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首页> 外文期刊>Marine biology >Seasonal occurrence and site fidelity of juvenile bronze whalers (Carcharhinus brachyurus) in a temperate inverse estuary
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Seasonal occurrence and site fidelity of juvenile bronze whalers (Carcharhinus brachyurus) in a temperate inverse estuary

机译：温带逆河口幼年青铜捕鲸（Carcharhinus brachyurus）的季节性发生和部位保真度

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摘要

Assessing the movements and habitat use of wide-ranging predators is critical for understanding their role within an ecosystem and vulnerability to anthropogenic threats. The bronze whaler (Carcharhinus brachyurus) is a large-bodied, slow-growing shark species that is widely distributed throughout temperate Australian waters. Currently, habitat use, spatio-temporal presence and fine-scale movement information is unknown for Southern Australian waters. This study investigated the spatio-temporal patterns of occurrence, habitat use, and residency of bronze whalers in Gulf St. Vincent, South Australia. Forty-seven predominately small juvenile bronze whalers (83% of tagged sharks150cm TL) were tagged with acoustic transmitters from 2009 to 2014 and monitored for periods of up to 55months (range 516-1634days; mean +/- standard error 825 +/- 47). The seasonal presence of bronze whalers peaked in spring-early autumn (September-April). Site fidelity was high, with 77% of tagged sharks detected over multiple years and 36% detected over 3years. Low estimates of mean residency index (R-i=0.05 +/- 0.01) indicated that time spent within the array was limited. Shark occurrence was driven by a combination of factors, which included water temperature, season, moon illumination, and wind speed. Manly-Chesson's Electivity Index showed bronze whalers exhibited the highest affinity to seagrass (Posidonia spp.), suggesting that this habitat plays an important role in the early life history stages. The slow growth and low productivity of bronze whalers combined with its predictable nearshore occurrence result in this species having an increased susceptibility to anthropogenic threats, which highlights the need for continued monitoring and vulnerability assessments.
机译：评估各种捕食者的运动和栖息地使用情况对于了解它们在生态系统中的作用以及对人为威胁的脆弱性至关重要。青铜捕鲸者（Carcharhinus brachyurus）是一种大体，生长缓慢的鲨鱼，广泛分布于澳大利亚温带水域。目前，南澳大利亚州水域尚无栖息地利用，时空存在和精细运动信息。这项研究调查了南澳大利亚州圣文森特海湾青铜捕鲸者的时空分布，栖息地使用和居住情况。从2009年至2014年，对47个主要是小型青铜捕鲸者（占标记的鲨鱼<150cm TL的83％）进行了声发射器标记，并进行了长达55个月的监测（范围516-1634天；平均+/-标准误差825 + / -47）。青铜捕鲸者的季节性活动在春季初秋（9月至4月）达到顶峰。现场保真度很高，在多年内检测到77％的带标签鲨鱼，在三年内检测到36％的鲨鱼。对平均驻留指数的估计值较低（R-i = 0.05 +/- 0.01），表明在阵列中花费的时间有限。鲨鱼的发生是由多种因素共同驱动的，这些因素包括水温，季节，月球光照和风速。曼利·切森（Manly-Chesson）的电气化指数显示，青铜捕鲸者对海草（Posidonia spp。）表现出最高的亲和力，表明该栖息地在生命早期阶段起着重要作用。青铜捕鲸者的缓慢生长和低生产率，加上其可预测的近岸发生，导致该物种对人为威胁的敏感性增加，这突出表明需要继续进行监测和脆弱性评估。

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  • 来源
    《Marine biology》 |2019年第5期|56.1-56.17|共17页
  • 作者

    Drew Michael; Rogers Paul; Lloyd Matthew; Huveneers Charlie;

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    South Australia Res & Dev Inst Aquat Sci, Finfish Subprogram, Adelaide, SA 5024, Australia|Flinders Univ S Australia, Coll Sci & Engn, Biol Sci, Southern Shark Ecol Grp, Adelaide, SA 5043, Australia;

    South Australia Res & Dev Inst Aquat Sci, Finfish Subprogram, Adelaide, SA 5024, Australia;

    Flinders Univ S Australia, Coll Sci & Engn, Biol Sci, Southern Shark Ecol Grp, Adelaide, SA 5043, Australia;

    Flinders Univ S Australia, Coll Sci & Engn, Biol Sci, Southern Shark Ecol Grp, Adelaide, SA 5043, Australia;

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