las comunidades de peces del río guadiamar y el accidente minero ...

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Condición somática de L. sclateri en el Guadiamar Table 3. Regression (a, b), adjusted correlation coefficients (R 2 adj) and residuals (Kr) of the logtransformed mass-length relationship in each sampling site. Sampling b a Kr Mean CL n R 2 adj site (slope) (the y-intercept) (residuals) Furcal length (mm) G1 20 2.99±0.09 -10.63 ± 0.46 0.996 1.51 0.20 81.3 10.6 G2 174 2.98±0.03 -10.66 ± 0.23 0.996 0.63 0.09 74.3 4.8 G3 41 2.99±0.07 -10.69 ± 0.36 0.994 0.76 0.18 85.4 7.8 G4 33 2.98±0.07 -10.66 ± 0.28 0.976 0.43 0.25 70.0 13.6 G5 106 2.98±0.05 -10.66 ± 0.24 0.992 0.16 0.10 64.9 4.8 G6 66 3.04±0.05 -11.06 ± 0.24 0.996 -0.77 0.20 109.6 22.6 G7 103 3.03±0.03 -10.95 ± 0.17 0.991 -0.38 0.13 84.6 7.7 G8 167 3.04±0.03 -11.04 ± 0.18 0.984 -0.97 0.11 104.6 7.4 A 24 2.99±0.08 -10.69 ± 0.42 0.995 0.49 0.31 65.4 14.5 F 26 2.99±0.07 -10.65 ± 0.39 0.996 1.49 0.27 65.1 10.0 Table 4. ANCOVA analyses of the mass-length relationship in L. sclateri: F-statistics, degrees of freedom (df) and P values. All variables (dependent and covariate) were log-transformed. Furcal length is the covariate. Source of variation F df P Preliminary design (test for interaction) Length 77539.05 1, 759
Las comunidades de peces del río Guadiamar y el accidente minero de Aznalcóllar dominant substrate was negative, whereas it was positive for pH. The multiple regression model with Kr as dependent variable accounted for 62% of the variance. This model highlighted seasonal water flow as the most influential variable for L. sclateri condition (negative relationship, Table 5). Table 5. Multiple regression models used to determine the main environmental predictors of parameter a (y-intercept) and Kr of the mass-length relationships as fish condition indices for L. sclateri in the Guadiamar River. Significant variables in models and their relative weight are shown. (‘***’ p < 0.001 ‘**’ p < 0.01 ‘*’ p < 0.05). (% explained variance = variance explained by each variable according to variance partitioning using the hier.part package). Significant variables (% explained variance) Adjusted R 2 p value Estimate Std. Error t_value Pr(>|t|) pH (53%) 0.17760 0.02529 7.022 0.000416*** Model a Seasonal Water Flow (35%) 0.96 0.00003 -0.07524 0.02277 -3.305 0.016312 * Dominant substrate (11%) -0.04401 0.01076 -4.088 0.006442 ** Model Kr Seasonal Water Flow 0.62 0.00404 -0.9378 0.2354 -3.984 0.00404 ** 48
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DEPARTAMENTO DE ZOOLOGÍA UNIVERSID
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DEPARTAMENTO DE ZOOLOGÍA UNIVERSID
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TITULO DE LA TESIS: LAS COMUNIDADES
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A mi Madre,
Page 11 and 12: A mis antiguos compañeros del Grup
Page 13 and 14: Material and Methods 39 Results 45
Page 15 and 16: ABSTRACT This PhD Thesis analyzes t
Page 17 and 18: Las comunidades de peces del río G
Page 25 and 26: ÁREA DE ESTUDIO Cuenca del río Gu
Page 27 and 28: Área de estudio Figura 1. Cuenca d
Page 29 and 30: Área de estudio farallón del Alja
Page 31 and 32: Área de estudio Principales impact
Page 34: PARTE I: Ictiofauna de la cuenca de
Page 48 and 49: II.1- Habitat quality affects the c
Page 50 and 51: Condición somática de L. sclateri
Page 54 and 55: Table 1. Mean habitat variable valu
Page 66 and 67: II.2- Habitat-fish community relati
Page 68 and 69: Relaciones peces/hábitat en el Gua
Page 76 and 77: Figure 2. Tributary network of the
Page 86: PARTE III: Evolución de la comunid
Page 99 and 100: Table 1. List of the fish species c
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Las comunidades de peces del río G
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Appendix 1. Environmental variables
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