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203 results for “bird nest”

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dryad36/100

Data and analysis code for Norton and DuVal - Causes and consequences of nest site fidelity in a tropical lekking bird: win-stay-lose-shift tactics are unrelated to subsequent success, but site-faithful females nest earlier

Nest site selection influences the survival of care-giving parents and their offspring, but search costs and site availability may limit site choices. Returning to previous nest sites may reduce costs and allow parents to better avoid local predators or access familiar resources. We investigated nest site fidelity in the Lance-tailed Manakin (Chiroxiphia lanceolata), in which long-lived females raise offspring without male assistance, and found that site choices are responsive to past success but do not predict future outcomes. We compared georeferenced nest locations for the same females detected in consecutive years (245 comparisons for 138 females) and females nesting repeatedly within a year (137 comparisons for 97 females). Females were faithful to nesting sites in 13.9% of comparisons across years and 10.2% within years, and were more likely to nest again in the same site if their offspring fledged. When switching sites, females moved farther if their previous nest failed. Nest-site fidelity was unrelated to mate fidelity or female age. We then assessed whether site choice related to subsequent female survival, nest timing, or nest survival. Contrary to the hypothesis that win-stay-lose-shift tactics improve subsequent nesting outcomes, we found females were no more likely to fledge chicks or survive to a later year after they reused nest-sites. However, across years, site-faithful females nested earlier on average than females that switched sites. Early nests were more likely to fledge chicks, and early-nesting females were more likely to renest when their first nesting effort was complete. Win-stay-lose-shift tactics may allow females to avoid areas where predation is likely, but new nest sites are not safer. Females that reuse nest sites benefit from early nest initiation, which both correlates with immediate success and creates potential for longer-term benefits of fidelity through increased opportunities to renest throughout the breeding season.

opencc-zeroApr 2023View details →

dryad36/100

Data from: Fast visual adaptation to dim light in a cavity-nesting bird

Many birds move fast into dark nest cavities forcing the visual system to adapt to low light intensities. Their visual system takes between 15 and 60 minutes for complete dark adaptation, but little is known about the visual performance of birds during the first seconds in low light intensities. In a forced two-choice behavioural experiment we studied how well budgerigars can discriminate stimuli of different luminance directly after entering a darker environment. The birds made their choices within about one second and did not wait to adapt their visual system to the low light intensities. When moving from a bright facility into an environment with 0.5 log unit lower illuminance, the budgerigars detected targets with a luminance of 0.825 cd/m2 on a black background. When moving into an environment with 1.7 or 3.5 log units lower illuminance, they detected targets with luminances between 0.106 and 0.136 cd/m2. In tests with two simultaneously displayed targets, the birds discriminated similar luminance differences between the targets (Weber fraction of 0.41-0.54) in all light levels. Our results support the notion that partial adaptation of bird eyes to the lower illumination occurring within one second allows them to safely detect and feed their chicks.

opencc-zeroApr 2023View details →

dryad36/100

Nest initiation and end dates for eight grassland bird species in Wisconsin and Illinois

We used nest records from published grassland bird studies done in Wisconsin and Illinois to compile a dataset for 8 obligate grassland bird species Study sites were clustered in southwestern Wisconsin near Mt. Horeb (43.0167°N, 89.7500°W); sites were located in Dane, Grant, Green, Iowa, Lafayette, Monroe, and Rock counties. In northern Illinois, study sites were located in Lee, Ogle, Will, Grundy, Carroll, and Jo Daviess counties (40.9822 to 42.2356°N, -87.5433 to -90.3489°W).The dataset consists of 3257 nests with observations on nest initiation date (date first egg laid), nest fate (success, failure), number of fledglings, and nest end date (date the nest either failed or fledged at least one nestling). The species were Bobolink, Dickcissel, Eastern Meadowlark, Grasshopper Sparrow, Henslow's Sparrow, Savannah Sparrow, Vesper Sparrow, and Western Meadowlark.

opencc-zeroAug 2023View details →

zenodo36/100

Fig. 1 in Research on nesting birds on the territory of Kaliakra Wind Farm

Fig. 1. Location of "Kaliakra" wind farm.

opencc-by-4.0Jan 2018View details →

zenodo36/100

Data, code, and metadata for: Symbiotic acacia ants drive nesting behavior by birds in an African savanna

Data, code, and metadata that can be used to reproduce the analyses underlying 'Symbiotic acacia ants drive nesting behavior by birds in an African savanna' by Lujan, Nielsen et al. 2023 Biotropica (Preprint: https://doi.org/10.1101/2023.03.06.531340).Individual data owners are detailed in the data. Data may only be used to reproduce the analyses underlying Lujan, Nielsen, et al. (2023). Any other use requires the written permission of the data owners.For more detailed information, please visit the metadata file.

opencc-by-4.0Sep 2023View details →

dryad36/100