| Abstract: | Black-winged stilt generally breeds in the north of China, but its breeding sites in the south are rarely reported. In this study, the breeding population of black-winged stilt was found during the bird diversity survey in Haifeng Bird Nature Reserve, Guangdong Province, from May to Jun 2021, and the primary observation and measurement of its breeding ecology was conducted. A total of 80 nests were found in this study, of which 37 had eggs. Most of black-winged stilt selected nest in the reeds of the tidal flats off the water surface, with an average distance of 49 m(0-400 m) from the water surface. The vegetation density at the nest site was 9.4 individuals/m2, and the vegetation density around the nest was 23.7 individuals/m2. The nest of black-winged stilt was simple, with main nest materials of pagatpat and reed and a small amount of small wood, dead branches and stems of sedge. The average outer diameter of nest was 16.7 cm (14-20 cm), the average inner diameter of nest was 15.6 cm (13-20 cm), and the average depth of nest was 2.9 cm (1.5-4 cm). The outer diameter and inner diameter of nests were significantly larger than those of northern nests, while the nest depth was not significantly different. The majority egg number in Haifeng was 4, with an average of 3.175. The length diameter of eggs was 42.8 mm (39.9~47.1 mm) and the short diameter was 31.2 mm (29.4~32.9 mm). There was no significant difference in egg size between Haifeng and the north. |
