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Contribution of non-native galliforms to annual variation in biomass of British birds
Biological Invasions ( IF 2.9 ) Pub Date : 2021-01-23 , DOI: 10.1007/s10530-021-02458-y
Tim M. Blackburn , Kevin J. Gaston

Millions of individuals of two species of non-native galliform birds, the Common Pheasant (Phasianus colchicus) and Red-legged Partridge (Alectoris rufa) are released into the British countryside annually in late summer, supplementing established breeding populations of these two species. The biomass of birds involved in these releases has been compared to the British breeding bird biomass. However, the validity of this comparison is compromised because the biomass of wild birds varies across the year due to reproduction, mortality and migration. How the biomass of Common Pheasants and Red-legged Partridges compares to that of other British bird species in late summer, or across the whole year, is currently unknown. Here, we produce estimates of how British bird biomass varies across the year, to assess the contribution of the two non-native galliforms to this variation. We show that overall British bird biomass is probably lowest around the start of the breeding season in April, and peaks in late summer and autumn. We estimate that around a quarter of British bird biomass annually is contributed by Common Pheasants and Red-legged Partridges, and that at their peak in August these two species represent about half of all wild bird biomass in Britain.



中文翻译:

非本地鸡形对英国鸟类生物量年变化的贡献

数以百万计的两种非本地鸡形鸟,普通野鸡(Phasianus colchicus)和红脚Part(Alectoris rufa))每年夏末释放到英国农村,以补充这两个物种的既定繁殖种群。已经将参与这些释放的鸟类生物量与英国繁殖鸟类生物量进行了比较。但是,由于野生鸟类的生物量由于繁殖,死亡率和迁徙而全年变化,因此该比较的有效性受到了损害。目前尚不清楚夏末或全年中普通野鸡和红脚Part的生物量与其他英国鸟类的生物量相比如何。在这里,我们得出英国鸟类生物量全年变化的估算值,以评估两种非本地鸡形对此变化的贡献。我们显示,整个4月繁殖季节开始前后,英国鸟类的总体生物量可能最低,并在夏末和秋季达到高峰。我们估计,普通野鸡和红脚Part每年贡献约四分之一的英国鸟类生物量,而在八月份的高峰期,这两个物种约占英国所有野生鸟类生物量的一半。

更新日期:2021-01-24
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