Journal Description
Birds
Birds
is an international, peer-reviewed, open access journal on ornithology published quarterly online by MDPI.
- Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.
- High Visibility: indexed within ESCI (Web of Science), Scopus, AGRIS, and other databases.
- Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 20.6 days after submission; acceptance to publication is undertaken in 3.7 days (median values for papers published in this journal in the first half of 2024).
- Journal Rank: JCR - Q1 (Ornithology) / CiteScore - Q2 (Animal Science and Zoology)
- Recognition of Reviewers: Reviewers who provide timely, thorough peer-review reports receive vouchers entitling them to a discount on the APC of their next publication in any MDPI journal. While single-blind peer review is standard, reviewers have the option available for signed peer review, and reviewer names are published annually in the journal.
- Birds is a companion journal of Animals.
Impact Factor:
1.5 (2023)
Latest Articles
Aspects of Movement Ecology and Habitat Use of Migratory Raptors Using Satellite Telemetry from India to Central Asia
Birds 2024, 5(3), 487-508; https://doi.org/10.3390/birds5030033 - 15 Aug 2024
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Single individuals of the Greater Spotted Eagle (Clanga clanga), Indian Spotted Eagle (Clanga hastata), Tawny Eagle (Aquila rapax), Western Marsh Harrier (Circus aeruginosus), and two Pallid Harriers (Circus macrourus) were deployed with satellite
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Single individuals of the Greater Spotted Eagle (Clanga clanga), Indian Spotted Eagle (Clanga hastata), Tawny Eagle (Aquila rapax), Western Marsh Harrier (Circus aeruginosus), and two Pallid Harriers (Circus macrourus) were deployed with satellite transmitters in 2021 to study their home ranges, habitat associations, movement, and migration patterns. Data were collected for a combined number of 2291 days, providing 84,544 locations. Home ranges were calculated as kernel utilization distributions and expressed as 95% KDE and core areas as 50% KDE. Overall, eagles had larger home ranges (mean ± SD) of 942.70 ± 937.83 km2 compared to harriers, 43.84 ± 35.55 km2. Among eagles, the Greater Spotted Eagle had the largest home-range size of 2147.03 km2 calculated in Kazakhstan, while the female Pallid Harrier had the smallest home range of 5.74 km2 in Russia. Daily and monthly distances varied among eagles and harriers. The female Pallid Harrier covered the longest average monthly distance of 8585.43 ± 11,943.39 km, while the shortest monthly distance of 1338.22 ± 716.38 km was traveled by the Indian Spotted Eagle. All tagged birds migrated toward higher latitudes in the Northern hemisphere, except the Indian Spotted Eagle, which migrated to Pakistan. The male Western Marsh Harrier covered the longest migration distance in a shorter span of time, while the female Pallid Harrier took the longest to cover its migration distance. Overall, the daily distance covered during migration varied from 115.09 km traveled by the Indian Spotted Eagle to an overwhelming distance of 2035.85 km covered by the male Western Marsh Harrier. Scrubs, water bodies, croplands, and settlements were important habitat features associated with eagles, while croplands, open scrub, and built-up areas were associated with the female Pallid Harrier. The male Western Marsh Harrier was found to be primarily associated with saltpans and salt-affected areas having emergent vegetation. This study presents new insights into the movement and spatial ecology of long-distance migrant raptors that winter in Western India. We provide preliminary support for the use of the Western Circum–Himalayan Corridor as one of the important corridors of the Central Asian Flyway that warrants much appreciation among the current set of flyway corridors.
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Open AccessFeature PaperArticle
Innovative Foraging Behavior of Urban Birds: Use of Insect Food Provided by Cars
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Jukka Jokimäki and Anna Ramos-Chernenko
Birds 2024, 5(3), 469-486; https://doi.org/10.3390/birds5030032 - 10 Aug 2024
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Despite high-quality insect food being often restricted in cities, insects are important for the development of birds. Nonetheless, plenty of insects are smashed on cars, and they are available for those species that are able to use them. We used both our own
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Despite high-quality insect food being often restricted in cities, insects are important for the development of birds. Nonetheless, plenty of insects are smashed on cars, and they are available for those species that are able to use them. We used both our own data and community science and Internet sources for surveying global, national, and local data about birds using insects on cars. Our results contained a total of 308 observations of birds collecting insects on car panels, which indicated that 39 species used this food resource since 1928 in 33 countries. Most observations considered the House Sparrow, followed by the White Wagtail and several species of corvids. European urban bird species observed to use insects on cars had a larger residual brain size. There was also some indication that bird species using insects on cars had a larger number of innovations (i.e., production of novel behaviors), greater diet generalism, and longer times living in urbanized areas than birds not observed using insects on cars. Often these species are also resident and able to use food offered in feeding sites. We assume that more bird species will use insects on cars in the future, as urban insect populations continue to decline, and thereby insects on cars will increasingly become more important sources of food for urban birds.
