Nest occupancy and reproductive outcomes for bald eagle nests in Voyageurs National Park (1973-2016).

Data from repeated areal surveys of bald eagle nests. From 1973-1997, only summary records were available for each nest, each year, listing the number of times it was surveyed, whether it was ever occupied during that year, and what the final reproductive outcome was. For 1998-2016, data included detailed occupancy records and dates for each areal survey conducted each year. Columns are: (1) Year: of monitoring; (2) NestNumber: nest id; (3) SurveyDate: Date nest was surveyed (only for 1998-2016); (4) Visits: number of times each nest was surveyed that given year (also available for 1973-1997 records); (5) WaterDist_m: Distance to the closest permanent lake in meters; (6) MgmtType: 2 if nest was managed using a buffer zone (either 200 or 400 m radius) to minimize human disturbance, 1 if it was not managed; (7) OccCode: 1 if nest was observed to be occupied, 0 otherwise; (8) RepCode: 1 if nest produced one eaglet to near-fledging, 2 if it produced either two or three eagles, 3 if it did not produced any successfully.本数据集源自白头海雕巢穴的重复区域巡查调查。1973年至1997年期间，仅可获取各巢穴每年的汇总记录，内容涵盖该巢穴当年度的调查总次数、是否曾在当年被占用，以及最终的繁殖结果。1998年至2016年期间，数据集则包含了每年每一次区域巡查的详细占用记录与对应调查日期。 数据集字段说明如下： (1) 监测年份（Year）：监测工作开展的年度； (2) 巢穴编号（NestNumber）：巢穴的唯一标识符； (3) 调查日期（SurveyDate）：巢穴接受巡查的日期，仅1998年至2016年的记录包含该字段； (4) 调查频次（Visits）：对应年度内该巢穴的总巡查次数，1973年至1997年的记录中同样包含该字段； (5) 近水距离（WaterDist_m）：巢穴至最近永久性湖泊的距离，单位为米； (6) 管理类型（MgmtType）：若巢穴通过设置半径200米或400米的缓冲区以降低人类干扰，则标记为2；未采取此类管理措施的巢穴则标记为1； (7) 占用编码（OccCode）：若观测到巢穴被占用，则标记为1，否则标记为0； (8) 繁殖编码（RepCode）：若巢穴成功繁育1只接近离巢阶段的幼雕，则标记为1；若繁育2只或3只幼雕，则标记为2；若未成功繁育任何幼雕，则标记为3。