Central Chile comprises a previously unknown nonbreeding area for the migratory population of Turkey Vulture ( Cathartes aura ruficollis ) breeding in the northwestern Argentine Patagonia

Emu - Austral Ornithology, Journal Year: 2024, Volume and Issue: 124(2), P. 206 - 210

Published: Feb. 28, 2024

Bird migration in the Neotropics is complex and highly diverse. Indeed, for many taxa, basic questions such as where they go are still relevant. Satellite-tracking studies of Turkey Vulture (Cathartes aura) have revealed extensive variability their movement strategies, contributing to widespread distribution. However, South American migratory populations among least explored. By integrating five years satellite-tracking data, citizen science databases classical raptor monitoring techniques, we present a case study reporting hitherto unknown nonbreeding area subspecies ruficollis. Specifically, document that minor proportion population breeds northwestern Argentine Patagonia migrates northwards central Chile at beginning austral autumn. Our findings improve our knowledge within establish baseline strategies ruficollis breeding high latitudes America.

Language: Английский

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Territoriality, breeding philopatry, and nest site selection of Chestnut Seedeater ( Sporophila cinnamomea ) in grasslands of southern Brazil

Journal of Field Ornithology, Journal Year: 2024, Volume and Issue: 95(3)

Published: Jan. 1, 2024

We provide the first insights on territorial behavior of Chestnut Seedeater (Sporophila cinnamomea), a vulnerable, migratory species inhabiting Pampas grasslands South America. Our study aims to describe and estimate territory size, calculate rates philopatry breeding dispersal, main aspects species' behavior, characterize nest sites. Over four seasons (2018–2022), we monitored 70 adult individuals across two grassland areas southern Brazil. applied Kernel Density Estimation method size core analyzed composition floristic structure The average territories was 1.91 ± 0.59 ha, were 0.23 0.05 ha. Remarkably, philopatric males did not significantly vary in consecutive seasons. rate 51.5%. Moreover, observed no significant differences dispersion distance among seasons, suggesting stable site fidelity. Analysis sites identified 14 plant exhibiting higher abundance, with dense tall vegetation prevalent. These findings underscore importance understanding population dynamics within as initial steps toward developing effective management conservation strategies for their habitats.

Language: Английский

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Tracking Small Animals in Complex Landscapes: A Comparison of Localisation Workflows for Automated Radio Telemetry Systems

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(10)

Published: Oct. 1, 2024

ABSTRACT Automated radio telemetry systems (ARTS) have the potential to revolutionise our understanding of animal movement by providing a near‐continuous record individual locations in wild. However, localisation errors ARTS data can be very high, especially natural landscapes with complex vegetation structure and topography. This curtails research questions that may addressed this technology. We set up an grid valley heterogeneous cover Colombian high Andes applied analytical pipeline test effectiveness methods. performed calibration trials simulate high‐ or low‐flight, walking on ground, compared workflows varying decisions related signal cleaning, selection, smoothing, interpretation, along four multilateration approaches. also quantified influence spatial features system's accuracy. Results showed large variation error, ranging between 0.4–43.4 m 474–1929 m, depending method used. found selection higher strengths smoothing based temporal autocorrelation are useful tools improve Moreover, terrain ruggedness, height movement, type, location animals inside outside area error. In case study system, thousands points were successfully estimated for two high‐altitude hummingbird species previously lacked data. Our hummingbirds suggests grids used estimate small animals' home ranges, associations types, seasonality occurrence. present comparative pipeline, highlighting variety possible while processing Overall, provides guidance resolution estimates, broadening application tracking technology ecology wild populations.

Language: Английский

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The underlying causes of differential migration: assumptions, hypotheses, and predictions

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 10, 2024

Mechanisms governing the migratory decisions of birds have long fascinated ecologists and sparked considerable debate. Identifying factors responsible for variation in migration distance, also known as differential migration, has been a popular approach to understanding mechanisms underlying behaviour more generally. However, research progress slowed by continued testing overlapping, non-mechanistic, circular predictions among small set historically entrenched hypotheses. We highlight body size hypothesis suggest that commonly tested impeded because relationships with distance are made several distinct hypotheses contrasting mechanisms. The cost itself not adequately accounted most hypotheses, we propose two flight efficiency time- energy-minimizing allow individuals mitigate risks inherent longer migrations. advance conceptual versions social dominance based on related minimization food maximization will help clarify role competition driving decisions. Overall, describe refine 12 mechanistic proposed explain (along other special-case hypotheses), seven which limitation past identified this be an important driver migration. thoroughly reviewed 145 publications assess amount support 10 critical assumptions alternative birds. Our review reveals surprisingly few studies explicitly evaluate within context. Generating strong improve our ability differentiate these explanations Additionally, future intraspecific greatest if investigators continue focus rather than demographic classes, previous found differing classes. Interspecifically, thorough comparative analysis seeks species would broaden both regulating current patterns those led evolution Collectively, provide framework that, together advances animal-borne tracking technology, can used causes

Language: Английский

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Urban green spaces with high connectivity and complex vegetation promote occupancy and richness of birds in a tropical megacity

Urban Ecosystems, Journal Year: 2024, Volume and Issue: 28(1), P. 1 - 18

Published: Oct. 17, 2024

Abstract Urban growth often leads to land-use changes that result in biodiversity loss and reduced human benefits. In urban zones, green areas facilitate physicochemical processes (such as carbon capture, reducing environmental temperature noise pollution), offer multiple benefits beings (e.g., water filtration purification), support numerous vertebrate populations, including birds. the tropics, capacity of spaces maintain bird populations is regulated by characteristics these vegetation structure) seasonality. order generate ecological knowledge help conserve diversity large settlements, this study aimed (1) identify most influential variables on distribution species a tropical megacity, (2) assess how richness varies between dry rainy seasons. Across two seasons 2021 2022, detection records 108 were obtained from 101 areas. Air sampling time primary factors influencing detection. Bird occupancy higher parks near other first increased with tree during Floral abundance explained second season. 2021, highest was observed season, while estimated These findings highlight importance resource availability spatial arrangement for diversity, offering insights conservation maintaining ecosystem environments.

Language: Английский

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