Spatial and temporal differences in migration strategies among endangered European Greater Spotted Eagles Clanga clanga

Summary Understanding connectivity between migratory bird breeding and wintering grounds is essential for range-wide planning of conservation activities. We used GPS tracking to explore the migration of 28 ‘Endangered’ Greater Spotted Eagles, Clanga clanga from three remaining European breeding populations towards their wintering range, and to identify population and sex-specific patterns in selection of wintering sites. The tracked eagles wintered in three continents, 46% in Africa (mostly Eastern Sahel), 43% across southern Europe (mostly Greece) and 11% in Asia (the Middle East). Migratory connectivity was weak (rM = 0.16), and the population spread across the wintering range was large (1,917 km). The three studied populations differed in their migration strategy, with northerly, Estonian breeders all wintering in Southern Europe, and Polish and Belarusian breeders divided between Southern Europe and Africa. Migration strategy was different between Belarusian males and females, with males more likely to winter in Africa than Europe, and on average, migrating 2,500 km further south than females. Migration to Africa took longer, but was partly compensated by higher migration speeds. Greater Spotted Eagles wintered in wetland sites throughout their wintering range, with 15 of 29 birds wintering in internationally or nationally protected sites (including 12 Ramsar sites). Nearly a third of European winterers stayed in the same Greek national park, perhaps indicating a limitation of suitable sites in Europe due to wetland loss or degradation. This highlights the importance of protected wetlands to this species, but also shows their vulnerability to future wetland degradation. Only two of 14 wintering sites in Africa were under protection, showing a potential mismatch between protection of females and males in their wintering grounds.

Ecology of Laridae under conditions of unstable hydrological regime: colony sizes and synchronization of reproduction

The problem of criteria for distinguishing colonies from similar socio-demographic structures (mainly in terms of nesting density) is highly relevant and has remained in the focus of attention of ornithologists for a long time. The synchronization of reproduction in a colony is one of the criteria which require special development. Based on particular works (1972–2005), I present synchronization of the reproduction of gulls in colonies of different sizes. In contrast to previous studies, this paper uses a specially developed Index of Synchronization of Bird Breeding (Isr) to study this phenomenon, making it relatively easy to determine its level. The index distinguishes between different species of birds of this group: 75.7% (white-winged black tern) and 97.6% (black-headed gull) of the total variability of synchronization of breeding birds in colonies. Frequent failure of nesting attempts often causes repeated (compensatory) reproduction, which in the case of a mass manifestation significantly reduces the synchronization of the nesting period in colonies and thus significantly reduces this indicator. It is proved that a higher synchronization of reproduction characterizes small colonies (up to 50 nests). In all species of gulls, the beginning of reproduction in different colonies differs in terms of the appearance of the first eggs by 1–10 days and at the beginning of mass egg-laying – by 1–18 days. To the same extent, they differ in the timing of the hatching of eggs. In small colonies, the total egg-laying period is shorter by 34.9–49.7% compared to larger colonies. My observations show that large colonies are formed by the nesting of several small colonies on one plot. This phenomenon is noticeable during periods of mass re-nesting of birds after a high loss of nests (up to 69.5% or more) because of severe flooding. Differences in the breeding periods of colonies that differ in size appear when several small colonies with different breeding periods of birds are combined into one larger colony. This phenomenon is well detected in the formation of several sub-colonies and in the differences in the timing of reproduction of different parts of a large colony.

Bobolink (Dolichonyx oryzivorus) Declines Follow Bison (Bison bison) Reintroduction on Private Conservation Grasslands

Among the most rapidly declining birds in continental North America, grassland birds evolved with American bison (Bison bison) until bison nearly became extinct due to overhunting. Bison populations have subsequently rebounded due to reintroductions on conservation lands, but the impacts of bison on grassland nesting birds remain largely unknown. We investigated how bison reintroduction, together with other land management and climate factors, affected breeding populations of a grassland bird species of conservation concern, the Bobolink (Dolichonyx oryzivorus). We quantified population changes in Bobolinks over an 18-year period in conservation grasslands where bison were reintroduced, compared with adjacent grasslands grazed by cattle and where hay was harvested after the bird breeding season. Four years after bison reintroduction, the bison population in the study area had doubled, while Bobolink abundance declined 62% and productivity declined 84%. Our findings suggest that bison reintroduction as a conservation strategy may be counterproductive in grassland fragments where overgrazing, trampling, and other negative impacts drive declines in grassland breeding birds. Where bird conservation is an objective, small grassland reserves may therefore be inappropriate sites for bison reintroduction. To maximize conservation benefits to birds, land managers should prioritize protecting grassland birds from disturbance during the bird breeding season.

