【摘要】 本文对世界濒危鸟类—遗鸥的繁殖地生境、留居时间和分布、繁殖行为、种群数量、食性及天敌等做了较系统的记述。于繁殖地,所见遗鸥皆参与繁殖,性比1:1;有581巢,分属8个巢群,巢的密度0.121—0.547巢/m~2,每巢含卵1—4枚,种群繁殖期约两个月,孵化期24—26天,孵化率100％。更多还原

【Abstract】 This paper Present the results of investigation on the breeding ecology of the Relict Gull (Lorus relictus) at Taolimiao-Alashan Nur in central Ordos of Inner Mongolia AR. In 1990,the first birds of relict gull arrived there on April 6 and all the birds moved away on August 28-29.During the breeding season,the birds lived in/around the salt-water lake making nests on the ground on islets, 8 colonies with 581 nests in total were found in the field work together with 1, 158 individuals as the highest number censused. Nest density varied from 0. 121 to 0. 547 per square metre. Clutch size of 1 to 3 eggs was in the percentages of 20%,41. 3%,and 38. 6% repectively and 4 eggs in one case only. 50 nests were examined randomly showing an incubation rate of 100%.The adult birds fed mostly on aquatic insects and their larvae.更多还原