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401 results for “breeding birds”

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zenodo40/100

Fig. 6 in Ethological Aspects Of Biodiversity Within And Between Phylloscopus Species: Behavioral Variation Among Birds From The Centre And Periphery Of Breeding Ranges

Fig. 6. Change of places of singing (1, 2, etc.) during a season in Wood Warblers. Examples for some different controlled males are indicated by the lines of different types (2007 – 2014).

opencc-by-4.0Dec 2015View details →

zenodo40/100

Fig. 1 in Ethological Aspects Of Biodiversity Within And Between Phylloscopus Species: Behavioral Variation Among Birds From The Centre And Periphery Of Breeding Ranges

Fig. 1. Population densities of the Leaf Warblers in the study area at different stages of reproductive seasons of 2007 – 2014.

opencc-by-4.0Dec 2015View details →

zenodo40/100

Fig. 2 in Ethological Aspects Of Biodiversity Within And Between Phylloscopus Species: Behavioral Variation Among Birds From The Centre And Periphery Of Breeding Ranges

Fig. 2. The overlapping of projections of Chiffchaff territories ('maximum-territories' according to the point mapping method) and the real segregating of the territorial rooms in space: a scheme.

opencc-by-4.0Dec 2015View details →

zenodo40/100

Рис. 5. Особенности окраски верха гоΛовы (a), спинных перьев (b) и верха крыΛа (c) у моΛоΑых птиц маΛого (a — сверху, b — сΛева, c — справа) и китайского (a — снизу, b — справа, c — сΛева) воΛчков Fig. 5. Colouration of the upper head (a), dorsal feathers (b), and upper covers (c) in young birds of little (a — above; b — left; c — right) and yellow (a — below; b — right; c — left) bitterns in The first case of breeding of little bittern Ixobrychus minutus and hybrids of I. minutus with I. sinensis in the Russian Far East

Рис. 5. Особенности окраски верха гоΛовы (a), спинных перьев (b) и верха крыΛа (c) у моΛоΑых птиц маΛого (a — сверху, b — сΛева, c — справа) и китайского (a — снизу, b — справа, c — сΛева) воΛчков Fig. 5. Colouration of the upper head (a), dorsal feathers (b), and upper covers (c) in young birds of little (a — above; b — left; c — right) and yellow (a — below; b — right; c — left) bitterns

opencc-by-4.0Dec 2022View details →

dryad40/100

Data for: Should I breed or should I go? Manipulating individual state during migration influences breeding decisions in a long-lived bird species

Documentation of Carry-Over Effects (COEs), defined as effects resulting from events that occurred in a previous time period, has largely been observational and understanding of specific mechanisms underlying COEs is still lacking. To investigate this, we simulated an environmental perturbation during the spring migration of a long-lived bird species and looked at the subsequent effects on various breeding parameters. We captured female greater snow geese (Anser caerulescens atlanticus) on their spring staging sites and maintained individuals in captivity for up to four days before releasing them. We re-observed females 3000 km North, on their Arctic breeding grounds, to estimate their breeding propensity (i.e., probability of initiating a reproductive event for a given year), and measure their arrival date, laying date, clutch size, and nesting success. Only proxies of breeding propensity were affected by our manipulation, which decreased as the time spent in captivity increased. However, females were able to overcome the effects of captivity in two out of the three years of experimentation with normal or good environmental conditions at the breeding site. When facing the additional challenge of poor environmental conditions, many individuals manipulated during migration apparently curtailed their reproductive effort by skipping breeding. This experiment is the first to show that breeding propensity is an important parameter affected by COEs resulting from stressful events prior to reproduction in long-lived species.

opencc-zeroDec 2022View details →

dryad40/100

Data from: Time series of bird abundances, land cover and temperature from standardized breeding bird monitoring schemes (line transects and point count routes) from Norway, Sweden and Finland, for 1975-2016

