Impatto dei predatori lungo un gradiente forestale di urbanizzazione in Danimarca

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[automatically translated] Along an urbanization gradient that goes from the forest, dominated by Fagus sylvatica, the fragments of the original forest in the urban park Sorø south of Denmark (Island Zealand), the beetles ground beetles do not show a decrease in their overall diversity, but species that they have a preference for the forest decline (Magura & al. 2010 Global Ecol. Biogegoraphy). Seeking an explanation for this anomaly, we analyzed the rates of predation and competition in different habitats at different levels of urbanization. To this end a new method has been used (Howe & al. 2009, Entomol. Exp. Appl.), Which consists in the provision of artificial larvae of lepidopteran green plasticine that are exposed for 24 hours in different habitats. Many predators do not recognize that it is an artificial prey, and leave bites on clay. As it regards the analysis of the interspecific competition has been prepared of the food on the plates, where the occupation of the food indicates the presence of competitors. The predation rate in the first two months of spring was variable, but generally high (15-50%) in all the three types of habitat. They were identified beetles, ants, small mammals and birds as predators more frequent. The intensity of predation of small mammals was highest in the suburban area. They are also predators of ground beetles, indicating that the scarcity of ground beetles in suburbanei habitat can be attributed to the attivita high in this group. E 'indicates a competing estimate mainly ants (Formicidae).
Original languageItalian
Number of pages1
Publication statusPublished - 2010

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