List of bird species in the breeding season of 2020 in the Zhoushan Archipelago, China

List of bird species in the breeding season of 2020 in the Zhoushan Archipelago, China Duorun Wang^{1, #}, Yuhao Zhao^{1, #}, Shupei Tang¹, Xiangxu Liu¹, Wande Li¹, Peng Han¹, Di Zeng¹, Yangheshan Yang¹, Guangpeng Wei¹, Yi Kang¹, Xingfeng Si¹* ¹ Institute of Eco-Chongming (IEC), Zhejiang Tiantong Forest Ecosystem National Observation and Research Station, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China; ^# These authors contributed equally to this work and should be considered co-first authors; * Corresponding author: Xingfeng Si: [e-mail] <br> We surveyed bird assemblages on study islands in Zhoushan Archipelago in the breeding season of 2020 (from April to June). We setup transects on each island to cover various habitat types for birds except highly urbanized regions (<em>i.e.</em>, cities and towns). For the largest island (Island 1: Zhoushan Island), we set eight transects. For the rest of study islands, we set one, two, or four transects that the number of transects was based on the area and land-use types of study islands. We used Global Positioning System (GPS) to record the position and the length of each transect. The transect length is 2 km on most study islands. However, the transect length is restricted to 1 km for several small islands, as the steep terrain (<em>e.g.</em>, cliffs near the edges) does not allow us to set a 2-km transect. For bird surveys, at least two well-trained surveyors walked at a constant speed (<em>ca</em>. 1.5 km/h) along transects and recorded the identities and abundances of all birds heard and seen. Bird surveys were conducted two hours after sunrise and one hours before sunset, and the overall surveying time was restricted to two hours in each survey. We only conducted bird surveys on days with good weather conditions, excluding heavy raining or strong windy days. All transects were surveyed twice which is the maximum survey effort we can afford due to the large region of the Zhoushan Archipelago, the limited transportations in this region and the relatively short period of the breeding season. Surveyors walked the transects in a random order by inversing the starting point to avoid survey biases.

中国舟山群岛2020年繁殖季鸟类物种名录

王多润^{1, #}, 赵宇昊^{1, #}, 唐书培¹, 刘祥旭¹, 李万德¹, 韩鹏¹, 曾迪¹, 杨燕山¹, 韦广鹏¹, 康毅¹, 司兴峰^1*
¹ 华东师范大学生态与环境科学学院，浙江天童森林生态系统国家野外科学观测研究站，长江口生态研究中心（Institute of Eco-Chongming, IEC），上海 200241，中国；
^# 本文两位第一作者对本研究贡献等同，可视为共同第一作者；
* 通讯作者：司兴峰，电子邮箱：[e-mail]

本研究于2020年繁殖季（4月至6月）对舟山群岛的研究样岛开展鸟类群落调查。我们在每个样岛上设置样线，以覆盖除高度城市化区域（即城镇建成区）外的各类鸟类栖息生境。对于最大的样岛（1号岛：舟山本岛），我们设置了8条样线；对于其余样岛，样线数量设置为1、2或4条，具体数量依据样岛的面积与土地利用类型确定。我们采用全球定位系统（Global Positioning System, GPS）记录每条样线的位置与长度。多数样岛的样线长度为2 km，但部分小型岛屿因地形陡峭（如沿岸悬崖）无法设置2 km长的样线，故将样线长度限定为1 km。鸟类调查时，至少由2名经过专业培训的调查员以恒定速度（约1.5 km/h）沿样线行进，记录沿途所见所闻的所有鸟类的种类与数量。调查于日出后2小时至日落前1小时之间开展，单次调查的总时长限定为2小时。仅在天气状况良好的日期开展调查，避开强降雨或大风天气。由于舟山群岛地域广阔、区域内交通条件有限，且繁殖季周期较短，我们对所有样线均开展了2次调查，这已是本研究能够达到的最大调查强度。调查员通过随机调整出发起点的方式，按随机顺序行进样线，以避免调查偏差。