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首页> 外文期刊>Estuarine Coastal and Shelf Science >Salinity effects on the first larval stage of the invasive crab Hemigrapsus takanoi: Survival and swimming patterns
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Salinity effects on the first larval stage of the invasive crab Hemigrapsus takanoi: Survival and swimming patterns

机译：盐度对侵袭性蟹Hemigrapsus Takanoi的第一个幼虫阶段的影响：生存和游泳模式

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摘要

The Asian brush-clawed shore crab Hemigrapsus takanoi has high tolerance for environmental changes facilitated the establishment of non-native populations along the Atlantic European coast. The self-maintenance and potential spread of this invasive crab will partially depend on its ability to disperse during the larval period. Larvae are not equipped with efficient osmoregulatory mechanisms to tolerate low salinity conditions; therefore, they evolved specific swimming behavior that facilitates exportation offshore for development in more stable and higher salinity conditions. To study the salinity tolerance, we quantified the survival of newly hatched larvae subjected to salinities ranging from 2 to 35 over a 24 h period. We observed that more than 50% of larvae could survive 24 h only at salinities higher than 20, and that shorter incubation periods of 2-6 h could produce high mortality at salinities lower than 10. We used video-tracking techniques to quantify swimming in newly hatched larvae at different levels of salinity, and under starvation or food availability conditions. The results showed that apparent swimming speed increases as salinity increases, and that upward trajectories are faster than downward ones. When food was available, the larvae reduced the frequency of helical swimming trajectories, turned out to be faster, straighter and more vertical. At salinities lower than 20, the swimming trajectories became more random, and the described patterns tended to disappear. Our results indicate that lower survival and reduced swimming performance may constrain the dispersal capacity of the non-native populations located at low salinity habitats.
机译：亚洲刷夹的岸蟹蟹Heavapsus Takanoi对环境变化的高耐受性有助于建立沿着大西洋欧洲海岸的非原生人群。这种侵入性螃蟹的自我维护和潜在传播将部分取决于其在幼虫期间分散的能力。幼虫不能配备有效的Osmoregulatory机制，以耐受低盐度条件;因此，他们进化了特定的游泳行为，便于在更稳定和更高的盐度条件下开发出口的出口。为了研究盐度耐受性，我们量化了新孵化的幼虫的存活率在24小时内超过2-35的盐度。我们观察到，超过50％的幼虫可以在高于20的盐度下存活24小时，并且较短的孵化期可以在低于10的盐度下产生高死亡率。我们使用视频跟踪技术来量化游泳在不同水平的盐度和饥饿或食物可用性条件下新孵化的幼虫。结果表明，表观游泳速度随着盐度的增加而增加，并且向上轨迹比向下的轨迹更快。当食物可用时，幼虫会降低螺旋游泳轨迹的频率，结果更快，更直，更垂直。在低于20的盐度下，游泳轨迹变得更随机，所描述的图案往往消失。我们的结果表明，较低的生存和减少的游泳业绩可能会限制位于低盐度栖息地的非原生人群的分散能力。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第30期|106976.1-106976.7|共7页
  • 作者

    Landeira Jose M.; Liu Baobo; Omura Takuo; Akiba Tatsuro; Tanaka Yuji;

  • 作者单位

    Univ Las Palmas Gran Canaria Inst Oceanog & Cambio Global IOCAG Parque Cient Tecnol Marino de Taliarte S-N Telde 35214 Canary Islands Spain|Tokyo Univ Marine Sci & Technol Minato Ku 4-5-7 Konan Tokyo 1088477 Japan;

    Tokyo Univ Marine Sci & Technol Minato Ku 4-5-7 Konan Tokyo 1088477 Japan;

    Tokyo Univ Marine Sci & Technol Minato Ku 4-5-7 Konan Tokyo 1088477 Japan|Lab Aquat Sci Consultant Co LTD Ota Ku 2-30-17 Higashikamata Tokyo 1440031 Japan;

    Natl Inst Adv Ind Sci & Technol 1-1-1 Higashi Tsukuba Ibaraki 3058562 Japan;

    Tokyo Univ Marine Sci & Technol Minato Ku 4-5-7 Konan Tokyo 1088477 Japan;

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  • 正文语种 eng
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  • 关键词

    Zoea; Dispersal; Salinity; Behavior; Invasive species;

    机译：Zoea;分散;盐度;行为;侵入性物种;

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