Report of an extra-pair copulation in the Rufous Hornero, Furnarius rufus (Aves: Furnariidae)

In the last decade, studies in bird breeding biology have shown that infidelity is prevalent in socially monogamous species. Here, we describe an extra-pair copulation (EPC) event in the Rufous Hornero (Furnarius rufus), a socially monogamous bird with year-round territoriality and low levels of extra-pair paternity. Before the EPC, a within-pair copulation (WPC) occurred inside the pair’s territory. The WPC occurred on the ground and between a banded male (ca. 6 years-old) and an unbanded female. Ten minutes later this breeding pair invaded a neighboring territory, presumably to forage. The territorial male was chased back to its territory by an unbanded male neighbor after being detected. The male neighbor was paired with an unbanded female that did not participate in the aggressive interaction. When flying back to its territory the male neighbor copulated with the territorial female on the ground (ie. EPC). The territorial male flew, vocalized, and perched above the male neighbor, interrupting the EPC. The aggressive interaction then ceased as each pair resumed foraging in their respective territories. These observations suggest that Rufous Horneros can use EPC to obtain immediate benefits (food access in a neighbor’s territory). Moreover, WPC may be detected by neighbors and physical mate guarding and/or frequent WPC may be necessary to prevent EPC in the Rufous Hornero.

A plastic device fixed around trees can deter snakes from predating bird nest boxes

Several devices have been designed to prevent predation in nest boxes by mammals and birds. Although snakes are one of the most common predators in cavity–nesters, they have always been difficult to deter. Here we tested a method originally designed to avoid predation by tree–climbing mammals. To prevent snakes from climbing trees and predating on nest boxes, we wrapped a transparent acetate sheet of 80 cm high around tree trunks below a sample of 40 nest boxes used by tits. The acetate sheets were secured with duct tape. The remaining nest boxes (N = 74) in the study area were left as controls. The predation rate in the experimental nest boxes was 20 % and 2 % in control boxes. This method can be useful to increase bird breeding success, improving both the effectiveness of resources to obtain scientific data and the breeding success of endangered species.

A plastic device fixed around trees can deter snakes from predating bird nest boxes

Several devices have been designed to prevent predation in nest boxes by mammals and birds. Although snakes are one of the most common predators in cavity–nesters, they have always been difficult to deter. Here we tested a method originally designed to avoid predation by tree–climbing mammals. To prevent snakes from climbing trees and predating on nest boxes, we wrapped a transparent acetate sheet of 80 cm high around tree trunks below a sample of 40 nest boxes used by tits. The acetate sheets were secured with duct tape. The remaining nest boxes (N = 74) in the study area were left as controls. The predation rate in the experimental nest boxes was 20 % and 2 % in control boxes. This method can be useful to increase bird breeding success, improving both the effectiveness of resources to obtain scientific data and the breeding success of endangered species.

Animal welfare and environmental enrichment in the domestic breeding and ornamental rearing of geese and mallards

The concept of animal welfare has been widely studied and discussed in recent years. This is a science, which seeks an improvement in the quality of life of animals, ensuring that they have the right to their 5 basic freedoms respected. Animal welfare practices seek to have animals express their natural behavior, even when they are in captivity, ensuring their physical and psychological health. Such techniques help in the adaptation of the animal to the environment, especially in captive animals and in breeding. There is a direct relationship between the implementation of animal welfare practices and the ability of them to adapt and have a good quality of life in the environment in which it was inserted. The growing increase in ornamental bird breeding and as pets has revealed the need to study and ensure welfare practices in the rearing of these animals. One of the techniques used to ensure animal welfare is the implementation of different types of environmental enrichments. Environmental enrichment seeks through different techniques and materials to provide more attractive and stimulating environments to animals, allowing interaction between animals and animal-environment, enabling them to enjoy and explore the environment, optimizing the available spaces, providing opportunities for the development of behaviors and natural abilities of the species, reducing the stress caused by space limitation and absence of stimuli. The objective of this work was to relate animal welfare in the implementation of environmental enrichment in two breeding stake of geese and mallards, one for ornamental and domestic purposes, birds being reared as pets. In particular describe the creation, report the implementation of three types of environmental enrichment: food, physical and social, and response of birds after the implementation of this technique of animal welfare promotion. The results of the implementation of food, physical and social environmental enrichment, to improve the well-being of birds, were verified in both breedings, obtaining a positive result. There was an improvement in the behavior of the animals, which is closer to the natural in both groups, attesting to improvement in quality of life and providing physical and psychological well-being to birds.

Importance of The Medical History in The Diagnosis of Hypersensitivity Pneumonitis: A Case Report

Introduction: Hypersensitivity pneumonitis, most frequent types are those related to farming and bird breeding. In this paper, a patient with occupational exposure to metal dusts and welding fumes but diagnosed with HP thanks to the guidance of detailed anamnesis revealing inhalational exposure to pigeon antigens both at home and in workplace Case: 32-year-old male. He applied with shortness of breath, dry cough. He has been working production of kitchen equipment made from stainless steel. When environmental exposures questioned, he declared that he bred up to ten pigeons at the basement of his house and up to fifteen pigeons at a coop next to workplace building. Spirometry revealed restrictive pattern. In patient’s chest X-ray, bilateral increased reticular densities were observed. Computed tomography of thorax revealed radiological findings supporting subacute hypersensitivity pneumonitis such as bilateral diffuse millimetric centrilobular ground-glass nodules which are coalescing in some areas, mosaic perfusion and air trapping in basal areas. Bronchoalveolar lavage cytology revealed percentages of lymphocytes as 85%. Discussion: Detailed anamnesis revealing environmental and occupational inhalational exposures guides the physician in diagnosis of HP. After initial suspicion, supporting laboratory and radiologic findings confirm the diagnosis to provide appropriate management.