Long-term and seasonal zooplankton dynamics in the northwest Iberian shelf and its relationship with meteo-climatic and hydrographic variability
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AuthorsButtay, L. (Lucie); Miranda, A. (Ana); Casas-Rodríguez, G. (Gerardo); González-Quirós, R. (Rafael); Nogueira, E. (Enrique)
NW Iberian shelf
Long-term and seasonal dynamics of zooplankton abundance and taxonomic composition and its relationship with meteo-climatic and hydrographic factors were investigated on the northwest Iberian shelf. Zooplankton were collected monthly (1995–2011) at two locations within and off the Rı´a of Vigo (Station 1 and Station 3, respectively). Total abundance of zooplankton (NZT) varied annually following on average a unimodal cycle, with peak values between late spring and early autumn. In the long term, the time series of NZT exhibited three contrasting periods: A) 1995–2001, characterized by low abundance and low amplitude seasonality, with a stepped increase towards 2001; B) 2001–2006, of high abundance and marked seasonality enclosing the maximum values of the time series; and C) 2006–2010, of intermediate abundance and amplitude of the seasonal cycle. The most common taxonomic groups showed similar long-term and seasonal patterns. Principal component analysis revealed a shift in ...
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