摘要
为掌握不同水层的环境因子对长鳍金枪鱼(Thunnus alalunga)延绳钓渔获率的影响,根据2015-2017年中国大陆在该海域的长鳍金枪鱼延绳钓渔捞日志资料,结合同期海洋环境数据,采用广义可加模型(Generalized additive model,GAM)对渔获率与各因子的关系进行研究。通过相关分析获取各环境因子相关系数,对相关性较大的环境因子分组建模。结果表明:1)海表面温度与120 m水深温度、海表面温度与海表面高度、120 m水深温度与海表面高度、300 m水深温度与300 m水深盐度为高度相关因子,海表面盐度、叶绿素a浓度、海表风场南北分量与其他环境因子之间的相关性均较小;2)模型的总解释偏差介于30%~40%,各环境因子重要性依次为120 m水深温度、海表温度、300 m水深温度、120 m水深盐度、海表面高度、300 m水深盐度、海表盐度、混合层深度、海面风场南北分量、海面风场东西分量、叶绿素a浓度;3)120 m水深温度与单位捕捞努力渔获量(CPUE)在15~30℃呈负相关。海表温度整体趋势与120 m水深温度类似,其中在25~28℃呈正相关。300 m水深温度与CPUE在10~18℃呈现明显的正效应关系。
Based on the data of albacore logbook(Thunnus alalunga)collected by China's Mainland from 2015–2017 in the South Pacific and the marine environmental data in the same period,we analyzed the relationship between catch rate and environmental factors,so as to examine the effects of environmental factors at different depths on T.alalunga by establishing a GAM(Generalized additive model).In addition,we had obtained the correlation coefficient of each environmental factor(those with large correlation were grouped and modeled)by correlation analysis.The results show that:1)Sea surface temperature and sea temperature at depth of120 m,sea surface temperature and sea surface height,sea temperature at depth of 120 m and sea surface height,sea temperature and sea salinity at depth of 300 m were highly correlated factors.However,sea surface salinity,chlorophyll a concentration and northward sea surface wind had no significant correlation with the other environmental factors.2)The explained cumulative deviance was7030%–40%;the environmental factors sorted by importance are as follows:sea temperature at depth of 120 m,sea surface temperature,sea temperature at depth of 300 m,sea salinity at depth of 120 m,sea surface height,sea salinity at depth of 300 m,sea surface salinity,mixed layer depth,northward sea surface wind,eastward sea surface wind and chlorophyll a concentration.3)The sea temperature at depth of 120 m was negatively correlated with CPUE(Catch per unit effort)at 15–30℃.The trend of sea surface temperature was similar to the sea temperature at depth of 120 m,with a positive correlation at 25–28℃.The sea temperature at depth of300 m and CPUE showed a significant positive relationship at 10–18℃.
作者
张嘉容
杨晓明
戴小杰
邹莉瑾
ZHANG Jiarong;YANG Xiaoming;DAI Xiaojie;ZOU Lijin(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Collaborative Innovation Center for Distant-Water Fisheries/National Engineering Research Center for Oceanic Fisheries/Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai 201306,China)
出处
《南方水产科学》
CAS
CSCD
北大核心
2020年第1期69-77,共9页
South China Fisheries Science
基金
国家自然科学基金项目(41506151)
