东海火枪乌贼角质颚的形态特征 [中文引用][英文引用]

根据2010年9月及2011年5月东海渔业资源底拖网调查资料, 测定了火枪乌贼(Loligo beka)的胴长、角质颚形态指标等参数, 阐述了火枪乌贼角质颚的形态特征及其长度的相对稳定性指标。结果表明, 火枪乌贼角质颚的喙长(RL)、头盖长(HL)、脊突长(CL)、翼长(WL)、翼宽(WW)等长度上、下颚差异较大, 其中, 上、下颚HL相对于RL均存在着等速生长现象(P > 0.05); CL相对于RL均存在着显著的异速生长现象(P < 0.05); 而WL、WW相对于RL则呈现极显著的异速生长现象(P < 0.001)。上、下颚各长度指标均受生长的影响, 均随胴长的增长呈极显著的线性增长趋势。RL/HL、RL/CL、HL/CL的比值非常稳定, 不随胴长、体质量的变化而显著变化, 可作为火枪乌贼角质颚形态特征的稳定性指标。

Using data collected from the bottom trawl surveys conducted in the East China Sea during September 2010 and May 2011, this paper presents beak morphology of Loligo beka found in this region, and analyzes the relative stability of indices related to beak length, mantle length, and relative growth. Length measurements obtained for the upper beak, including the rostrum length (RL), hood length (HL), crest length (CL), wing length (WL), and wing width (WW) showed a higher variability than those corresponding to the lower beak. Hood growth in relation to that of the rostrum was isometric, while growth rates relative to the crest and the wing were allometric. Beak length indices were clearly affected by individual growth patterns. Beak length indices increased linearly with the mantle length. However, the ratios of RL/HL, RL/CL, HL/CL remained very stable, and did not alter observably with changes in mantle length or body weight. These ratios could be used as stable beak indices of the morphological characteristics of Loligo beka.