These data on bird species abundance and environmental variables were used in testing and comparing two different species distribution model validation methods that are applied to models which are used to predict the effects of climate change on species' distributions. The aim of the study was to investigate whether different validation methods give different results of the model's predictive performance and to demonstrate that validation methods based on measuring and validating a "static" pattern in distribution can assess model performance over-optimistically compared to methods based on measuring and validating a "change" in the distribution, which can assess the predictive performance more critically.

opencc-zeroFeb 2023View details →

dryad40/100

Symbiotic microbiota vary with breeding group membership in a highly social joint-nesting bird

Symbiotic microbes affect the health, fitness, and behavior of their animal hosts, and can even affect the behavior of non-hosts. Living in groups presents numerous benefits and challenges to social animals, including exposure to symbiotic microbes, which can mediate both cooperation and competition. In social mammals, individuals from the same social group tend to share more similar microbes, and this social microbiome, the microbial community of all hosts in the same social group, can shape the benefits and costs of group living. In contrast, little is known about the social microbiome of group-living birds. We tested the predictions that communally breeding smooth-billed anis (Crotophaga ani) belonging to the same breeding group share more similar microbes and that microbial community composition differs between body regions. To test this, we used 16S rRNA gene sequencing to characterize the preen gland and body feather microbiota of adult birds from 16 breeding groups at a long-term study site in southwestern Puerto Rico. As predicted, individuals from the same breeding group shared more similar microbiota than non-group members and preen gland and body feathers harboured distinct microbial communities. Future research will evaluate whether this social microbiome affects the behavior of group living birds.

opencc-zeroApr 2023View details →

dryad40/100

Bird breeding season linked to sunshine hours in a marginally seasonal equatorial climate

The timing of reproduction is a fundamental aspect of life history, yet the breeding seasons of most birds of the world, i.e., those in the tropics, remain poorly understood. Here we use more than 3,000 mist-netting records and 300,000 citizen scientist observations collected over six years to characterize the nesting, incubation, fledging, and juvenile stages of the breeding season on Singapore Island in Southeast Asia's equatorial rainforest zone. The breeding season was compared with climate variables and food availability to identify possible proximate and ultimate causes. Breeding was seasonal and began just after the rainiest months of the year, when insect abundance was highest and when masting events were most likely to occur. While true photoperiod varied little throughout the year, overcast weather in November–December and sunnier weather in February–March caused average daily sunshine to increase by several hours at the onset of the breeding season in all six years. Our data suggest that subjective daily sunshine hours, which correlate with photoperiod at higher latitudes but not in the tropics, may be the actual proximate trigger of breeding activity in most of the world's birds.

opencc-zeroMay 2023View details →

dryad40/100

Does social information affect the settlement decisions of resident birds in their second breeding attempt? A case study of the Japanese tit (Parus minor)

Individuals may gather information about environmental conditions when deciding where to breed in order to maximize their lifetime fitness. Many studies have shown that birds can rely on social information to select their nest site. The location of active nests and the reproductive success of conspecifics and heterospecifics can provide accurate predictions about the quality of the breeding habitat. Some short-lived species can facultatively reproduce two and/or more times within a breeding season. However, few studies have focused on how multiple-brooding individuals select nest sites for their second breeding attempts. In this study, we use long-term data to test whether the Japanese tit (Parus minor) can use social information from conspecifics and/or heterospecifics to select a nest site for the second breeding attempt. Our results showed that the nest boxes occupied by tits on their second breeding attempt tended to be surrounded by more breeding conspecific nests, first-breeding successful conspecific nests, and fewer first-breeding failed conspecific nests than the nest boxes that remained unoccupied (the control group). However, the numbers of breeding heterospecific nests, successful heterospecific nests, and failed heterospecific nests did not differ between the nest boxes occupied by tits on their second breeding attempt and the unoccupied nest boxes. Furthermore, the tits with local successful breeding experience tended to choose areas with more first-breeding successful conspecific nests than those without successful breeding experience. Thus, we suggest that conspecifics' but not heterospecifics' social information within the same breeding season is the major factor influencing the nest site selection of Japanese tits during second breeding attempts.

opencc-zeroJul 2023View details →

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