Highly mobile species can be challenging for fisheries management and conservation due to large home ranges combined with dependence on discrete habitat areas where they can be easily targeted or vulnerable to anthropogenic disturbances. Management of the Dusky Shark Carcharhinus obscurus in the northwest Atlantic Ocean has been particularly challenging due to the species’ inherent vulnerability to overfishing and poorly understood habitat associations. To better understand habitat associations and seasonal distributions, we combined telemetry and remotely sensed environmental data to spatially model juvenile Dusky Shark presence probability in the northwest Atlantic Ocean. To accomplish this, 22 juvenile Dusky Sharks (107–220 cm TL) that were tagged with acoustic transmitters at different locations within the U.S. Middle Atlantic Bight region were tracked through networked arrays of acoustic receivers. Tag detections were summarized as daily presence records, and data describing environmental conditions, including depth, chlorophyll‐a concentration, salinity, and sea surface temperature, were extracted at detection locations. These data were used in boosted regression tree models to predict juvenile Dusky Shark presence probability based on environmental parameters during fall 2017 and summer 2018. Telemetry observations and modeled presence probability showed consistent associations with temperatures between 16°C and 26°C and chlorophyll‐a concentrations between 2 and 7 mg/m³, which were associated with seasonal migration timing and monthly spatial distributions. Dusky Shark tag detections and predicted distributions during summer and early fall overlapped areas in the Middle Atlantic Bight that were affected by fisheries and potential offshore energy development. Our methodology provides a framework for assessing climate change effects on distribution.

中文翻译：

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使用声遥测和空间模型识别西北大西洋重要的幼小暗鲨栖息地

由于居家范围广，加上对离散生境区的依赖性，高度易移动的物种对渔业管理和养护可能具有挑战性，因为在这些生境中它们很容易成为目标或容易受到人为干扰。暗鲨Carcharhinus obscurus的管理由于该物种固有的易受过度捕捞的影响以及对生境协会的了解不足，因此在西北大西洋地区尤其具有挑战性。为了更好地了解栖息地的关联性和季节分布，我们将遥测和遥感环境数据结合起来，对西北大西洋中的幼小暗鲨的存在概率进行了空间建模。为了实现这一目标，通过网络化的声波接收器阵列跟踪了22个标有声波发射器的少年鲨鱼（107-220 cm TL），它们在美国中部大西洋湾地区的不同位置进行了追踪。标签检测总结为日常存在记录，并描述环境条件的数据，包括深度，叶绿素a在检测位置提取浓度，盐度和海面温度。这些数据被用于增强回归树模型中，根据环境参数预测2017年秋季和2018年夏季的暗夜鲨的存在概率。遥测观测结果和建模的存在概率表明温度与16°C到26°C之间以及叶绿素a的相关性一致。浓度在2至7 mg / m ^3之间，这与季节性迁徙时间和每月空间分布有关。夏季和初秋期间，Dusky Shark标记检测和预测分布与大西洋中部地区重叠，这些地区受到渔业和潜在海上能源开发的影响。我们的方法提供了评估气候变化对分布影响的框架。