Season and site fidelity determine home range of dispersing and resident juvenile Greenland cod (Gadus ogac) in a Newfoundland fjord (Year 2). A Canadian Healthy Oceans Network Population Connectivity, PC-03
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Acoustic telemetry data was collected from November 2011 - November 2012 for 42 individual age 1+ Gadus ogac individuals tagged with Vemco Ltd™ V7-4L coded acoustic tags, programmed to emit a signal at a randomized average delay of every 240 ± 70 s, and a nominal tag life of 415 days. A receiver network comprised of 32 Vemco™ VR2W and VR2 hydrophones allowed for continual detection throughout Newman Sound over a full year. The data presented have been filtered to eliminate spurious detections using both a single detection filter (eliminating lone detections for a single fish over 24 hours) and a conservative speed filter (eliminating detections > 2 body lengths/second apart which could indicate ingestion by a predator). Using known positions of the acoustic receivers, we calculated position estimates in hourly time intervals using a weighted arithmetic mean to increase precision from a presence/absence dataset to a position-based dataset. Therefore the beginning of each hour time interval is indicated in the "Date" and "Time" field. Positions are indicated in decimal degrees in the "COA_Lat" and "COA_Lon" fields of the CSV files. Also included are the ArcGIS defined "POINT_X" and "POINT_Y" fields using a NAD_1983_UTM_Zone_21N projection. Individual fish IDs are included in the "Tag" field. The "Transplant" field indicates whether the individual was in the control group (site of capture = site of release) or the transplant group (site of capture ≠ site of release). Site of capture is indicated by the "Cove" field (HC = Heffern's Cove; BC= Buckley's Cove).
本数据集的声学遥测数据(acoustic telemetry data)采集于2011年11月至2012年11月,共对42尾1龄及以上的格陵兰鳕(Gadus ogac)个体进行标记,所用标记为Vemco Ltd™生产的V7-4L编码声学标签,该标签程序设定为每240±70秒随机平均延迟发射信号,标称标签续航时长为415天。由32台Vemco™ VR2W与VR2水听器组成的接收网络,可在纽曼湾(Newman Sound)实现全年持续信号检测。本次发布的数据已通过双重滤波规则剔除虚假检测记录:一是单检测过滤规则(剔除单尾鱼类在24小时内仅出现1次的检测记录),二是保守速度过滤规则(剔除间隔超过2倍体长/秒的检测记录,此类记录大概率代表鱼类被捕食者吞食)。基于声学接收站的已知坐标,本研究采用加权算术平均法按小时时间步长计算鱼类位置估计值,将原本仅包含存在/缺失信息的数据集转换为基于位置的数据集以提升数据精度。因此,"Date"(日期)与"Time"(时间)字段对应每小时时间区间的起始时刻。CSV文件中的"COA_Lat"与"COA_Lon"字段采用十进制度数表示位置坐标。此外还包含采用NAD_1983_UTM_Zone_21N投影的ArcGIS定义字段"POINT_X"与"POINT_Y"。"Tag"(标签)字段包含每条个体的唯一标识编号。"Transplant"(移植组标识)字段用于区分对照组(捕获位点与放归位点一致)与移植组(捕获位点与放归位点不一致)个体。捕获位点通过"Cove"(海湾)字段标注:HC代表赫弗恩湾(Heffern's Cove),BC代表巴克利湾(Buckley's Cove)。
创建时间:
2014-05-06



