Figure 1
Rank-abundance distribution of the copepods of Tirino Springs (Central Italy) in pre-seismic (1997, grey diamonds; 2005, black squares) and post-seismic (2012, red dots) years. Panel a: comparison for all species. Regression statistics for the 1997 pre-seismic community: log(abundance) = (−0.122 ± 0.004) × rank + (2.479 ± 0.044), R² = 0.984, F1,19 = 1190.221, P < 0.0001. Regression statistics for the 2005 pre-seismic community: log(abundance) = (−0.144 ± 0.004) × rank + (3.026 ± 0.045), R² = 0.988, F1,19 = 1593.945, P < 0.0001. Regression statistics for the post-seismic community: log(abundance) = (−0.119 ± 0.007) × rank + (2.478 ± 0.081), R² = 0.941, F1,17 = 255.883, P < 0.0001. The 1997 community followed the lognormal series series but was modelled here for comparative purposes. Panel b: comparison for non-stygobites. Regression statistics for the 1997 pre-seismic community: log(abundance) = (−0.201 ± 0.013) × rank + (2.433 ± 0.094), R² = 0.961, F1,10 = 245.442, P < 0.0001. Regression statistics for the 2005 pre-seismic community: log(abundance) = (−0.205 ± 0.010) × rank + (2.998 ± 0.076), R² = 0.977, F1,11 = 461.579, P < 0.0001. Regression statistics for the post-seismic community: log(abundance) = (−0.175 ± 0.015) × rank + (2.573 ± 0.100), R² = 0.940, F1,9 = 141.585, P < 0.0001. Panel c: comparison for stygobites. Regression statistics for the 1997 pre-seismic community: log(abundance) = (−0.299 ± 0.023) × rank + (2.654 ± 0.127), R² = 0.961, F1,8 = 174.495, P < 0.0001. Regression statistics for the 2005 pre-seismic community: log(abundance) = (−0.422 ± 0.033) × rank + (3.161 ± 0.165), R² = 0.965, F1,6 = 166.370, P < 0.0001. Regression statistics for the post-seismic community: log(abundance) = (−0.307 ± 0.039) × rank + (2.292 ± 0.173), R² = 0.926, F1,5 = 62.997, P = 0.0005. In all cases, errors refer to standard errors.
