Anthropogenic food subsidies reshape the migratory behaviour of a long-distance migrant

Marcelino, Joana; Franco, Aldina M. A.; Acácio, Marta; Moreira, Francisco; Catry, Inês

doi:10.1016/j.scitotenv.2022.159992

Cited by 4 publications

(3 citation statements)

References 51 publications

(43 reference statements)

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“…Previous evidence from juvenile white storks from Southwest Germany showed similar results, with individuals overwintering in Northwest Africa moving less during stopover days and having lower ODBA values compared with birds wintering south of the Sahara (Flack et al, 2016 ). By contrast, residents and individuals that overwintered in Northwest Africa had access to low‐cost foraging areas at landfills throughout the year (Ciach & Kruszyk, 2010 ; Flack et al, 2016 ; Marcelino et al, 2023 ), while sub‐Saharan migrants forage on natural prey in the Sahel (Elliott et al, 2020 ), which is likely to be energetically more expensive, as reflected by their higher foraging ODBA. Finally, the longer daylight availability in the Sahel region, compared with Southwest Europe and Northwest Africa during the nonbreeding period, could enable sub‐Saharan individuals to increase their diurnal movement activities (Pokrovsky et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“…Here, we assess the phenotypic differences, trade‐offs, and fitness consequences of migration in adult white storks from a partially migratory population breeding in Portugal that is transitioning toward residency (Catry et al, 2017 ; Gilbert et al, 2016 ). Whereas juvenile white storks perform annual migrations to Africa during their first year of life, when they reach adulthood, individuals show a range of fixed seasonal migratory strategies (Acácio et al, 2022 ; Catry et al, 2017 ; Marcelino et al, 2023 ). Some individuals are year‐round residents, remaining either locally or regionally in Southwest Europe; others migrate during the wintering period to Northwest Africa or the sub‐Sahara region (Catry et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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Fitness, behavioral, and energetic trade‐offs of different migratory strategies in a partially migratory species

Franco

Acácio

Payo‐Payo

et al. 2023

Ecology

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Alternative migratory strategies can coexist within animal populations and species. Anthropogenic impacts can shift the fitness balance between these strategies leading to changes in migratory behaviors. Yet some of the mechanisms that drive such changes remain poorly understood. Here we investigate the phenotypic differences, and the energetic, behavioral, and fitness trade‐offs associated with four different movement strategies (long‐ and short‐distance migration, and regional and local residency) in a population of white storks (Ciconia ciconia) that has shifted its migratory behavior over the last decades, from fully long‐distance migration towards year‐round residency. To do this, we tracked 75 adult storks fitted with GPS/GSM loggers with triaxial acceleration sensors over 5 years, and estimated individual displacement, behavior, and overall dynamic body acceleration, a proxy for activity‐related energy expenditure. Additionally, we monitored nesting colonies to assess individual survival and breeding success. We found that long‐distance migrants travelled thousands of kilometers more throughout the year, spent more energy, and > 10% less time resting compared to short‐distance migrants and residents. Long‐distance migrants also spent on average more energy per unit of time while foraging, and less energy per unit of time while soaring. Migratory individuals also occupied their nests later than resident ones, later occupation led to later laying date and lower number of fledglings. However, we did not find significant differences in survival probability. Finally, we found phenotypic differences in the migratory probability, as smaller‐sized individuals were more likely to migrate, and they might be incurring in higher energetic and fitness costs than larger ones. Our results shed light into the shifting migratory strategies in a partially migratory population and highlight the nuances of anthropogenic impacts on species behavior, fitness, and evolutionary dynamics.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fitness, behavioral, and energetic trade‐offs of different migratory strategies in a partially migratory species

Franco

Acácio

Payo‐Payo

et al. 2023

Ecology

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“…For birds, these factors often include availability of food as well as nesting, roosting and perching sites (Miller et al 2017). In some cases, human influence may alter the distribution of these resources in the landscape and provide resources that alter the foraging behaviour, geographical distribution and population dynamics of animals (Hidalgo-Mihart et al 2004, Newsome et al 2015, Petroelje et al 2019, Marcelino et al 2022.…”

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confidence: 99%

Ferruginous Hawk movements respond predictably to intra‐annual variation but unexpectedly to anthropogenic habitats

Isted

Thomas

Warner

et al. 2023

Ibis

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Birds exhibit flexible movement responses to environmental variation across the annual cycle, and those responses can provide insight into potential impacts that environmental changes may have on these species. To understand year‐round variation in space use by Ferruginous Hawks Buteo regalis, we tracked 12 birds breeding in southwestern Idaho, USA, using GPS telemetry collected over 207 bird‐months. Home‐range sizes of territorial adult hawks showed strong intra‐annual variation, being smallest from April to June and largest from July to October. In contrast, juvenile birds (< 2 years old) did not appear to hold territories and showed no detectable intra‐annual variation in ranging behaviour. Association with land‐cover types by territorial birds varied between breeding and non‐breeding months and was linked to home‐range size. Home‐range sizes of non‐territorial birds were larger than those of territorial birds, and that size did not vary across the year. Association with anthropogenic habitats (irrigated cropland habitats that can provide high rodent densities and increased foraging opportunities) was negatively associated with home‐range size in months of the non‐breeding season. Unexpectedly, the opposite was true in the months of the breeding season, such that use of croplands resulted in larger home‐ranges. Patterns in home‐range size were probably linked to intrinsic factors such as the timing of breeding and migratory behaviour, and to extrinsic factors such as prey availability associated with specific land‐cover types. These results have implications for our understanding of the response of Ferruginous Hawks and other similar species to predicted changes in land cover, and they suggest unexpected relationships between human activity and wildlife behaviour. Furthermore, because the birds we tracked used a large portion of western North America, they are probably relevant far beyond the small area where these individuals were trapped.

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Biovectoring of plastic by white storks from a landfill to a complex of salt ponds and marshes

Cano-Povedano,

López-Calderón,

Sánchez

et al. 2023

Marine Pollution Bulletin

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Anthropogenic food subsidies reshape the migratory behaviour of a long-distance migrant

Cited by 4 publications

References 51 publications

Fitness, behavioral, and energetic trade‐offs of different migratory strategies in a partially migratory species

Fitness, behavioral, and energetic trade‐offs of different migratory strategies in a partially migratory species

Ferruginous Hawk movements respond predictably to intra‐annual variation but unexpectedly to anthropogenic habitats

Biovectoring of plastic by white storks from a landfill to a complex of salt ponds and marshes

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