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Open AccessArticle
Small Endemic Birds and Hot Climate: Avian and Environmental Predictors of Avifauna Road Mortality in Santa Cruz Galapagos
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Gustavo Jiménez-Uzcátegui, Heydi Roa-López, Daniela Penafiel, Galo Quezada, Andrea Loyola, Byron Delgado, Nicolas Moity, Olivier Devineau and Franklyn Betancourt
Birds 2024, 5(3), 453-468; https://doi.org/10.3390/birds5030031 - 10 Aug 2024
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In the Galapagos Islands, the main road in Santa Cruz is one of the elements involved in bird road mortality along with vehicles and the impacted species. This study reports the number of roadkilled birds found on the road from the Itabaca Channel
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In the Galapagos Islands, the main road in Santa Cruz is one of the elements involved in bird road mortality along with vehicles and the impacted species. This study reports the number of roadkilled birds found on the road from the Itabaca Channel to Puerto Ayora, and the main factors, whether avian or environmental, involved in bird roadkill mortality. We collected individual carcasses in 2004, 2005, 2006, and 2018 with a prevalence of 278, 252, 265, and 294, respectively, across 21 species. The endemic Yellow Warbler Setophaga petechia aureola was the most affected bird. We used a PRIDIT model to rank the top avian and environmental predictors of road mortality. We found that for the sampled years, bird body size (i.e., 8–35 g) and the endemism status (i.e., endemic/native) were the main predictors of roadkill mortality, along with seasonality (i.e., hot season). Weaker predictors related to the bird (i.e., age and sex) and the environment (ecosystem, road slope, vegetation, or precipitation) are also reported as determinants of roadkill mortality. This study on avian mortality aims to inform conservation strategies to reduce the rate of wildlife avian roadkill on Santa Cruz Island and other islands with similar problems.
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Open AccessArticle
Reproductive Success of Tree Swallows at Abandoned Mine Drainage Treatment Ponds
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James S. Kellam, Julianna E. Lott, Anna R. Doelling and Isabella Ladisic
Birds 2024, 5(3), 440-452; https://doi.org/10.3390/birds5030030 - 10 Aug 2024
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Abandoned mine drainage treatment ponds could have contrasting effects on the reproductive success of birds living in the vicinity. The ponds and associated vegetation may, like any other body of freshwater, provide beneficial habitats for the insects that the birds use to feed
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Abandoned mine drainage treatment ponds could have contrasting effects on the reproductive success of birds living in the vicinity. The ponds and associated vegetation may, like any other body of freshwater, provide beneficial habitats for the insects that the birds use to feed their young; or instead, the ponds may act as an ecological trap, attracting the birds to a habitat that is poor in quality and negatively impacting their productivity. We monitored nests of an aerial insectivore, the Tree Swallow (Tachycineta bicolor), to determine whether the distance between the ponds and the nests affected various reproductive parameters including clutch size, hatch rate, number of nestlings, nestling size and mass, number of fledglings, fledging rate, and fledge date. Data were collected over two breeding seasons (2022 and 2023) from a swallow population in southwestern Pennsylvania, USA. We found that the nests closest to the treatment ponds had significantly more nestlings and fledglings, earlier fledge dates, and a better fledging rate when compared to nests that were more distant from the ponds. However, all these parameters were well below previously published values, which suggests that the mine drainage ponds provide good nesting habitats relative to what is available in the region but that they do not represent high-quality habitats for this species overall.
