Exploring the seasonal dynamics of coastal movements in white sharks across the North-East Pacific

This is the OBIS extraction of the Ocean Tracking Network and Department of Fisheries and Oceans Canada (DFO) TOPPWS, consisting of the release tagging metadata, i.e. the location and date when the tagged animal was released, and summarized detection events of tagged individuals.
If readers are interested in the source dataset they may also inquire with the project PIs as listed here or on the OTN web site (https://members.oceantrack.org/project?ccode=NEP.TOPPWS).Abstract:Gaining insights into seasonal aggregations of marine megafauna and how patterns vary among demographic groups is pivotal for modeling populations and ecosystem dynamics and evaluating anthropogenic risk exposure. In California, adult and sub-adult white sharks recurrently aggregate on the central coast in fall and winter months, while juveniles are thought to remain present in southern aggregations year-round. However, understanding of movements outside of known aggregation sites, transitions in patterns between ontogenetic groups, and drivers of presence at coastal sites is limited. Using a long-term acoustic tagging program (established in 2006) in Central California, our project focuses on unraveling the coastal movement patterns of white sharks spanning juvenile to adult size ranges. Our expanded receiver array covers both historical aggregation sites and additional locations along the Central California coast, providing a finer-scale investigation into shark movements.

本数据集为海洋跟踪网络（Ocean Tracking Network）与加拿大渔业与海洋部（Department of Fisheries and Oceans Canada, DFO）TOPPWS项目的海洋生物地理信息系统（Ocean Biogeographic Information System, OBIS）提取数据，包含标记动物的放流标记元数据（即标记个体的放流位置与日期），以及标记个体的检测事件汇总数据。
若读者希望获取原始数据集，可联系本文所列的项目首席研究员（Principal Investigators, PIs），或访问海洋跟踪网络官网（https://members.oceantrack.org/project?ccode=NEP.TOPPWS）进行咨询。
摘要：深入了解海洋巨型动物的季节性聚集现象，以及不同种群统计类群间的聚集模式差异，对于种群与生态系统动力学建模、评估人为活动带来的风险暴露水平至关重要。在加利福尼亚海域，成年及亚成年大白鲨会于秋季和冬季周期性聚集在中部海岸区域，而幼年个体则被认为全年栖息于南部聚集区。然而，目前学界对已知聚集位点之外的鲨鱼移动模式、不同个体发育阶段群体间的行为模式转变，以及海岸栖息位点的选择驱动因素的认知仍较为有限。本项目依托2006年启动的加利福尼亚中部长期声学标记计划，旨在阐明大白鲨从幼体到成体全尺寸范围的沿海移动模式。我们拓展的水声接收阵列覆盖了历史聚集位点与加利福尼亚中部海岸沿线的新增监测点位，可开展更精细尺度的鲨鱼移动行为研究。