The main objective of the research was to gather information on the effects of climate changes and their consequent influence on the hydrological and dynamic characteristics of plankton in the estuaries.
The author of the thesis was Guillermo Aravena Cuevas and his work entitled Impact of climate variability on the pelagic ecosystem of two contrasting estuaries of the Basque coast (Bay of Biscay): a time series analysis. He has studied the estuaries from Bilbao and Urdaibai.
The data was obtained from the environmental monitoring programme that has been undertaken in these two estuaries since 1997. Over the last decade (1997-2006) an environmental monitoring plan of the pelagic ecosystem of the estuaries has been implemented at these estuaries. By using hydrological data (flow, temperature of water and dissolved oxygen) and biological ones (chlorophyll and mesozooplankton), together with meteorological variables (temperature of air and precipitations) and climatic data (Oscillation of the North Atlantic, ONA), the effects of climate changes on the hydrological conditions and the planktonic communities of these estuaries were evaluated.
Time series analysis
Mr Aravena applied a number of the most recent and specific time series analysis methodologies. Time series analysis involves methods that help to interpret a sequence of data measured over determined moments of time, ordered chronologically and, normally, spaced out between each other in a uniform manner. Representative information is extracted from these data, referring both to origins as to the possibility of extrapolating and predicting future behaviour.
In the words of the author of the thesis, the time series analysis methodologies used were suitable for evaluating the changes in the pelagic ecosystems of the Bilbao and Urdaibai estuaries and for determining their relationships with climate factors.
In general, the tendencies of these environm
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