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Use of anthropogenic-related nest material and nest parasite prevalence have increased over the past two centuries in Australian birds

  • Global change ecology – original research
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Abstract

Global plastic production has increased exponentially since the 1940s, resulting in the increased presence of anthropogenic debris in the environment. Recent studies have shown that birds incorporate anthropogenic debris into their nests, which can reduce nest ectoparasite loads. However, we know little about the long-term history of interactions among birds, anthropogenic debris, and ectoparasites. Our study took a unique approach to address this issue by determining the prevalence of anthropogenic debris and ectoparasitic nest flies (Protocalliphora and Passeromyia spp.) in 893 bird nests from 224 species between 1832 and 2018, which were sourced from Australian museum collections. The prevalence of anthropogenic material increased from approximately 4% in 1832 to almost 30% in 2018. This change was driven by an increase in the incorporation of synthetic rather than biodegradable anthropogenic debris (by 2018 ~ 25% of all nests contained synthetics), with the first synthetic item being found in a nest from 1956 in the city of Melbourne. Nest parasite prevalence increased over time but contrary to other studies, there was no relationship between habitat type or anthropogenic material and parasite presence. Our study is the first to use museum specimens to quantify temporal and spatial impacts of anthropogenic material on birds, the results of which justifies contemporary concerns regarding the ubiquitous nature of human impacts on terrestrial wildlife.

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Acknowledgements

We thank Leo Joseph from CSIRO in Canberra and Karen Roberts from Melbourne Museum for access to collections. Funding for this project was provided by DAAD Rise Worldwide and a USC internal grant.

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DAP conceived and designed the study, DAP, FO, and KAT undertook data collection and initial data interpretation, FO and DAP conducted statistical analyses and wrote the first manuscript draft, DAP, FO, and SAK produced figures, and DAP, FO, KAT, and SAK contributed to further results interpretation, background research, writing and editing of the manuscript.

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Correspondence to Dominique A. Potvin.

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Potvin, D.A., Opitz, F., Townsend, K.A. et al. Use of anthropogenic-related nest material and nest parasite prevalence have increased over the past two centuries in Australian birds. Oecologia 196, 1207–1217 (2021). https://doi.org/10.1007/s00442-021-04982-z

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  • DOI: https://doi.org/10.1007/s00442-021-04982-z

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