Arid
DOI10.1007/s10530-016-1294-z
Estimating the extent of seabird egg depredation by introduced Common Mynas on Ascension Island in the South Atlantic
Hughes, B. John1; Martin, Graham R.2; Reynolds, S. James1,2
通讯作者Hughes, B. John
来源期刊BIOLOGICAL INVASIONS
ISSN1387-3547
EISSN1573-1464
出版年2017
卷号19期号:3页码:843-857
英文摘要

Common Mynas Acridotheres tristis were introduced to the small, isolated barren island of Ascension in the tropical Atlantic Ocean in the 1880s. The founder population of 52 pairs increased at a rate of 2 % per annum. Mynas cause egg losses in other species by puncturing and consuming eggs, puncturing eggs with no consumption or displacing incubating birds that then desert viable eggs. The principal target seabirds of Mynas on Ascension Island are Sooty Terns Onychoprion fuscatus which number 388,000 birds and constitute 97 % of all seabirds on the island. Five censuses of Mynas and 20 of the Sooty Tern population were carried out between 1994 and 2015, and Myna depredation was monitored on 10 occasions between 2000 and 2008. Of all seabird eggs laid annually, we estimated that 19 % of them were depredated by c. 1000 Mynas. In declining severity of impacts of Mynas on all eggs lost, we estimated that 40 % was attributable to desertion, 39 % to puncturing eggs with no consumption and 21 % to puncturing and consumption. As far as we know, our study is the first to estimate the scale of seabird egg depredation by Mynas. Care is needed when applying our findings to other seabird populations. The scarcity of alternative food sources and the ease of locating high densities of Sooty Tern eggs on Ascension Island may have magnified the frequency of egg depredation by Mynas. That said, it is clear that Mynas are major egg predators and the severity of their impacts on native avian populations can be high.


英文关键词Non-native species Population size Predation rate Sooty Tern
类型Article
语种英语
国家England
收录类别SCI-E
WOS记录号WOS:000394152700009
WOS关键词ESTABLISHMENT ; POPULATION ; PREDATION ; SUCCESS ; BIRDS
WOS类目Biodiversity Conservation ; Ecology
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/197840
作者单位1.Prince Consorts Lib, Army Ornithol Soc, Knollys Rd, Aldershot GU11 1PS, Hants, England;
2.Univ Birmingham, Sch Biosci, Coll Life & Environm Sci, Ctr Ornithol, Birmingham B15 2TT, W Midlands, England
推荐引用方式
GB/T 7714
Hughes, B. John,Martin, Graham R.,Reynolds, S. James. Estimating the extent of seabird egg depredation by introduced Common Mynas on Ascension Island in the South Atlantic[J],2017,19(3):843-857.
APA Hughes, B. John,Martin, Graham R.,&Reynolds, S. James.(2017).Estimating the extent of seabird egg depredation by introduced Common Mynas on Ascension Island in the South Atlantic.BIOLOGICAL INVASIONS,19(3),843-857.
MLA Hughes, B. John,et al."Estimating the extent of seabird egg depredation by introduced Common Mynas on Ascension Island in the South Atlantic".BIOLOGICAL INVASIONS 19.3(2017):843-857.
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