...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Complex vertical migration of larvae of the ghost shrimp, Nihonotrypaea harmandi, in inner shelf waters of western Kyushu, Japan
【24h】

Complex vertical migration of larvae of the ghost shrimp, Nihonotrypaea harmandi, in inner shelf waters of western Kyushu, Japan

机译：在日本九州西部内陆水域中，鬼虾Nihonotrypaea harmandi的幼体复杂的垂直迁移

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 position of meroplanktonic larvae in the water column with depth-dependent current velocities determines horizontal transport trajectories. For those larvae occurring in inner shelf waters, little is known about how combined diel and tidally-synchronized vertical migration patterns shift ontogenet-ically. The vertical migration of larvae of Nihonotrypaea harmandi (Decapoda: Thalassinidea: Callia-nassidae) was investigated in mesotidal, inner shelf waters of western Kyushu, Japan in July-August 2006. The larval sampling at seven depth layers down to 60 m was conducted every 3 h for 36 h in a 68.5-m deep area 10 km off a major coastal adult habitat. Within a 61-65-m deep area 5-7.5 km off the adult habitat, water temperature, salinity, chlorophyll a concentration, and photon flux density were measured, and water currents there were characterized from harmonic analysis of current meter data collected in 2008. The water column was stratified, with pycnocline, chlorophyll a concentration maximum, and 2% of photon flux density at 2 m, recorded at around 22-24 m. The stratified residual currents were detected in their north component, directed offshore and onshore in the upper and lower mixed layers, respectively. More than 87% of larvae occurred between 20 m and 60 m, producing a net onshore transport of approximately 1.3 km d~(-1). At the sunset flooding tide, all zoeal-stage larvae ascended, which could further promote retention (1.4-km potential onshore transport in 3 h). The actual onshore transport of larvae was detected by observing their occurrence pattern in a shallow embayment area with the adult habitat for 24 h in October 1994. However, ontogenetic differences in the vertical migration pattern in inner shelf waters were also apparent, with the maximum mean positions of zoeae deepening with increasing stages. Zoeae I and II performed a reverse diel migration, with their minimum and maximum depths being reached around noon and midnight, respectively. Zoeae IV and V descended continuously. Zoeae III had behaviors that were intermediate to those of the earlier- and later-stage zoeae. Postlarvae underwent a normal diel migration (nocturnal ascent) regardless of tides, with the deepest position (below 60 m and/or on the bottom) during the day. These findings give a new perspective towards how complex vertical migration patterns in meroplanktonic larvae enable their retention in inner shelf waters before the final entry of postlarvae into their natal populations.
机译：浮游生物幼虫在水柱中的位置取决于深度，其流速取决于水流​​的水平。对于那些在内陆架水域中发生的幼虫，关于狄尔和潮汐同步组合的垂直迁移模式是如何从遗传学上转移的，鲜为人知。 2006年7月至8月，在日本九州西部的中生陆内侧陆架水域中调查了Nihonotrypaea harmandi（Decapoda：Thalassinidea：Callia-nassidae）幼虫的垂直迁移。每隔7层深至60 m的幼虫取样。在距离主要沿海成年栖息地10公里的68.5米深的区域中，进行3 h持续36 h。在距成年栖息地5-7.5公里的61-65米深区域内，测量了水温，盐度，叶绿素a浓度和光子通量密度，并根据2008年收集的电流表数据的谐波分析来表征水流水柱被分层，在2 m处有比可可啉，叶绿素的最大浓度和2％的光子通量密度，记录在22-24 m处。分层残余电流在其北部部分被检测到，分别在上，下混合层中定向到近海和陆上。超过87％的幼虫发生在20 m至60 m之间，产生约1.3 km d〜（-1）的净陆上运输。在日落洪水时，所有生长期的幼虫都上升，这可能进一步促进滞留（3小时内有1.4公里的潜在陆上运输）。 1994年10月，通过观察成虫在浅水区与成年栖息地之间的发生模式，可以检测到其在陆地上的实际陆上运输，持续了24 h。但是，在内层架水体中垂直迁移模式的个体发育差异也很明显，最大平均值zoeae的位置随着阶段的增加而加深。 Zoeae I和II进行了反向diel迁移，分别在中午和午夜达到了最小和最大深度。 Zoeae IV和V连续下降。 Zoeae III的行为介于早期和晚期zoeae的中间。幼虫不论潮汐如何都进行正常的di移动（夜间上升），白天的位置最深（60 m以下和/或在底部）。这些发现提供了一个新的观点，认为在浮游幼虫最终进入后代之前，其复杂的垂直迁移模式如何使它们保留在内层架水中。

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