Research Article
Planktonic Rotifers in a Subtropical Shallow Lake: Succession, Relationship to Environmental Factors, and Use as Bioindicators
Table 3
GAMs generated by the forward and backward stepwise selection procedure.
| | Response variables | Explanatory variables selected by stepwise procedure | Explained variance (%) |
| | Total | s(chl.a) + s(NO2-N) + s(NO3-N) + s(TN) + s(SRP) + s(CODMn) + s(Tem) | | | An. fissa | s(chl.a) + s(NO2-N) + s(NO3-N) + s(TN) + s(CODMn) + s(Tem) | | | Asc. Saltans | s(NH4-N) + s(TN) + s(Tem) | | | Asp. priodonta | s(NH4-N) + s(NO2-N) + s(NO3-N) + s(Tem) | | | B. angularis | s(NO2-N) + s(NO3-N) + s(SRP) + s(Tem) | | | B. budapestinensis | s(NH4-N) + s(NO3-N) + s(TP) | | | B. calyciflorus | s(NH4-N) + s(NO3-N) + s(Tem) | | | B. diversicornis | s(NO2-N) + s(SRP) + s(CODMn) + s(Tem) | | | B. forficula | s(chl.a) + s(NO2-N) + s(NO3-N) + s(CODMn) + s(Tem) | | | Ce. inquilina | s(chl.a) + s(NH4-N) + s(NO2-N) + s(NO3-N) + s(Tem) | | | E. senta | s(NH4-N) + s(NO2-N) + s(NO3-N) + s(TN) + s(Tem) | | | F. longiseta | s(CODMn) + s(Tem) | | | F. terminalis | s(NO3-N) + s(TN) + s(TP) + s(CODMn) + s(Tem) | | | H. mira | s(NO2-N) + s(SRP) + s(CODMn) + s(Tem) | | | K. cochlearis | s(NO3-N) + s(Tem) | | | K. quadrata | s(chl.a) + s(NH4-N) + s(NO3-N) + s(Tem) | | | K. ticinensis | s(NO3-N) + s(SRP) + s(TP) + s(CODMn) + s(Tem) | | | K. valga | s(chl.a) + s(NO2-N) + s(NO3-N) + s(TN) + s(Tem) | | | L. elachis | s(chl.a) + s(TN) + s(CODMn) + s(Tem) | | | P. dolichoptera | s(CODMn) + s(Tem) | | | Po. complanata | s(chl.a) + s(NO2-N) + s(CODMn) + s(Tem) | | | Tr. longiseta | s(chl.a) + s(TN) + s(CODMn) | | | Tr. pusilla | s(chl.a) + s(NO3-N) + s(TN) + s(Tem) | |
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The GAM formula is ln(densities + 1) ~ s(chl.a) + s(NO2-N) + s(NO3-N) + s(TN) + s(SRP) + s(CODMn) + s(Tem).
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