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Open AccessArticle
Molecular Prevalence and Haematological Assessments of Avian Malaria in Wild Raptors of Thailand
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Sirawit Subaneg, Ratiwan Sitdhibutr, Pornchai Pornpanom, Preeda Lertwatcharasarakul, Raveewan Ploypan, Aksarapak Kiewpong, Benya Chatkaewchai, Nithima To-adithep and Chaiyan Kasorndorkbua
Birds 2024, 5(3), 428-439; https://doi.org/10.3390/birds5030029 - 9 Aug 2024
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Raptors (Accipitriformes, Falconiformes and Strigiformes) are important for ecological niches as bioindicators and an apex predator; however, their global populations have continuously decreased due to human activities, habitat loss and contagious diseases. Avian malaria that may cause the negative impact on raptors’ health
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Raptors (Accipitriformes, Falconiformes and Strigiformes) are important for ecological niches as bioindicators and an apex predator; however, their global populations have continuously decreased due to human activities, habitat loss and contagious diseases. Avian malaria that may cause the negative impact on raptors’ health may also contribute to the declining of raptor populations. This study reported malaria’s molecular prevalence and genetic diversity in wild-caught and rehabilitated raptors in the Kasetsart University Raptor Rehabilitation Unit. In total, 109 raptors from 18 provinces of Thailand were classified into two groups, which included 78 diurnal raptors (DIRs) in Accipitriformes and 31 nocturnal raptors (NORs) in Strigiformes. Each ethylenediaminetetraacetic (EDTA) blood sample (0.5–1 mL) was tested through haematological analyses and polymerase chain reaction (PCR)-based detection to assess parasites’ health impacts. Amplicons of PCR positive samples were analysed for a nucleotide sequencing and phylogenetic relationships. The overall prevalence of avian malaria was low at 3.67% (4/109) (95% CI: 1.44–9.06%), with a prevalence of 3.86% (3/78) (95% CI: 1.32–10.70%) in DIRs and 3.23% (1/31) (95% CI: 1.32–10.70%) in NORs. Most of the infected samples were from southern Thailand. This suggested that the raptors in humid habitats are more vulnerable to the malarial infection, which was likely associated with vector and parasite abundance. Clinical appearances and haematological examinations demonstrated that raptors could tolerate the infection and only became asymptomatic and subclinically infected. This study is the first report of the infection of avian malaria in Cinerous Vulture, Himalayan Vulture and Barred Eagle Owl in Thailand, providing baseline information in preparedness for the disease diagnostic and further study of avian malaria in some endangered raptor species.
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Open AccessFeature PaperArticle
Temporal Characterization of the Viral Load of Psittacine Beak and Feather Disease Virus in Rosy-Faced Lovebirds (Agapornis roseicollis)
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Derek Kong Lam, Emily Shui Kei Poon and Simon Yung Wa Sin
Birds 2024, 5(3), 417-427; https://doi.org/10.3390/birds5030028 - 5 Aug 2024
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Psittacine beak and feather disease virus (BFDV) is a widespread and highly pathogenic virus in parrots. The disease typically presents with feather and beak abnormalities, along with possible immune system suppression. No cure or commercialized vaccine is currently available. Our understanding of the
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Psittacine beak and feather disease virus (BFDV) is a widespread and highly pathogenic virus in parrots. The disease typically presents with feather and beak abnormalities, along with possible immune system suppression. No cure or commercialized vaccine is currently available. Our understanding of the Psittacine beak and feather disease often comes from infected individuals with visible symptoms. Limited knowledge exists regarding the pathology and role of asymptomatic individuals in disease transmission. Asymptomatic individuals could shed the virus in their crop secretion, feces, or feathers. In this study, we investigated the temporal change in the viral load in feather and fecal samples from 17 asymptomatic Rosy-faced Lovebirds (Agapornis roseicollis) using qPCR. Our results showed that most of the individuals had very low viral load, while three individuals with high viral load at the beginning of the experiment were observed to exhibit a decreasing trend in viral load in both fecal and feather samples. Surprisingly, the viral load in an individual can drop from a high level to an undetectable level within three months. This suggests that BFDV infection might not be lethal or highly pathogenic for some individuals. We also showed that the viral load in feathers was higher than in feces.
