Importancia de la variabilidad climática en las pesquerías y biología de la merluza europea Merluccius merluccius (Linnaeus, 1758) de la costa noroccidental africana
Tesis doctoral [Summary] Fish population and fisheries fluctuations are closely linked to climate dynamics through environmental variability that determines the distribution, migration and abundance of fish. Fishery science were largely focused on the great northern hemisphere fisheries, which some...
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| Format: | Doctoral or Postdoctoral Thesis |
| Language: | Spanish |
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2010
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| Online Access: | http://hdl.handle.net/10508/220 http://hdl.handle.net/10261/325885 |
| Summary: | Tesis doctoral [Summary] Fish population and fisheries fluctuations are closely linked to climate dynamics through environmental variability that determines the distribution, migration and abundance of fish. Fishery science were largely focused on the great northern hemisphere fisheries, which some of them fluctuate at decadal time scales and show patterns of synchrony with low frequency signals, as reflected by climatic indices such as the North Atlantic Oscillation (NAO). However, there is scarce information about these patterns at lower latitudes like NW African coast, in spite of this area supports large international fisheries. The aim of this work was to analyze how climate variability described by NAO and the physical environment influences the productivity of European hake abundance, growth and recruitment variability. The European hake is widely distributed in the North Atlantic and their southern distribution limit is located in NW Africa. Historically it has been carried out an important multinational fishery in this area. In order to understand why it is important to test the climatic hypothesis over European hake stock, I presented the background elements in three main discussion lines. In Chapter 1, I compared the biology and population dynamics between European hake of NW Africa and populations from North Atlantic and Mediterranean Sea. In Chapter 2, it is described and analyzed the structure and evolution of European hake fisheries in NW Africa, focused on unexplained variability of stock assessment procedures carried out until now. In Chapter 3, the main climatic and environmental features of NW African coast are described, emphasizing the potential deterministic influence that variability of these features might exert on the biology, population dynamics and fisheries of European hake in this area. In Chapter 4, catch-based abundance indices of Moroccan and Spanish fisheries were used as the dependent variables in correlation analysis with NAO index. Time series analysis techniques were ... |
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