| Abstract | We provide a comprehensive overview of the status of fish assemblages in eight Italian subalpine lakes using multiple data sources: historical records, standardised sampling and fishery catch statistics. Thirty-four fish species were recorded, twenty of which are native, seven introduced historically and another seven introduced recently. The number of fish species in individual lakes has increased by between 25 and 65% from 1855 to the present, with the increase being higher in the larger lakes. Non-native species contributed between 4.0 and 71.5% to standardised catches by numbers and between 4.8 and 65.1% by biomass. Roach Rutilus rutilus and pumpkinseed Lepomis gibbosus dominated electrofishing and benthic catches by number, while open-water catches were dominated by the coregonids European whitefish Coregonus lavaretus and gangfish Coregonus macrophthalmus. In terms of biomass, electrofishing catches were dominated by crucian carp Carassius carassius, largemouth bass Micropterus salmoides and wels catfish Silurus glanis, benthic catches were dominated by roach, European whitefish and crucian carp, and open-water catches by coregonids. Commercial fisheries are important ecosystem services provided by subalpine lakes, with their harvests now dominated by non-native species. To deliver effective biodiversity conservation and ecosystem services provision, the prioritisation of targets and interventions of management of non-native species is needed. |
| Text | 399520 2018 10.1007/s10750 018 3621 0 Scopus 2 s2.0 85046036713 ISI Web of Science WOS 000448578500015 Climate change CPUE Gillnet Electrofishing Fish biodiversity Fish assemblages in deep Italian subalpine lakes history and present status with an emphasis on non native species Volta P.; Jeppesen E.; Sala P.; Galafassi S.; Foglini C.; Puzzi C.; Winfield I.J. CNR Institute of Ecosystem Study, L.go Tonolli 50, Verbania Pallanza, 28922, , Italy; Department of Bioscience, Aarhus University, Vejlsøvej 25, Silkeborg, 8600, , Denmark; Sino Danish Centre for Education and Research, Beijing, , China; GRAIA srl Gestione e Ricerca Ambientale Ittica Acque, Via Repubblica, 1, Varano Borghi, Varese, 21020, , Italy; Lake Ecosystems Group, Centre for Ecology Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster, Lancashire, LA1 4AP, , United Kingdom We provide a comprehensive overview of the status of fish assemblages in eight Italian subalpine lakes using multiple data sources historical records, standardised sampling and fishery catch statistics. Thirty four fish species were recorded, twenty of which are native, seven introduced historically and another seven introduced recently. The number of fish species in individual lakes has increased by between 25 and 65% from 1855 to the present, with the increase being higher in the larger lakes. Non native species contributed between 4.0 and 71.5% to standardised catches by numbers and between 4.8 and 65.1% by biomass. Roach Rutilus rutilus and pumpkinseed Lepomis gibbosus dominated electrofishing and benthic catches by number, while open water catches were dominated by the coregonids European whitefish Coregonus lavaretus and gangfish Coregonus macrophthalmus. In terms of biomass, electrofishing catches were dominated by crucian carp Carassius carassius, largemouth bass Micropterus salmoides and wels catfish Silurus glanis, benthic catches were dominated by roach, European whitefish and crucian carp, and open water catches by coregonids. Commercial fisheries are important ecosystem services provided by subalpine lakes, with their harvests now dominated by non native species. To deliver effective biodiversity conservation and ecosystem services provision, the prioritisation of targets and interventions of management of non native species is needed. 824 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 85046036713 partnerID=q2rCbXpz Article articolo Volta et al. 2018 Hydrobiol.pdf Articolo in rivista Kluwer 1573 5117 Hydrobiologia Dordr., Online Hydrobiologia Dordr., Online Hydrobiologia Dordr., Online Hydrobiologia. Dordr., Online Hydrobiologia Dordrecht Dordr., Online Hydrobiologia Boston Dordr., Online Hydrobiologia London Dordr., Online SALA PAOLO FOGLINI CLAUDIO silvia.galafassi GALAFASSI SILVIA pietro.volta VOLTA PIETRO |
