Non-native Fish Occurrence and Biomass in 1943 Western Palearctic Lakes and Reservoirs and their Abiotic and Biotic Correlates

作者：Trochine Carolina; Brucet Sandra; Argillier Christine; Arranz Ignasi; Beklioglu Meryem; Benejam Lluis; Ferreira Teresa; Hesthagen Trygve; Holmgren Kerstin; Jeppesen Erik; Kelly Fiona; Krause Teet; Rask Martti; Volta Pietro; Winfield Ian J; Mehner Thomas^*

来源：Ecosystems, 2018, 21(3): 395-409.

DOI：10.1007/s10021-017-0156-6

• invasion biology
• lake fish communities
• translocated species
• exotic species
• invasion meltdown
• trophic similarity

Invasion of non-native species is considered a major threat to global biodiversity. Here we present a comprehensive overview of the occurrence, richness and biomass contribution of non-native fish species in 1943 standing water bodies from 14 countries of the Western Palearctic, based on standardised fish catches by multi-mesh gillnetting. We expected strong geographical gradients to emerge in the occurrence of non-natives. We further hypothesised that the contribution by non-natives to the local fish community biomass was correlated with local richness and the trophic level of native and non-native species. Non-native fish species occurred in 304 of 1943 water bodies (16%). If the average number of occupied water bodies per country was weighted by number of water bodies per country, the grand mean occurrence of non-natives in Western Palearctic water bodies was 10%. Exotic (non-native to the Palearctic) and translocated (non-native only to parts of the Palearctic) species were found in 164 (8.4%) or 235 (12.1%) of the water bodies, respectively. The occurrence and local richness of non-native fish species increased with temperature, precipitation and lake area and were substantially higher in reservoirs than in natural lakes. High local biomass contributions of non-native species were strongly correlated with low richness of native species and high richness of non-native species, whereas the trophic level of the fish species had only a weak effect. Single non-native species rarely dominated community biomass, but high biomass contributions and thus strong community and ecosystem impacts can be expected if several non-native species accumulate in a water body.

• 出版日期2018-4