Full article
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Open AccessArticle
Winter Bird Diversity and Community Structure in Relation to Shrub Cover and Invasive Exotic Natal Grass in Two Livestock Ranches in the Chihuahuan Desert, Mexico
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Mieke Titulaer, Cielo Marisol Aragón Gurrola, Alicia Melgoza Castillo, Angela A. Camargo-Sanabria and Nathalie S. Hernández-Quiroz
Birds 2024, 5(3), 404-416; https://doi.org/10.3390/birds5030027 - 31 Jul 2024
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Grasslands are one of the most threatened terrestrial biomes leading to a loss of grassland biodiversity, including birds. Here, we studied the wintering grassland bird diversity and community structure in two private livestock ranches in the Chihuahuan Desert, Mexico. We explored how bird
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Grasslands are one of the most threatened terrestrial biomes leading to a loss of grassland biodiversity, including birds. Here, we studied the wintering grassland bird diversity and community structure in two private livestock ranches in the Chihuahuan Desert, Mexico. We explored how bird communities are related to vegetation structure, including shrub cover and invasive exotic natal grass (Melinis repens), two drivers of grassland bird habitat degradation. We used Hill’s numbers to estimate taxonomic species richness and diversity and related these metrics to vegetation covariables using linear models. We employed nonmetric dimensional scaling (NMDS) to explore the importance of vegetation covariates in structuring bird communities. We found that bird species diversity was significantly and negatively related to bare ground cover at a plot level. At the ranch level, shrub cover, grass height and natal grass were important in structuring avian communities, negatively affecting the presence and abundance of grassland specialist bird species. Our results indicated that shrub encroachment and invasive exotic natal grass cover may alter grassland bird communities and should, therefore, be considered in grassland bird conservation management.
Full article
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Open AccessFeature PaperArticle
The Effects of Disturbance Intensity on Tropical Forest Bird Communities and Vegetation Structure after Two Decades of Recovery
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Alex Glass and Nico Arcilla
Birds 2024, 5(3), 388-403; https://doi.org/10.3390/birds5030026 - 25 Jul 2024
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As tropical forests are frequently impacted by human disturbance, forests in various stages of disturbance recovery are increasingly important for maintaining biodiversity. However, much remains unclear regarding the impacts of prior disturbance intensity on wildlife in regenerating forests. Here, we used mist net
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As tropical forests are frequently impacted by human disturbance, forests in various stages of disturbance recovery are increasingly important for maintaining biodiversity. However, much remains unclear regarding the impacts of prior disturbance intensity on wildlife in regenerating forests. Here, we used mist net capture data to compare bird communities in three tropical forest habitats representing various disturbance intensities: undisturbed primary forest, selectively logged forest (low disturbance), and secondary forest regenerating on abandoned agricultural fields (high disturbance). We found that after a 19-year recovery period, low-disturbance sites contained similar bird communities to undisturbed sites. High-disturbance sites, however, had lower species richness and distinct bird communities, with fewer insectivores and more nectarivores than other sites. Structural equation models revealed that the impacts of disturbance intensity on bird communities were partially explained by changes in vegetation structure: ant-following insectivore abundance declined with disturbance intensity as ground cover vegetation increased, and nectarivore abundance increased with disturbance intensity as tree density decreased. Our results suggest that selectively logged forests can regain pre-disturbance bird diversity and vegetation structure within two decades, provided that they are protected from further disturbance and located near source species pools. Increasing tree density and decreasing ground-level vegetation in secondary forests may improve these areas as habitats for forest-interior birds.
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Open AccessFeature PaperArticle
DNA Prevalence of Eukaryotic Parasites with Zoonotic Potential in Urban-Associated Birds
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Xabier Cabodevilla, Juan E. Malo, Daniel Aguirre de Carcer, Julia Zurdo, Rubén Chaboy-Cansado, Alberto Rastrojo and Juan Traba
Birds 2024, 5(3), 375-387; https://doi.org/10.3390/birds5030025 - 24 Jul 2024
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Synanthropic birds might play an important role as reservoirs of many zoonotic endoparasites; however, little information is available on many parasites and their prevalence. Here, we use an approach based on targeted metagenomic detection through the use of DNA metabarcoding of faecal samples
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Synanthropic birds might play an important role as reservoirs of many zoonotic endoparasites; however, little information is available on many parasites and their prevalence. Here, we use an approach based on targeted metagenomic detection through the use of DNA metabarcoding of faecal samples to screen for circulating parasites in alien parakeets (Myiopsitta monachus and Psittacula krameri) and urban landfill-feeding storks (Ciconia ciconia) and gulls (Larus fuscus). We focus especially on potentially zoonotic parasites, with the aim of better understanding the zoonotic risk that these birds’ faeces may pose. We detected a total of 23 genera of eukaryotic parasites: six fungi, three protists, five nematodes, two cestodes and seven trematodes. Among them, six stood out for their relevance to human health: Cryptococcus spp., Aspergillus spp. and Candida spp. (fungi); Cryptosporidium spp. (a protist); and Ascaris spp. and Halicephalobus spp. (nematodes). In parakeets, we detected Cryptococcus spp. and Ascaris spp., the latter being detected in 10–20% of the samples. In the White Stork and the Lesser Black-backed Gull, we found a high prevalence of Aspergillus spp. (in 15% and 50% of the samples, respectively) and Candida spp. (in 63% and 82% of the samples, respectively), and the presence of Cryptosporidium spp. in 10% of the samples. We detected Halicephalobus spp. in one gull sample (2%). Our results show that synanthropic birds may act as vectors and reservoirs of zoonotic parasites and their faeces could pose a risk to human health associated with the zoonotic parasites present in them. This should be taken into account when developing management plans for urban populations of these bird species.
