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Projeto de investigação
BIRDS ON THE MOVE: adaptive migratory behaviour in response to global environmental change
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Combining remote sensing and tracking data to quantify species' cumulative exposure to anthropogenic change
Publication . Buchan, Claire; Gilroy, James J.; Catry, Inês; Hewson, Chris M.; Atkinson, Philip W.; Franco, Aldina M. A.
Identifying when and where organisms are exposed to anthropogenic change is cru-cial for diagnosing the drivers of biodiversity declines and implementing effective conservation measures. Accurately measuring individual-scale exposure to anthro-pogenic impacts across the annual cycle as they move across continents requires an approach that is both spatially and temporally explicit—now achievable through recent parallel advances in remote-sensing and individual tracking technologies. We combined 10 years of tracking data for a long-distance migrant, (common cuckoo, Cuculus canorus), with multi-dimensional remote-sensed spatial datasets encompass-ing thirteen relevant anthropogenic impacts (including infrastructure, hunting, habitat change, and climate change), to quantify mean hourly and total accumulated expo-sure of tracked individuals to anthropogenic change across each stage of the annual cycle. Although mean hourly exposure to anthropogenic change was greatest in the breeding stage, accumulated exposure to changes associated with direct mortality risks (e.g., built infrastructure) and with climate were greatest during the wintering stage, which comprised 63% of the annual cycle on average for tracked individuals. Exposure to anthropogenic change varied considerably within and between migra-tory flyways, but there were no clear between-flyway differences in overall exposure during migration stages. However, more easterly autumn migratory routes were sig-nificantly associated with lower subsequent exposure to anthropogenic impacts in the winter stage. Cumulative change exposure was not significantly associated with recent local-scale population trends in the breeding range, possibly because cuck-oos from shared breeding areas may follow divergent migration routes and therefore encounter very different risk landscapes. Our study highlights the potential for the integration of tracking data and high- resolution remote sensing to generate valuable and detailed new insights into the impacts of environmental change on wild species.
Anthropogenic food subsidies reshape the migratory behaviour of a long-distance migrant
Publication . Marcelino, J.; Franco, A.M.A.; Acácio, M.; Soriano-Redondo, A.; Moreira, F.; Catry, I.
Bird migratory journeys are often long and hostile, requiring high energetic expenditure, and thus forcing birds to
pause between migratory flights. Stopover sites allow migrants to replenish fuel reserves and rest, being crucial for
the success of migration. Worldwide, the increasing accumulation of waste on landfills and rubbish dumps has been
described to provide superabundant food resources for many bird species not only during the breeding and wintering
seasons but also during migration, being used as stopover sites.
Using GPS-tracking data of juvenile white storks (Ciconia ciconia) during their first migration from the Iberia Peninsula
to the sub-Saharan wintering grounds, we uncover the effects of stopping en route on individual migratory perfor-
mance. Particularly, we examine the benefits of stopping at artificial sites (landfills and rubbish dumps) when com-
pared to natural stopover sites (wetlands, agricultural or desert areas) and explore the influence of anthropogenic
food resources on storks' migratory strategies.
Overall, white storks spent up to one-third of the migration in stopovers. We found that birds that stopped for longer
periods made more detours, increasing migration duration by half a day for each stopover day. Stopping more often
did not reflect on increasing in-flight energetic efficiency nor the likelihood of completing the migration.
Juvenile storks used artificial sites in 80 % of the stopover days, spending 45 % less time and 10 % less energy foraging
than when using natural stopovers. While stopping in landfills did not translate into differences in migratory
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Entidade financiadora
Fundação para a Ciência e a Tecnologia
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CEEC IND4ed
Número da atribuição
2021.03224.CEECIND/CP1668/CT0005