Demographic impact of landfill closure on a resident opportunistic gull

Delgado, Sergio; Herrero, Alfredo; Galarza, Aitor; Aldalur, Asier; Zorrozua, Nere; Arizaga, Juan

doi:10.1002/1438-390x.12083

Cited by 10 publications

(13 citation statements)

References 43 publications

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“…For our dataset, dividing the data into shorter resighting periods, like a month, would have led to an overly complex model with little power to provide precise estimates. As our survival estimates are close to those obtained in other independent studies [ 23 , 25 , 32 , 59 , 65 ], we are confident that our results are generally robust. To evaluate this issue more completely, a mark-recapture dataset with more resighting data is required so that models can be run at shorter time intervals.…”

Section: Discussionsupporting

confidence: 90%

“…Regional differences in survival could be explained by resource variation around the breeding sites. For example, it has been shown that landfill closures can impact YLG population demographics via their effect on juvenile survival [ 59 ]. It is possible that there was a reduction in accessible garbage around Marseille/Hyères during the study period which forced individuals to migrate further, particularly if alternative food sources were not readily available.…”

Section: Discussionmentioning

confidence: 99%

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Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

et al. 2023

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Background As for other life history traits, variation occurs in movement patterns with important impacts on population demography and community interactions. Individuals can show variation in the extent of seasonal movement (or migration) or can change migratory routes among years. Internal factors, such as age or body condition, may strongly influence changes in movement patterns. Indeed, young individuals often tend to move across larger spatial scales compared to adults, but relatively few studies have investigated the proximate and ultimate factors driving such variation. This is particularly the case for seabirds in which the sub-adult period is long and difficult to follow. Here, we examine migration variation and the factors that affect it in a common Mediterranean seabird, the Yellow-legged gull (Larus michahellis). Methods The data include the encounter histories of 5158 birds marked as fledglings between 1999 and 2004 at 14 different colonies in southern France and resighted over 10 years. Using a multi-event mark-recapture modeling framework, we use these data to estimate the probability of movement and survival, taking into account recapture heterogeneity and age. Results In accordance with previous studies, we find that young individuals have greater mobility than older individuals. However, the spatial extent of juvenile movements depends on natal colony location, with a strong difference in the proportion of sedentary individuals among colonies less than 50 km apart. Colony quality or local population dynamics may explain these differences. Indeed, young birds from colonies with strong juvenile survival probabilities (~ 0.75) appear to be more sedentary than those from colonies with low survival probabilities (~ 0.36). Conclusions This study shows the importance of studying individuals of different ages and from different colonies when trying to understand seabird movement strategies. Local breeding success and the availability of food resources may explain part of the among colony differences we observe and require explicit testing. We discuss our results with respect to the feedback loop that may occur between breeding success and mobility, and its potential implications for population demography and the dissemination of avian disease at different spatial scales.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Regional differences in survival could be explained by resource variation around the breeding sites. For example, it has been shown that land ll closures can impact YLG population demographics via their effect on juvenile survival [55]. It is possible that there was a reduction in accessible garbage around Marseille/Hyères during the study period which forced individuals to migrate further, particularly if alternative food sources were not readily available.…”

Section: Discussionmentioning

confidence: 99%

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Souc

Sadoul²,

Blanchon³

et al. 2022

Preprint

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Background: As for other life history traits, variation occurs in movement patterns with important impacts on population demography and community interactions. Individuals can show variation in the extent of seasonal movement patterns (or migration) or can change migratory routes among years. Internal factors, such as age or body condition, may strongly influence changes in movement patterns. Indeed, young individuals often tend to move across larger spatial scales compared to adults, but relatively few studies have investigated the proximate and ultimate factors driving such variation. This is particularly the case for seabirds in which the sub-adult period is long and difficult to follow. Here, we examine migration variation and the factors that affect it in a common Mediterranean seabird, the Yellow-legged Gull (Larus michahellis). Methods: The data included the encounter histories of 5158 birds marked as fledglings between 1999 and 2004 at 14 different colonies in southern France and resighted over 10 years. Using a multi-event mark-recapture modeling framework, we used these data to estimate the probability of movement and survival, taking into account recapture heterogeneity and age. Results: In accordance with previous studies, we found that young individuals had greater mobility than older individuals. However, the spatial extent of juvenile movements depended on natal colony location, with a strong difference in the proportion of sedentary individuals between colonies less than 50 km apart. Colony quality or local population dynamics may explain these differences. Indeed, young birds from colonies with strong juvenile survival probabilities (~0.75) appeared to be more sedentary than those from colonies with low survival probabilities (~0.36). Conclusions: This study shows the importance of studying individuals of different ages and from different colonies when trying to understand seabird movement strategies. Local breeding success and the availability of food resources may explain part of the among colony differences we observed and require explicit testing. We discuss our results with respect to the feedback loop that may occur between breeding success and mobility, and its potential implications for population demography and the dissemination of avian disease at different spatial scales.

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“…The conservation campaign in the following years and the White Stork's exploitation of landfills resulted in the rapid recovery of their breeding population in Western Europe (Schulz 1999, Tortosa et al 2002, Massemin-Challet et al 2006). Although many studies discuss the potential effects of change in waste management on species that rely on landfills (see references in Plaza and Lambertucci 2017), only a few have explored the effects of landfill closure, for example, on Yellow-legged Gull ( Larus michahellis ) (Payo-Payo et al 2015, Delgado et al 2021, Pinto et al 2021). In this species, the absence of landfills forced them to shift diet preferences but the scarcity in alternative feeding sources negatively impacted their population dynamics (Steigerwald et al 2015, Zorrozua et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Drastic reduction of the population distribution of White Storks predicted in absence of landfills

López‐García

Gil‐Tapetado

Aguirre

2023

Ornithological Applications

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Organic waste production has greatly increased following human sprawl and led to the development of landfills in recent decades. This abundant and reliable anthropogenic food source has favored several species, some of which consequently became overabundant. Landfills present hazards to wildlife, which may suffocate on plastic materials, tangle on cords, and get exposed to pollutants and pathogens. In response to environmental and public health concerns over the maintenance of landfills, the European Commission proposed to close the landfills. Our objective was to determine the impact of Landfill European Directive on the White Stork (Ciconia ciconia) whose population recovery and growth was linked to landfill exploitation. We implemented species distribution models to project future distribution in the absence of landfills in the Community of Madrid (Spain). Habitat suitability was estimated based on nest occurrence and we included data from land cover types, human population density, and two different climate change scenarios (i.e., emissions in low and high shared socioeconomic pathways). Given that protection measures, particularly implemented in protected areas, were associated with population recovery, we also evaluated the overlapping degree between protected areas and projected distribution. Our models predicted a sharp decline in breeding population distribution with landfill closure, reaching values similar to the 1984 breeding census when the species was categorized as threatened. Our results also suggest a decrease in maximum habitat suitability. Climate change also contributed to a reduction in breeding population distribution given model predictions for the extreme emission pathway (ssp5). Measures such as gradual change in landfill management, continuous monitoring of breeding populations, and evaluation of the White Stork use of natural feeding areas before and after landfill closure, should be considered.

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Demographic impact of landfill closure on a resident opportunistic gull

Cited by 10 publications

References 43 publications

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Natal colony influences age-specific movement patterns of the Yellow-legged gull (Larus michahellis)

Drastic reduction of the population distribution of White Storks predicted in absence of landfills

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