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

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La composición de especies de peces del Guadiamar Material and Methods Study area The Guadiamar River basin drains an area of 1.880 Km 2 in the South-western Iberian Peninsula near the Guadalquivir River mouth (Fig. 1). Climate is sub-humid Mediterranean with oceanic influences and average temperatures range from 9ºC in winter to 29ºC in summer. The river network flow in this climate is subject to an irregular hydrological regime on both intra- and inter-annual scale, with natural disturbances such as major droughts and floods. The severe droughts cause the drying of most small streams and the creation of isolated pools during summer (Gasith and Resh 1999). The catchment shows an environmental transition linked to river section type. Pine forests (Pinus spp.) and dehesas (Quercus spp., xeric Mediterranean forest) are the predominant vegetation in the upper section; olive groves, cereal fields and vineyards form a mosaic in the middle section; and close to the Doñana Natural Park, in the lower section, the marsh starts, dominated by Salicornia spp. shrubs, and pastures with Sylibus marianum, Hordeum murinum and Plantago coronopus. The hydrological network is interrupted by three dams (Fig. 1). Two of them collect less than 4 hm 3 in the source area, and there is one large reservoir (20 hm 3 ) in the Agrio River, slightly upstream from the spill point (Borja et al. 2001). Data sources and sampling protocols Guadiamar River basin fish composition was obtained from a wider study that assessed the long-term effects caused by the spill on fish communities. This monitoring focused on the affected area, which occupied both the fluvial sector and marshland. Fish were caught between 1999 and 2011 (intensive campaigns in 2002-2004; 2006-2007 and 2011). The inclusion of species in the list drawn for this work (Table 1) derived from different information sources obtained in several projects. Data about Guadiamar River basin fishes available in the literature was also included, however, pre-spill cites have not been included in the up-dated list. 25
Las comunidades de peces del río Guadiamar y el accidente minero de Aznalcóllar Figure 1. Location of the Guadiamar River basin where different sections, river network and the area affected by the spill are shown. 26
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 37: 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
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Las comunidades de peces del río G
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Table 1. List of the fish species c
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Appendix 1. Environmental variables
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