。쌍소수모 Nanomia bijuga 가작위동부단면화적도단면근안구연안수단적지시충，추체천실수모Lensia conoides 화습매괴수모Rosacea plicata 가작위서부단면100 m 이하용승수단적지시충。
Siphonophores,the major constituent of the zooplankton community,are a widespread and abundant group of colonial gelatinous cnidarians that play important roles in the trophic web of the pelagic realm.It has been ob-served that some species of siphonophores could be used as indicators to certain types of waters and ocean current in a particular region.The distribution of siphonophores is influenced by hydrological and biological process,such as temperature,salinity and chlorophyll a concentration.This study aimed to examine the species composition,abun-dance distribution and community structure of siphonophore based on the data obtained from the tropical northeast Indian Ocean in April to May,2011.A total of 37 species of siphonophore were identified characterized by the eco-logical groups with tropical widespread and equator species.The dominant species were mainly represented by Che-lophyes contorta ,Bassia bassensis ,Nanomia bijuga and Abylopsis eschscholtzi .The study area could be divided in-to three transects:eastern,equator and western transects based on the sampling stations and environmental condi-tion.The range of species richness was from 2 to 14,with the high diversity at eastern and western transects,and the increasing trend from the nearshore to offshore at equator transect.An average of siphonophore abundance was (1.04±0.58)ind/m3 ,with an uneven distribution characterized by high values at eastern and western transects and low values at equator transect.The similarity percentage of community structure between the eastern and western transects was high than equator transect.The results suggested that the distribution of siphonophore was considered to be the result of physical and biological factors.Nanomia bijuga could be regarded as an indicator species for coastal waters at eastern transect,and Lensia conoides & Rosacea plicata for uplifted cold waters in the western transect.