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首页> 外文期刊>Marine biology >Diel vertical migration of Sagitta setosa as inferred acoustically in the Black Sea
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Diel vertical migration of Sagitta setosa as inferred acoustically in the Black Sea

机译：在黑海中听觉推断出箭手座的Diel垂直迁移

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摘要

Swimming trajectories of chaetognaths Sagitta setosa Mueller in the Black Sea were studied using an echosounder operating at 120 and 200 kHz and an acoustic Doppler current profiler (ADCP) operating at 150 kHz. S. setosa were acoustically discriminated with respect to vertical migration and swimming speed, according to dissolved oxygen (DO) concentration and the timing of migrations. S. setosa formed a concentration layer thicker than Calanus euxinus did (1-3 m). The migration was completed in about 2.5-4 h, upward migration starting before C. euxinus and downward migration after C. euxinus. Adult Sagitta swam fast only in the well-oxygenated layer (subsurface maximum DO). The DO was found to be a significant (p < 0.05) variable by partial correlation between the speed and hydrog-raphical parameters. This feature constituted an oxygen-dependent influence on S. setosa's vertical swimming and distinguished S. setosa from C. euxinus. Chaetognaths migrated daily between the nearsurface and the oxycline or the suboxic zone (OMZ, see Fig. 3b for the layers characterized by DO). Whether the deepest depth limit of migration was the oxycline or the OMZ depended on the relative abundance of adult and immature (young) individuals in the concentration layer. In July and September, individuals belonging to a new generation did not migrate but stayed in subsurface water day and night.
机译：使用在120和200 kHz下运行的echosounder和在150 kHz下运行的声学多普勒电流廓线仪（ADCP），研究了黑海象牙甲（Sagitta setosa Mueller）的游泳轨迹。根据溶解氧（DO）的浓度和迁移时间，在声学上区分了S. setosa的垂直迁移和游泳速度。 Set。setosa形成了一个浓缩层，比Calanus euxinus（1-3 m）厚。迁移在约2.5-4小时内完成，向上迁移开始于euxinus之前，而向下迁移euxinus之后。成年的人马座只在充分充氧的层中游泳（地下最大溶解氧）。通过速度与水动力参数之间的部分相关性，发现溶解氧是一个显着的（p <0.05）变量。此功能对S. setosa的垂直游泳构成了依赖氧气的影响，并与C. euxinus区分了S. setosa。千足虫每天都在近地表与奥克西林或亚氧带之间迁移（OMZ，以DO为特征的层见图3b）。迁移的最深深度极限是奥昔康林还是OMZ，取决于浓度层中成年和未成熟（年轻）个体的相对丰度。在七月和九月，属于新一代的人没有迁移，而是昼夜呆在地下水域中。

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  • 来源
    《Marine biology》 |2006年第3期|p.573-584|共12页
  • 作者

    Erhan Mutlu;

  • 作者单位

    Institute of Marine Sciences, Middle East Technical University, POB 28, Erdemli, 33731 Mersin, Turkey;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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