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Open AccessFeature PaperArticle
Exploring Mountain Hikers’ Wildlife Value Orientations and Disturbance of Birds of Prey: A Case Study from Norway
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Yosra Zouhar, Øystein Aas and Hilde Nikoline Hambro Dybsand
Birds 2024, 5(3), 363-374; https://doi.org/10.3390/birds5030024 - 23 Jul 2024
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Wildlife value orientations (WVOs) are useful for gaining knowledge about how humans’ relationship to nature, wildlife, and management differs between groups in society. Our study investigated the level of acceptance for the implementation of measures to avoid the disturbance of golden eagles among
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Wildlife value orientations (WVOs) are useful for gaining knowledge about how humans’ relationship to nature, wildlife, and management differs between groups in society. Our study investigated the level of acceptance for the implementation of measures to avoid the disturbance of golden eagles among hikers with different WVOs. Our results indicated differences between WVO typologies regarding how they assessed the consequences of outdoor recreation on nature and wildlife, as well as measures to manage human traffic. These findings contributed to confirming our hypotheses that peoples’ WVOs have an impact on how people assess wildlife and the natural environment, and that WVOs affect the acceptance of management measures. This study concluded that identifying and studying visitors’ WVOs contributes to understanding the underlying dimensions that influence peoples’ attitudes and behavior. WVOs has not been studied in a Norwegian context previously, and this study contributes new knowledge that is useful for managing human–wildlife relations in more sustainable ways.
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(This article belongs to the Special Issue Birds and People)
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Open AccessArticle
Artificial Light at Night Increases Growth and Impairs Reproductive Success in Budgerigars (Melopsittacus undulatus) in a Duration Dose-Dependent Manner
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Malek Itay and Abraham Haim
Birds 2024, 5(3), 352-362; https://doi.org/10.3390/birds5030023 - 12 Jul 2024
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Short-wavelength artificial light at night is increasingly being associated with health and ecological risks. The negative impact of this relatively new source of pollution has been studied intensively in wild birds but to a much lesser extent in captive conspecifics. Using an avian
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Short-wavelength artificial light at night is increasingly being associated with health and ecological risks. The negative impact of this relatively new source of pollution has been studied intensively in wild birds but to a much lesser extent in captive conspecifics. Using an avian model, our objective was to evaluate the effects of short-wavelength (200 lux at 460 nm) lighting on the body mass and reproductive success of Budgerigars (Melopsittacus undulatus) under captive conditions. Birds were maintained under a naturally increasing photoperiod from March to June, with one daily artificial light at night exposure of increasing duration (0, 30, 60, and 90 min) in the middle of the dark period. During the experiments, birds were monitored monthly for body mass, number of eggs laid, hatching success, and melatonin sulfate levels in droppings. Artificial light at night increased body mass and decreased melatonin sulfate levels as well as the number of eggs and hatching success in a duration dose-dependent manner. Our findings provide further evidence of the potential adverse impact of artificial light at night on captive birds and advocate the need for effective controlling measures for light pollution.
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Open AccessReview
A Worldwide Review of Snowy Owl Feeding Ecology: The Importance of Lemmings and Voles in a Changing Climate
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Denver W. Holt, Matthew D. Larson, Mathew T. Seidensticker and Stephen P. Hiro
Birds 2024, 5(3), 341-351; https://doi.org/10.3390/birds5030022 - 8 Jul 2024
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We compared Snowy Owl feeding ecology from 15 breeding season studies throughout Nearctic and Palearctic circumpolar regions. We used raw data and information theory to assess the owls’ feeding niche. Combined studies yielded 59,923 prey items, of which 59,585 were used for calculations.
