Gladius is an accepted hard tissue for determining the age,size-specific growth,and trophic dynamics of pelagic squid.However,little is known about the inter-and intra-stock variability of gladius growth pattern and i...Gladius is an accepted hard tissue for determining the age,size-specific growth,and trophic dynamics of pelagic squid.However,little is known about the inter-and intra-stock variability of gladius growth pattern and increment deposition.In this study,the gladius growth patterns with somatic growth and gonad development were evaluated for two geographic stocks of the jumbo squid(Dosidicus gigas)in the tropical Pacific Ocean.The microstructure and periodicity of the gladius growth increments were also investigated.Results showed varied correlations between four gladius morphometric characteristics with dorsal mantle length,while growth in body weight almost followed a power model.Sexual gladius growth patterns occurred with gonad development,possibly due to different biological functions of these gladius parts and sex-specific energetic allocations.Gladius increments were observed formation in the stem and lateral plate and could be consistently enumerated.The daily periodicity of increment deposition,at least over 144 days old,was validated by comparing gladius increments with the ages obtained from the statoliths.The different oceanographic conditions between two areas likely influence the gladius growth and increment deposition and promote higher increment counts in squid from equatorial waters.Above all,these results provided new information on gladius microstructures and growth increment in different stocks of D.gigas and confirmed the use of this tissue for size-specific growth and age determination.展开更多
为探究西北印度洋鸢乌贼(Sthenoteuthis oualaniensis)内壳的形态特性,利用2019年9—11月中国灯光罩网作业在西北印度洋海域采集的594尾鸢乌贼样本,通过内壳结构研究生长特性及不同性别间生长差异。主成分分析表明,内壳长(gladius lengt...为探究西北印度洋鸢乌贼(Sthenoteuthis oualaniensis)内壳的形态特性,利用2019年9—11月中国灯光罩网作业在西北印度洋海域采集的594尾鸢乌贼样本,通过内壳结构研究生长特性及不同性别间生长差异。主成分分析表明,内壳长(gladius length,GL)、翼长(vanes length,VL)、尾锥长(cones length,CL)、尾锥宽(greatest width of cones,GWC)和叶轴最大宽度(greatest width of proostracum,GWP)可作为描述西北印度洋鸢乌贼内壳外形变化的特征参数。协方差分析表明,除VL外所有特征参数与胴长(mantel length,ML)的生长关系均存在性别间显著性差异;所有特征参数与体重(body weight,BW)的生长关系也均存在性别间显著性差异。根据方程拟合与AIC(Akaike s Information Criterion)比较,内壳的参数与胴长和体重均具有显著相关性,可以用线性函数、幂函数、对数函数等表示。由于内壳参数测量相对于胴长测量误差小更准确,因此内壳参数可用于鸢乌贼生物学特性的研究。对比不同头足类内壳结构与胴体的函数关系的差异,可用内壳参数作为种群划分的参考,也为利用内壳结构研究鸢乌贼渔业生物学及资源评估提供了参考依据。展开更多
基金This work was supported by National Natural Science Foundation of China(41541042)National Natural Science Foundation of Shanghai(17ZR1413000)Shanghai Leading Academic Discipline Project(Fisheries Discipline)and Laboratory for Marine Fisheries Science and Food Production Processes,Qingdao National Laboratory for Marine Science and Technology(2017-1A03).
文摘Gladius is an accepted hard tissue for determining the age,size-specific growth,and trophic dynamics of pelagic squid.However,little is known about the inter-and intra-stock variability of gladius growth pattern and increment deposition.In this study,the gladius growth patterns with somatic growth and gonad development were evaluated for two geographic stocks of the jumbo squid(Dosidicus gigas)in the tropical Pacific Ocean.The microstructure and periodicity of the gladius growth increments were also investigated.Results showed varied correlations between four gladius morphometric characteristics with dorsal mantle length,while growth in body weight almost followed a power model.Sexual gladius growth patterns occurred with gonad development,possibly due to different biological functions of these gladius parts and sex-specific energetic allocations.Gladius increments were observed formation in the stem and lateral plate and could be consistently enumerated.The daily periodicity of increment deposition,at least over 144 days old,was validated by comparing gladius increments with the ages obtained from the statoliths.The different oceanographic conditions between two areas likely influence the gladius growth and increment deposition and promote higher increment counts in squid from equatorial waters.Above all,these results provided new information on gladius microstructures and growth increment in different stocks of D.gigas and confirmed the use of this tissue for size-specific growth and age determination.
文摘为探究西北印度洋鸢乌贼(Sthenoteuthis oualaniensis)内壳的形态特性,利用2019年9—11月中国灯光罩网作业在西北印度洋海域采集的594尾鸢乌贼样本,通过内壳结构研究生长特性及不同性别间生长差异。主成分分析表明,内壳长(gladius length,GL)、翼长(vanes length,VL)、尾锥长(cones length,CL)、尾锥宽(greatest width of cones,GWC)和叶轴最大宽度(greatest width of proostracum,GWP)可作为描述西北印度洋鸢乌贼内壳外形变化的特征参数。协方差分析表明,除VL外所有特征参数与胴长(mantel length,ML)的生长关系均存在性别间显著性差异;所有特征参数与体重(body weight,BW)的生长关系也均存在性别间显著性差异。根据方程拟合与AIC(Akaike s Information Criterion)比较,内壳的参数与胴长和体重均具有显著相关性,可以用线性函数、幂函数、对数函数等表示。由于内壳参数测量相对于胴长测量误差小更准确,因此内壳参数可用于鸢乌贼生物学特性的研究。对比不同头足类内壳结构与胴体的函数关系的差异,可用内壳参数作为种群划分的参考,也为利用内壳结构研究鸢乌贼渔业生物学及资源评估提供了参考依据。
