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Table 2 Biomass subtracted by M. salmoides to the predator Perca fluviatilis and the forage fish Atherina boyeri in the North and South littoral lake area of Lake Bracciano (Italy) according to our sampling effort, i.e. according to the mean standing biomass of M. salmoides sampled

From: A novel approach to quantifying trophic interaction strengths and impact of invasive species in food webs

  Biomass Loss (g) Potential Economic Loss per year (€)
NORTH P. fluviatilis (f) A. boyeri (b) Sum (f + b) P. fluviatilis A. boyeri Sum (f + b)
Predation (P) 5244 ± 178 9918 ± 337 15,162 ± 515 283.2 ± 6.9 178.2 ± 6.3 461.4 ± 13.2
Competition (C) 4096 ± 148 320 ± 11 4416 ± 159 221.1 ± 8.1 5.7 ± 0.3 226.8 ± 8.4
Total (P + C) 9340 ± 326 10,238 ± 348 19,578 ± 674 504.3 ± 15.0 183.9 ± 6.6 688.2 ± 21.6
SOUTH       
Predation (P) 0 0 0 0 0 0
Competition (C) 2321 ± 161 1078 ± 76 3399 ± 237 125.4 ± 8.7 19.5 ± 1.5 144.9 ± 10.2
Total (P + C) 2321 ± 161 1078 ± 76 3399 ± 237 125.4 ± 8.7 19.5 ± 1.5 144.9 ± 10.2
  1. The effect of competition and predation is reported
  2. The values of biomass are converted to a potential economic loss per year according to a commercial value of 18 € Kg−1 for P. fluvatilis and 6 € Kg−1 for A. boyeri and the estimated biomass turn-over rate of M. salmoides (see methods)