...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Polar biology >Contrasting the early life histories of sympatric Arctic gadids Boreogadus saida and Arctogadus glacialis in the Canadian Beaufort Sea
【24h】

Contrasting the early life histories of sympatric Arctic gadids Boreogadus saida and Arctogadus glacialis in the Canadian Beaufort Sea

机译：与加拿大波弗特海同胞北极奇异鸟的早期生活史形成对比

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 early life stages of Boreogadus saida and Arctogadus glacialis are morphologically similar, making it difficult to assess differences in their ecological niche. The present study documented for the first time the early life stage ecology of A. glacialis, compared it to that of B. saida, and identified the factors separating the niches of the two sympatric species. The 10,565 larval gadids collected in the Beaufort Sea from April to August of 2004 and 2008 were identified to species either directly by genetics and/or otolith nucleus size, or indirectly with a redistribution procedure. Between 8.0 and 8.7 % of all gadids were assigned to A. glacialis. Larvae of A. glacialis were longer at hatch and experienced lower mortality rates than those of B. saida. The two species shared similar spatiotemporal and vertical distributions, hatching season, and growth rate. Under the ice, feeding incidence of B. saida was low (14 %) relative to A. glacialis (88 %). At lengths < 15 mm, both species specialized on different prey. The diet of fish > 15 mm overlapped (Schoener's index = 0.7), with Calanus glacialis and C. hyperboreus providing > 50 % of the carbon intake of both species. The higher mortality in B. saida may be explained by the smaller size at age from hatching to metamorphosis and a lower under-ice feeding incidence. The early larval stage appears to be the key period of niche divergence between the two species.
机译：Boreogadus saida和Arctogadus glacialis的早期生命在形态上相似，因此很难评估其生态位的差异。本研究首次记录了冰河曲霉（A. glacialis）的早期生命阶段生态学，并将其与所述的B.saida进行了比较，并确定了分离两个同胞物种生态位的因素。 2004年4月至8月以及2008年4月至8月在波弗特海收集的10,565个幼虫gadids通过遗传和/或耳石核大小直接鉴定为物种，或通过重新分配过程间接鉴定为物种。在所有gadid中，有8.0％至8.7％被分配给了A. glacialis。与B. saida相比，A。glacialis的幼虫孵化时间更长，死亡率更低。这两个物种具有相似的时空和垂直分布，孵化季节和生长速率。在冰下，所述B.saida的摄食率相对于A.glacialis（88％）较低（14％）。在长度小于15毫米时，两个物种专门捕食不同的猎物。大于15毫米的鱼的饮食重叠（Schoener指数= 0.7），而Calanus glacialis和C. hyperboreus提供的碳摄入量均超过两种物种的50％。从孵化到变态的年龄越小，以及冰下摄食的发生率越低，可以解释所述B. saida的较高死亡率。幼虫早期似乎是两个物种之间生态位差异的关键时期。

著录项

  • 来源
    《Polar biology》 |2016年第6期|1005-1022|共18页
  • 作者

    Bouchard Caroline; Mollard Salome; Suzuki Keita; Robert Dominique; Fortier Louis;

  • 作者单位

    Univ Laval, Dept Biol, Quebec Ocean, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Biol, Quebec Ocean, Quebec City, PQ G1V 0A6, Canada|Univ Bretagne Occidentale, Labex MER, F-29238 Brest, France;

    Kyoto Univ, Maizuru Fisheries Res Stn, Field Sci Educ & Res Ctr, Maizuru, Kyoto 6250086, Japan;

    Mem Univ Newfoundland, Ctr Fisheries Ecosyst Res, Fisheries & Marine Inst, St John, NF A1C 5R3, Canada;

    Univ Laval, Dept Biol, Quebec Ocean, Quebec City, PQ G1V 0A6, Canada;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hatching season; Distribution; Diet overlap; Growth; Mortality; Resource partitioning;

    机译：孵化季节;分布;饮食重叠;生长;死亡率;资源分配;

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