Bird diversity in different counties in Yangtze River Basin from 2011 to 2020.xlsx

The monitoring of breeding birds and wintering birds were conducted in 536 monitoring sites during 2011 and 2020. The monitoring sites were selected based on complementarity and stratified random sampling, covering all ecosystem types and elevation gradient. According to climatic characteristics, and activity rhythm of birds in the YRB, field surveys of breeding birds were conducted from March to July each year, covering the early and late breeding periods. A line transect method was used. The length of each line transect was set as 1–3 km. These line transects did not overlap and covered different habitat types and altitudinal belts. The sampling point method was used in the field surveys of wintering birds for some important lakes in the YRB, such as Poyang Lake, Dongting Lake, Caizi Lake, and other major lakes and wetlands.