Seasonal variation in the foraging behavior of neotropical tyrant flycatchers (Tyrannidae) in a Cerrado fragment, Brazil

Ferrari, Andréa; Motta-Junior, José Carlos; Siqueira, José de Oliveira

doi:10.1080/03949370.2022.2026480

“…Known aspects of the ecology of the Cock-tailed Tyrant could help to explain finer-scale patterns of habitat selection. Cock-tailed Tyrant are aerial insectivores that primarily hawk or sally for arthropods from the herbaceous stratum [73]. During breeding, males gather to demonstrate elaborate aerial displays to groups of females, with cup nests built on the ground to accommodate offspring [59,74].…”

Section: Discussionmentioning

confidence: 99%

Habitat Selection of Three Neotropical Grassland Birds Is Dependent on Vegetation Structure and Resources

Peacock,

Macleod,

Davies

et al. 2024

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Grassland birds are globally imperiled. Those of endemic Neotropical savannas may be particularly threatened as knowledge of the ecology of many species is lacking, restricting our ability to take decisive conservation action. During the dry (non-breeding) season of 2010, we studied the population size, distribution, and habitat associations of the Cock-tailed Tyrant (Alectrurus tricolor), Black-masked Finch (Coryphaspiza melanotis), and Wedge-tailed Grass-finch (Emberiziodes herbicola) across a disturbance-mediated savanna–grassland gradient in Beni, Bolivia. We used distance sampling and surveyed structural and resource-specific habitat features at plots where birds were present versus random locations. Occupancy models identified fine-scale habitat associations. Cock-tailed Tyrant (7.1 ind./km2) specialized on open habitats in areas expected to be heavily inundated in the wet season, avoided trees, and selected tall grassy swards. Black-masked Finch (25.1 ind./km2) occurred across the gradient, associating with tall, forb-rich swards, sparse shrubs, and low levels of fruiting and seeding vegetation. Wedge-tailed Grass-finch (27.9 ind./km2) also occurred across the gradient, particularly associated with tall, forb-rich swards, abundant seeding grasses, and sparse shrubs. Our results offer the first quantitative abundance estimates for these species in Beni, provide vital baselines for future monitoring, and improve knowledge of the ecology and conservation management needs of these species. Importantly, our results suggest that populations of these three grassland birds may be best maintained in heterogenous, mosaic landscapes that can be produced by carefully managed burning and grazing. Further research in the breeding season would facilitate making stronger, more specific management recommendations.

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“…Although common in many areas, its biology is poorly known (see Farnsworth & Langham 2020), and knowledge of breeding is confined to a few reports, mainly by Buzzetti & Silva (2008), Lombardi et al (2010) and Lopes et al (2013). The species' foraging behaviour has been described in detail recently (Ferrari et al 2023), but dietary data remain scarce, with the most accurate information reports of stomach contents by Moojen et al (1941) and Schubart et al (1965). As a species that vocalises unpredictably after long intervals of silence, there are few recordings available in publicly accessible databases, and its vocal repertoire and functions are still incompletely known.…”

Section: Discussionmentioning

confidence: 99%

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2024

Bulletin of the British Ornithologists’ Club

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Forthcoming MeetingThe next meeting of the Club will be held on Monday 25 March at 6.30pm (doors open at 6pm) upstairs in the Barley Mow, 104 Horseferry Road, London SW1P 2EE. Laura Vaughan-Hirsh will talk on The White Stork nesting in Sussex.The landscape in a small but expanding part the Low Weald in Sussex has changed for the better over the last decade. Laura Vaughan-Hirsch's talk will explain how White Storks Ciconia ciconia are part of this change, with optimism for biodiversity rather than the gloom so commonplace. On the Knepp Estate a bold transition from arable and dairy farming to a new landscape with a mosaic of unfenced fields grazed of Longhorn cattle, Exmoor ponies, Tamworth pigs and native deer. What has not changed is the Sussex marl and flood waters that come with heavy rains, a constant reminder that this was never going to be agricultural land with larger fields of well-drained loamy soil. Research suggests that the ecological requirements for White Storks seem to be the same everywhere, namely open, little wooded and somewhat wet land such as valleys of rivers and streams, cultivated fields, pastures and meadows, provided that they are not too dry or too much drained. On the Knepp Estate there is an aim to promote greater engagement between the public and wildlife in the countryside, so the highly visible and charismatic White Stork, with its history of nesting in close association with man, was an obvious first-choice addition. The talk will address the life cycle of the species in Sussex and the challenges faced by the birds and their fledglings.

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“…Although common in many areas, its biology is poorly known (see Farnsworth & Langham 2020), and knowledge of breeding is confined to a few reports, mainly by Buzzetti & Silva (2008), Lombardi et al (2010) and Lopes et al (2013). The species' foraging behaviour has been described in detail recently (Ferrari et al 2023), but dietary data remain scarce, with the most accurate information reports of stomach contents by Moojen et al (1941) and Schubart et al (1965). As a species that vocalises unpredictably after long intervals of silence, there are few recordings available in publicly accessible databases, and its vocal repertoire and functions are still incompletely known.…”

mentioning

confidence: 99%

Breeding biology, diet and vocal repertoire of White-rumped Monjita Xolmis velatus

Araujo Gussoni,,

Tinti,

Gomes

et al. 2024

Bulletin of the British Ornithologists’ Club

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Seasonal variation in the foraging behavior of neotropical tyrant flycatchers (Tyrannidae) in a Cerrado fragment, Brazil

Cited by 4 publications

References 42 publications

Habitat Selection of Three Neotropical Grassland Birds Is Dependent on Vegetation Structure and Resources

Habitat Selection of Three Neotropical Grassland Birds Is Dependent on Vegetation Structure and Resources

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Breeding biology, diet and vocal repertoire of White-rumped Monjita Xolmis velatus

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