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

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Relaciones peces/hábitat en el Guadiamar Spill Effect The ANOVA and post-hoc t-tests between reaches downstream from the Agrio reservoir and each one of the six selected reservoirs, showed significant differences in native species richness between the selected Guadiamar reach and reaches downstream from three reservoirs (Huesna, Rumblar and Fernandina), whereas there were no differences with three others (Cala, Pintado and Montoro) (Table 2). In addition, no significant differences were found between native species diversity downstream from the Agrio reservoir and any of the other six selected reaches. Similarly, no significant differences were found for exotic species. Table 2. p-Values for t-test of native (-na) and exotic (-ex) richness (S) and diversity (H) values between the reach downstream from the Agrio reservoir and reaches downstream from reservoirs in 6 other basins with similar environmental characteristics to the Guadiamar. (* p < 0.05). Cala p Pintado p Huesna p Montoro p Rumblar p Fernandina p S-na 0.07 0.02* 0.17 0.65 0.04* 0.02* H-na 0.95 0.08 0.48 0.82 0.26 0.26 S-ex 0.23 0.06 0.31 0.47 0.46 0.49 H-ex 0.11 0.11 0.55 0.66 0.34 0.35 Fish assemblage longitudinal variation Figure 3 shows how both native fish richness and diversity increased with distance from the source and as the size of main river channel increases. However, when the river reaches the stretch affected by the Agrio reservoir, which is also the area affected by the spill, this native species trend is interrupted. The highest total richness and diversity values were found in this area due to the incorporation of exotic species from these disturbed stretches. Downstream, beyond the reservoir and the area affected by the spill, the lowest total richness and diversity values were detected. Progressively, total richness and diversity values increased again as the river reaches its mouth. 67
Las comunidades de peces del río Guadiamar y el accidente minero de Aznalcóllar a) b) Figure 3. Richness (a) and diversity (b) at the seven sampling sites located in the Guadiamar River main channel. The segmented grey arrow indicates the confluence with the Agrio river (where both reservoir and spill impact start to exert their effects on the Guadiamar main channel). In both figures, the segmented line represents native species (S-na or H-na); the dotted line represents exotic species (S-ex or H-ex); and the sum of native plus exotic species (S-total or H-total) is given by the solid line. 68
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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,
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A mis antiguos compañeros del Grup
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Material and Methods 39 Results 45
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ABSTRACT This PhD Thesis analyzes t
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Las comunidades de peces del río G
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ÁREA DE ESTUDIO Cuenca del río Gu
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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 37 and 38: Las comunidades de peces del río G
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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Appendix 1. Environmental variables
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