摘要
茎柔鱼是具有高度洄游性的中上层头足类,是生态系统中的关键物种,也是我国远洋渔业重要捕捞对象之一.了解掌握茎柔鱼摄食及洄游信息有助于对其资源进行更合理利用.头足类内壳是一良好的信息载体,其生长发育具有不可逆性且生长贯穿整个生活史过程,包含了头足类生活史过程中的全部信息.本研究通过对秘鲁外海茎柔鱼耳石日龄进行鉴定,建立其内壳叶轴生长方程,根据该生长方程对内壳叶轴进行连续切割,测定其碳、氮稳定同位素比值,并初步分析了其在生长发育过程中的食性转换和洄游习性.结果表明:茎柔鱼个体在出生180 d后开始洄游活动,且营养层次存在下降趋势.证明了内壳连续取样分析茎柔鱼个体摄食习性和栖息地变化的可行性.
As a pelagic cephalopod and one of the main target species of Chinese distant water fishery,jumbo squids( Dosidicus gigas) play a major role in the marine ecosystems of the eastern Pacific. Understanding the feeding ecology and migration patterns of jumbo squids is of importance for better utilizing the resources. The isotopic signatures of gladius have been proved to be a powerful tool to reveal high resolution and ontogenic variations in individual foraging strategies of squids,which is an archival tissue with no elemental turnover after formation. In this study,the growth equation of gladius proostracum was established based on the age information determined by statolith. Gladius was cut successionally by the growth curve of gladius proostracum,the stable isotopic values of the gladius profiles were determined,and the feeding ecology and migration patterns of jumbo squids during its growth process were investigated. Results showed that the jumbo squids began to migrate after 180 days of postnatal,and their trophic levels tended to decrease throughout the life span. These results demonstrated the feasibility of using continuous sampling hard tissue to study the feeding ecology and habitat transfer of jumbo squids.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第9期2874-2880,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(41206124)
教育部博士点基金项目(20123104120001)
上海大学生创新活动计划项目(31015201330)资助
关键词
稳定同位素
内壳
茎柔鱼
洄游路径
食性
stable isotopes
gladius
jumbo squid
migration patterns
feeding habits