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199 results for “Nestling”
Effects of brood and group size on nestling provisioning and resource allocation in a communal bird
<p>Resource limitations, either due to environmental conditions or constraints on parental provisioning effort, can drive intense competition among offspring. In communal groups, resource availability may increase if parents receive assistance from other group members; however, if those caregivers also produce young, offspring demand may increase at the same time. It is possible, therefore, that the costs of intrabrood competition in large broods may outweigh the benefits of provisioning from additional caregivers. We tested the relationships between group size, brood size, and provisioning rates in the greater ani (<em>Crotophaga</em> <em>major</em>), a communally nesting cuckoo in which multiple breeding pairs and nonreproductive helpers cooperatively raise a shared brood. Crucially, brood and group size can vary independently in this species, allowing us to test changes in each variable separately. Using video footage of 2255 prey deliveries across 10 nests, we found that an increase in the number of adult caregivers within a group did not sufficiently offset a corresponding increase in the number of dependent young within a brood: prey availability per average nestling decreased with brood size, regardless of group size. In larger broods, last-hatched nestlings received significantly less prey than their broodmates, in part due to greater hatching asynchrony that exacerbated competitive asymmetries and facilitated inequality in food allocation. Our results indicate that last-hatched ani nestlings suffer a "double cost" in large broods: they must compete with more nestmates, and suffer disproportionately from asynchronous hatching. These costs may contribute to increased parent-offspring conflict and may constrain group size in communal breeders.</p>
Data for: Nestling mouth colors mediate parental favoritism but minimally influence detectability
<p>Young animals often solicit care from their parents using behaviors and morphologies collectively termed begging. Many nestling altricial birds add to their familiar postures and vocalizations by displaying colorful mouthparts, hypothesized to enhance their visual conspicuousness and/or signal information about individual quality. We evaluated these hypotheses with three experimental manipulations of the flange tissue of house sparrow (<em>Passer domesticus</em>) nestlings. We allowed parents to interact with nestlings that appeared to have either carotenoid-rich or carotenoid-poor flanges, and then with nestlings that appeared similar in carotenoid-richness but differed in either brightness (total light reflected) or ultraviolet richness. These three features of flange color comprise much of the variation observed both within and among species. Neither our manipulation of apparent carotenoid- nor UV-richness shaped parents' ability to transfer prey efficiently to nestlings, a proxy for how visually detectable nestlings were. We found some evidence that brightness shaped parents' ability to transfer large prey items. Parents preferentially allocated prey to nestlings that appeared carotenoid-rich, but did not bias allocation when we manipulated brightness or UV reflectance. These patterns suggest that nestlings displaying carotenoid-rich flanges benefit from parental favoritism, and that any role of brightness in offspring-parent interactions comes via detectability benefits. UV reflectance does not seem to shape parental care. Efforts to understand mouth color in the context of offspring-parent communication and visual signal evolution may benefit from considering the component parts of color, as they may function, be constrained, and evolve independently.</p>
Elder barn owl nestlings flexibly redistribute parental food according to siblings’ need or in return for allopreening
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Experimental ectoparasite removal has a sex-specific effect on nestling telomere length
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Data from: Relationship between maternal environment and DNA methylation patterns of estrogen receptor alpha in wild Eastern Bluebird (Sialia sialis) nestlings: a pilot study
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Data from: Tail color signals performance in blue tit nestlings
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Data from: The use of the nest for parental roosting and thermal consequences of the nest for nestlings and parents
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Data from: Great spotted cuckoo nestlings have no antipredatory effect on magpie or carrion crow host nests in southern Spain
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Data from: Physiological conditions and genetic controls of phaeomelanin pigmentation in nestling barn swallows
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Data from: Urban environment shortens telomere length in nestling great tits, Parus major
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Data from: Proximity to roads, but not exposure to metal pollution, is associated with accelerated developmental telomere shortening in nestling great tits
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Data from: Effects of experimental nest treatment with herbs on ectoparasites and body condition of nestlings
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Data from: Nest-box temperature affects clutch size, incubation initiation, and nestling health in great tits
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Digital records of Brown-headed Cowbirds removing eggs and nestlings from nests of grassland passerine birds in southwest Wisconsin
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Data from: Decoding colouration of begging traits by the experimental addition of the appetite enhancer cyproheptadine hydrochloride in magpie (Pica pica) nestlings
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Immunological changes in nestlings growing under predation risk
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Contrasting multi-level relationships between behavior and body mass in blue tit nestlings
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Does blood loss explain higher resting metabolic rates in nestling birds with hematophagous ectoparasites?
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Spatiotemporal variation in hatching success and nestling sex ratios track rapid movement of a songbird hybrid zone
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Data from: Limited consequences of infestation with a blood-feeding ectoparasite for the nestlings of two North Pacific seabirds
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.