| Abstract | We examined fossil Cladocera (Crustacea) communities and their functional assemblages in a ~60-year sediment record from Lake Maggiore, northern Italy. Our main objective was to document the response of aquatic community functioning to environmental stress during eutrophication (1960-1985) and recovery (post-1985), and to identify environmental controls on cladoceran functionality. Of the functional groups, large filter feeders and oval epibenthos thrived prior to eutrophication (reference conditions pre-1960) and globular epibenthos and small filter feeders increased during eutrophication and as the lake recovered. Multivariate analyses suggested that bottom-up controls (i.e., total phosphorus) were important for shaping functional assemblages but taxonomic community changes were likely related to top-down control by predators, particularly the predaceous cladoceran Bythotrephes longimanus. Functional diversity (FD) was higher and Daphnia ephippia length (DEL) larger during the reference and early eutrophication periods and decreased during eutrophication and recovery. Both FD (high) and DEL (large) were distinct during reference period, but were similar (FD low, DEL small) between the eutrophication and recovery periods. The functional attributes and the assemblages did not recover post-eutrophication, suggesting that the system exhibited a clear shift to low FD and dominance of small filterers. Cladoceran functionality appears to be related to fundamental ecosystem functions, such as productivity, and may thus provide insights for long-term changes in ecological resilience. |
| Text | 384509 2018 10.3390/w10010086 Scopus 2 s2.0 85040771981 Biodiversity Ecological resilience Environmental change Fossil Cladocera Functional diversity Paleolimnology Subalpine lakes Sedimentary record of cladoceran functionality under Eutrophication and re oligotrophication in Lake Maggiore, Northern Italy Nevalainen L.; Brown M.; Manca M. Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Niemenkatu 73, Lahti, 15140, , Finland; Department of Biology, Hobart and William Smith Colleges, 4095 Scandling Center, Geneva, NY, 14456, , United States; CNR Institute of Ecosystem Study, Largo Tonolli 50, Verbania, 28922, , Italy We examined fossil Cladocera Crustacea communities and their functional assemblages in a 60 year sediment record from Lake Maggiore, northern Italy. Our main objective was to document the response of aquatic community functioning to environmental stress during eutrophication 1960 1985 and recovery post 1985 , and to identify environmental controls on cladoceran functionality. Of the functional groups, large filter feeders and oval epibenthos thrived prior to eutrophication reference conditions pre 1960 and globular epibenthos and small filter feeders increased during eutrophication and as the lake recovered. Multivariate analyses suggested that bottom up controls i.e., total phosphorus were important for shaping functional assemblages but taxonomic community changes were likely related to top down control by predators, particularly the predaceous cladoceran Bythotrephes longimanus. Functional diversity FD was higher and Daphnia ephippia length DEL larger during the reference and early eutrophication periods and decreased during eutrophication and recovery. Both FD high and DEL large were distinct during reference period, but were similar FD low, DEL small between the eutrophication and recovery periods. The functional attributes and the assemblages did not recover post eutrophication, suggesting that the system exhibited a clear shift to low FD and dominance of small filterers. Cladoceran functionality appears to be related to fundamental ecosystem functions, such as productivity, and may thus provide insights for long term changes in ecological resilience. 10 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 85040771981 partnerID=q2rCbXpz Articolo 2018_Water_10_86.pdf Articolo in rivista Molecular Diversity Preservation International 2073 4441 Water Basel Water Basel Water Basel Water. Basel marinamarcella.manca MANCA MARINA MARCELLA |
