Relationships between nest site, breeding time, laying order, and egg characteristics with a stress hormone in Whiskered Tern - Journal of Ornithology

Stress during egg-laying and chick rearing significantly impacts egg quality and reproductive success. This stress can be transmitted from parents to offspring through hormones, adversely affecting em...

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Hatching date in Northern Wheatears, as a proxy of nest site selection, shows a longitudinal gradient in the white dunes and occurs earlier in older males in the grey dunes on Norderney - Journal of O...

Understanding species’ nest site selection is essential for successful species conservation, because it allows to identify critical areas, allocate resources efficiently, and formulate effective measu...

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Niche partitioning in diet and foraging habitat between two sympatric marsh terns - Journal of Ornithology

Understanding how ecologically similar species coexist in shared environments is a central question in community ecology, especially where closely related species breed sympatrically and exploit overl...

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Probability and latency of vocal responses of the Little Owl (Athene noctua) in a low-density farmland population: methodological implications for monitoring - Journal of Ornithology

Reliable monitoring of nocturnal birds requires survey protocols that account for imperfect detection and temporal variation in vocal activity. We evaluated how the probability of vocal response to pl...

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Song variation across space and time in Anna’s Hummingbird (Calypte anna) - Journal of Ornithology

Birds use song to communicate in multiple contexts, including territoriality and courtship. Of particular interest is the phenomenon of song sharing, in which direct neighbors’ songs are more similar ...

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The influence of land cover and conservation areas on priority bird species in British Columbia, Canada - Journal of Ornithology

Conservation areas (CAs) are critical tools in biodiversity conservation, yet their relationship to species of highest conservation need (i.e., species that are rare, range-restricted, sensitive to ha...

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Navigating ecological barriers in the North Atlantic: migratory routes, stopover strategies and flight behaviour of Ruddy Turnstones Arenaria interpres - Journal of Ornithology

Ecological barriers represent significant challenges during bird migration, as they imply long non-stop flights over unsuitable habitats. Strategies to limit these energy-costly flights include detour...

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First records of migration route, phenology, and nonbreeding locations of the Desert Purple Martin (Progne subis hesperia) - Journal of Ornithology

Purple Martins (Progne subis) are long-distance migratory, aerial insectivores facing population declines, yet critical gaps remain in our understanding of the full annual cycle for all recognized sub...

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Telemetry alone may not be reliable for a correct determination of population-level migration timing: lessons from Eleonora’s Falcon (Falco eleonorae) - Journal of Ornithology

Tracking technologies have revolutionized the study of bird migration, offering unparalleled insights into ecology, behaviours and flyways. However, due to the typically small proportion of individual...

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From release to migration: early ranging behaviour of headstarted Eurasian Curlews (Numenius arquata) - Journal of Ornithology

Headstarting is increasingly used as a conservation intervention for the Eurasian Curlew (Numenius arquata), yet evidence on the early post-release movement ecology of captive-reared juveniles remains...

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Laser-based isotope profiling in avian tissues: a high-resolution method for ecological reconstruction - Journal of Ornithology

Keratinous and bony tissues preserve ecological information, yet conventional isotope methods often lack the spatial resolution to detect fine-scale dietary or habitat transitions. Here, we present a ...

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The quantitative analysis of the hooklets’ distribution in a bird wing feather of Columba palumbus (Columbidae, Aves) - Journal of Ornithology

Flight in birds is supported by the presence of wing feathers known as remiges. Particularly, the asymmetrically shaped primary feathers (Remiges primarii) generate the necessary lift that allows a bi...

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Density of endemic parakeets in relation to conservation management, ungulate abundance and forest cover in the Parc Provincial des Grandes Fougères, New Caledonia - Journal of Ornithology

Protected areas help endangered species by conserving their natural habitat. The endemic New Caledonian Parakeet (Cyanoramphus saisseti) and Horned Parakeet (Eunymphicus cornutus) occur in the Parc Pr...

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Migration and migratory connectivity of Greater Spotted Eagles (Clanga clanga) wintering at the head of the Arabian Gulf - Journal of Ornithology

Understanding migration routes, seasonal timing, and movement strategies of long-distance migrants is essential for evaluating population connectivity and informing conservation. The Greater Spotted E...

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Determinants of primary moult suspension in Dunlins (Calidris alpina), migrating through the southern Baltic coast - Journal of Ornithology

Moult in birds is a highly energetically expensive process. Therefore, feather replacement in most species does not coincide with breeding or migration periods. However, when time constraints prevent ...

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Phenology of Swainson’s Thrush apparent territory establishment across an elevational gradient - Journal of Ornithology

Migratory birds that arrive early to their breeding sites occupy higher quality habitat, secure preferred mates, and may gain fitness advantages. It is widely assumed that arrival date is subject to n...

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Experimental treatment of avian malaria: atovaquone–proguanil achieves complete clearance of Plasmodium relictum - Journal of Ornithology

Avian malaria, caused by Plasmodium parasites, commonly persists as a chronic infection, yet reliable treatment protocols remain insufficiently evaluated. Assessing treatment efficacy is essential for...

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Prevalence of haemosporidian parasites in raptors in rehabilitation centers across the United States - Journal of Ornithology

Avian haemosporidians are common vector-transmitted parasites that infect birds. Although avian haemosporidians have been studied extensively in songbirds, less is known about haemosporidian prevalenc...

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Avian haemosporidians: interactions, health, and global change - Journal of Ornithology

Journal of Ornithology -

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Hatch timing and parental bare part coloration are associated with chick growth in a mutually ornamented seabird - Journal of Ornithology

In species with obligate bi-parental care, investment by both parents in a current reproductive bout is critical to offspring growth and survival. The degree to which an individual can invest in their offspring relies on their quality as a parent. Parental quality can be communicated between individuals in a mated pair via ornamental features, as they may honestly reflect aspects of direct or indirect investment in offspring. In this study, we investigated whether the yellow-orange fleshy integuments of Atlantic Puffins Fratercula arctica reflect parental quality, as approximated by offspring hatch date and growth metrics. No aspect of parental coloration predicted hatch date, but several metrics of maternal and paternal coloration predicted offspring mass growth, peak mass and normalized wing growth. We also explored whether hatch date influenced patterns of chick growth and found that timing (before or after the arrival of the main food source) significantly predicted mass and skeletal growth. Specifically, early hatching chicks achieved higher peak masses but exhibited reduced wing growth, potentially reflecting alternative strategies between investing primarily in weight gain or structural development. Together, these results highlight chick growth as a complex feature associated with both breeding phenology and parental phenotype.

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Hematological responses of understory birds to haemosporidian parasites across land use and seasonal gradients in a cloud forest ecosystem of Veracruz, Mexico - Journal of Ornithology

Haemosporidian parasites can alter host immune and physiological condition, yet their hematological effects may depend on habitat disturbance and seasonality. We investigated how haemosporidian infect...

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High-resolution telemetry reveals a globally important migration bottleneck for Lesser Spotted Eagles (Clanga pomarina) on the shores of Lake Tanganyika - Journal of Ornithology

Migratory routes align with leading lines where favorable soaring conditions occur. Soaring raptors, including the Lesser Spotted Eagle (Clanga pomarina), avoid large water bodies and mountain ranges ...

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