...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Biological invasions >Rapid dispersal and establishment of a benthic Ponto-Caspian goby in Lake Erie: diel vertical migration of early juvenile round goby
【24h】

Rapid dispersal and establishment of a benthic Ponto-Caspian goby in Lake Erie: diel vertical migration of early juvenile round goby

机译：快速扩散并在伊利湖中建立底栖的蓬图里海虾虎鱼：早期幼轮虾虎鱼的垂直垂直迁移

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The round goby, Apollonia melanostoma, a molluscivore specialist, was introduced to the Great Lakes in the early 1990s and rapidly expanded its distribution, especially in Lake Erie. Adult round goby morphology suggests low dispersal and migration potential due to the lack of a swim bladder and benthic life style. Given that the larval stage occurs inside the benthic egg, and juveniles have adult morphologies, it has been suspected that dispersal and invasion potential is low for early life stages also. However, we identified early juvenile round gobies in the nocturnal pelagic in Lake Erie and thus we conducted a sampling study to determine the extent to which this life stage uses the nocturnal pelagic. Replicate ichthyoplankton samples were collected at 3-h intervals (1900-0700 h) at three depths (2 m, 5 m, 8 m) in western Lake Erie (water depth = 10 m) in July and August 2002 and June 2006. Early juvenile round gobies (6-23 mm TL) were present almost exclusively in the nocturnal samples (2200 h, 0100 h, 0400 h) with peak densities approaching 60 individuals per 100 m(3) of water sampled. Nocturnal density was also significantly greater at 8-m depth versus 2-m and only the smallest fish (6-8 mm TL) migrated to the surface (2-m). Analyses of diet clearly demonstrated that these fish are foraging on plankton at night and thus may not be light limited for foraging in ship ballast tanks. In ships that take on thousands of tonnes of water for ballast, nocturnal ballasting could easily result in transport of thousands of young round gobies at a time. Additionally, within-lake dispersal at this lifestage is likely common and may facilitate downstream passage across barriers designed to limit range expansion.
机译：圆环虾虎鱼，软体动物专家，Apollonia melanostoma，于1990年代初被引入大湖，并迅速扩大了其分布，特别是在伊利湖。由于缺乏游泳膀胱和底栖生物，成年圆形虾虎鱼形态表明低散布和迁移潜力。由于幼虫阶段发生在底栖卵内，并且幼虫具有成年形态，因此怀疑在早期生命阶段的扩散和入侵潜力也很低。但是，我们在伊利湖的夜间中上层海域中发现了早期的轮状虾虎鱼，因此我们进行了抽样研究，以确定这一生命阶段使用夜间中上层海藻的程度。在2002年7月，8月和2006年6月，在伊利湖西部（水深= 10 m）三个深度（2 m，5 m，8 m）以3小时为间隔（1900-0700 h）收集了浮游鱼类的复制样本。夜间样本（2200 h，0100 h，0400 h）中几乎只存在幼小圆形虎虾（6-23毫米TL），每100 m（3）的水的峰值密度接近60个人。夜间密度在8米深处比2米显着更大，只有最小的鱼（6-8毫米TL）迁移到水面（2米）。饮食分析清楚地表明，这些鱼在夜间以浮游生物觅食，因此在船压载舱中觅食可能不受光的限制。在需要数千吨水作为压载水的船舶中，夜间压载很容易导致一次运输成千上万只年轻的圆形虾虎鱼。另外，在此生命周期内湖内扩散很可能很普遍，并且可能促进下游通过旨在限制范围扩展的屏障。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号