Abstract: | The birds met on our country’s territory constitute an important component part of Romania’s fauna and, in the case of the migratory species, of Europe’s fauna.
At none of a terrestrial or even aquatic group, the phenomenon of seasonal change of place of the populations belonging to different species isn’t so obvious like at birds. The examination of this phenomenon in a place situated at half distance between the equator and pole, that is a middle point like the delta, offered a rich observation material for the elaboration of personal outlooks in this direction (RADU, 1979).
The extremely favorable reproduction conditions and the optimal feeding possibilities, especially in the warm period of the year, make the Danube Delta an attractive biocenosis for the big cormorant. Therefore, the difference between the quantity and the quality of the food from a season to another and the variable way of its accessibility, the variation of the yearly and seasonal climatic conditions, have as consequence a special aviphenological dynamics. |
