Data for: Geolocation and immersion loggers reveal year-round residency and consequent nutrient deposition rates of adult red-footed boobies in the Chagos Archipelago, tropical Indian Ocean

Bio-logging has revealed much about high-latitude seabird migratory strategies, but migratory behaviour in tropical species may differ, with implications for understanding nutrient deposition. Here we use combined light-level and saltwater immersion loggers to study the year-round movement behaviour of adult red-footed boobies (Sula sula rubripes) from the Chagos Archipelago, tropical Indian Ocean to assess migratory movements and estimate nutrient deposition rates based on the number of days they spent ashore. Light levels suggest that red-footed boobies are resident in the Chagos Archipelago year-round, although there are large latitudinal errors this close to the equator. Immersion data also indicate residency with tracked birds returning to land every one or two days. Spending an average of 79.86 ± 2.80 days and 280.84 ± 2.64 nights per year on land allows us to estimate that the 21,670 pairs of red-footed boobies deposit 37.34 ± 0.56 tonnes year-1 of guano-derived nitrogen througho..., RFBs were tracked from Barton Point, Diego Garcia, Chagos Archipelago between January 2018 and February 2020. Adults were fitted with combined geolocation and immersion loggers (Intigeo C330, Migrate technology, Cambridge, UK; 3.3g) attached to a multi-layered impact acrylic leg ring (Interrex-rings, Poland). Immersion data were processed using the ExMove toolkit (Langley et al. In press, Journal Animal Ecology) to create a standardised data frame., , # Data for: Geolocation and immersion loggers reveal year-round residency and consequent nutrient deposition rates of adult red-footed boobies in the Chagos Archipelago, tropical Indian Ocean [https://doi.org/10.5061/dryad.t4b8gtj8x](https://doi.org/10.5061/dryad.t4b8gtj8x) Data of red-footed booby, *Sula sula,* immersion from year-round GLS logger deployments. Immersion data represent times when loggers were wet or dry, which we use to estimate year-round colony attendance. ## Description of the data and file structure Data have been processed using the ExMove workflow ([https://exmove.github.io](https://exmove.github.io) ) to create a standardised and clean file with the following columns: * ID: individual bird ID * Date * Time (GMT) * Immersion: logger immersion values per 10 minute period, where 0 = dry and 20 = wet. * DateTime (GMT) * Species: where \"RFB\" denotes red-footed booby * Population: where \"DG\" denotes Diego Garcia * Age * Sex: Female / Male / Unkno...生物遥测记录（bio-logging）已探明诸多高纬度海鸟的迁徙策略，但热带物种的迁徙行为或存在显著差异，该发现对阐释养分沉积过程具有重要参考价值。本研究结合光级传感器与海水浸没式记录仪，对热带印度洋查戈斯群岛的成年红脚鲣鸟（*Sula sula rubripes*）开展全年活动行为监测，通过其登陆天数评估迁徙活动并估算养分沉积速率。 光级数据显示红脚鲣鸟全年定居于查戈斯群岛，但由于该区域紧邻赤道，纬度定位存在较大误差。浸没式监测数据同样证实了其定居特性，被追踪个体每1至2日便会返回陆地栖息。成年红脚鲣鸟年均在陆地停留79.86±2.80日与280.84±2.64夜，据此估算，查戈斯群岛的21670对红脚鲣鸟每年可沉积37.34±0.56吨鸟粪源氮素…… 本研究于2018年1月至2020年2月期间，在查戈斯群岛迪戈加西亚岛巴顿角对红脚鲣鸟（RFB）开展追踪监测。成年个体被安装了集成地理定位与浸没监测功能的记录仪（Intigeo C330，Migrate technology，英国剑桥；重量3.3g），记录仪通过多层抗冲击亚克力脚环（Interrex-rings，波兰）固定于腿部。浸没数据通过ExMove工具包（Langley等，已接收，《动物生态学杂志》(Journal Animal Ecology)）处理，生成标准化数据集。 # 数据集说明：地理定位与浸没记录仪揭示热带印度洋查戈斯群岛成年红脚鲣鸟的全年定居特性及其养分沉积速率 https://doi.org/10.5061/dryad.t4b8gtj8x 本数据集源自全年地理光级传感器记录仪（GLS logger）部署获取的红脚鲣鸟（*Sula sula*）浸没数据。浸没数据记录了记录仪处于湿润与干燥状态的时长，用于估算种群全年栖息频次。 ## 数据与文件结构说明 数据集已通过ExMove工作流（https://exmove.github.io）处理，生成标准化洁净数据集，包含以下字段： * **ID**：个体鸟类编号 * **Date**：日期 * **Time (GMT)**：时间（格林尼治标准时间） * **Immersion**：每10分钟周期的记录仪浸没值，其中0代表干燥，20代表湿润 * **DateTime (GMT)**：格林尼治标准时间日期时间 * **Species**：物种，其中"RFB"代表红脚鲣鸟 * **Population**：种群，其中"DG"代表迪戈加西亚种群 * **Age**：年龄 * **Sex**：性别（雌性/雄性/未知……）