Tawny Owl (Strix aluco) Science Article 6 abstract The Tawny Owl Strix aluco was studied at the northernmost limit of its geographical range (63degree20’N) in order to investigate how this extremely residential species has adapted to the marginal conditions of its northern outpost. The presence of nemoral forest vegetation was crucial for the occurrence of […]
Category: Eurasia
Breeding of the tawny owl Strix aluco in Finland: responses of a southern colonist to the highly variable environment of the north
Tawny Owl (Strix aluco) Science Article 7 abstract Large-scale patterns and variations in the occurrence and breeding of the Tawny Owl Strix aluco in Finland was studied in relation to the availability of small voles and winter ing birds as well as to general weather conditions of the preceding winter. In 1986-2000, pronounced three-year cycles […]
Notes on the breeding of Striolated Bunting Emberiza striolata near Pune, Maharashtra (India)
Striolated Bunting (Emberiza striolata) Science Article 1 abstract Striolated Bunting Emberiza striolata is recorded in northwest India up to southern Uttar Pradesh (Etawah), central Madhya Pradesh (Sagar) and central Maharashtra (Daulatabad) (Ali & Ripley 1974). Pande et al. (2003) reported its occurrence in Maharashtra up to Sanglidistrict. Satish Pande, Amit Pawashe and Vishwas Joshi, Indian […]
Habitat use by Moltoni’s Warbler Sylvia cantillans moltonii in Italy
Subalpine Warbler (Sylvia cantillans) Science Article 1 abstract Moltoni’s Warbler Sylvia cantillans moltonii is a poorly studied bird endemic to a restricted area in the central-western Mediterranean. We analysed selection of different vegetation structural types byMoltoni’sWarblers for singing and foraging in two hilly areas in the northern Apennines (Italy) with low-intensity farming. We related habitat […]
Spring migration of the Garden Warbler (Sylvia borin)across the Mediterranean Sea
Spectacled Warbler (Sylvia conspicillata) Science Article 1 abstract Information concerning the strategy adopted by passerine migrants in crossing ecologicalbarriers is still scant, especially as far as spring migration is concerned. With the aim ofinvestigating the pattern of desert and sea crossing in spring, capture frequency, biometryand physical conditions of Garden Warblers ringed at 18 stations […]
Female starlings adjust primary sex ratio in response to aromatic plants in the nest
Spotless Starling (Sturnus unicolor) Science Article 1 abstract Adjustment of offspring sex ratios should be favoured by natural selection when parents are capable of facultatively altering brood sex ratios and of recognizing the circumstances that predict the probable fitness benefit of producing sons and daughters. Although experimental studies have shown that female birds may adjust […]
Daylength determines departure date of the Spotted Flycatcher Muscicapa striata from its winter quarters.
Spotted Flycatcher (Muscicapa striata) Science Article 1 abstract The annual arrival and departure dates of the Spotted Flycatcher Muscicapa striata at Bloemfontein in the Orange Free State, South Africa, were noted for a continuous period of 36 years (1950-1986). According to a stepwise regression analysis, daylength is by far the most important environmental factor influencing […]
Breeding success of Spotted Flycatchers Muscicapa striata in southern England – is woodland a good habitat for this species?
Spotted Flycatcher (Muscicapa striata) Science Article 2 abstract The UK population of the Spotted Flycatcher Muscicapa striata has declined markedly in the last 30 years but there have been few recent studies of the species. This study examined the relationship between nest success and the predominant habitat type around Spotted Flycatcher nests in two contrasting […]
Age-related trends in the breeding success of individual female Sparrowhawks Accipiter nisus
Sparrowhawk (Accipiter nisus) Science Article 4 abstract Overall, female Sparrowhawks improved in the mean number of young they raised per year up to the 5th year of life, and then declined. An attempt is made to find to what extent this mean trend is caused by similar trends in the breeding of individual females, and […]
The abundance of essential vitamins in food chains and its impacton avian reproduction
Sparrowhawk (Accipiter nisus) Science Article 3 abstract Birds produce fewer or less viable eggs if the micro-nutrient requirements for reproduction cannot be met. Forexample, embryos from failed eggs of European sparrowhawks Accipiter nisus often show anomalies that indicate vitamin B2deficiency. B2 is only produced by plants and is propagated through the food chain. Here, egg […]