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

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Relaciones peces/hábitat en el Guadiamar Figure 1. Location of the Guadiamar River Basin and the 22 sampling sites. 57
Las comunidades de peces del río Guadiamar y el accidente minero de Aznalcóllar Sampling protocol The sampling period was divided into three campaigns: winter (2006) for the low flow streams and spring and summer (2007) for the high flow courses that were not wadeable during the rainy period (winter). In order to cover the whole perennial stream network (except the marshland), 22 sampling sites were selected. Using a geographic information system and high-resolution maps provided by the Andalusian Government, the perennial stream network (291.94 km) was split into hydrological fragments (part of a stream with similar hydrological features, located between two tributaries or large disruptions). These hydrological fragments were divided into approximately 10 km segments, and finally, every segment was divided into high, mid-slope or lowland areas, and one sampling site was allocated to each of these areas. The exact sampling site location was finally chosen in the field, whenever a wadeable reach was found within the selected area. Fish abundance at each sampling site was estimated by electrofishing (220 V, 2-5 A, C.C.). Backpacking (1300 W) was the selected procedure for 1 m depth and 5 m width reaches. A more powerful engine fixed to the riverbank (2400 W) was needed in order to maintain the same sampling effort on larger reaches (Lobón-Cerviá, 1991). Caught fish were identified to species and released into the stream again. Sampling effort was constant, collecting the maximum number of individuals in one sweep. Habitat data were collected at two different scales: catchment (considered as the land surface covered by all permanent streams that drain onto a sampling site) and site (the stream section where fishing takes place and field data are recorded). Throughout the paper, both catchment and site will refer to scale, whereas basin, watershed, reach and stretch are used to indicate specific areas. A total of 71 environmental variables thought to be relevant for fish species richness and diversity were recorded at each sampling site, by means of different methods (see Fernández-Delgado et al., 2010 for further details) and at different sampling scales (Appendix 1). In several cases, variables were summarized by means of PCAs (see Statistical analyses section and Appendix 1). All catchment scale data and several site scale data were extracted from digital maps provided by the Andalusian Government, using ArcGis ® software (see Fernández- Delgado et al., 2010). 58
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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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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
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Appendix 1. Environmental variables
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