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We compared Snowy Owl feeding ecology from 15 breeding season studies throughout Nearctic and Palearctic circumpolar regions. We used raw data and information theory to assess the owls’ feeding niche. Combined studies yielded 59,923 prey items, of which 59,585 were used for calculations. Overall, mean food niche breadth (FNB) was narrow: H′ = 1.95; R = 1.60, D = 0.526. In 10 of 15 studies, lemmings were > 71.8% of the owls’ diet. In four studies, Lemmus was > 90% of the diet, and in three studies Dicrostonyx was >90% of the diet. In three other studies, Lemmus represented 71.8%, 73.8%, and 84.0% of the diet. In one study, Lemmus and Dicrostonyx were about equal: 49.1% and 47.5%. In the four remaining studies, Microtus and Clethrionomys voles were important. In contrast, of 5888 winter prey items from seven North American studies, the mean FNB (H′ = 4.61) was twice that of 15 breeding season scores, FNB (H’ = 1.95). The Snowy Owl is primarily an obligate lemming predator for breeding. Changes to population ecology and distribution of lemmings due to climate change will have direct affects and effects on the Snowy Owls’ reproductive output. The conservation of Snowy Owls is the conservation of lemmings.
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Open AccessEssay
Birds and People: A Symbiotic Relationship in Practice
by
Richard William Butler
Birds 2024, 5(2), 328-340; https://doi.org/10.3390/birds5020021 - 19 Jun 2024
Abstract
This Special Issue of Birds is focused on a number of ways in which people and birds interact with nature, and the example discussed here incorporates four of the seven relationships noted. These are: how birds and birding connect people with nature, the
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This Special Issue of Birds is focused on a number of ways in which people and birds interact with nature, and the example discussed here incorporates four of the seven relationships noted. These are: how birds and birding connect people with nature, the role of communities in the study and conservation of birds, the involvement of people with professional ornithologists, and citizens’ perception and knowledge of birds. The island of Fair Isle provides the location for the examination of these relationships, illustrating the positive interaction between the two human populations of the island and the two avian populations. It is based on fieldwork and literature studies conducted at intervals over a sixty-year period and a review of written and photographic evidence dating back to the beginning of the twentieth century. The purpose of the paper therefore, is to discuss how the relationships between the human and avian populations of the island have changed over time to a more positive and mutually dependent relationship, which is somewhat unique and can be described as symbiotic.
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(This article belongs to the Special Issue Birds and People)
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Open AccessFeature PaperArticle
Factors Affecting the Winter Distribution of Birds in Forests at the Eastern Edge of Europe
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Arthur Askeyev, Oleg Askeyev, Igor Askeyev and Tim Sparks
Birds 2024, 5(2), 308-327; https://doi.org/10.3390/birds5020020 - 14 Jun 2024
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We show for the first time the results of a study into the spatial distribution of birds in forests at the eastern edge of Europe (Republic of Tatarstan, Russia) and changes from early to late winter. A transect method was used to census
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We show for the first time the results of a study into the spatial distribution of birds in forests at the eastern edge of Europe (Republic of Tatarstan, Russia) and changes from early to late winter. A transect method was used to census randomly selected plots spread over a large geographical area in the winters 2018/9–2022/3. We used regression and ordination methods to assess the influence of key environmental factors on species richness, total density of birds, biological diversity, and the probabilities of occurrence of individual species. The most abundant bird species in early winter was the Willow Tit, and in the late winter was the Common Redpoll. Compared with the end of the 20th century, the number of wintering bird species has increased in the study area, likely due to climate warming. Species richness, total density, and the Shannon Index of diversity were higher in early winter than in late winter. Species richness and the Shannon Index were also higher at low elevations and in the west of the study region. Our research shows strong ecological-geographical differences in the preferences of individual bird species in the studied forests. However, almost without exception, birds had a higher probability of occurrence at lower elevation and toward the west.
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Open AccessFeature PaperReview
Nest Design and Breeding Success: Replicability of Methodologies and Research Findings in Secondary Hole Nesting Passerines
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Marcel M. Lambrechts and D. Charles Deeming
Birds 2024, 5(2), 278-307; https://doi.org/10.3390/birds5020019 - 12 Jun 2024
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More than 40 hypotheses predict associations between features of nest architecture and at least one measure of reproductive success. However, quantitative studies of reproductive consequences of nest characteristics remain scarce. In addition, most studies were conducted on model species of which nests can
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More than 40 hypotheses predict associations between features of nest architecture and at least one measure of reproductive success. However, quantitative studies of reproductive consequences of nest characteristics remain scarce. In addition, most studies were conducted on model species of which nests can be easily monitored with artificial nest-boxes. Here, we review the replicability of research protocols and findings in model species, with many repeat studies focusing mainly on nest-size components, animal-derived nest material, or fresh greenery in model species of secondary hole-nesting birds: Blue Tits (Cyanistes caeruleus), Great Tits (Parus major), Tree Swallows (Tachycineta bicolor), and Starlings (Sturnus spp.). The studies looked for correlations between nest traits and aspects of breeding performance that can be easily quantified in the field, such as clutch size, brood size at hatching or fledging, the percentage of eggs that hatch or fledge, or nestling characteristics assumed to reflect qualities associated with survival probabilities (e.g., morphometry, body condition, blood profiles). We discuss the consequences of poor replicability of research methodologies and provide explanations for why many of these studies reported poor associations between nest design and breeding success at different spatiotemporal scales. We also make suggestions for future research.
