Spotted Sandgrouse (Pterocles senegallus) Science Article 1 abstract Many species of desert birds are relatively small (< 500 g), diurnally active ground dwellers that are naturally exposed to high ambient temperatures (T,) and low relativehumidities (RH). Sandgrouse (Pteroclididae), being small birds (weighing between 200 and 400 g) having a relatively high standard metabolic rate (SMR), […]
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 […]
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 […]
Rediscoveryo f Hylopezus( maculariusa) uricularis:D istinctiveS onga nd HabitatIndicate Species Rank
Spotted Antpitta (Hylopezus macularius) Science Article 1 abstract The first four specimens of Hylopezus macularius auricularis were collected in northern Bolivia in 1937 by Alfonso M. Olalla, who was leading an expedition undertaken by the RoyalN atural History Museum in Stockholm, Sweden. The taxon first was described asa new species (Gyldenstolpe 1941), but later was […]
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 […]
OBSERVATIONS ON THE NESTING OF SPOT-BACKED ANTBIRD(HYLOPHYLAX NaeVIA) IN EASTERN ECUADOR
Spot-backed Antbird (Hylophylax naevius) Science Article 1 abstract Hylophylax antbirds are a small genus of plump, short-tailed antbirds ranging fromHonduras to northern Bolivia, generally below 1100 m elevation, and often associatedwith ant swarms (Hilty & Brown 1989, Ridgely & Tudor 1994, del Hoyo et al. 2003). The Spot-backed Antbird (H. naevia) ranges from southeastern Colombia, […]
RELATIVE USE OF SECONDARY FORESTS BY CRACIDS INCENTRAL AMAZONIA
Spixs Guan (Penelope jacquacu) Science Article 1 abstract Curassows, guans, and chachalacas (familyCracidae) are large-bodied (400 g to 3500 g)galliform birds found exclusively in the Americas,with most species restricted to SouthAmerica (Delacour & Amadon 1973, delHoyo 1994). Despite their important role inforest dynamics as dispersers of seed plants,most cracid species remain poorly known(Strahl & Grajal […]
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 […]
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 […]
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 […]