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57 results for “Tyto alba”
Fig. 2 in Difference In Small Mammal Assemblages In The Diet Of The Common Barn-Owl Tyto Alba Between Two Landscapes
Fig. 2. Difference of estimated species richness of the Common Barn-owl's food composition between two landscape categories, based on individual rarefaction analysis
Fig. 1 in Difference In Small Mammal Assemblages In The Diet Of The Common Barn-Owl Tyto Alba Between Two Landscapes
Fig. 1. Study area in the South-Transdanubian region, Hungary, showing the location of sampled nesting sites (settlements) and the two separated landscape types, indicated by different symbols
Fig. 3 in Difference In Small Mammal Assemblages In The Diet Of The Common Barn-Owl Tyto Alba Between Two Landscapes
Fig. 3. Variables factor maps at land-use level (A), species level (B) and guild level (C) in case of the agricultural lands (D-AL) and the semi-natural habitats (D-SNH)
Figure 7 in Diet and reproductive outputs of common barn-owl (Tyto alba) during the common vole (Microtus arvalis) outbreak and crash
Figure 7. GLMM diagrams illustrating the effect of the main and alternative prey taxa and the two derived indices on the number of fledglings (A: Common vole, B: Apodemus genus, C: Microtinae/Murinae ratio, D: Trophic level index).
Figure 5 in Diet and reproductive outputs of common barn-owl (Tyto alba) during the common vole (Microtus arvalis) outbreak and crash
Figure 5. GLMM diagrams illustrating the effect of the main and alternative prey taxa and the two derived indices on clutch size (A: Common vole, B–C: Apodemus genus, D–E: Microtinae/Murinae ratio, F: Trophic level index).
Figure 4 in Diet and reproductive outputs of common barn-owl (Tyto alba) during the common vole (Microtus arvalis) outbreak and crash
Figure 4. Box plots of the relative frequency of the main and alternative prey taxa. The bottom and top limits of each box are the lower and upper quartiles; error bars equal ±1.5 times the interquartile range; the horizontal black band within each box is the median; and the red triangle is the mean.
Figure 6 in Diet and reproductive outputs of common barn-owl (Tyto alba) during the common vole (Microtus arvalis) outbreak and crash
Figure 6. GLMM diagrams illustrating the effect of the main and alternative prey taxa and the two derived indices on the number of hatchlings (A: Common vole, B: Apodemus genus, C: Microtinae/Murinae ratio, D: Trophic level index).
Figure 3 in Diet and reproductive outputs of common barn-owl (Tyto alba) during the common vole (Microtus arvalis) outbreak and crash
Figure 3. Rank abundance curves of the prey composition of the common barn-owl in different outbreak and crash years, and cumulative results of these two periods.
Figure 2 in Diet and reproductive outputs of common barn-owl (Tyto alba) during the common vole (Microtus arvalis) outbreak and crash
Figure 2. Box plots of barn owls' breeding parameters (A: clutch size; B: number of hatchlings; C: number of fledglings). The bottom and top limits of each box are the lower and upper quartiles; error bars equal ±1.5 times the interquartile range; the horizontal black band within each box is the median; and the red triangle is the mean.
Figure 1 in Diet and reproductive outputs of common barn-owl (Tyto alba) during the common vole (Microtus arvalis) outbreak and crash
Figure 1. Study area in Baranya County (Hungary), showing the location of sampled nesting pairs (settlements).
FIGURA 3 in MAMÍFEROS PEQUEÑOS EN LA DIETA DE LA LECHUZA TYTO ALBA (STRIGIFORMES: TYTONIDAE) EN DOS LOCALIDADES DEL OCCIDENTE DE ECUADOR, CON AMPLIACIÓN DISTRIBUCIONAL DE ICHTHYOMYS HYDROBATES (RODENTIA: CRICETIDAE)
FIGURA 3: Vista ventral del cráneo (los más completos) de especies de mamíferos pequeños presentes en las egagrópilas de Tyto alba: A = Phyllotys andium DMMECN 3961, B = Microryzomys altissimus DMMECN 3978, C = M. cf. minutus DMMECN 3921, D = Akodon mollis DMMECN 3973, E = Akodon aerosus DMMECN 3975, F = Melanomys sp. 1 DMMECN 3914, G = M. sp. 2 DMMECN 3951, H = Sigmodon cf. alstoni DMMECN 3833, I = S. peruanus DMMECN 3819, J = Aegialomys xanthaeolus DMMECN 3942, K = Sylvilagus brasiliensis DMMECN 3941, L = Proechimys decumanus DMMECN 3940. Barra = 5 mm. Fotografías: J. Brito.
FIGURA 2 in MAMÍFEROS PEQUEÑOS EN LA DIETA DE LA LECHUZA TYTO ALBA (STRIGIFORMES: TYTONIDAE) EN DOS LOCALIDADES DEL OCCIDENTE DE ECUADOR, CON AMPLIACIÓN DISTRIBUCIONAL DE ICHTHYOMYS HYDROBATES (RODENTIA: CRICETIDAE)
FIGURA 2: Sitios de anidación de las lechuzas: A = en el tumbado de una vivienda en Los Santiagos; B = debajo de un puente en La Ciénaga; C = diferentes formas de egagrópilas, barra = 10 mm. Fotografías: A = H. Cadena-Ortiz, B-C = J. Brito.
