Preprints

Filtering by Subject: Ornithology

Neotropical Ornithology: Reckoning with historical assumptions, removing systemic barriers, and reimagining the future

Letícia Soares, Kristina Cockle, Ernesto Ruelas Inzunza, et al.

Published: 2022-04-22
Subjects: Animal Sciences, Life Sciences, Ornithology

A major barrier to advancing ornithology is the systemic exclusion of professionals from the Global South. A recent special dossier, Advances in Neotropical Ornithology, and a shortfalls analysis therein, unintentionally followed a long-standing pattern of highlighting individuals, knowledge, and views from the Global North, while largely omitting the perspectives of people based within the [...]

Microclimate shifts in nest-boxes and natural cavities before, during and after nesting

Joanna Sudyka, Irene Di Lecce, Marta Szulkin

Published: 2022-01-17
Subjects: Animal Sciences, Biodiversity, Biology, Ecology and Evolutionary Biology, Life Sciences, Ornithology, Physiology, Population Biology

Animals breeding in anthropogenic shelters such as nest-boxes experience nesting environment in which they did not originally evolve. Over the past decades, they are additionally challenged by climate change – a major environmental force influencing their reproductive ecology. Despite the central importance of nesting microclimate for offspring development and fitness, very little is known about [...]

Temporal patterns in prey size between sexes in a raptor with extreme size dimorphism: testing the intersexual competition hypothesis using web-sourced photographs

Connor T. Panter, arjun amar

Published: 2021-11-28
Subjects: Animal Sciences, Behavior and Ethology, Ecology and Evolutionary Biology, Evolution, Life Sciences, Ornithology, Zoology

In most vertebrates, males are larger than females. For raptors, sexual size dimorphism is reversed, with females being larger. Reversed sexual dimorphism (RSD) in raptors is strongly linked to diet, with species feeding on the most agile prey, for example bird-eating raptors, showing the greatest size differences between the sexes. Hypotheses for reversed sexual dimorphism (RSD) include the [...]

Causes and consequences of variation in early-life telomere length in a bird metapopulation

Michael Le Pepke, Thomas Kvalnes, Peter Sjolte Ranke, et al.

Published: 2021-10-17
Subjects: Animal Sciences, Biology, Ecology and Evolutionary Biology, Life Sciences, Ornithology, Physiology

1. Environmental conditions during early-life development can have lasting effects on individual quality and fitness. Telomere length (TL) may correlate with early-life conditions and may be an important mediator or biomarker of individual quality or pace-of-life, as periods of increased energy demands can increase telomere attrition due to oxidative stress. Thus, knowledge of the mechanisms that [...]

Matrix quality determines the strength of habitat loss filtering on bird communities at the landscape scale

Melina de Souza Leite, Andrea Larissa Boesing, Jean Paul Metzger, et al.

Published: 2021-09-20
Subjects: Animal Sciences, Biodiversity, Ecology and Evolutionary Biology, Life Sciences, Ornithology, Other Ecology and Evolutionary Biology, Terrestrial and Aquatic Ecology

Habitat loss represent a major threat to biodiversity, however, the modulation of their effects by the non-habitat matrix surrounding habitat patches is still undervalued. The landscape matrix might change community assembly in different ways. For example, low-quality matrices can accentuate environmental filtering by reducing resource availability and/or deteriorating abiotic conditions but they [...]

Nest-boxes alter the reproductive ecology of urban cavity-nesters in a species-dependent way

Joanna Sudyka, Irene Di Lecce, Lucyna Wojas, et al.

Published: 2021-08-25
Subjects: Animal Sciences, Biodiversity, Ecology and Evolutionary Biology, Life Sciences, Ornithology, Population Biology

To mitigate the shortage of natural breeding sites in cities, nest-boxes are provided for cavity-nesters. However, these are not the breeding sites these animals originally evolved in and optimised their breeding performance to. It thus remains inconclusive if nest-boxes can provide adequate substitutes, ensuring equivalent fitness returns for breeding animals. Additionally, the majority of [...]

Validating morphological condition indices and their relationship with reproductive success in great-tailed grackles

Jennifer Berens, Corina J Logan, Melissa Folsom, et al.

Published: 2020-11-19
Subjects: Animal Sciences, Animal Studies, Ecology and Evolutionary Biology, Life Sciences, Ornithology, Social and Behavioral Sciences

Morphological and physiological variation among individuals has the potential to influence multiple life history characteristics such as dispersal, migration, reproductive success, and survival. Individuals that are in better "condition" can disperse or migrate further or more successfully, have greater reproductive success, and survive longer, particularly in years where environmental conditions [...]

