摘要
海洋初级生产力决定海洋渔业资源的潜在产量,我国应用海洋初级生产力方法估算渔业资源量亦已取得不少研究成果,但海洋生态系统中的营养控制机制复杂多样,将影响海洋初级生产力与鱼类资源量的关系。本文利用中国大型灯光围网渔业在东海南部渔场的鲐鱼(Scomber japonicus)捕捞数据与海洋净初级生产力的遥感资料分析了鲐鱼资源量变化与净初级生产力的关系,探讨了其生态系统营养控制机制。研究结果表明,净初级生产力与标准化CPUE(Catch Per Unit Effort)不存在显著的线性关系(P>0.05),但呈显著非线性关系(P<0.05),且这种非线性关系表现为倒抛物线,即鲐鱼资源量随净初级生产力的增加而提高,但当净初级生产力进一步增加,鲐鱼资源量则呈下降趋势。净初级生产力与标准化CPUE呈显著的倒抛物线关系表明生态系统存在上行控制机制,但并非受该机制完全控制。种间竞争或浮游动物资源量的变动均可能引起鲐鱼资源的相对丰度与净初级生产力呈倒抛物线关系。
The potential fish production was controlled largely by ocean primary production（OPP）and there were a lot of research findings of estimating fish production by using OPP in China.The relationships between the biomass of fishery stock and OPP were often complicated by the varieties of trophic control in the ecosystem.In this paper,we examined the relationship between biomass of chub mackerel（Scomber japonicus）and net primary production（NPP）and discussed mechanism of trophic control in the ecosystem of chub mackerel fishing ground in southern East China Sea by using catch and effort data from the Chinese mainland large light-purse seine fishery and NPP derived from remote sensing.The results showed there was a significant non-linear relationship between NPP and standardized CPUE（Catch Per Unit Effort）（P〈0.05）instead of the linear trend.The non-linear relationship could be described by a reversed parabolic curve,which meant the biomass of chub mackerel increased with NPP and then decreased when the NPP exceeded a point.The results implied there were other trophic controls in addition to bottom-up control occurred in the ecosystem in southern East China Sea.We speculated the change of abundance of the key species at intermediate trophic levels and/or interspecific competitions contribute to the relationship.
出处
《海洋学报》
CAS
CSCD
北大核心
2013年第5期121-127,共7页
基金
国家发改委产业化专项(2159999)
上海市科技创新行动计划(12231203900)
海洋高分辨率卫星遥感系统研制与示范应用项目资助
关键词
东海南部
净初级生产力
鲐鱼
资源量
southern East China Sea
net primary production
Scomber japonicus
biomass
