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• W2104047897 abstract "Non-native species can have severe negative impacts on native biodiversity (Blackburn et al. 2004, Clavero et al. 2009, but not all do. It is desirable to evaluate the risks posed by non-native species during the early stages of an invasion, when control measures are easiest (Manchester & Bullock 2000, Lodge et al. 2006). However, it is easier to evaluate impacts when an invasion is advanced, as more data are available, allowing competition to be identified with more confidence (Wiens 1989), so most studies investigating the impacts of non-native species (e.g. Newson et al. 2011) are performed once the species is long established. We investigated the impacts of the introduced Black-headed Weaver Ploceus melanocephalus in the Iberian Peninsula during the early stages of its invasion. Black-headed Weavers have been suspected of competing with two ecologically similar native species, the Great Reed Warbler Acrocephalus arundinaceus and the Eurasian Reed Warbler A. scirpaceous (Matias 2002). This could occur due to competition for nestling food or for nest-sites. Black-headed Weavers may exclude native Reed Warblers from reedbed through interspecific territoriality. If this was happening, we would expect to observe aggression between Black-headed Weavers and native species, possibly a response of Black-headed Weavers to playback of the songs of native species, low overlap between territories of Black-headed Weavers and native species, and a shift in the habitat characteristics of native species’ territories to be less similar to Black-headed Weavers. Alternatively, they may reduce the quality of reedbed by depleting resources. If this were happening, we would expect to observe an increase in the size of territories of native species when Black-headed Weavers were present and native species to show a preference for areas further away from Black-headed Weaver territories. We conducted fieldwork at four sites in Portugal from April to June 2012 to collect data to test these hypotheses. The number of territories of each species at our study sites is shown in Table 1. Despite overlapping resource requirements, we did not find evidence for any of the possible signatures of competition. Therefore, our work does not support previous anecdotal suggestions of competition. Despite this, we recommend continued monitoring of the impacts of Black-headed Weavers, as negative impacts may occur once the species reaches higher population densities. We are currently preparing a manuscript for submission to Ibis, which will give full details of the results from this project. We will also submit a report on the project to the Câmara Municipal das Caldas da Rainha, allowing the key findings of the project to be disseminated locally. We are grateful to the BOU for an ornithological research grant of £917, which, alongside a Natural Environment Research Council PhD studentship awarded to Martin Sullivan, funded this study. We thank Hannah Mossman for assistance with fieldwork, Clive Barlow for supplying a recording of the song of Black-headed Weavers, and Helder Cardoso, Vitor Encarnacão, the ICNB and Associação PATO for assisting with logistics in the field and providing access to field sites." @default.
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• W2104047897 date "2013-12-16" @default.
• W2104047897 modified "2023-09-27" @default.
• W2104047897 title "Assessing the impacts of the non-native Black-headed Weaver on nativeAcrocephaluswarblers" @default.
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• W2104047897 doi "https://doi.org/10.1111/ibi.12104" @default.
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