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Table 1 Relative importance coefficients for cluster analysis

From: Temporal structure of the peritrich ciliate assemblage in a large Neotropical lake

Species Winter Spring Fall Days of exposal Water temperature pH Chlorophyll Total solids Dissolved oxygen Conductivity Turbidity Total P
Cluster 1             
Epistylis sp. 3 −0.947 −0.339 0.412 0.658 −0.887 0.024 0.696 −0.124 0.519 0.793 −0.239 −0.270
Thuricola folliculata −0.860 −0.647 0.162 0.032 −0.924 0.436 0.596 −0.128 0.046 0.657 −0.445 −0.655
Epistylis sp. 1 −0.298 −0.226 0.697 0.999 −0.265 −0.015 0.507 −0.297 0.202 0.323 −0.105 −0.314
Opercularia minima −0.547 −0.134 0.099 0.323 −0.436 −0.126 0.633 0.204 0.195 −0.132 0.591 −0.669
Opercularia racemosa −0.920 −0.025 0.708 1.000 0.369 −0.694 −0.192 0.812 0.977 −0.218 −0.102 0.035
Vaginicola tincta −0.920 −0.783 0.803 0.948 −0.805 0.103 0.438 −0.066 0.929 −0.528 −0.319 0.478
Rhabdostyla ovum −0.358 0.858 −0.263 0.648 0.113 0.678 0.480 −0.973 0.536 0.664 0.928 0.803
Vorticella campanula −0.172 0.192 −0.451 0.350 −0.226 −0.050 −0.443 −0.897 0.427 0.838 0.900 0.035
Vorticella chlorostigma −0.621 −0.513 −0.680 0.103 0.417 −0.851 0.172 −0.462 0.570 0.705 0.094 0.804
Epistylis sp. 2 −0.793 −0.729 −0.238 −0.428 −0.764 −0.707 −0.113 0.813 0.519 0.573 −0.160 −0.926
Vorticella convallaria −0.893 −0.840 −0.194 −0.493 −0.419 −0.682 0.176 0.437 0.306 0.311 0.800 −0.986
Platycola decumbens −0.174 −0.578 0.069 −0.854 0.605 0.999 −0.094 0.037 0.277 −0.154 0.200 −0.957
Pyxicola carteri −0.936 −0.446 −0.163 0.028 −0.098 0.826 −0.118 0.676 0.929 0.096 0.211 −0.988
Vorticella microstoma −0.192 −0.388 −0.455 −0.769 −0.033 0.300 −0.894 −0.677 0.522 −0.363 0.929 −0.747
 Average cluster 1 −0.616 −0.328 0.036 0.182 −0.240 0.017 0.132 −0.046 0.497 0.255 0.234 −0.357
Cluster 2             
Carchesium polypinum −0.250 0.988 0.995 0.876 0.438 −0.668 0.968 0.579 0.644 0.526 −0.092 −0.797
Epistylis sp. 4 0.723 0.619 0.978 0.997 0.261 −0.397 0.486 0.324 −0.542 0.444 −0.833 −0.412
Opercularia elongata 0.498 0.975 0.931 0.955 0.881 −0.356 −0.249 0.160 0.813 −0.624 −0.165 −0.181
Epistylis plicatilis 0.997 0.778 0.769 0.701 0.460 −0.019 −0.412 0.712 −0.996 −0.767 −0.732 0.363
Haplocaulus distinguendus 0.246 0.722 0.436 −0.085 −0.071 0.500 0.630 −0.561 0.026 0.156 0.545 −0.807
Myoschiston duplicatum −0.641 0.856 0.866 0.310 0.745 0.743 0.375 0.107 0.529 0.923 0.871 −0.856
Cothurnia annulata 0.927 0.150 0.967 0.005 −0.282 0.513 −0.900 −0.231 −0.824 0.214 0.776 −0.880
Zoothamnium arbuscula 0.872 0.096 0.989 −0.985 −0.706 −0.849 0.590 −0.582 −0.963 −0.385 0.629 −0.983
 Average cluster 2 0.421 0.648 0.866 0.347 0.216 −0.067 0.186 0.063 −0.164 0.061 0.125 −0.569
t test (p) 0.001 0.000 0.000 0.586 0.070 0.756 0.836 0.645 0.045 0.444 0.696 0.294
  1. RIC = (1 − P) × B/mod(B), where P is the significance value for each regression coefficient B, and mod represents the modulus of the B value as estimated by multiple linear regression coefficients relating to peritrich species abundance (standardized (ln + 1) values) with seasons and water quality parameters (significant values are italicized, P < 0.05). Data obtained between June 2010 and June 2011 for Guaíba Lake, southern Brazil. Species are presented in the same order as in the cluster analysis (Figure 5). t test compares species from clusters 1 and 2.