Water Rail (Rallus aquaticus) Science Article 2 abstract Along a transect from just north of Uppsala (c. 60 deg ?N) to Lulea (c. 65 deg 30′ N), the eastern coast of Sweden, we searched for Water Rails Rallus aquaticus. Rails were found at four of twenty-four visited sites, the northernmost site at 61 deg 08′ […]
Category: Eurasia
New material supplies in the Marsh Harrier Circus aeruginosus sexual roles daily and seasonal activity patterns and rainfall influence
Western Marsh Harrier (Circus aeruginosus) Science Article 5 abstract Nest maintenance is an important part of parental care for the Marsh Harrier Circus aeruginosus throughout the entire breeding period. Nest material supply trips are mainly carried out by the female as the male only contributes during incubation and the early nestling period. The trips rate […]
Main migratory direction of Marsh HarrierCircus aeruginosus: an analysis of recovery data ofspecimens ringed in Latvia from 1925 to 2004
Western Marsh Harrier (Circus aeruginosus) Science Article 1 abstract Th is paper describes the main migratory directions of the Latvian Marsh Harrier Circus aeruginosuspopulation and provides an overview of recovery data. Th e study was based on analysis of recoverydata of Marsh Harrier that were ringed in Latvia from 1925 to 2004 and subsequently recovered.In […]
Reproduction of the Marsh Harrier Circus aeruginosus in recent land reclamations in The Netherlands.
Western Marsh Harrier (Circus aeruginosus) Science Article 6 abstract We studied temporal variation in reproductive performance of Marsh Harriers Circus aeruginosus in two land reclamations in The Netherlands, i.e. South Flevoland and the Lauwersmeerpolder, embanked in 1968 and 1969 respectively. The number of breeding pairs in Flevoland rapidly increased to a maximum of 350 pairs […]
The impact of grazing animals on nesting success of grassland passerines in farmland and natural habitats: a field experiment
Water Pipit (Anthus spinoletta) Science Article 1 abstract A study was made of the influence of trampling by grazing animals on the nesting success of real nests (meadow pipit, Anthus pratensis; water pipit, Anthus spinoletta; and skylark, Alauda arvensis) and simulated nests (caps from jam-jars filled by green plasticine) on pasture in the Orlicke Mountains […]
Territory quality and reproductive success: Can water pipits Anthus spinoletta assess the relationship reliably?
Water Pipit (Anthus spinoletta) Science Article 2 abstract Variation in avian reproductive success is often caused by differences among territories in food supply, safety from predators and microclimatic conditions at the nest. Yet, in some habitats these components of territory quality, and hence future reproductive success, are difficult to assess at the time of settlement. […]
TUFTED PUFFINS (FRATERCULA CIRRHATA) RESPOND TOPREDATION DANGER DURING COLONY APPROACH FLIGHTS
Tufted Puffin (Fratercula cirrhata) Science Article 2 abstract In spite of their putative importance in the evolution of certain traits (e.g., nocturnality, coloniality, cliff nesting), the effects of aerial predators on behaviorof adult seabirds at colonies have been poorly investigated. We hypothesized that Tufted Puffins (Fratercula cirrhata) respond to danger posed by aerial predators by […]
Ornaments and overflight behaviour of Tufted Puffins (Fraterculacirrhata) breeding on Triangle Island, British Columbia.
Tufted Puffin (Fratercula cirrhata) Science Article 3 abstract Tufted puffins (Fratercula cirrhata) are unusual among seabirds in that they bearmultiple colourful ornaments during the breeding season. They also engage in colony overflights when approaching the colony with food for their chicks. Blackburn, G., Simon Fraser University, Burnaby, BC. 74 pp Download article download full text […]
Nestling growth and parental provisioning of Tufted Puffins (Fratercula cirrhala) on Triangle Island, British Columbia
Tufted Puffin (Fratercula cirrhata) Science Article 1 abstract I studied the reproductive performance of tufted puffins (Fratercula cirrhata) on TriangleIsland, British Columbia during two years when reproduction was successful. Completereproductive failures are common for this population. I report on the timing of breeding, nestling growth, fledging behaviour, nestling diet, and parental provisioning, and discuss the […]
Nonlinear phenomena and song evolution in Streptopelia doves
Turtle-Dove (Streptopelia turtur) Science Article 1 abstract The production of complex bird song is commonly achieved through neuromuscular activity of respiratory,syringeal and craniomandibular systems. According to nonlinear dynamics theory, however, complexity can also emergespontaneously from very simple and deterministic systems, without any external control. Thus far, studies linking bird songcomplexity with nonlinear dynamics are very […]