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首页> 外文期刊>Marine biology >Residency patterns and movements of grey reef sharks (Carcharhinus amblyrhynchos) in semi-isolated coral reef habitats
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Residency patterns and movements of grey reef sharks (Carcharhinus amblyrhynchos) in semi-isolated coral reef habitats

机译：半隔离珊瑚礁生境中灰礁鲨（Carcharhinus amblyrhynchos）的居住模式和活动

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The degree of reef isolation may limit the frequency of long-range dispersals in reef-associated sharks. Therefore, understanding how the behaviour and spatial ecology of a species differs across reef habitats is essential for developing sound conservation approaches. The present study examined the residency, movement and activity space of grey reef sharks (Carcharhinus amblyrhynchos) in the central Great Barrier Reef (GBR). An array of 56 acoustic receivers covering 17 semi-isolated coral reefs across 150 km was used to monitor shark movements. Forty C. amblyrhynchos were tagged with acoustic transmitters and monitored from 251 to 821 days. Most sharks were detected on a single reef; however, some individuals (4 females; 10 males) moved to up to five reefs. Residency index ranged from 0.02 to 1.0, with a mean ± SD of 0.78 ± 0.26. Mixed-effect models showed that weekly and monthly residency was mainly influenced by shark size, with little or no effect of environmental parameters. Although C. amblyrhynchos were present year-round, juvenile sharks had lower residency to their tagging reef than adults. In addition, mature females were detected less between November and mid-February, which coincides with reported parturition in the central GBR. Long-term monitoring data revealed that C. amblyrhynchos exhibited high residency to their tagging reef, and therefore, even in systems with semi-isolated reefs such as the GBR, this species may benefit from spatial management approaches at the reef level. However, behavioural differences between sexes and life-stages of C. amblyrhynchos reported in this study suggest marine reserves may provide lower protection relative to more remote and isolated coral reefs.
机译：珊瑚礁隔离程度可能会限制与珊瑚礁相关的鲨鱼的远程扩散频率。因此，了解物种的行为和空间生态在不同的珊瑚礁生境中如何不同对于开发合理的养护方法至关重要。本研究调查了大堡礁（GBR）中部的灰礁鲨（Carcharhinus amblyrhynchos）的居住，活动和活动空间。一组56个声学接收器组成的阵列覆盖了150公里的17个半隔离的珊瑚礁，用于监测鲨鱼的运动。用声发射器给四十个C. amblyrhynchos贴上标签，并在251天到821天之间进行监测。大多数鲨鱼是在单个礁石上发现的；但是，有些人（4名女性； 10名男性）搬到了五个礁石上。居住指数范围为0.02至1.0，平均值±SD为0.78±0.26。混合效应模型表明，每周和每月的居住地主要受鲨鱼大小的影响，几乎没有或没有环境参数的影响。尽管整整一年的鲨鱼都存在，但幼鲨到其标本礁的居留率要比成年鲨鱼低。此外，在11月至2月中旬期间，查出的成年女性较少，这与GBR中部的分娩相吻合。长期监测数据表明，水豚鱼对它们的标签礁显示出很高的居住率，因此，即使在具有半隔离礁的系统（例如GBR）中，该物种也可以从礁水平的空间管理方法中受益。但是，这项研究中报道的按性别成虫的生命行为和生命阶段之间的行为差​​异表明，相对于更偏远和孤立的珊瑚礁，海洋保护区可能提供的保护性较低。

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  • 来源
    《Marine biology》 |2015年第2期|343-358|共16页
  • 作者

    Mario Espinoza; Michelle. R. Heupel; Andrew J. Tobin; Colin A. Simpfendorfer;

  • 作者单位

    Centre for Sustainable Tropical Fisheries and Aquaculture and College of Marine and Environmental Sciences, James Cook University, Townsville, QLD 48113, Australia,AIMS@JCU, Australian Institute of Marine Science, College of Marine and Environmental Sciences, James Cook University, Townsville, QLD 4811, Australia;

    Centre for Sustainable Tropical Fisheries and Aquaculture and College of Marine and Environmental Sciences, James Cook University, Townsville, QLD 48113, Australia,Australian Institute of Marine Science, PMB No 3, Townsville, QLD 4810, Australia;

    Centre for Sustainable Tropical Fisheries and Aquaculture and College of Marine and Environmental Sciences, James Cook University, Townsville, QLD 48113, Australia;

    Centre for Sustainable Tropical Fisheries and Aquaculture and College of Marine and Environmental Sciences, James Cook University, Townsville, QLD 48113, Australia;

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