To breed or not to breed: Territory occupancy is predicted by reproductive performance and habitat heterogeneity DOI Creative Commons
Andrés López‐Peinado, Navinder J. Singh, Vicente Uríos

et al.

Ecological Applications, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 10, 2024

Abstract Species life history and anthropogenic influence are important drivers of population performance viability in human‐dominated ecosystems. How these factors affect habitat selection occupancy long‐lived species is an topic for their conservation. Long‐term datasets needed establishing the underlying this process. In 22 year‐long study, we conducted annual surveys Bonelli's eagle east Iberian Peninsula. During period, 42.8% known territories remained unoccupied. Territories with a higher likelihood raising two chicks over time were stable, evidenced by lower coefficient variation productivity, more likely to remain occupied. Moreover, diversity, dominated coniferous forest or agricultural fields, those located further away from coast at altitudes showed rates (i.e., unoccupied >3 consecutive years). To validate associations, monitored space use individuals equipped Global Positioning System/Global System Mobile (GPS/GSM) transmitters, which confirmed that eagles selected open habitats (mainly scrublands transitional woodland‐scrubs) intermixed areas within home ranges. contrast, avoided agricultural, urban, continuous forests breeding line observations territories. Our results highlight interplay between natural factors, also have implications other raptor species. Preservation most productive re‐occupancy along reducing threats preferred fundamental actions should be taken immediately sustain viable populations. Potential management include enhancing prey density through restoration conservation, mitigating mortality risks due power lines, fences, poisoning, maintaining heterogeneity eagles' hunting activities.

Language: Английский

Differential Flight Responses of Sympatric Raptor Species to Weather Conditions and Extreme Temperature Events DOI Creative Commons
Lara Naves‐Alegre,

Hernán García‐Mayoral,

Jon Morant

et al.

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(2)

Published: Feb. 1, 2025

ABSTRACT Climate change has increased the frequency, severity, and duration of extreme weather events, for example, heatwaves, underscoring need to comprehend their impact on animal behavior. Flying organisms, particularly birds, are greatly affected by changes in atmospheric conditions may modify speed or direction, adjust flight strategy, even make decisions whether fly based weather. In this study, we assessed flight‐related parameters three GPS‐tagged raptor species: golden eagle ( Aquila chrysaetos ), Bonelli's fasciata Spanish adalberti relation heatwaves. The results showed that species varied patterns despite similar environmental conditions, including temperature, precipitation, wind speed, pressure. Each exhibited unique strategies responsiveness reflecting diverse adaptive capacities behavioral flexibilities. Specifically, displayed comparatively minor adjustments its strategy during periods contrasting with pronounced variations observed eagle. These findings suggest unpredictable differently. An understanding how events individual fitness, through modifications energy expenditure foraging practices, is essential predicting potential long‐term population dynamics.

Language: Английский

Citations

0
Modelling growth rates and developing an age determination tool for nestling Bonelli's Eagle Aquila fasciata DOI Creative Commons

Savvas Iezekiel,

Jakub Z. Kosicki, Reuven Yosef

et al.

Annals of Applied Biology, Journal Year: 2025, Volume and Issue: unknown

Published: March 13, 2025

Abstract Understanding the growth rate of nestlings is essential for explaining developmental strategies and particularly important birds prey. Given that they have lower reproduction rates than other species, could be one critical factors determining parental fitness influencing individual's condition. Despite variability often resulting from various stress conditions, predictable given ages nestlings, as highlighted here. This study investigates dynamics Bonelli's Eagle ( Aquila fasciata ) in Republic Cyprus, focusing on 13 biometric variables measured over time. We employed logistic generalized additive models to analyse trajectories identify predictors age. Our findings highlight achieve maximum body mass tarsus length early development, followed by primary feathers wing length. Conversely, head width, beak dimensions, talon exhibit slower more gradual growth. Precisely describing pattern individual components enabled us develop a tool predicting found wing, tarsus, middle lengths are most reliable nestling The effectiveness test our predictive model conducted an independent data set showed age estimation error 1 day. Thus, research provides deep insight into eagles’ patterns while offering practical tools field studies conservation efforts.

Language: Английский

Citations

0
Both movements and breeding performance are affected by individual experience in the Bonelli's eagle Aquila fasciata DOI Creative Commons
Lise Viollat, Alexandre Millon,

Cécile Ponchon

et al.

