摘要
以2008年5月、8月、11月和2009年2月东海灯光围网采集到的453条东海竹筴鱼为研究对象,对其胃含物进行分析,应用K-W非参数检验、卡方检验、聚类分析等方法,对不同季节和发育阶段条件下东海竹筴鱼的食性进行研究.结果表明:东海竹筴鱼的饵料生物有124种(包括未鉴定种),浮游甲壳类和小型鱼类为其主要饵料类群.优势饵料生物依次是麦氏犀鳕(IRI%=39.2%)、长尾类糠虾幼体(IRI%=18.4%)、短尾类大眼幼体(IRI%=7.6%)和太平洋磷虾(IRI%=6.6%)等.季节和叉长对东海竹筴鱼的摄食强度均有显著影响(P<0.01),东海竹筴鱼春季摄食强度最高,而冬季最低;叉长140～159 mm的竹筴鱼摄食强度最高,叉长45～99 mm的幼鱼的摄食强度较高,其余叉长的鱼摄食强度相对较低.聚类分析结果表明,叉长100 mm是东海竹筴鱼摄食取向的拐点.东海竹筴鱼四季的平均营养级为3.51,属于低级肉食性鱼类.
A total of 453 Trachurus japonicus specimens with a fork length （FL） of 46-250 mm were sampled in the seasonal light seine net surveys in the East China Sea in May, August, and November, 2008 and in February, 2009. The stomach contents of the specimens were analyzed, and the seasonal and ontogenetic variations in the feeding the Kruskal-Wallis test, chi-squared test, and cluster habits of the T. japonicus were examined by analysis. There were 124 prey species （including not identified） ingested by the T. japonicus, among which, planktonic crustaceans and small-scale marine fish made up the dominant prey groups. According to the percentage index of relative importance （IRI%）, Bregmaceros macclellandi was the most dominant prey, accounting for 39.2%, followed by Macrura mysis larva （ 18.4% ）, brachyura zoea larva （7.6%）, and Euphausia pacifica （6.6%）. The feeding intensity of the T. japonicus varied significantly with its FL and season, being the highest for the T. japonicus with a FL of 140-159 mm, higher for the T. japonicus juveniles with a FL of 45-99 ram, while lower for the T. japonicus of other size classes, and the highest in spring and the lowest in winter. Cluster analysis revealed there was an abrupt change in the diet composition for the T. japonicus with a FL of about 100 mm FL. The average trophic level of the T. japonicus in four seasons was 3.51, indicating that the T. japonicus in the East China Sea was of low-level carnivores feeding on plankto and nekton.
出处
《应用生态学报》
CAS
CSCD
北大核心
2013年第7期2015-2024,共10页
Chinese Journal of Applied Ecology
基金
国家科技支撑计划项目(2007BAD43B01)
国家海洋公益性行业科研专项(201005013-2)
浙江渔场资源动态研究项目(2011F30001)
浙江省自然科学基金项目(LY13D060006)
东渔政项目(2011-123)
浙江省创新团队建设与人才培养项目(2011F20031)资助
关键词
竹筴鱼
季节
叉长
营养级
Trachurus japonicus
season
fork length
trophic level.
