Ecological drivers of variation in the extent of the post‐fledging dependence period in the largest group of diurnal raptors

Ibis, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

The post‐fledging dependence period (PFDP) is a fundamental stage in the life cycle of altricial birds that influences their long‐term survival and fitness. However, research on duration this raptors, factors affecting it, scarce. We performed first literature review length PFDP Accipitridae, largest family among diurnal meta‐analysis examining effects breeding latitude hemisphere, body weight migratory status, controlling for species phylogeny. Hypotheses were tested at levels both populations. known less than half Accipitridae species, with no data two‐thirds threatened near‐threatened species. Larger individuals lower latitudes showed longer PFDP, as did non‐migrants southern‐hemisphere breeders. effect was more marked larger resident populations This extended tropical raptors may promote juvenile survival. Migration timing continentality northern hemisphere constrain PFDP. These findings highlight importance encouraging study key, but poorly known, life‐cycle raptors.

Language: Английский

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Undergoing climate change, how safe the wintering habitats of Eurasian vultures would remain: habitat modelling study in northern India

Journal of Ornithology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 4, 2024

Language: Английский

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A Picky Predator and Its Prey: How Snow Conditions and Ptarmigan Abundance Impact Gyrfalcon Feeding Behaviour and Breeding Success

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(4)

Published: April 1, 2025

ABSTRACT Species interactions can be altered by climate change but also mediate its effects. The gyrfalcon ( Falco rusticolus ) and the ptarmigan Lagopus spp.) form a predator–prey couple that reflects dynamics of boreal, tundra, alpine ecosystems. To determine how may impact food web, we investigated abundance local weather diet feeding behaviour, nest occupancy, reproductive success. Using wildlife cameras, monitored nests throughout nestling period to collect data on behaviour. We quantified gyrfalcon's functional response describing kill rates relate density. Additionally, numerical demographic aggregative success respectively, were related density, using from large‐scale monitoring projects. Ptarmigan dominant prey species, representing 98% diet. proportion in breeding increased springs with more snow, decreased snow during period. Gyrfalcon was positively occupancy rate not These results indicate effect is straightforward, investigating (a)biotic factors both predator relevant predicting will respond change. Following current predictions, spring occur earlier, which food‐web structure through availability diversity other species. This requires adaptations gyrfalcons predators. emphasise predators species accurately evaluated multi‐species level rather than individually.

Language: Английский

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Future habitat suitability and population status of two critically endangered resident Gyps vultures in a northern Indian state predicted through modelling

Earth history and biodiversity., Journal Year: 2025, Volume and Issue: unknown, P. 100025 - 100025

Published: April 1, 2025

Language: Английский

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Maximum Entropy Analysis of Bird Diversity and Environmental Variables in Nanjing Megapolis, China

Sustainability, Journal Year: 2024, Volume and Issue: 16(5), P. 2139 - 2139

Published: March 5, 2024

Against the background of global climate change and urbanization, biodiversity birds is facing unprecedented threats. In this paper, taking Nanjing megapolis as an example, based on distribution sites 79 bird species 17 environmental variables, MaxEnt model was used to simulate diversity, most important variables were analyzed. The results show that (1) suitable for simulation potential diversity in megapolis; (2) areas with highest mainly distributed mountains hills where forests are located; (3) five affecting ranked maximum temperature warmest month (MTWM) > Digital Elevation Model (DEM) precipitation wettest (PWM) distance nearest forest (DF) Fractional Vegetation Cover index (FVC), MTWM, PWM, DF being negatively correlated whereas FVC DEM exhibited positive correlations diversity; (4) contribution rates three types follows: habitat meteorological disturbance variables. Sufficient habitats should be maintained cities, disturbances from human activities reduced achieve harmonious coexistence humans animals context thereby promoting sustainable development.

Language: Английский

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Long‐term conservation efforts at flyway scale can halt the population decline in a globally endangered migratory raptor

Animal Conservation, Journal Year: 2023, Volume and Issue: 27(3), P. 374 - 385

Published: Nov. 20, 2023

Abstract Many threatened species require ongoing management, which is often funded through short project cycles. Evaluating whether the management effective in protecting a important to inform future investments. For migratory species, may affect only part of species' annual cycle, and reversing population decline challenging achieve demonstrate. Here, we evaluate conservation projects by European LIFE programme safeguard vulture achieved their major objective stabilizing target breeding population. Between 2012 2022, an international alliance organizations implemented multiple actions reduce poisoning, direct persecution, electrocution collision with power lines along Eastern Mediterranean flyway. We monitored territories Balkan globally endangered Egyptian Vulture Neophron percnopterus between 2006 tracked 60 young birds GPS transmitters since 2010. used these data examine growth rate survival probability had increased implementation. The mean adult territorial 1.9% 2014 from 0.937 0.955, monthly wild juvenile 9.7% 0.833 0.914 2018. across Balkans 6.9% 0.939 before 2018 1.005 This indicates that has remained stable for past 5 years (2018–2022), but at size half (105 2022) than beginning time series (204 2006). caution flyway reinforcement are required ensure on can recover, show flyway‐scale collaboration have lasting benefits species.