Combining social information use and comfort-seeking for nest site selection in a cavity-nesting raptor

Jennifer Morinay, Federico De Pascalis, Davide M. Dominoni, et al.

Published: 2020-09-30
Subjects: Animal Sciences, Behavior and Ethology, Ecology and Evolutionary Biology, Life Sciences, Ornithology

When selecting a breeding site, individuals can use social information to reduce the uncertainty regarding habitat quality. In particular, individuals from several bird species tend to reuse nests previously occupied by competitors. Re-occupying nests previously used by conspecifics or heterospecifics could result from exploiting social information by copying competitors’ choice (the ‘social [...]

Seasonality, diet, and physiology as a predominant control factors of the moult dynamics in birds – a meta-analysis

Szymon Marian Drobniak, Agnieszka Gudowska

Published: 2020-01-09
Subjects: Animal Sciences, Ecology and Evolutionary Biology, Life Sciences, Ornithology, Other Ecology and Evolutionary Biology, Terrestrial and Aquatic Ecology

Moult is a process, usually occurring annually, in which birds replace their plumage. It is one of the most crucial life-history traits because it restores the functions of plumage and allows a bird to adapt to environmental conditions or special seasonal needs such as breeding and camouflage during non-breeding season. Consequently, moulting has advantages in terms of future performance. [...]

A protocol for using drones to assist monitoring of large breeding bird colonies

Mitchell Lyons, Kate Brandis, John Wilshire, et al.

Published: 2019-04-29
Subjects: Animal Sciences, Behavior and Ethology, Biology, Ecology and Evolutionary Biology, Environmental Monitoring, Environmental Sciences, Life Sciences, Ornithology, Physical Sciences and Mathematics, Research Methods in Life Sciences, Zoology

Drones are rapidly becoming part of environmental monitoring and management applications. They provide an opportunity to improve a number of activities related to monitoring population dynamics of aggregations of wildlife. Bird surveys using drones have attracted particular attention, with a range of potential metrics able to be derived from high resolution drone imagery. Whilst a number of [...]

A continental measure of urbanness predicts avian response to local urbanization

Corey Thomas Callaghan, Richard E. Major, Will Cornwell, et al.

Published: 2019-03-26
Subjects: Animal Sciences, Biodiversity, Biology, Ecology and Evolutionary Biology, Environmental Monitoring, Environmental Sciences, Life Sciences, Ornithology, Physical Sciences and Mathematics, Social and Behavioral Sciences, Urban Studies and Planning

Understanding species-specific relationships with their environment is essential for ecology, biogeography, and conservation biology. Moreover, understanding how these relationships change with spatial scale is critical to mitigating potential threats to biodiversity. But methods which measure inter-specific variation in responses to environmental parameters, generalizable across multiple spatial [...]

Seeing rare birds where there are none: self-rated expertise predicts correct species identification, but also more false rarities

Nils Bouillard, Rachel White, Hazel Jackson, et al.

Published: 2019-02-04
Subjects: Animal Sciences, Biodiversity, Life Sciences, Ornithology

The use of crowdsourced data is growing rapidly, particularly in ornithology. Citizen science greatly contributes to our knowledge, however, little is known about the reliability of data collected in that way. We found, using an online picture quiz, that self-proclaimed expert birders were more likely to misidentify common British bird species as exotic or rare species, compared to people who [...]

Monitoring large and complex wildlife aggregations with drones

Mitchell Lyons, Kate Brandis, Nick Murray, et al.

Published: 2019-01-02
Subjects: Animal Sciences, Ecology and Evolutionary Biology, Environmental Monitoring, Environmental Sciences, Life Sciences, Ornithology, Physical Sciences and Mathematics, Research Methods in Life Sciences, Terrestrial and Aquatic Ecology

• Recent advances in drone technology have rapidly led to their use for monitoring and managing wildlife populations but a broad and generalised framework for their application to complex wildlife aggregations is still lacking • We present a generalised semi-automated approach where machine learning can map targets of interest in drone imagery, supported by predictive modelling for estimating [...]

Timber harvest and tree size near nests explains variation in nest site occupancy but not productivity in northern goshawks (Accipiter gentilis)

Sabrina Rodriguez, Patricia L. Kennedy, Timothy H Parker

Published: 2018-12-10
Subjects: Animal Sciences, Ecology and Evolutionary Biology, Forest Management, Forest Sciences, Life Sciences, Ornithology

Conservation concern for the northern goshawk (Accipiter gentilis) reflects evidence that goshawks may abandon nest sites or suffer from reduced nesting success in response to some forms of timber harvest. However, this evidence is mixed and has yet to be reviewed systemically and quantitatively. Therefore, we conducted a meta-analysis to assess the extent to which timber harvest and tree size [...]

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