As field determinations take much effort, it would be useful to be able to predict easily the
coefficients describing the functional response of free-living predators, the function relating …

Information about when and where animals die is important to understand population
regulation. In migratory animals, mortality might occur not only during the stationary periods (eg …

The use of artificial nest boxes has led to significant progress in bird conservation and in our
understanding of the functional and evolutionary ecology of free-ranging birds that exploit …

Worldwide, Germany is the leading country in the use of wind energy. Since sites for the
erection of wind turbines became scarce on land, ambitious plans for the offshore regions have …

Climate change encompasses changes in both the means and the extremes of climatic
variables, but the population consequences of the latter are intrinsically difficult to study. 2. We …

The Arctic is entering a new ecological state, with alarming consequences for humanity.
Animal-borne sensors offer a window into these changes. Although substantial animal tracking …

Knowledge about migratory connectivity, the degree to which individuals from the same
breeding site migrate to the same wintering site, is essential to understand processes affecting …

The behavioural rhythms of organisms are thought to be under strong selection, influenced
by the rhythmicity of the environment 1 , 2 , 3 , 4 . Such behavioural rhythms are well studied …

Migrating birds are believed to minimize the time spent on migration rather than energy. Birds
seem to maximize migration speed in different ways as a noteworthy variation in migration …

Herbivorous birds are hypothesized to migrate in spring along a seasonal gradient of plant
profitability towards their breeding grounds (green wave hypothesis). For Arctic breeding …