Tag: all of Turdus

Photoperiod Experiments on the American Robin

American Robin (Turdus migratorius) Science Article 1 abstract The American Robin of southwestern British Columbia was tested in captivity under four light regimes: LD 8:16, 12:12, 16:8, all under artifical light, and natural daylight increment from LD 12:12 to 16:8. Robins under the latter two regimes gained in gonadal weight and in follicular and seminiferous […]

Behavioral Defenses Against Brood Parasitism in the American Robin (Turdus migratorius)

American Robin (Turdus migratorius) Science Article 3 abstract In response to avian brood parasitism, hosts may develop a number of defenses to reducethe negative consequences parasitism can have on the host’s reproductive success. Thesebehaviors may include aggression towards a parasite, rejection of parasitic eggs, or nestdesertion. Comparisons of populations that are exposed to parasitism and […]

Blue eggs do not reduce nest predation in the song thrush,Turdus philomelos

Song Thrush (Turdus philomelos) Science Article 2 abstract Many passerine birds with open cup-shaped nests lay blue or blue-green eggs. In thrushes, blue eggs may be cryptic and provide camouflage by imitating spots of light on green leaves. Alternatively, egg coloration may be selectively neutral because nest predators detect nests and not eggs, or it […]

Demographic mechanisms of the population decline of the song thrush Turdus philomelos in Britain

Song Thrush (Turdus philomelos) Science Article 3 abstract In Britain, the song thrush Turdus philomelos is categorized as a species of high national conservation concern because of a large population decline during the last three decades. We calculated a series of annual national population estimates for woodland and farmland habitats combined for the period 1964-2000. […]

Post-breeding dispersal, breeding site fidelity and migration/wintering areas of migratory populations of Song Thrush Turdus philomelos in the Western Palearctic

Song Thrush (Turdus philomelos) Science Article 1 abstract Song Thrush Turdus philomelos ring recovery data gathered over 90 years in central, north and east Europe were analysed in their breeding zones and in 14 migration/wintering areas in Europe, North Africa and the Near East. Few post-breeding movements were over 20 km before the end of […]


Ring Ouzel (Turdus torquatus) Science Article 2 abstract The 2008 survey was the ninth year in which a detailed study had been made of the ring ouzel Turdus torquatus torquatus (RZ) population in the North York Moors National Park and continued the work started in 1999 (foot & mouth preventing work in 2001). The findings […]

The decline of the Ring Ouzel Turdus torquatus in Britain: evidence from bird observatory data

Ring Ouzel (Turdus torquatus) Science Article 1 abstract Analysis of British and Irish bird observatory data from 1970-1998 shows that the number of Ring Ouzel Turdus torquatus bird days has declined significantly in spring at western observatories through which British-breeding birds pass, but not at east coast observatories through which Fennoscandian breeders pass. The extent […]

Some factors affecting foraging and habitat of Ring OuzelsTurdus torquatus wintering in the Atlas Mountains of Morocco

Ring Ouzel (Turdus torquatus) Science Article 3 abstract This study aimed to shed light on the role of juniper berries as the principal foodsource for Ring Ouzels Turdus torquatus wintering in Morocco’s Atlas Mountains. Of the twojuniper species surveyed, Prickly Juniper Juniperus oxycedrus was the most widespread, butoccurred at low densities in other types of […]

Do strategies against conspecific brood parasitism occur in Redwings Turdus iliacus?

Redwing (Turdus iliacus) Science Article 1 abstract A significant proportion of Redwings Turdus iliacus reject non-mimetic model Cuckoo Cuculus canorus eggs experimentally introduced into their nests. However, very few cases of Cuckoo parasitism have been recorded for this species. In the present study we tested the hypothesis that egg rejection by Redwings has evolved as […]