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9 results for “Strix aluco”
Fig. 1 in Northern Birch Mouse (Sicista Betulina) In Lithuania, Findings In The Diet Of Tawny Owl (Strix Aluco)
Fig. 1. Sites and UTM squares, where S. aluco nestboxes were situated and pellets collected in 1996–2009. Source: BALČIAUSKIENE et al. 2000, 2005a,b, 2006
Fig. 2 in Northern Birch Mouse (Sicista Betulina) In Lithuania, Findings In The Diet Of Tawny Owl (Strix Aluco)
Fig. 2. Proportions of the prey groups in Tawny Owl diet (SB+ – S. betulina present, SB – S. betulina absent, in all districts p <0.001)
Figure 2 in Seasonal changes in Tawny Owl (Strix aluco) diet in an oak forest in Eastern Ukraine
Figure 2. Proportion of prey groups in Tawny Owl pellets in different seasons. Note break of y axis between 10% and 50%. Abbreviations for seasons: WS – Winter–spring, ES – Early summer, LS – Late summer and early autumn, LA – Late autumn.
Camera trap image of Strix aluco (2018-01-29T05:41:17Z)
Camera Trap Image taken in <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Figure 1 in Seasonal changes in Tawny Owl (Strix aluco) diet in an oak forest in Eastern Ukraine
Figure 1. Location of the study area with indication of pellet collection points.
Importance of melanin-based colouration and environment in shaping intracellular glutathione levels in nestling and adult tawny owls (Strix aluco)
<p>Resources allocated in reproduction are traded off against those invested in self-maintenance such as antioxidant response. Glutathione (GSH) is an intracellular antioxidant defence that scavenges reactive oxygen species, the deleterious byproducts of oxygen consumption. Given the role of intracellular GSH in pheomelanogenesis, a trade-off in GSH allocation between resistance to oxidative stress and melanin production may take place. To investigate how intracellular GSH is regulated in differently coloured individuals at the time of reproduction (in adults) and of intense melanogenesis (in nestlings), we measured the total pool of GSH produced ( t GSH), consumed (oxGSH) and available (redGSH) in adult tawny owls and their offspring which were cross-fostered between randomly chosen nests. Our goal was to describe potential correlations between resistance in oxidative stress and colour morphs in natural conditions. Nestling GSH levels were correlated with GSH levels in their genetic and foster parents suggesting that producing GSH is genetically and environmentally determined (although the effect of the foster nest seemed stronger). This species shows continuous variation in phe - omelanin reddish colouration, which is associated with life-history strategies. Based on the hypothesis of GSH dependence of pheomelanism, we expected a greater amount of oxGSH in dark compared to light pheomelanic nestlings, which was not the case. In contrast, light melanic breeding adults had higher levels of t GSH and redGSH than dark breeders probably because of a higher investment in antioxidant capacity. The link between pheomelanism and GSH may therefore be due to the fact that differently colored individuals have different life-history strategies rather than because the production of pheomelanin pigments requires GSH.</p>
Data from: Pleiotropy in the melanocortin system: expression levels of this system are associated with melanogenesis and pigmentation in the tawny owl (Strix aluco)
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Data from: Does plumage colour signal fitness in the tawny owl Strix aluco?
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Importance of melanin-based colouration and environment in shaping intracellular glutathione levels in nestling and adult tawny owls (Strix aluco)
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