Finding of Aphelocheirus aestivalis Fabricius 1794 in the River Chiese,Villanuova sul Clisi(Brescia,Italy)

摘要

cqvip:The finding of Aphelocheirus aestivalis in River Chiese,in a residential area of Villanuova sul Clisi(BS),during a monitoring,gave an occasion for a research about ecology of species,particularly rare in Italy.The research purpose was to inquire about distribution of A.aestivalis in Italy and in Europe,about its ecology and habitats,about possible relation between the finding and the ecological peculiarities of Chiese.The record is particularly unexpected because,although the abundance in the site and good water quality as results from dissolved oxygen and electric conductivity,the macroinvertebrate assemblage has a very low diversity and total absence of particular species and the prevalence of tolerant species,its preferred preys.A.aestivalis was found,according to the most of fragmentary and sporadic studies in Italy,just in reduced flow watercourses and it is not clear if there is a connection between its ecological needs and its finding in the site,with not optimal ecological conditions.The reflection is about the role of Aphelocheirus in biological monitoring,independently of low specific diversity,potentially associate to others environmental factories(for example,the geology of watercourse basin)and the necessity of conservation in itself for the sites that host Aphelocheirus aestivalis.