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

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Condición somática de L. sclateri en el Guadiamar 2008) and the marsh area (Drake et al., 1999). This paper addresses the mid-term effects of the spill by exploring the relationship between current habitat variables and fish condition. The analysis of fish condition is standard practice in the management of fish populations as a measure of both individual and cohort fitness (Jakob et al., 1996). Condition measures are useful as indicators of tissue energy reserves and may reflect the environment in which fish live (e.g., habitat, prey availability, competition) (Vila- Gispert and Moreno-Amich, 2001; Oliva-Paterna et al., 2003a and 2003b; Verdiell- Cubedo et al., 2006a and 2006b). A poor body condition can negatively affect survival, maturity and reproductive effort in subsequent phases of fish life-history (Hoey and McCormick, 2004; Morgan, 2004). Therefore, fish condition indices are useful to assess population status, the impact of management actions, and anthropogenic influences on fish (Brown and Austin, 1996). The southern Iberian barbel, Luciobarbus sclateri (Günther, 1868), is an endemic fish in the ecosystems of the central-southern Iberian Peninsula (Doadrio, 2001; Kottelat and Freyhof, 2007). L. sclateri is a useful indicator of fish community status because it has a widespread distribution, a long life-span (9-14 years for males and 12-19 years for females) (Lucena et al., 1979; Herrera et al., 1988), it is the most abundant fish in the fluvial section of the Guadiamar River basin (Fernández-Delgado and Drake, 2008), and its reproductive migration usually occurs within the same catchment (Herrera and Fernández-Delgado, 1992; Rodríguez-Ruiz and Granado- Lorencio, 1992; Torralva et al., 1997). Moreover, the relevant effects of habitat quality disturbances on body condition of this target species have previously been reported in studies from other semi-arid regions in the Iberian Peninsula (Oliva-Paterna et al., 2003a; 2003b and 2003c). The objectives of this study were (1) to assess and compare body condition of L. sclateri from fluvial sectors inside and outside the area affected by the toxic spill and (2) to analyze the relationships between population condition at site level and environmental variables related to water quality, the physical state, ecological quality, possible resources exploited by fish and potential intra and inter-specific interactions. We hypothesized that the condition of barbels in the Guadiamar River basin is influenced by whether they are found inside the affected area or not. 37
Las comunidades de peces del río Guadiamar y el accidente minero de Aznalcóllar Figure 1. Sampling at sites at the Guadiamar River basin in the southern Iberian Peninsula. G1-G5: sampling sites located in the non-affected area of the Guadiamar River and G6-G8: sampling sites located in the affected area of the Guadiamar River; A and F: sampling sites located in the non-affected area of the Ardachón and Frailes tributaries, respectively. 38
Page 1 and 2: DEPARTAMENTO DE ZOOLOGÍA UNIVERSID
Page 4 and 5: DEPARTAMENTO DE ZOOLOGÍA UNIVERSID
Page 6 and 7: TITULO DE LA TESIS: LAS COMUNIDADES
Page 8: 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 52 and 53: 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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