Full article
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Open AccessFeature PaperArticle
Bird Species Knowledge and Its Antecedents in US High School Students—A Case Study from Michigan
by
Robin Egger, Talia Härtel and Christoph Randler
Birds 2024, 5(2), 265-277; https://doi.org/10.3390/birds5020018 - 7 Jun 2024
Abstract
Bird identification is a necessary skill for citizen science projects, and teaching and learning about species is essential to halt the decline in biodiversity. Here, we investigated bird species knowledge in a case study of Michigan high school students using an online survey.
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Bird identification is a necessary skill for citizen science projects, and teaching and learning about species is essential to halt the decline in biodiversity. Here, we investigated bird species knowledge in a case study of Michigan high school students using an online survey. Participants were asked to identify 21 common species, covering a wide range of orders and families. On average, high school students achieved a correct identification score of 35%. The most well-known species were the American Robin, Blue Jay, Cardinal and Turkey Vulture. We found no difference between boys and girls, but identification scores declined with increasing age. Interest was an important predictor of identification knowledge, as were activities (field trips, outings) both in and out of class. Among species traits, high knowledge of a species was positively related to the number of eBird entries (as a proxy for year-round population size), body mass (heavier species were better known) and internet presence. We suggest expanding this study to other states, and we encourage educators and teachers to improve bird knowledge through birding field trips.
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(This article belongs to the Special Issue Birds and People)
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Open AccessFeature PaperArticle
Flight Initiation Distance in an Urban Bird: Influence of the Number of People, Gaze Orientation, and Bird Behavior
by
Natália Cardoso de Resende, Camila Palhares Teixeira and Cristiano Schetini de Azevedo
Birds 2024, 5(2), 255-264; https://doi.org/10.3390/birds5020017 - 5 Jun 2024
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Background: The flight initiation distance (FID) measures the distance a bird flees from an approaching predator. Factors such as the frequency of predator approaches, the direction of predator gaze, variations in predator presence across different areas, and the specific behaviors displayed by predators
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Background: The flight initiation distance (FID) measures the distance a bird flees from an approaching predator. Factors such as the frequency of predator approaches, the direction of predator gaze, variations in predator presence across different areas, and the specific behaviors displayed by predators can all affect the FID. For birds, people can assume the role of predators. Methods: This study aimed to evaluate whether the FID of the species Sicalis flaveola (Saffron finch, Aves, Passeriformes) is influenced by the number of people and their gaze direction, comparing areas with the greater and lesser flow of people and relating to the types of behavior exhibited by the birds. Results: The results showed that the number of people walking towards the bird influenced the escape behavior, with more people generating longer FIDs than fewer people. If the approach was with the eyes fixed on the birds, the FIDs were longer. When birds were alert, FIDs were longer. Conclusion: Overall, the findings imply that birds exhibit nuanced reactions to human presence, even in areas with frequent human encounters, highlighting their advanced capacity for assessing and responding to perceived risks.
