Tracking data highlight the importance of human-induced mortality for large migratory birds at a flyway scale

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2024
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Serratosa, Juan
Oppel, Steffen
Rotics, Shay
Santangeli, Andrea
Butchard, Stuart H.M.
Cano-Alonso, Luis H.S.
Telleria, Jose Luis
Kemp, Ryno
Nicholas, Aaron
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Biological Conservation. Elsevier. 2024(293), 110525. ISSN 0006-3207. eISSN 1873-2917. Available under: doi: 10.1016/j.biocon.2024.110525
Zusammenfassung

Human-induced direct mortality affects huge numbers of birds each year, threatening hundreds of species worldwide. Tracking technologies can be an important tool to investigate temporal and spatial patterns of bird mortality as well as their drivers. We compiled 1704 mortality records from tracking studies across the African-Eurasian flyway for 45 species, including raptors, storks, and cranes, covering the period from 2003 to 2021. Our results show a higher frequency of human-induced causes of mortality than natural causes across taxonomic groups, geographical areas, and age classes. Moreover, we found that the frequency of human-induced mortality remained stable over the study period. From the human-induced mortality events with a known cause (n = 637), three main causes were identified: electrocution (40.5 %), illegal killing (21.7 %), and poisoning (16.3 %). Additionally, combined energy infrastructure-related mortality (i.e., electrocution, power line collision, and wind-farm collision) represented 49 % of all human-induced mortality events. Using a random forest model, the main predictors of human-induced mortality were found to be taxonomic group, geographic location (latitude and longitude), and human footprint index value at the location of mortality. Despite conservation efforts, human drivers of bird mortality in the African-Eurasian flyway do not appear to have declined over the last 15 years for the studied group of species. Results suggest that stronger conservation actions to address these threats across the flyway can reduce their impacts on species. In particular, projected future development of energy infrastructure is a representative example where application of planning, operation, and mitigation measures can enhance bird conservation.

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ISO 690SERRATOSA, Juan, Steffen OPPEL, Shay ROTICS, Andrea SANTANGELI, Stuart H.M. BUTCHARD, Luis H.S. CANO-ALONSO, Jose Luis TELLERIA, Ryno KEMP, Aaron NICHOLAS, Martin WIKELSKI, 2024. Tracking data highlight the importance of human-induced mortality for large migratory birds at a flyway scale. In: Biological Conservation. Elsevier. 2024(293), 110525. ISSN 0006-3207. eISSN 1873-2917. Available under: doi: 10.1016/j.biocon.2024.110525
BibTex
@article{Serratosa2024Track-69779,
  year={2024},
  doi={10.1016/j.biocon.2024.110525},
  title={Tracking data highlight the importance of human-induced mortality for large migratory birds at a flyway scale},
  number={293},
  issn={0006-3207},
  journal={Biological Conservation},
  author={Serratosa, Juan and Oppel, Steffen and Rotics, Shay and Santangeli, Andrea and Butchard, Stuart H.M. and Cano-Alonso, Luis H.S. and Telleria, Jose Luis and Kemp, Ryno and Nicholas, Aaron and Wikelski, Martin},
  note={Article Number: 110525}
}
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