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57 results for “Tyto alba”
FIGURE 1 in Glaucalges tytonis sp. n. (Analgoidea, Xolalgidae) from the barn owl Tyto alba (Strigiformes, Tytonidae): compiling morphology with DNA barcode data for taxon descriptions in mites (Acari)
FIGURE 1. Glaucalges tytonis sp. n., male. A – ventral view, B – dorsal view. Setal designations after Gaud and Atyeo (1996).
Datasets for "Individual and environmental factors influencing preen gland's morphology and physiology in the barn owl (Tyto alba)"
<p><span>Avian preen gland helps birds cope with their environment, although its overall functioning remains unclear. We shed light on the complexity of the preen gland’s functioning by studying how multiple factors associate with gland morphology (size and shape) and physiology (wax secreted) in barn owls (<em>Tyto alba</em>). Individual factors (sex, breeding stage, body condition) were more important predictors of preen gland than environmental factors (temperature, humidity, brood size). Sex, depending on breeding stage in adults, influenced preen gland traits, pointing to the preen gland’s regulation by sex hormones and a greater pressure on females to protect their eggs, offspring and themselves throughout reproduction. Adults and fledglings in better condition had larger glands, pointing to the existence of physiological costs. Temperature and humidity, in interaction with plumage coloration, also influenced but to a lesser extent preen gland traits, suggesting that melanin pigmentation and preen gland act as superseding mechanisms when protecting plumage against microorganisms. Finally, fledglings living in larger broods had larger glands, suggesting a role for the social environment in preen gland’s functioning. Overall, our study supports the idea that preen gland functions in diverse biological contexts within the same species and is thus subject to multiple selective pressures.</span></p>
Sexual maturity in Barn Owl (Tyto alba)
<p>The age at first reproduction can significantly impact fitness. We investigated the possible source of variation in the age at first reproduction ("sexual maturity") and its consequences for lifetime reproductive success in a wild population of barn owls. This raptor is sexually dimorphic for two melanin-based plumage traits shown to covary with sex-specific behaviour and physiology. We observed that females were sexually mature earlier than males, an effect that depended on the colour of their plumage and birth date. Among females born early in the season, dark melanic (i.e. more pheomelanic with large and many black feather spots) yearlings were sexually mature earlier than light melanic females. The relationship was in the opposite direction in those born late in the season. In yearling males, the opposite result, albeit less pronounced, was discovered, i.e. lightly melanic males born early in the season were sexually mature earlier than dark melanic males, an effect that was in the opposite direction in males that were born late in the season. Individuals that matured faster produced a larger number of fledglings per year than individuals that matured slower, an effect that was found only in dark melanic females and in light melanic males. Dark melanic females also achieved a higher lifetime reproductive success (LRS) than light melanic conspecifics. Our results suggest that a light melanic plumage is beneficial in males and a dark melanic plumage in females suggesting sexually antagonist selection.</p>
Tyto alba
Cráneo de lechuza (*Tyto alba*), también conocido como lechuza blanca, lechuza de campanario, suindara o suinda. En Chile está presente desde Arica hasta Tierra del Fuego, en zonas urbanas y rurales. Ejemplar del Área de Zoología de Vertebrados del MNHN. Source: Objaverse 1.0 / Sketchfab
Supplementary material 1 from: Colihueque N, Gantz A, Rau JR, Parraguez M (2015) Genetic divergence analysis of the Common Barn Owl Tyto alba (Scopoli, 1769) and the Short-eared Owl Asio flammeus (Pontoppidan, 1763) from southern Chile using COI sequence. ZooKeys 534: 135-146. https://doi.org/10.3897/zookeys.534.5953
Pictures of external morphology of specimens of Tyto alba and Asio flammeus collected in southern Chile: Explanation note: Pictures of ventral and dorsal views of specimens showing plumage color and overall appearance. Data on body mass of these specimens are also provided.
Data from: Double brooding and offspring desertion in the barn owl (Tyto alba)
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Sexual maturity in Barn Owl (Tyto alba)
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FIGURE 6 in Glaucalges tytonis sp. n. (Analgoidea, Xolalgidae) from the barn owl Tyto alba (Strigiformes, Tytonidae): compiling morphology with DNA barcode data for taxon descriptions in mites (Acari)
FIGURE 6. Length of setae d2 and e2 in males of Glaucalges tytonis sp. n. and G. attenuatus.
FIGURE 4 in Glaucalges tytonis sp. n. (Analgoidea, Xolalgidae) from the barn owl Tyto alba (Strigiformes, Tytonidae): compiling morphology with DNA barcode data for taxon descriptions in mites (Acari)
FIGURE 4. Epigynum and oviporus in female Glaucalges tytonis sp. n. GA—genital acetabula.