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(7)

Published: July 1, 2024

Movement is a key behaviour to better understand how individuals respond their environment. behaviours are affected by both extrinsic factors that face, such as weather conditions, and intrinsic factors, sex experience. Because of the energy costs it entails, movement can have direct consequences on an individual's demographic parameters-and ultimately population dynamics. However, relationship between daily parameters breeding performance poorly known, in particular for central place forager territorial species. We investigated here link French Bonelli's eagle (

Language: Английский

Citations

3
A comprehensive analysis of spatial and temporal patterns of anthropogenic adult mortality of Bonelli's eagles in eastern Spain DOI Creative Commons
Andrés López‐Peinado, Vicente Uríos, Pascual López‐López

et al.

Journal of Wildlife Management, Journal Year: 2024, Volume and Issue: 88(8)

Published: Aug. 1, 2024

Abstract In eastern Spain, Bonelli's eagle ( Aquila fasciata ) abundance has declined almost 50% in the last 25 years and, consequently, species is listed as regionally endangered. Therefore, aim of this study to report mortality causes territorial breeding eagles, including spatial and temporal patterns, assess effects on population dynamics. From 2015–2023, we tracked 60 eagles via global positioning system‐global system for mobile communications (GPS‐GSM) telemetry; 33 died (median survival time = 1,519 days). Survival did not differ relation sex, age at capture (subadult vs. adult birds), site (coastland inland territories), or transmitter's model. One‐year probability (95% CI) was 0.716 (0.607–0.845); 2‐year 0.640 (0.524–0.781); 3‐year 0.581 (0.464–0.729). Anthropogenic (66.7% cases) prevailed over natural (27.3%) unknown (6.0%). Causes were intra‐ interspecific predation (24.2% cases), electrocution (18.2%), poisoning (15.1%), collision with power lines (9.1%), shooting drowning other man‐made infrastructure (6.1%), disease (3.0%). Deaths most frequent during early season. Only 2 (6.1%) deaths recorded occurred within a protected area. Natural more away from Mediterranean coast. contrast, anthropogenic near coast, where human density high. We estimated that extirpation our area 17.8% next 50 99.2% 100 years. Nonetheless, small reduction by ≥15% could prevent actions reduce are urgently needed preserve Spain.

Language: Английский

Citations

2
A new view of territoriality in large eagles: the territory pre‐exists regardless of their occupants DOI Creative Commons
Sara Morollón, Pascual López‐López, Vicente Uríos

et al.

Journal of Zoology, Journal Year: 2024, Volume and Issue: 323(3), P. 177 - 186

Published: May 6, 2024

Abstract Knowledge of vertebrate territoriality and spatial use is a topic great interest in the study animal behaviour conservation biology. Investigating plasticity territory boundaries, shape territories how can be modified depending on their owners important to deepen our knowledge territorial species. We analysed variation tested similarity distribution area individuals from same between 2015 2021, using data 51 Bonelli's eagles ( Aquila fasciata ) 22 different territories, tagged with GPS/GSM transmitters eastern Spain. calculated percentage overlap individual years 95% kernel density estimator. also changes size following replacement either by single or whole pair. Our results show that retain extent regardless occupying members, boundaries change little over time. Identifying maintaining large eagle owners, therefore key ensuring long‐term recovery these threatened

Language: Английский

Citations

1
To breed or not to breed: Territory occupancy is predicted by reproductive performance and habitat heterogeneity DOI Creative Commons
Andrés López‐Peinado, Navinder J. Singh, Vicente Uríos

et al.

Ecological Applications, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 10, 2024

Abstract Species life history and anthropogenic influence are important drivers of population performance viability in human‐dominated ecosystems. How these factors affect habitat selection occupancy long‐lived species is an topic for their conservation. Long‐term datasets needed establishing the underlying this process. In 22 year‐long study, we conducted annual surveys Bonelli's eagle east Iberian Peninsula. During period, 42.8% known territories remained unoccupied. Territories with a higher likelihood raising two chicks over time were stable, evidenced by lower coefficient variation productivity, more likely to remain occupied. Moreover, diversity, dominated coniferous forest or agricultural fields, those located further away from coast at altitudes showed rates (i.e., unoccupied >3 consecutive years). To validate associations, monitored space use individuals equipped Global Positioning System/Global System Mobile (GPS/GSM) transmitters, which confirmed that eagles selected open habitats (mainly scrublands transitional woodland‐scrubs) intermixed areas within home ranges. contrast, avoided agricultural, urban, continuous forests breeding line observations territories. Our results highlight interplay between natural factors, also have implications other raptor species. Preservation most productive re‐occupancy along reducing threats preferred fundamental actions should be taken immediately sustain viable populations. Potential management include enhancing prey density through restoration conservation, mitigating mortality risks due power lines, fences, poisoning, maintaining heterogeneity eagles' hunting activities.

Language: Английский

Citations

0