Results 171 to 180 of about 6,940 (202)

[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 ...
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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
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Direct Mortality of Birds from Anthropogenic Causes

Annual Review of Ecology, Evolution, and Systematics, 2015
Understanding and reversing the widespread population declines of birds require estimating the magnitude of all mortality sources. Numerous anthropogenic mortality sources directly kill birds. Cause-specific annual mortality in the United States varies from billions (cat predation) to hundreds of millions (building and automobile collisions), tens of ...
Loss, Scott R., Will, Tom, Marra, Peter P.   +2 more
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Monitoring the Application of the Birds and the Habitats Directives

Journal for European Environmental & Planning Law, 2013
The contribution examines the monitoring of the application of Directives 2009/147 on birds and 92/43 on habitats and wild fauna and flora by the EU institutions. It concludes that while without such monitoring, the situation of biodiversity in the EU would be worse, the application of directives and their effects on fauna and flora species is not a ...
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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
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A direct approach to the study of the effect of gravity on axis formation in birds

Advances in Space Research, 1994
A system has been developed to enable the normal development of aborted very early uterine avian embryos, outside the female's uterus. The shell-less aborted egg was put into a foster shell of a sister egg, previously laid by the same female. The empty space between the shell and aborted egg was filled with artificial uterine fluid.
H, Eyal-Giladi, M, Goldberg, H, Refael, O, Avner   +3 more
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Fire enables passive directed seed dispersal by birds

Current Biology
Recent work proposes that passive directed dispersal (PDD) occurs when resource tracking leads animal vectors to disperse seeds at sites that favor plant establishment. For example, wildland fire can attract seed-dispersing animals via the magnet effect while simultaneously generating the environmental conditions that benefit animal-dispersed plants ...
David S, Mason, Kevin M, Robertson, Phillip G, Hahn, Emilio M, Bruna, John L, Willis, Marcus A, Lashley   +5 more
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The Birds Directive

Review of European Community & International Environmental Law, 1997
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Directional Selection and Clutch Size in Birds

The American Naturalist, 1990
Fred Cooke, Peter D. Taylor, Charles M. Francis, Robert F. Rockwell   +3 more
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The sense of direction in migratory birds

Endeavour, 1963
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