FIGURA 4 in MAMÍFEROS PEQUEÑOS EN LA DIETA DE LA LECHUZA TYTO ALBA (STRIGIFORMES: TYTONIDAE) EN DOS LOCALIDADES DEL OCCIDENTE DE ECUADOR, CON AMPLIACIÓN DISTRIBUCIONAL DE ICHTHYOMYS HYDROBATES (RODENTIA: CRICETIDAE)
FIGURA 4: Vista dorsal, ventral y lateral del cráneo de la rata cangrejera Ichthyomys hydrobates DMMECN 3960. Barra = 5 mm. Fotografías: J. Brito.
Fig. 2 in Small mammals from barn owl Tyto alba pellets in a Mediterranean agroforestry landscape of central Italy
Fig. 2 - Dendrogram of similarity based on species frequency (algorithm: Paired group - UPGMA, Euclidean similarity index). / Dendro- gramma di similarità basato sulla frequenza di specie (algoritmo: gruppi appaiati - UPGMA, indice di similarità euclidea). Sites: / Siti: A) Roccaccia. B) Riminino. C) Ripagretta. D) San Giorgio. E) Montericcio.
Fig. 1 in Small mammals from barn owl Tyto alba pellets in a Mediterranean agroforestry landscape of central Italy
Fig. 1 - The study area. Circles and letters (A-E) show the five investigated sites. / Area di studio. I cerchi e le lettere (A-E) indicano i cinque siti studiati.
Fig. 3 in Small mammals from barn owl Tyto alba pellets in a Mediterranean agroforestry landscape of central Italy
Fig. 3 - Detrended Correspondence Analysis. / Analisi delle Corrispondenze 'Detrended' Sites: / Siti: A) Roccaccia; B) Riminino; C) Ripagretta; D) San Giorgio; E) Montericcio. Species: / Specie: Sunetr: Suncus etruscus; Sorsam: Sorex samniticus; Crosua: Crocidura suaveolens; Croleu: Crocidura leucodon; Musave: Muscardinus avellanarius; Arvita: Arvicola italicus; Micsav: Microtus savii; Aposyl: Apodemus cfr. sylvaticus; Musdom: Mus domesticus; Ratrat: Rattus rattus; Ratnor: Rattus norvegicus.
Supplementary material to "Exogenous corticosterone and melanin-based coloration explain variation in juvenile dispersal behaviour in the barn owl (Tyto alba)"
<p><strong>Abstract</strong></p> <p>Natal dispersal affects many processes such as population dynamics. So far, most studies have examined the intrinsic and extrinsic factors that determine the distance between the place of birth and of first breeding. In contrast, few researchers followed the first steps of dispersal soon after fledging. To study this gap, we radio-tracked 95 barn owl nestlings (<em>Tyto alba</em>) to locate their diurnal roost sites from the fledging stage until December. This was used to test whether the age of nest departure, post-fledging movements and dispersal distance were related to melanin-based coloration, which is correlated to fitness-related traits, as well as to corticosterone, a hormone that mediates a number of life history trade-offs and the physiological and behavioural responses to stressful situations. We found that the artificial administration of corticosterone delayed the age when juveniles left their parental home-range in females but not in males. During the first few months after fledging, longer dispersal distances were reached by females compared to males, by individuals marked with larger black feather spots compared to individuals with smaller spots, by larger individuals and by those experimentally treated with corticosterone. We conclude that the onset and magnitude of dispersal is sensitive to the stress hormone corticosterone, melanin-based coloration and body size. </p>
Figure 9 in Micromammalian distribution and abundance in the Western Cape Province, South Africa, as evidenced by Barn owls Tyto alba (Scopoli)
Figure 9. Proportional representation of 3-month age classes (C1–8) of Otomys irroratus at Geelbek in the West Coast National Park by month and season.
Figure 10 in Micromammalian distribution and abundance in the Western Cape Province, South Africa, as evidenced by Barn owls Tyto alba (Scopoli)
Figure 10. Proportion of total measured Otomys irroratus individuals born per month at Geelbek in the West Coast National Park during 1984–8, based on material collected during 1985–8, compared with mean monthly rainfall at Langebaanweg for the same period.
Figure 8 in Micromammalian distribution and abundance in the Western Cape Province, South Africa, as evidenced by Barn owls Tyto alba (Scopoli)
Figure 8. Variation in (A) maxillary and (B) mandibular alveolar length in Tatera afra from selected sites with mean annual precipitation increasing from left to right. SFN and SFS, Steenbokfontein North and South (139 mm); AGA, Andriesgrond (248 mm); BBS, Blombos (464 mm); KFN, Kraaifontein (569 mm); STB, Stellenbosch Airfield (629 mm).
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