基于无人机摄影测量和深度神经网络的普氏裸鱼迁移时空分布研究

IF 4.6 Q2 ENVIRONMENTAL SCIENCES Journal of ecohydraulics Pub Date : 2021-06-15 DOI:10.1080/24705357.2021.1892547
Chendi Zhang, Mengzhen Xu, F. Lei, Jiahao Zhang, G. Kattel, Yongjie Duan
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引用次数: 7

摘要

裸鲤(gymnocyis przewalskii)在中国最大的盐碱湖青海湖的生态系统中起着核心作用。成鱼每年从青海湖大群、高种群密度地洄游到上游淡水河流产卵。然而,在青海湖地区的河湖网络迁移过程中,鱼类对当地非生物线索的响应以分布模式的形式仍然未知。这种知识差距降低了该区域鱼类养护和管理工作的效率。为了解决这一问题,我们于2018年6月至8月,在无人机的帮助下,对200米长的迁徙路线上具有多种形态和水力特征的背道进行了两次实地调查。将运动摄影测量结构与深度神经网络技术相结合,建立了一种大型鱼群个体轮廓检测与提取的新工作流程。鱼类的时空分布格局表明,裸鱼在迁徙过程中受到高流速或深水的水力环境的吸引。温度和光照的日变化可以改变鱼类对水力环境的偏好。我们的研究结果强调了河流形态与水力学、水温和光线之间的相互作用对裸鲤迁移行为的关键作用。
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Spatio-temporal distribution of Gymnocypris przewalskii during migration with UAV-based photogrammetry and deep neural network
Abstract The naked carp (Gymnocypris przewalskii) plays a central role in the ecosystem of the Qinghai Lake, the largest saline-alkaline lake in China. The adult naked carp migrates in large groups with high population density annually from the Qinghai Lake to the upstream freshwater rivers to spawn. Nevertheless, the responsiveness of the fish to local abiotic cues in the form of distribution patterns during migration across the riverine-lacustrine network of the Qinghai Lake region remains unknown. This knowledge gap has reduced efficiency in fish conservation and management efforts in the region. To address this issue, we carried out two field surveys from June to August, 2018, with the aid of unmanned aerial vehicles to a 200-m long back channel characterizing diverse morphological and hydraulic features on the migration route. Combined structure from motion photogrammetry and deep neural network techniques were used to establish a new workflow for detecting and extracting the profiles of fish individuals in large schools. The spatio-temporal distribution pattern of the fish demonstrated that the naked carp was attracted by hydraulic environments with high flow velocity or deep-water during migration. The diurnal variation of temperature and light could alter the preference for hydraulic environments of the fish. Our results highlight the crucial role of the interactions between river morphology and hydraulics, water temperature and light on the migration behaviours of the naked carp.
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