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

Safi, Lúcia SL; Fontoura, Nelson F; Severo, Henrique J; Utz, Laura RP

doi:10.1186/s40555-014-0017-3

Zoological Studies

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

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.

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