Fine-scale analysis of heavily invaded Italian freshwater fish assemblages  

作　　者：Annamaria NOCITA Elena TRICARICO Sandro BERTOLINO 

机构地区：[1]Natural History Museum,Section of Zoology“La Specola,”University of Florence,Firenze,Italy [2]Department of Biology,University of Florence,Firenze,Italy [3]Department of Agriculture,Forest and Food Sciences,Grugliasco,Italy [4]Department of Life Sciences and Systems Biology,University of Turin,Torino,Italy University of Turin,Italy

出　　处：《Integrative Zoology》2017年第6期500-511,共12页整合动物学（英文版）

摘　　要：Inland waters are highly vulnerable to the introduction and spread of non-native species,due to heavy human use of aquatic ecosystems and the natural linkages among streams and lakes.This is particularly noticeable in freshwater fish communities.To better evaluate how these communities are affected by non-native species intro­ductions,we conducted a fine-scale analysis of the changes in Italian freshwater fish assemblages after species introduction.For this analysis,we collected information on fish species present in 44 basins.The present Ital­ian freshwater fish fauna is composed of 48 native and 41 established introduced species,while a further 15 in­troduced species have been reported but are not yet considered naturalized.The changes in the fish assemblages mostly took place in the past 2 centuries and have increased recently,with nearly 60%of the species introduced in the past 3 decades.The number of species introduced per basin ranged from 0 to 35(mean 10.85±7.77 spe­cies/basin),and in 10 basins the number of species introduced is now equal to or even higher than the number of native species.In the past,introduced species mainly originated from America,but over the past three de­cades,an increase of introductions from other parts of Europe and Asia has been recorded.Our results show that basins already rich in native species tend to become even richer as a consequence of the establishment of intro­duced species.This confirms the trend toward a biotic homogenization of ecosystems even at a local scale,due to an increase in the human-mediated spread of generalist species.

关 键 词：biological invasions ICHTHYOFAUNA ITALY non-native species species introductions 

分 类 号：R73[医药卫生—肿瘤]