青岛近岸水域春、秋季鱼类群落结构

根据2004年春、秋季渔业资源底拖网调查数据,应用单元和多元统计方法分析了青岛近岸水域春、秋季鱼类群落结构。春、秋季调查分别渔获31、32种鱼类,平均每网渔获量分别为7.36kg/h和2.99kg/h,优势种类主要包括赤鼻棱鳀Thrissa chefuensis、大泷六线鱼Hexagrammo sotakii、方氏云鳚Enedrias fangi、黄鳍刺鰕虎鱼Acanthogobius flavimanus、细纹狮子鱼Liparis tanakai和长条蛇鲻Saurida elongata等。聚类分析表明,春、秋季青岛近岸水域鱼类群落都可划分为3个站位组,分别对应于北部、中部和南部调查水域。不同站位组的优势种组成变化较大,不同站位组间种类组成差异显著。分析了造成站位组内种类组成相似的特征种和造成不同站位组间相异的分歧种。不同站位组的特征种不同。赤鼻棱鳀、大泷六线鱼、黄鳍刺鰕虎鱼、方氏云鳚、星康吉鳗Conger myriaster、角木叶鲽Pleuronichthys cornutus和细纹狮子鱼是春季所有站位组间的分歧种;赤鼻棱鳀、白姑鱼Argyrosomus argentatus、大泷六线鱼、带鱼Trichiurus lepturus、短吻红舌鳎Cynoglossus joyneri、方氏云鳚、细条天竺鱼Apogonichthys lineatus、小黄鱼Pseudosciaena polyactis和矛尾鰕虎鱼Chaeturichthys stigmatias是秋季所有站位组间的分歧种。大多数特征种也是不同站位组间的分歧种,主要是由于这些种类的数量分布的空间变化造成的。青岛沿海鱼类群落结构存在明显的时空异质性。

Fish community structure in the coastal waters off Qingdao in spring and autumn

Based on the data collected from the bottom otter trawl surveys in the coastal waters off Qingdao in spring and autumn 2004, the fish community structure was analyzed using univariate and multivariate methods. The results showed that 31 and 32 fish species were caught in spring and autumn surveys, respectively. The mean catches per haul were at 7.36 kg/h in spring and 2.99 kg/h in autumn. The dominant species mainly consisted of chefoo thryssa Thrissa chefuensis, fat greenling Hexagrammos otakii, blenny Enedrias fangi, yellowfin goby Acanthogobius flavimanus, snailfish Liparis tanakai and shortfin lizardfish Saurida elongata etc. Three station groups were identified for both spring and autumn, being located at the northern, central and southern part of the survey waters, respectively. The dominant species varied in different station groups in spring and autumn. There were significant differences in species compositions among different station groups. The typifying species within station groups and discriminating species most responsible for the dissimilarity between station groups were examined. The typifying species varied between station groups in spring and autumn. In spring, chefoo thryssa, fat greenling, yellowfin goby, blenny, whitespotted conger Conger myriaster, frog flounder Pleuronichthys cornutus and snailfish were discriminators for all between-groups. In autumn, chefoo thryssa, white croaker Argyrosomus argentatus, shortfin lizardfish, fat greenling, hairtail Trichiurus lepturus, red tongue sole Cynoglossus joyneri, blenny, cardinal fish Apogonichthys lineatus, small yellow croaker Pseudosciaena polyactis and finespot goby Chaeturichthys stigmatias were most responsible for the dissimilarities for all between-groups. Most typifying species also acted as the discriminator between station groups, which was mainly caused by the spatial changes in the abundance of these species. There existed distinct spatiotemporal heterogeneity for the fish community structure in the coastal waters off Qingdao.