Breeding performance of the Imperial Shag (Phalacrocorax atriceps) in relation to year, laying date and nest location
Breeding performance of the Imperial Shag (Phalacrocorax atriceps) in relation to year, laying date and nest location
复制标题
帝王鸬鹚 (Phalacrocorax atriceps) 的繁殖表现与年份、产蛋日期和巢穴位置的关系
DOI：
10.1071/mu10062
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
F. Quintana
中科院分区：
文献类型：
--
作者：
W. Svagelj;F. Quintana
摘要海鸟的繁殖能力在整个繁殖季节通常会下降。种群鸟类的繁殖效率也被发现受到从巢到种群边缘的距离的影响，外围巢通常比中心巢的生产力低。研究了2004 - 2006年3个繁殖季节（阿根廷Punta León）产蛋日期和巢位（离群落边缘的距离）对帝国长尾（Phalacrocorax atriceps）卵数和繁殖成功率的影响。产蛋年份、产蛋日期、巢位与卵窝大小变化无明显关系。此外，尽管繁殖成功率在年份之间没有差异，但繁殖成功率随着产卵日期的增加而下降。我们还发现产卵日期和筑巢地点之间存在交互作用。离群体边缘的距离与早、高峰产卵的长毛卷毛卷毛的繁殖成功率无关，但晚育的长毛卷毛卷毛卷毛卷毛的繁殖成功率随着离群体边缘的距离的增加而增加。我们发现繁殖成功率的季节性下降与海鸟表现出的典型模式一致。我们的研究结果表明，在繁殖季节后期繁殖的低质量（年轻或能力较差）的配对可能会从远离殖民地边缘的筑巢中受益，减少干扰水平和巢穴捕食的风险。
Abstract The breeding productivity of seabirds usually declines over the course of a breeding season. Breeding productivity in colonial birds has also been found to be affected by the distance from a nest to the edge of a colony, with peripheral nests usually having lower productivity than centrally located nests. We evaluated the influence of laying date and nest location (distance from the edge of the colony) on clutch-size and breeding success of the Imperial Shag (Phalacrocorax atriceps) during three breeding seasons (2004–06) at Punta León, Argentina. There was no relationship between year, laying date or nest location and variation in clutch-size. Further, whereas breeding success did not differ between years, breeding success consistently decreased with laying date. We also found an interactive effect between laying date and nest location. Distance from the edge of the colony was not related to breeding success of Shags that laid either early or at the peak of the season, but the breeding success of late breeders increased with distance from the edge of the colony. Our findings of a seasonal decline in breeding success are consistent with the typical pattern exhibited by seabirds. Our results suggest that low-quality (young or less-capable) pairs that breed late in the season may benefit from nesting away from the edge of the colony, reducing levels of disturbance and risk of nest-predation.