Editing Arno (section)

== Ecology ==
The Arno river has been strongly affected by non-native species: over 90% of fish species and 70% of macroinvertebrate species in the area around Florence are alien species.<ref name=":0">{{Cite journal|last1=Haubrock|first1=Phillip J.|last2=Pilotto|first2=Francesca|last3=Innocenti|first3=Gianna|last4=Cianfanelli|first4=Simone|last5=Haase|first5=Peter|date=2021|title=Two centuries for an almost complete community turnover from native to non-native species in a riverine ecosystem|journal=Global Change Biology|language=en|volume=27|issue=3|pages=606–623|doi=10.1111/gcb.15442|pmid=33159701 |bibcode=2021GCBio..27..606H |s2cid=226274730 |issn=1365-2486|doi-access=free}}</ref> These include the [[Wels catfish|European catfish]],<ref name=":1">{{Cite journal|last1=Haubrock|first1=Phillip Joschka|last2=Azzini|first2=Martina|last3=Balzani|first3=Paride|last4=Inghilesi|first4=Alberto Francesco|last5=Tricarico|first5=Elena|date=2020|title=When alien catfish meet—Resource overlap between the North American Ictalurus punctatus and immature European Silurus glanis in the Arno River (Italy)|journal=Ecology of Freshwater Fish|language=en|volume=29|issue=1|pages=4–17|doi=10.1111/eff.12481|s2cid=149848379 |issn=1600-0633|doi-access=free|bibcode=2020EcoFF..29....4H |hdl=2158/1262515|hdl-access=free}}</ref> [[channel catfish]],<ref name=":1" /> [[Crucian carp]],<ref name=":0" /> [[common bleak]],<ref name=":2">{{Cite journal|last1=Balzani|first1=Paride|last2=Gozlan|first2=Rodolphe E.|last3=Haubrock|first3=Phillip J.|date=2020|title=Overlapping niches between two co-occurring invasive fish: the topmouth gudgeon Pseudorasbora parva and the common bleak Alburnus alburnus|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/jfb.14499|journal=Journal of Fish Biology|language=en|volume=97|issue=5|pages=1385–1392|doi=10.1111/jfb.14499|pmid=33460088 |bibcode=2020JFBio..97.1385B |s2cid=224936178 |issn=1095-8649}}</ref> [[Stone moroko|topmouth gudgeon]],<ref name=":2" /> [[New Zealand mud snail]],<ref name=":0" /> and [[Dikerogammarus villosus|killer shrimp]].<ref name=":0" /> The [[Rhithropanopeus harrisii|mud crab]] has been found in the river near Pisa.<ref>{{Cite journal|last1=Langeneck|first1=J.|last2=Barbieri|first2=M.|last3=Maltagliati|first3=F.|last4=Castelli|first4=A.|date=2015-11-18|title=The low basin of the Arno River (Tuscany, Italy) as alien species hotspot: first data about Rhithropanopeus harrisii (Crustacea, Panopeidae)|url=http://siba-ese.unisalento.it/index.php/twb/article/view/15385|journal=Transitional Waters Bulletin|volume=9|issue=1|pages=1–10|doi=10.1285/i1825229Xv9n1p1|issn=1825-229X}}</ref>