The Distribution and Ecology of Ariosoma Balearicum (Congridae) Leptocephali in the Western North Atlantic
The Distribution and Ecology of Ariosoma Balearicum (Congridae) Leptocephali in the Western North Atlantic
复制标题
北大西洋西部的 Ariosoma Balearicum (Congridae) Leptocephali 的分布和生态
DOI：
10.1023/a:1014311429809
复制
发表时间：
2002
影响因子：
1.4
通讯作者：
Michael J. Miller
中科院分区：
文献类型：
--
作者：
Michael J. Miller
对西北大西洋17个航次的4589条斑鳗鲡细头蚴进行了调查。对其中915个进行的肌节计数表明，肌节的数量有两个范围，似乎与单独的产卵种群有关。2月至4月，马尾藻海中的较高范围（高计数：128-137）的长度始终为70-100 mm，9月至10月，北方马尾藻海和墨西哥湾流中的长度为20-80 mm。那些低范围（低计数：120-130）是罕见的北方和东部的马尾藻海，他们一直比高计数leptocephali更大的长度和最丰富的佛罗里达电流和普罗维登斯海峡。的地理分布的大小和肌节范围的水文提供了强有力的支持的假设，即高计数鳗鱼发现沿着南大西洋湾（SAB）迁移跨越佛罗里达电流产卵在西北马尾藻海。这种迁移模式类似于Anguilla rostrata和Conger oceanicus，它们使用南部的马尾藻海作为幼虫发育。然而，分布的高计数leptocephali表明，他们使用整个马尾藻海环流作为一个发展领域的幼虫之前，穿越佛罗里达电流和招聘的SAB。居住在巴哈马群岛的低计数鳗鱼似乎在银行附近产卵，它们在普罗维登斯海峡和马尾藻海西南部的丰富数量表明，大多数鳗鱼都保留在巴哈马群岛附近。这两种不同的风格的产卵，分布和招聘的幼虫被假设为有关的两个少年栖息地和由此产生的限制生长和招聘的幼虫的不同水文制度。从其他地区报告的脊椎和肌节计数表明，在北大西洋的其他地区有不同的人群。
A total of 4589 leptocephali of the congrid eel,Ariosoma balearicum, were examined from 17 cruises in the western North Atlantic Ocean. Myomere counts made on 915 of these indicated there were two ranges of number of myomeres that appear to be associated with separate spawning populations. Those with the higher range (high count: 128–137) were consistently 70–100 mm in length in the Sargasso Sea from February to April and 20–80 mm in length in the northern Sargasso Sea and Gulf Stream from September to October. Those with the lower range (low count: 120–130) were rare in the northern and eastern Sargasso Sea where they had consistently greater lengths than high count leptocephali and were most abundant in the Florida Current and Providence Channel. The geographic distributions of size and myomere ranges in relation to hydrography provide strong support for the hypothesis that high count eels found along the South Atlantic Bight (SAB) migrate across the Florida Current to spawn in the northwest Sargasso Sea. This migratory pattern is similar to those ofAnguilla rostrataandConger oceanicus, which use the southern Sargasso Sea for development as larvae. However, the distribution of high count leptocephali suggests that they use the entire Sargasso Sea gyre as a development area as larvae before crossing the Florida Current and recruiting to the SAB. The low count eels inhabiting the Bahamas appear to spawn near the banks and their abundance in the Providence Channel and southwest Sargasso Sea suggests most are retained close to the Bahamas. These two distinct styles of spawning, distribution and recruitment of larvae are hypothesized to be related to the different hydrographic regimes of the two juvenile habitats and the resulting constraints on growth and recruitment of larvae. Vertebral and myomere counts reported from other areas suggest there are distinct populations in other regions of the North Atlantic Ocean.