• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advances in limnology >Seasonal distribution of omul (Coregonus autumnalis migratorius (Georgi)) in Lake Baikal: implications for acoustics assessment
【24h】

Seasonal distribution of omul (Coregonus autumnalis migratorius (Georgi)) in Lake Baikal: implications for acoustics assessment

机译：贝加尔湖Omul（Coregonus autumnalis migratorius（Georgi））的季节性分布：对声学评估的影响

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

We describe the seasonal distribution of omul (Coregonus autumnalis migratorius) in Lake Baikal using data from gill net, bottom trawl and acoustic surveys carried out between 1966 and 1998 with special attention to the best timing for future acoustic surveys. Omul distribution varies with season and among eco-inorphotypes (coastal, pelagic, and deep-water). The winter distribution is characterized by concentrations of all three morphotypes in the slope zone in 100-350 in deep water, scattered fish in the lower layers of the epi-pelagic zone, and a complete absence of omul from the surface to 50 m depth in both the nearshore and offshore regions. In the summer and autumn, pelagic omul occupy the top 50 m of both offshore and nearshore regions including bays. At this time, the deep-water omul is found close to the bottom in depths of 125-175 m. During the early spring transition period, pelagic omul reside in 50-150 m depth and deep-water omul in 250-350 m depth. At this time, the omul morphotypes are separated spatially and pelagic omul do not overlap with other species present in the upper 50 m. This transition period (typically from end of May to the beginning of June) is therefore the best time for acoustic surveys of omul in Lake Baikal.
机译：我们使用g网，底拖网和声学调查（于1966年至1998年之间）进行的数据描述贝加尔湖Omul（Coregonus autumnalis migratorius）的季节性分布，并特别注意未来声学调查的最佳时机。 mul鼠的分布随季节和生态型（沿海，中上层和深水）而变化。冬季分布的特征是深水在100-350的斜坡带中所有三种形态型的浓度，上层上层带下层的零散鱼，以及从表层到50 m深度完全没有o石。无论是近岸还是近海地区。在夏季和秋季，浮游性mul石占据了包括海湾在内的近海和近海区域的前50 m。此时，发现深水mul石靠近底部，深度为125-175 m。在春季过渡期初期，中上层牡蛎栖息在50-150 m深度，深水牡蛎栖息在250-350 m深度。这时，o豆的形态型在空间上是分离的，远洋o豆不与上部50 m中存在的其他物种重叠。因此，这个过渡时期（通常是从5月底到6月初）是贝加尔湖欧穆尔声学测量的最佳时间。

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