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Open AccessArticle
Diet and Feeding Behavior of the South Polar Skuas Stercorarius maccormicki in the Haswell Islands, East Antarctica
by
Sergey Golubev
Birds 2024, 5(2), 240-254; https://doi.org/10.3390/birds5020016 - 31 May 2024
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The diet and feeding behavior of South Polar Skuas (Stercorarius maccormicki) are well studied within the species’ breeding range but are poorly understood on the Haswell Islands. The aim of this study was to determine how South Polar Skuas use available
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The diet and feeding behavior of South Polar Skuas (Stercorarius maccormicki) are well studied within the species’ breeding range but are poorly understood on the Haswell Islands. The aim of this study was to determine how South Polar Skuas use available resources during the pre-breeding and breeding periods at the Haswell Archipelago (66°31′ S, 93°01′ E, Davis Sea, Southern Ocean) under conditions of prolonged human activity. I studied pellets, spontaneous regurgitation, and stomach contents of feathered birds to study the diet of skuas and used direct observations of their feeding behavior. South Polar Skuas at the Haswell Islands fed primarily on the Emperor Penguin (Aptenodytes forsteri) colony and on terrestrial resources in the Adélie Penguin (Pygoscelis adeliae) and fulmarine petrel colonies. The dominant prey of skuas were breeding Antarctic penguins. Emperor Penguins and Adélie Penguins make up the bulk of the skuas’ diet in the pre-breeding and breeding periods. Surface feeding at sea was observed in the post-breeding period. In recent decades, kitchen waste supported the skua population. Scavenging (placenta and feces of Weddell seals [Leptonychotes weddellii], frozen eggs, chicks and adults of breeding bird species, kitchen refuse) is the dominant strategy for obtaining food. Adélie Penguin eggs and chicks were the main food items of the South Polar Skuas in the Haswell Archipelago. Skua predation could potentially influence the breeding success of Adélie Penguins and fulmarine petrels, but the extent of the impact is unknown. The impact of the South Polar Skua on Emperor Penguins is negligible because skuas feed mainly on frozen chicks and eggs of the species.
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Open AccessArticle
Population Trend of Colonially Nesting Heron Species in Greece
by
Savas Kazantzidis, Theodoros Naziridis, Evangelia Katrana, Nikolaos Bukas, Georgios Kazantzidis, Aristidis Christidis and Christos Astaras
Birds 2024, 5(2), 217-239; https://doi.org/10.3390/birds5020015 - 15 May 2024
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Heron colonies are dynamic components of wetlands. Therefore, their systematic monitoring is important for the management of both birds and wetlands. During the period 1988–2018, we counted breeding pairs of seven colonial breeding heron species at 65 colonies across 37 wetlands in Greece.
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Heron colonies are dynamic components of wetlands. Therefore, their systematic monitoring is important for the management of both birds and wetlands. During the period 1988–2018, we counted breeding pairs of seven colonial breeding heron species at 65 colonies across 37 wetlands in Greece. We considered as annual variables of a population: (a) years since 1988, (b) Natura 2000 network inclusion, (c) protected area management authority overseeing, (d) wetland type (new or restored), and (e) new colonies (established after 2003). The Cattle Egret Bubulcus ibis and the Squacco Heron Ardeola ralloides had a positive breeding population trend. The Black-crowned Night Heron Nycticorax nycticorax, Little Egret Egretta garzetta, and Grey Heron Ardea cinerea had a negative trend, while the Purple Heron Ardea purpurea population was stable. The Great White Egret Ardea alba bred sporadically at only a few sites which precluded the evaluation of its population trend. The informative population variables differed among species, even of those at the same colony, which suggests trends are also affected by conditions at wintering grounds. The study highlights the need for the systematic monitoring of heron colonies and the protection of foraging/breeding areas in order to reverse the observed negative population trends.
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Open AccessArticle
Human Perception of Birds in Two Brazilian Cities
by
Gabriela Rosa Graviola, Milton Cezar Ribeiro and João Carlos Pena
Birds 2024, 5(2), 202-216; https://doi.org/10.3390/birds5020014 - 19 Apr 2024
Abstract
Understanding how humans perceive animals is important for biodiversity conservation, however, only a few studies about this issue have been carried out in South America. We selected two Brazilian cities to assess people’s perceptions of birds: Bauru (São Paulo, Brazil) and Belo Horizonte
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Understanding how humans perceive animals is important for biodiversity conservation, however, only a few studies about this issue have been carried out in South America. We selected two Brazilian cities to assess people’s perceptions of birds: Bauru (São Paulo, Brazil) and Belo Horizonte (Minas Gerais, Brazil). From the available bird data for each city, we developed a questionnaire and applied it between September 2020 and June 2021. The data obtained were analyzed by simple counts, a Likert scale, and percentages. Also, human feelings related to birds were placed on the Free Word Cloud Generator website. Our study confirmed that most respondents were aware of the importance of birds to ecological balance and that respondents had a generally positive attitude towards most of the bird species. However, they disliked exotic species such as the Domestic Dove and the House Sparrow, which are associated with disease, dirt, and disgust. Respondents also underestimated the number of birds that can live in urban areas and the song of birds is still a sense less experienced and perceived by people. Understanding these human–biodiversity relationships can help guide public policies and environmental education activities.
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(This article belongs to the Special Issue Birds and People)
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