Mangrove Cuckoo Radio-telemetry Study

Metadata for the file “Mangrove_Cuckoo_location_data_2012_2015.csv”. <br>This file includes data for 16 Mangrove Cuckoos (Coccyzus minor) that were captured and fitted with VHF radio-transmitters. Birds were captured on Sanibel Island, Florida, USA and on the adjacent mainland in Fort Myers, Florida, USA. Radio-tagged birds were tracked between 13 April 2012 - 18 January 2015. Most locations of marked birds were estimated by triangulating the signal of the radio transmitter, as obtained using a handheld radio antenna. Some locations were estimated by an observer in an airplane. Location of individuals detected during aerial searches was estimated from the plane's Global Positioning System (GPS) after the signal had been localized using directional antennae and close circling by the pilot. Based on field trials, the estimated mean telemetry error associated with ground-based telemetry was 35.1 m (SD = 28.6 m; range = 5.7 m - 105.3 m). The telemetry error associated with aerial searches is unknown.<br>The following columns are included in this file:<br>Frequency: The frequency of the attached radio transmitter and the unique identifier for each individual in the study. <br>Latitude: Latitude (decimal degree) of the individual at the specified date and time. <br>Longitude: Longitude (decimal degree) of the individual at the specified date and time. <br>Date: Date and time at which the radio signal was recorded and at which the individual bird’s position (latitude, longitude) was estimated. <br>Aerial_or_ground: Whether the location was estimated by an observer on the ground or an observer in an airplane<br>Location_type: A variable indicating whether the record pertains to the initial capture of the individual or to a subsequent relocation.<br>For more information on these data, contact the principal investigator:<br>John [e-mail]

本文件为「Mangrove_Cuckoo_location_data_2012_2015.csv」的元数据说明。
本文件收录了2012至2015年间16只红树林鹃（Mangrove Cuckoo，学名*Coccyzus minor*）的相关数据，所有个体均被捕获并佩戴了甚高频（VHF）无线电发射器。捕获地点为美国佛罗里达州圣尼贝尔岛（Sanibel Island）及毗邻的迈尔斯堡（Fort Myers）内陆区域。对佩戴发射器的个体的追踪周期为2012年4月13日至2015年1月18日。
绝大多数标记个体的位置通过手持无线电天线接收发射器信号后，采用三角定位法（triangulation）估算得出；部分位置由机载观测人员完成估算。航空搜索中侦测到的个体位置，需先通过定向天线定位信号并由飞行员低空盘旋确认，再通过飞机搭载的全球定位系统（GPS）估算坐标。
根据野外试验结果，地面无线电遥测的平均定位误差为35.1米（标准差SD=28.6米，误差范围5.7米至105.3米）；航空搜索的遥测误差目前尚不明确。
本文件包含以下字段：
1. 频率（Frequency）：所搭载无线电发射器的频率，同时为该研究中每个个体的唯一标识符。
2. 纬度（Latitude）：对应日期与时间下个体的纬度（十进制度格式）。
3. 经度（Longitude）：对应日期与时间下个体的经度（十进制度格式）。
4. 日期时间（Date）：记录无线电信号并估算该鸟类个体位置（纬度、经度）的日期与时间。
5. 观测方式（Aerial_or_ground）：用于标识该位置是由地面观测人员还是机载观测人员估算得出。
6. 位置类型（Location_type）：用于区分该记录为个体的首次捕获位点，还是后续追踪的重定位位点。
如需了解更多该数据集的相关信息，请联系首席研究员：约翰·劳埃德（John Lloyd），电子邮箱：[e-mail]