fish distribution and abundance in mediterranean streams PDF
Preview fish distribution and abundance in mediterranean streams
UNIVERSIDADE DE LISBOA FACULDADE DE CIÊNCIAS DEPARTAMENTO DE BIOLOGIA ANIMAL FISH DISTRIBUTION AND ABUNDANCE IN MEDITERRANEAN STREAMS: THE ROLE OF HABITAT QUALITY, SPATIAL CONTEXT, AND MOVEMENT PATTERNS Daniel Filipe Carvalho Miranda Pires Doutoramento em Biologia (Especialidade Ecologia) 2012 UNIVERSIDADE DE LISBOA FACULDADE DE CIÊNCIAS DEPARTAMENTO DE BIOLOGIA ANIMAL FISH DISTRIBUTION AND ABUNDANCE IN MEDITERRANEAN STREAMS: THE ROLE OF HABITAT QUALITY, SPATIAL CONTEXT, AND MOVEMENT PATTERNS Daniel Filipe Carvalho Miranda Pires Tese orientada por: Professora Maria Filomena Magalhães Professor Pedro Peres-Neto Doutoramento em Biologia (Especialidade Ecologia) 2012 Preliminary notes According to the Article 41 nr.º 1 of the Post-graduate Studies Regulation (Diário da República N.º 1506 de 2006, II série de 30 de Outubro de 2006), the current thesis includes results that were previously published in collaboration with other co-authors. The candidate states that he was responsible for planning the research activities, data collection and analyses, and writing the manuscripts. This thesis was supported by a grant provided by the Portuguese Science and Technology Foundation (SFRH/BD/21861/2005) . À Raquel Ao Tomé INDEX Agradecimentos/Ackowledgements i Resumo v Abstract xi 1. General Introduction 1 1.1. The riverscape organization 3 1.2. Stream fish ecology 5 1.3. Fish ecology in temporary streams 8 1.4. Fish assemblages in seasonally-drying, mediterranean streams 11 1.5. Study aims and approach 15 1.6. Thesis outline 17 1.7. References 19 2. Study Area 29 2.1. Environmental settings 32 2.2. Fish fauna 36 2.3. References 38 3. Variation in fish assemblages across dry-season pools in a mediterranean stream: effects of pool morphology, physicochemical factors and spatial context 41 3.1. Introduction 43 3.2. Study area 45 3.3. Methods 46 3.4. Results 52 3.5. Discussion 58 3.6. References 66 4. Movements of the endangered chub Squalius torgalensis in a mediterranean stream: dry- and wet-season patterns 71 4.1. Introduction 73 4.2. Study area and focal species 75 4.3. Methods 77 4.4. Results 81 4.5. Discussion 86 4.6. Concluding remarks 89 4.7. References 91 5. Fish assemblage variation across a mediterranean stream: the role of habitat quality, connectivity to refugia, and neighbourhood effects 95 5.1. Introduction 97 5.2. Study Area 99 5.3. Methods 101 5.4. Results 107 5.5. Discussion 113 5.6. Concluding Remarks 121 5.7. References 123 6. General discussion 129 6.1. Main findings 131 6.2. Drivers of fish distribution and abundance 133 6.3. Conservation and management implications 141 6.4. References 145 7. Concluding remarks 153 7.1. Future research directions 156 7.2. References 161 Appendix A1 Appendix 1 A3 Appendix 2 A11
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