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Nine months in the Simpson Desert: The anatomy of a letter-winged kite breeding irruption
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jaridenv.2020.104138
Chris R. Pavey , Lisa M. Nunn , Peter J. Nunn , Catherine E.M. Nano

Abstract Highly mobile animals in the world's drylands can have distinct core and irruptive ranges with the latter being occupied only during population outbreaks driven by resource pulses. Breeding events occur within the irruptive range during these periods of high resource availability. Here we quantify such an event involving the letter-winged kite (Elanus scriptus) in the Simpson Desert, Australia; a region that experiences major rainfall-driven pulses in primary productivity. The irruption of kites lasted for a minimum of nine months (12 July 2016 to 24 May 2017). Breeding was confined to July–October 2016. Population size rose from an initial count of 22 adults in July to a peak of 38 adults and 19 juveniles in October 2016. The pattern of aggregation during 2016 consisted of dispersed breeding individuals whereas by 2017 this pattern was replaced by larger non-breeding aggregations. Kites arrived in the area when small mammal abundance was relatively low, but was increasing, and bred as the abundance of small mammals reached its peak. Unexpectedly, kites departed the area when abundance of small mammals was still high and sufficient to support an additional breeding event in winter-spring 2017. Our study provides insights in to the duration and size of breeding events in the irruptive range of nomadic birds. From a management perspective it identifies the importance of the keystone tree species, Acacia peuce, as a nesting site.

中文翻译:

辛普森沙漠中的九个月:信翅风筝繁殖爆发的解剖

摘要 世界旱地中高度流动的动物可以具有不同的核心和侵入范围,后者仅在资源脉冲驱动的种群爆发期间被占用。在这些高资源可用性时期,繁殖事件发生在破坏性范围内。在这里,我们量化了这样一个涉及澳大利亚辛普森沙漠中的信翅风筝(Elanus scriptus)的事件;一个在初级生产力方面经历主要降雨驱动脉冲的地区。风筝的入侵持续了至少九个月(2016 年 7 月 12 日至 2017 年 5 月 24 日)。繁殖仅限于 2016 年 7 月至 10 月。 种群规模从 7 月的初始数量 22 只增加到 2016 年 10 月的 38 只成鱼和 19 只幼鱼。2016 年的聚集模式由分散的繁殖个体组成,而到 2017 年,这种模式被更大的非繁殖聚集所取代。风筝在小型哺乳动物的丰度相对较低时到达该地区,但随着小型哺乳动物的丰度达到顶峰而逐渐增加。出乎意料的是,当小型哺乳动物的丰度仍然很高并且足以支持 2017 年冬春季的额外繁殖活动时,风筝离开了该地区。我们的研究提供了关于游牧鸟类入侵范围内繁殖活动的持续时间和规模的见解。从管理的角度来看,它确定了关键树种 Acacia peuce 作为筑巢地点的重要性。并随着小型哺乳动物的数量达到顶峰而繁殖。出乎意料的是,当小型哺乳动物的丰度仍然很高并且足以支持 2017 年冬春季的额外繁殖活动时,风筝离开了该地区。我们的研究提供了关于游牧鸟类入侵范围内繁殖活动的持续时间和规模的见解。从管理的角度来看,它确定了关键树种 Acacia peuce 作为筑巢地点的重要性。并随着小型哺乳动物的数量达到顶峰而繁殖。出乎意料的是,当小型哺乳动物的丰度仍然很高并且足以支持 2017 年冬春季的额外繁殖活动时,风筝离开了该地区。我们的研究提供了关于游牧鸟类入侵范围内繁殖活动的持续时间和规模的见解。从管理的角度来看,它确定了关键树种 Acacia peuce 作为筑巢地点的重要性。
更新日期:2020-06-01
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