Outline of Bionomical Evaluation of Fauna
摘要
Even with regards to the faunal component, bionomic studies on the landscape bring both conceptual and methodological innovations, even if there is, at present, a more limited number of examples on this approach. Animals play a vital role in structuring the landscape too. Those who have had the opportunity to observe the behavior of the most critical animal populations in the large African parks have realized that animals act on the structure of the landscape in two main ways: (a) as users of resources, (b) as an engineer species. On the other side, the significant effects of fragmentation on fauna are, in decreasing order: isolation, increase in generalists and multi-habitat species, edge species, nest predation and the rate of extinction. A study of European Environment Agency demonstrates a very significant law: up to 9 fragmentation elements per 1000 km2, the survival of large mammal populations is possible, but if the density increases from 9 to 14, survival drops from 80 to 20%. In accordance with what was stated for vegetation, a new method of studying the animal component is being developed, which will be called “LaBiSf.” This method currently studies faunal sensitivity and the Standard Habitat (SH) per individual in the Natural habitat (NH). But Urbanized landscapes may contain hundreds of wild species, too. In the Western World, the most common animal species living in towns are found in Europe and North America, Detecting the presence of invertebrates, through pit traps, the level of ecological efficiency of a restored green tessera (Ts), after 2–3 years of green planting, can be compared to the natural ones: the results of an investigation to measure the validity of a LU restoration in a mining area are shown. Then, in summary, the effects of the bark beetle epidemic on Picea forests are presented. The epidemic broke out after the destruction of the Vaia storm (October 2018), which felled from 15 to 35% of the trees in a few hours (wind with gusts of 200–220 km/h). The abnormal quantity of dead wood has multiplied the populations of Ips typographus, which are now causing perhaps more damage than the storm itself, even if their numbers are starting to decrease.