Language: Английский

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Evidence of Continuing Downward Trends in American Kestrel Populations and Recommendations for Research into Causal Factors

Journal of Raptor Research, Journal Year: 2023, Volume and Issue: 57(2)

Published: April 19, 2023

Analizamos conjuntos de datos largo plazo provenientes programas cajas nido, censos aves reproductoras realizados por el Servicio Geológico EEUU, conteos navideños la Sociedad Nacional Audubon y dos sitios clave observación migración otoño, Hawk Mountain Sanctuary Cape May Hawkwatch. Encontramos que las poblaciones Falco sparverius en América del Norte general siguen disminuyendo, aunque con algunas salvedades. Algunas realidad están aumentando, mientras otras se mantienen estables. En general, magnitud cambio anual parece estar disminuyendo ligeramente durante los últimos años. Para comprender causas potenciales disminución, recomendamos siguientes cursos acción sin un orden particular: (1) determinar si aumento Accipiter cooperii está afectando F. al restringir su distribución mera presencia; (2) estudiar efectos pérdida y/o degradación hábitat rango invernada sparverius; (3) seguir investigando una escala espacial más amplia alteraciones dentro temporada creando trampas ecológicas para individuos reproductivos (4) importancia artrópodos dieta sparverius, especialmente tendencias poblacionales a momento aparición saltamontes relación cronología reproductiva; (5) descubrir rodenticidas plantean riesgo grave Norte; (6) aprender sobre posibles efectos, tanto directos como indirectos, uso neonicotinoides puede tener esta especie; (7) continuar estudios curso efecto climático estas aves. [Traducción equipo editorial]

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Barn Owls as a Nature-Based Solution for Pest Control: A Multinational Initiative Around the Mediterranean and Other Regions

Conservation, Journal Year: 2024, Volume and Issue: 4(4), P. 627 - 656

Published: Nov. 4, 2024

Pest rodents cause extensive damage to crops worldwide. Up 40% of global crop production is lost annually pests and diseases, with accounting for 15–30% this loss amounting billions dollars each year. The current method controlling rodent populations involves the use chemical rodenticides. While effective in short term, these chemicals pose serious environmental health risks, leading secondary poisoning non-target species other long-term negative ecological consequences, underscoring need adopt more sustainable pest-control measures. Nature-Based Solutions (NbSs), on hand, are increasingly recognized addressing challenges such as climate change, biodiversity loss, development, they include actions that protect, sustainably manage, restore ecosystems. In context, Barn Owls (Tyto alba) highly a natural pest-rodent control agents agro-ecosystems. has wide distribution adaptability various environments, its diet consists predominantly small mammals, making up from 50–60% even 90–95% according different geographical regions. Each Owl family can consume thousands annually, creating high potential reduce infestations. Deploying nest boxes agricultural areas significantly increase populations, ensuring continuous control. Limitations solution must also be taken into consideration predation mammals not pests, possible competition nocturnal birds prey. Ιn paper, we aim introduce concept owls NbS pest outline main challenges, pitfalls, advantages, disadvantages implementing new region, all necessary in-between steps (scientific, societal, administrative, educational) have followed successful implementation. So far, several countries successfully implemented box schemes, Israel Cyprus achieving reduction pesticides by 45% 58%, respectively, whereas project spreading Mediterranean (Jordan, Palestine Authority, Greece, Morocco, Spain), palm plantations Malaysia USA, vineyards Napa Valley California. success programs relies integrating scientific research, societal needs, supportive policy frameworks, education. both bottom-up top-down initiatives, participation farmers local communities establish deploy solution. Continuous research explore systematically owl trophic ecology, foraging breeding interactions landscape, land uses temporal spatial scales, habitat suitability, availability nesting sites, regional conditions addressed.

Language: Английский

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Power line density and habitat quality: key factors in Canarian houbara bustard decline

Bird Conservation International, Journal Year: 2024, Volume and Issue: 34

Published: Jan. 1, 2024

Summary Species’ declines are caused by a combination of factors that affect survival and/or breeding success. We studied the effects set environmental and anthropogenic variables on disappearance Canarian Houbara Bustards Chlamydotis undulata fuertaventurae Fuerteventura (Canary Islands), once main stronghold this endangered bird. Of 83 male display sites detected in 1997–1998, only 29 remained occupied 2020–2021 (a 65% decrease 23 years). compared habitat quality, density conspecifics, other steppe birds crows, presence human infrastructure, degree protection between these extant 54 extinct using univariate analyses generalised linear models (GLMs). The most influential variable abandonment was Normalised Difference Vegetation Index (NDVI), an indicator green vegetation productivity, which suggests strong effect aridification due to climate change population’s extinction process. Powerline second important factor. This houbaras have survived where greater abundance food resources has enabled higher success, powerline fatalities lower mortality over years. Higher densities houbaras, crows at confirmed better quality areas. Extant sites, located generally protected areas, also had infrastructure (e.g. buildings, roads). discuss conservation implications results provide management recommendations for subspecies.

Language: Английский

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Trends in the global trade of live CITES-listed raptors: Trade volumes, spatiotemporal dynamics and conservation implications

Biological Conservation, Journal Year: 2023, Volume and Issue: 284, P. 110216 - 110216

Published: July 29, 2023

The global legal wildlife trade is worth US$4–20 billion to the world's economy every year. Raptors frequently enter for use as display animals, by falconers or hobbyists sport and recreation. Using data from Convention on International Trade in Endangered Species of Wild Fauna Flora's (CITES) Database, we examined trends global, commercial CITES-listed raptors between 1975 2020. Overall 272 species were traded, totalling 188,149 traded individuals, which increased over time. Hybrid Falcons (N = 50,366) most commonly comprising more than a third diurnal raptor trade, followed Gyrfalcons (Falco rusticolus; N 30,510), Saker (F. cherrug; 21,679), Peregrine peregrinus; 13,390) Northern White-faced Owls (Ptilopsis leucotis; 6725). More half wild-caught classified globally threatened. United Kingdom was largest exporter live Arab Emirates importer. Countries with higher GDPs (US$) imported those smaller GDPs. Larger-bodied relative smaller-bodied conspecifics. Following introduction European Union's Bird Ban 2005, number declined. Despite its limitations, CITES Database provides an important baseline raptors. However, better understanding illegal networks smuggling routes, both on-the-ground online, are essential future conservation efforts.

Language: Английский

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