中国水产科学Issue(3)：581-592,12.DOI:10.3724/SP.J.1118.2014.00581
西南大西洋拉氏南美南极鱼耳石形态的多样性
Morphological diversity of sagittae of Patagonotothen ramsayi in the southwestern Atlantic Ocean
摘要
Abstract
We evaluated the sagittae morphology of Patagonotothen ramsayi (Regan 1913) collected from the Southwest-ern Atlantic Ocean in 2011. The sagittae of P. ramsayi were classified into six types based on differences in the Otolith Posterior, Excisural Notch, Antirostrum, and Radiate Stripes. There was a significant difference (up to 36.4%) in the coef-ficients between two of the six types (P<0.05:one-way ANOVA based on 77 coefficients derived from the elliptical Fou-rier). Our analysis combining quantitative and qualitative approaches indicated that:(1) it is feasible to classify the sagittae types based on morphological characters;(2) it is more accurate to describe the diversity of sagittae types and morphologi-cal characters using a combination of quantitative and qualitative approaches;(3) the elliptical Fourier analysis has a high degree of use in the study of P. ramsayi sagittae. The contours reconstructed by the elliptical Fourier analysis distinctly reflected the differences among the six sagittae types. The percentage of different sagittae types changed with the fish length and sagittae length, and there were about 20.2%fishes whose left sagittae and right sagittae were belong to different types. Type Ⅳ sagittae were only observed in small fish showed that, in the larval stages of P. ramsayi the sagittae always be oval and it gradually changed into a fusiform shape with growth. There were always many sagittae types no matter in which body length groups, suggesting that the diversity of sagittae morphology is retained at every developmental stage of P. ramsayi. Based on our results, future studies of P. ramsayi sagittae should make a comprehensive evaluation of the vari-ety of types and take into account the differences between the left and right sagittae.关键词
拉氏南美南极鱼/耳石/形态/多样性/形状指标/椭圆傅里叶分析Key words
Patagonotothen ramsayi/sagittae/morphology/diversity/shape indices/the elliptical Fourier analysis分类
农业科技引用本文复制引用
张凤侠,刘岩,张秀梅..西南大西洋拉氏南美南极鱼耳石形态的多样性[J].中国水产科学,2014,(3):581-592,12.基金项目
农业部西南大西洋公海变水层拖网探捕项目(2130135) （2130135）
