CAJ | 학술논문

根据2011年5月在胶州湾进行的底拖网调查,应用碳、氮稳定同位素技术对胶州湾方氏云鳚(Enedrias fangi)的食物组成、营养级和摄食习性的体长变化等方面进行研究。结果表明,胶州湾方氏云鳚的δ15N 值范围是10.14‰~15.50‰,跨度为5.36‰,平均值为(12.83±1.10)‰；δ13C值范围是–21.52‰~–18.14‰,跨度为3.38‰,平均值为(–20.42±0.73)‰。方氏云鳚的饵料生物主要包括鲜明鼓虾(Alpheus distinguendus)、鹰爪虾(Trachypenaeus cur-virostris)、海蜇虾(Latreutes anoplonyx)、疣背宽额虾(Latreutes planirostris)、沙蚕、粒径大于900μm的浮游动物,其中以海蜇虾和粒径大于900μm的浮游动物为主,贡献率分别为47%~66%和35%~40%；其他饵料生物的重要性由高到低依次为沙蚕、疣背宽额虾、鹰爪虾和鲜明鼓虾,其贡献率分别为0%~15%、0%~5%、0%~5%、0%~2%。经Pearson 相关性检验发现,δ15N 与方氏云鳚的体长无显著相关(P>0.05),而δ13C 与方氏云鳚体长呈显著正相关(P<0.05)。以δ15N计算方氏云鳚各体长组的营养级范围为3.33~3.79,平均营养级为3.65±0.14,并不随着鱼体长的增加而升高。与以往的研究相比，方氏云鳚的食物组成和营养级均发生了一定程度的变化，基础饵料生物的波动和分析方法的不同可能是导致变化的主要原因。另外，基线生物、富集度以及样品数量和体长范围的不同也是导致方氏云鳚营养级存在差异的原因之一。本研究旨在深入了解方氏云鳚在胶州湾生态系统中所处的地位和作用，为今后深入研究胶州湾生物群落的营养结构以及食物网的物质循环和能量流动提供基础资料。
근거2011년5월재효주만진행적저타망조사,응용탄、담은정동위소기술대효주만방씨운위(Enedrias fangi)적식물조성、영양급화섭식습성적체장변화등방면진행연구。결과표명,효주만방씨운위적δ15N 치범위시10.14‰~15.50‰,과도위5.36‰,평균치위(12.83±1.10)‰；δ13C치범위시–21.52‰~–18.14‰,과도위3.38‰,평균치위(–20.42±0.73)‰。방씨운위적이료생물주요포괄선명고하(Alpheus distinguendus)、응조하(Trachypenaeus cur-virostris)、해철하(Latreutes anoplonyx)、우배관액하(Latreutes planirostris)、사잠、립경대우900μm적부유동물,기중이해철하화립경대우900μm적부유동물위주,공헌솔분별위47%~66%화35%~40%；기타이료생물적중요성유고도저의차위사잠、우배관액하、응조하화선명고하,기공헌솔분별위0%~15%、0%~5%、0%~5%、0%~2%。경Pearson 상관성검험발현,δ15N 여방씨운위적체장무현저상관(P>0.05),이δ13C 여방씨운위체장정현저정상관(P<0.05)。이δ15N계산방씨운위각체장조적영양급범위위3.33~3.79,평균영양급위3.65±0.14,병불수착어체장적증가이승고。여이왕적연구상비，방씨운위적식물조성화영양급균발생료일정정도적변화，기출이료생물적파동화분석방법적불동가능시도치변화적주요원인。령외，기선생물、부집도이급양품수량화체장범위적불동야시도치방씨운위영양급존재차이적원인지일。본연구지재심입료해방씨운위재효주만생태계통중소처적지위화작용，위금후심입연구효주만생물군락적영양결구이급식물망적물질순배화능량류동제공기출자료。
Jiaozhou Bay is an important spawning and feeding ground for many commercially important species. How-ever, intensive fishing has had significant effects on its fishery resources. The marine species living in this bay have decreased sharply over several decades. Despite the importance and drastic changes in this bay, little information is available about the feeding habits of most fish species inhabiting this area. Stable isotope analysis has become a power-ful tool for studying the feeding habits of fishes. The stable carbon isotope composition of consumers shows the deriva-tion of food, while the nitrogen isotope composition indicates the trophic level in the food web. The method can over-come some of the limitations associated with traditional stomach contents analysis. In this study, carbon and nitrogen stable isotope analyses were employed to explore the feeding habits of Enedrias fangi in Jiaozhou Bay based on sam-ples collected from a bottom trawl survey in May 2011. δ15N and δ13C values for E. fangi ranged from10.14‰ to 15.50‰(12.83‰±1.10‰), and from?21.52‰to?18.14‰(?20.42‰±0.73‰), respectively. The main food sources of E. fangi were Alpheus distinguendus, Trachypenaeus curvirostris, Latreutes anoplonyx, L. planirostris, Nereididae and zooplankton (>900μm). Among them, L. anoplonyx and zooplankton were the most important prey items for E. fangi, accounting for 47%?66% and 35%?40% of food composition, respectively. A Pearson correlation test indicated that there was significant positive relationship between the standard length of E. fangi andδ13C values (P<0.05), while no significant correlation was found between standard length and δ15N values (P>0.05).The trophic levels of E. fangi in different size classes ranged from 3.33 to 3.79, with the average trophic level being 3.65±0.14. The trophic levels did not increase with the size classes. Compared with previous studies, the food composition and trophic levels of E. fangi had experienced great changes, and the fluctuation of prey sources and the difference in analysis methods might be the main reason. Furthermore, the variations in trophic levels were also related to the difference in isotope baseline, isotope enrichment, sample size, and standard length of E. fangi.