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首页> 外文期刊>Marine biology >Spatial behaviour and site fidelity of the sicklefin lemon shark Negaprion acutidens in a remote Indian Ocean atoll
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Spatial behaviour and site fidelity of the sicklefin lemon shark Negaprion acutidens in a remote Indian Ocean atoll

机译：镰刀形柠檬鲨Negaprion acutidens在偏远印度洋环礁中的空间行为和部位保真度

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摘要

Understanding the movement behaviour of any species is important for developing species-specific management and conservation measures. In recent years, the sicklefin lemon shark Negaprion acutidens has shown rapid range reductions and has even disappeared altogether in certain areas. In this study, the area use patterns and site fidelity of the N. acutidens were assessed at the St. Joseph Atoll in the Seychelles. Passive acoustic telemetry methods were employed to monitor the movements of 19 tagged individuals for 1 year. Area use within the lagoon of the atoll was found to be highly restricted, with individuals typically utilising a small portion of the available area throughout the year. A high-use zone was apparent in the south-east of the atoll's lagoon, which was shared by many of the monitored individuals. Fidelity to the study site was found to be extremely high, with the 79 % of tagged N. acutidens still present in the atoll at the end of the study. Individuals displayed both diel and tidal movements between the lagoon and surrounding habitats. The restricted area use and high site fidelity observed in this study highlight both the vulnerability of this species to rapid over exploitation and importance of remote habitats such as the St. Joseph Atoll in their future conservation. The results obtained here can be used to inform management decisions regarding the development and utilisation of similar atoll environments throughout the species' range.
机译：了解任何物种的移动行为对于制定针对物种的管理和保护措施都很重要。近年来，镰刀形柠檬鲨Negaprion acutidens的射程迅速缩小，甚至在某些地区完全消失。在这项研究中，在塞舌尔的圣约瑟夫环礁评估了尖顶猪笼草的面积利用方式和保真度。被动声学遥测方法被用来监测19个标记个人的运动情况，为期1年。发现在环礁泻湖内的区域使用受到严格限制，个人通常全年使用可用区域的一小部分。在环礁泻湖的东南部有一个高使用区，许多被监视的人都共享该区。研究地点的保真度极高，在研究结束时环礁中仍存在79％的带标签的念珠菌。个人展示了泻湖与周围栖息地之间的diel和潮汐运动。在这项研究中观察到的限制区域使用和高保真度凸显了该物种对快速过度开发的脆弱性以及偏远生境（例如圣约瑟夫环礁）在未来保护中的重要性。此处获得的结果可用于为有关整个物种范围内类似环礁环境的开发和利用的管理决策提供依据。

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  • 来源
    《Marine biology》 |2013年第9期|2425-2436|共12页
  • 作者

    J. D. Filmalter; L. Dagorn; P. D. Cowley;

  • 作者单位

    South African Institute for Aquatic Biodiversity (SAIAB), Private Bag 1015, Grahamstown 6140, South Africa,Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown 6140, South Africa,Institut de Recherche pour le Developpement (IRD), UMR 212, Fishing Port, Victoria, Seychelles;

    Institut de Recherche pour le Developpement (IRD), UMR 212, Fishing Port, Victoria, Seychelles;

    South African Institute for Aquatic Biodiversity (SAIAB), Private Bag 1015, Grahamstown 6140, South Africa;

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