Results 291 to 300 of about 717,951 (343)

The genetics of bird migration: stimulus, timing, and direction

Ibis, 1992
The extent to which genetic factors are directly involved in the control of bird migration and the mode of inheritance involved has been studied systematically over the past 15 years in the Blackcap Sylvia atricapilla by cross‐breeding and selective breeding. Results have also been obtained from a few experimental and field studies on Robins Eritfiacus
Berthold, P., Helbig, A.
openaire   +2 more sources

Suburban biodiversity: the importance of a small SPA near Zagreb for riverine birds

Larus godišnjak Zavoda za ornitologiju Hrvatske akademije znanosti i umjetnosti
The Special Protection Area (SPA) Sava near Hrušćica with the Rakitje gravel pit (HR1000002) is one of the smallest SPAs in Croatia. A total of 171 bird species were recorded within the study area, of which 87 were breeding.
Jelena Kralj, Luka Basrek, Tomica Rubinić, Sandra Hodić, K. Mikulić   +4 more
semanticscholar   +1 more source

A direct cerebrocerebellar projection in adult birds and rats

Neuroscience, 2000
The rostral Wulst of birds, like the somatosensory cortex of mammals, receives somatosensory information from the thalamus and projects to the brainstem and spinal cord via a pyramidal-like tract. Using anterograde and retrograde tract-tracers, we show here, in adult zebra finches, that the rostral Wulst also projects directly to the cerebellar cortex ...
J M, Wild, M N, Williams
openaire   +2 more sources

The importance of reservoirs of the upper cascade of the Dnipro for the conservation of rare species of fish and wetland birds

Ecology and Noospherology
Reservoirs of the upper cascade as transformed sections of the Dnipro River perform not only a number of important economic roles, but also play a role in the preservation and reproduction of rare animal species.
M. Prychepa, Yu. O. Kovalenko
semanticscholar   +1 more source

Directional Selection and the Evolution of Breeding Date in Birds

Science, 1988
In many bird species, those pairs that breed earlier in the season have higher reproductive success than those that breed later. Since breeding date is known to be heritable, it is unclear why it does not evolve to an earlier time. Under assumptions outlined by Fisher, a model is developed that shows how breeding date may have considerable additive ...
T, Price, M, Kirkpatrick, S J, Arnold
openaire   +2 more sources

The European community directive on bird conservation

Biological Conservation, 1982
Abstract The Council of the European Community in 1979 adopted a directive and a resolution on bird conservation. The directive imposes legal obligations on EEC member states to take special measures to protect the habitat for migratory species and listed rare species in the most suitable areas throughout the Community. The aim is to set up a network
openaire   +1 more source

Magnetoreception in birds: no intensity window in “fixed direction” responses

Naturwissenschaften, 2009
Under 502 nm turquoise light combined with 590 nm yellow light and in total darkness, European robins, Erithacus rubecula, no longer prefer their migratory direction, but exhibit so-called fixed direction responses that do not show the seasonal change between spring and autumn.
Wolfgang, Wiltschko, Lars, Dehe, Katrin, Stapput, Peter, Thalau, Roswitha, Wiltschko   +4 more
openaire   +2 more sources

[Birds' sense of direction].

Duodecim; laaketieteellinen aikakauskirja, 2016
Birds utilize several distinct sensory systems in a flexible manner in their navigation. When navigating with the help of landmarks, location of the sun and stars, or polarization image of the dome of the sky, they resort to vision. The significance of olfaction in long-range navigation has been under debate, even though its significance in local ...
openaire   +1 more source

Blackhead Disease in Turkeys: Direct Transmission of Histomonas meleagridis from Bird to Bird in a Laboratory Model

Avian Diseases, 2005
The spread of Histomonas meleagridis infections through groups of turkeys in the absence of the cecal worm vector (Heterakis gallinarum) was studied in a battery cage model. Battery-reared poults were exposed at 2 wk of age by commingling with infected birds into cages that had the floor lined with paper.
L R, McDougald, L, Fuller
openaire   +2 more sources

Evaluating theories of bird song learning: implications for future directions

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 2002
Studies of birdsong learning have stimulated extensive hypotheses at all levels of behavioral and physiological organization. This hypothesis building is valuable for the field and is consistent with the remarkable range of issues that can be rigorously addressed in this system.
openaire   +2 more sources