Hatching behavior of relict gull Larus relictus in Hongjiannao of Shannxi Province, Northwest China
By using e-Science information technology, an investigation was made on the hatching behavior of relict gull (Larus relictus) in the Hongjiannao of Shannxi Province, Northwest China from May to June, 2012. The diurnal hatching rhythms at different hatching stages were as the follows. At daytime, the times of exchanging hatching at the early, medium, and late stages of hatching averaged 6.40±0.45 (re = 68) , 2. 20±0. 12 (n = 66), and 1. 81+0. 10 (n = 48) , the changes of sitting nest direction averaged 35. 34±2. 12 ( n = 68 ) , 18. 73 ±0. 85 ( n=66) , and 15.17±0. 75 ( n = 48) , and the times of turning eggs over averaged 10. 81 ±0. 50 (n = 68), 10. 14±0.55 (n = 66) , and 8.65±0.51 (n = 48), respectively. At night, the times of exchan-ging hatching averaged 2. 37 ±0.20 (n=62), 0. 52±0.06 (n = 60), and 0.53±0.07 (n = 47), the changes of sitting nest direction averaged 16. 16±0. 67 (n = 62) , 4. 28±0. 31 (n = 60), and 3. 87±0.34 (n = 47), and the times of turning eggs over averaged 6. 58±0.40 (n = 62), 4.22± 0. 30 (n = 60) , and 3. 26±0. 22 (n = 47) , respectively. On the days with strong wind and heavy rain, there existed significant differences in the times of exchanging hatching, the changes of sit-ting nest direction, and the times of turning eggs over at the same hatching stages, as compared with those on fine days. The time intervals of exchanging hatching by the parents were mainly 04:00-06:00, 08:00-10:00, and 12:00-14:00. At the late stage of hatching, the duration of sitting nest by the parents was as long as 601.14±31.16 min (n = 56). It was suggested that the parents controlled the egg temperature via regulating the diurnal hatching rhythm to assure the normal development of egg embryo during daytime and night.
国家科技期刊平台
NSTL
万方数据
维普