Figure 4 in Seasonal variation of small mammals in the diet of the barn owl (Tyto alba) in the Drinos River valley, southern Albania
Figure 4. Seasonal variation in biomass (%) of small mammal species in the diet of barn owls in the Drinos valley.
0 in Seasonal variation of small mammals in the diet of the barn owl (Tyto alba) in the Drinos River valley, southern Albania
0% Autumn (F%) W nter (F%) Spr ng (F%) Summer (F%) Figure 3. Seasonal variation in frequency (%) of small mammal species in the diet of barn owls in the Drinos valley.
Figure 3 from: Colihueque N, Gantz A, Rau JR, Parraguez M (2015) Genetic divergence analysis of the Common Barn Owl Tyto alba (Scopoli, 1769) and the Short-eared Owl Asio flammeus (Pontoppidan, 1763) from southern Chile using COI sequence. ZooKeys 534: 135-146. https://doi.org/10.3897/zookeys.534.5953
Figure 3 - Unrooted haplotype network of COI gene sequence, based on a median-joining network for the Common Barn Owl and the Short-eared Owl. The area of each circle is proportional to the number of individuals containing the haplotype. Open circles indicate mutational events and numbers refer to the variable nucleotide positions. A Common Barn Owl; Solid black: Chile/South America; white with cross lines: Argentina/South America; white with forward diagonal lines: USA/ North America; white with horizontal lines: El Salvador/ Central America; white with vertical lines: Canada/ North America; white with backward diagonal lines: Sweden/ northern Europe; white with backward diagonal cross lines: Australia/ Australasia. B Short-eared Owl; Solid black: Chile/South America; white with cross lines: Argentina/South America; white with forward diagonal lines: USA/ North America; white with horizontal lines: Canada/ North America; white with backward diagonal lines: Sweden/ northern Europe; white with horizontal lines: Russia/ northern Asia; white with cross diagonal lines: Norway/ northern Europe.
Figure 2 from: Colihueque N, Gantz A, Rau JR, Parraguez M (2015) Genetic divergence analysis of the Common Barn Owl Tyto alba (Scopoli, 1769) and the Short-eared Owl Asio flammeus (Pontoppidan, 1763) from southern Chile using COI sequence. ZooKeys 534: 135-146. https://doi.org/10.3897/zookeys.534.5953
Figure 2 - Haplotype designation, variable nucleotide positions of COI gene sequence analysis, with the haplotype frequency observed in each locality. A Haplotypes of Common Barn Owls (n = 21) B haplotypes of Short-eared Owl (n = 10). Number refers to positions identified in the alignment. For all haplotypes, variable nucleotides are indicated while identity is indicated by slashes.
Figure 4 from: Colihueque N, Gantz A, Rau JR, Parraguez M (2015) Genetic divergence analysis of the Common Barn Owl Tyto alba (Scopoli, 1769) and the Short-eared Owl Asio flammeus (Pontoppidan, 1763) from southern Chile using COI sequence. ZooKeys 534: 135-146. https://doi.org/10.3897/zookeys.534.5953
Figure 4 - Phylogenetic estimate of relationships among specimens of the Common Barn Owl from different locations based on analysis of 582 bp of the mitochondrial cytochrome c oxidase subunit I gene (COI). The haplotype, locality and Genbank accession number (in parentheses) for each specimen are shown. The branch lengths are drawn proportional to the relative amount of volutionary change. Scale indicates the sequence divergence estimated from the number of nucleotide substitutions per site A Maximum likelihood tree with the bootstrap support (%) indicated for each node B Bayesian tree with the posterior probability values indicated for each node.
Figure 1 from: Colihueque N, Gantz A, Rau JR, Parraguez M (2015) Genetic divergence analysis of the Common Barn Owl Tyto alba (Scopoli, 1769) and the Short-eared Owl Asio flammeus (Pontoppidan, 1763) from southern Chile using COI sequence. ZooKeys 534: 135-146. https://doi.org/10.3897/zookeys.534.5953
Figure 1 - Map of southern Chile, illustrating the collection places of Common Barn Owl and Short-eared Owl specimens. Black squares- Common Barn Owl (n = 9), white square- Short-eared Owl (n = 1).
Figure 1 in Barn Owl (Tyto alba) prey in Evros (Greece) and the discovery of a new mammal for the Greek fauna
Figure 1. Hemimandibles and alveolar pattern of Glis glis (a) Muscardinus avellanarius (b) Dryomys nitedula (c) and Myomimus roachi (d).
Map 1 in Barn Owl (Tyto alba) prey in Evros (Greece) and the discovery of a new mammal for the Greek fauna
Map 1. Map of sample locations. Squares show sampling through live-traps. Dark circles show pellet samples with more than 100 individuals and light circles show pellet samples with less than 100 individuals (for further detail see Table 2).
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