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Among the vertebrate fauna, birds are the most abundant group in all the natural environments of our country. The rivers, far from being an exception, are home to many bird species: some are going to eat, nest or rest, others follow the course of the river as a migratory route between the European and African continents.
The Blauet finds in our latitudes a temperature and conditions that are ideal for residing throughout the year, especially in rivers and other masses of water.
The presence of birds in the rivers is very clear in winter. The leafy trees let us see these inhabitants, which are also more abundant and, in general, larger in size than those that usually exist during the longest time. In the spring and summer, however, they do not look so much but they feel like singing a lot because the leaves protect them.
Global warming in recent decades is causing significant changes in the structure and functioning of natural systems. In the particular context of the Mediterranean region, it is difficult to identify changes in rivers related to climate change because these are already highly regulated and altered by excessive catchments and diverse infrastructures. Leaving that aside, recent studies seem to indicate that low-flow situations in rivers and the frequency of extreme events, from droughts to floods, are already on the rise. In the case of birds, nuptial songs and reproductive activity are already detected one or two weeks in advance and migrations with advances and delays.
This can lead, for example, to poor synchronization with the availability of food, whether it is of plant (fruit) or animal origin (emergence of aquatic insects, amphibian activity, rodents, other bird species, etc.).