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

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Análisis del proceso de recolonización del tramo afectado del Guadiamar Figure 3. Species richness dynamics for natives (left) and exotics (right) at the reference (E1) and affected (E2-E5) sites following the April 1998 spill. Fish diversity increased in each sampling site during the two years following the spill, especially in the affected reach (except in E5; Fig. 4). After this initial recovery, a second stable phase followed (2001-2004), with constant diversity values. However, from 2005 onwards, started a third fluctuating phase, with maximum values in E2 in 2011. Figure 4. Species diversity (H´) dynamics at the reference (E1) and affected (E2-E5) sites following the April 1998 spill. During this study, at least three different phases could be distinguished for fish abundance trends in the affected sites. First, early spill removal works resulted in an increase from the lowest initial values (1999) to a maximum in the second year after the spill (2000), reaching similar abundance values between the reference and the affected 89
Las comunidades de peces del río Guadiamar y el accidente minero de Aznalcóllar sites (Fig. 5). However, in 2001 native species abundance, and especially that of exotics, decreased to a minimum. Between 2002 and 2004, there was a stable phase for both native and exotic species in most sampling sites, with a slight increase for natives. The third phase could be considered the fluctuating trend that sampling sites underwent from 2005 to 2006, when each sampling site showed different trends in native and exotic species abundance. Finally, the last sampling in 2011 showed how exotic species abundance mightily increased in the affected reach and decreased to a minimum in the reference site, resulting in higher values for exotic species in the affected reach than in the reference site at the end of the study period. On the contrary, native species abundance in the reference site remained above that in the affected reach. Figure 5. Fish abundance dynamics for natives (left) and exotics (right) at the reference (E1) and affected (E2-E5) sites following the April 1998 spill. 90
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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
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Área de estudio farallón del Alja
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Área de estudio Principales impact
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PARTE I: Ictiofauna de la cuenca de
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II.1- Habitat quality affects the c
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Condición somática de L. sclateri
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Appendix 1. Environmental variables
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