Sardine regime shifts off Portugal: a time series analysis of catches and wind conditions

By M. F. Borges, Amp Santos, N. Crato, H. Mendes, B. Mota. 2003

181 citations recorded by the source corpus.

Decadal changes have been observed in the annual catch of sardine (Sardina pilchardus W). Long-term changes have also been observed in alongshore winds off Portugal in the last decades in winter months. During sardine spawning season (winter), northerly winds that favour upwelling led to unfavourable conditions for egg and larval survival. By using time series analysis, we investigated the effect of wind conditions and North Atlantic Oscillation (NAO) on the sardine catches, in the period from 1946-1991. We also investigated the time lag between recruitment strength and its turnout in catches. We concluded that recruitment is forced to a lower level when the frequency and intensity of northerly wind exceeds a certain limit in winter. Our time series retrospective analyses led to evidence of climatic driven regime-shifts in West Portugal sardine productivity in late 1960s-early 1970s. These results are discussed in terms of their implications in fisheries management plans.

Subfields: Accounting, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/c73416f11f7944bfa33261629e01c93302f609e8

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Citations in the corpus

• Temporal and geographic variability of sardine maturity at length in the northeastern Atlantic and the western Mediterranean (2006, background): “There is evidence of environmental change off western Iberia during the last two decades (Santos et al., 2001, 2005; Borges et al., 2003; Guisande et al., 2004), and these seem to be part of wider temporal and spatial variations in the hydroclimatic conditions of the whole North Atlantic (Ottersen e”
• Tide and wind control of megalopal supply to estuarine crab populations on the Portuguese west coast (2006, background): “The upwelling season typically lasts from April to September and has intensity maxima in July and August, although intense episodes can also happen during winter (Borges et al. 2003, Huthnance et al. 2002).”
• The use of Hepatic and Somatic Indices and Histological Information to Characterize the Reproductive Dynamics of Atlantic Sardine Sardina pilchardus from the Portuguese Coast (2011, unknown): “These characteristics, in addition to important interannual fluctuations in population biomass and recruitment, make Atlantic sardine stocks especially difficult to manage (Cole and McGlade 1998; Schwartzlose et al. 1999; Borges et al. 2003; Carrera and Porteiro 2003; Silva et al. 2009).”
• Common dolphin (Delphinus delphis) habitat preferences using data from two platforms of opportunity (2012, background): “, 2003), both have shown a decreasing trend in the last 20 years (Borges et al., 2003; Marques et al., 2003), and signs of sardine overfishing in the Portuguese mainland coast are documented (Baeta et al.”
• Small pelagic fish in the new millennium: A bottom-up view of global research effort (2020, background): “Examples include how prevailing wind conditions affect sardine recruitment (Borges et al., 2003; Guisande et al., 2004), how winter Fig.”
• Recent changes in the distribution of a marine gastropod, Patella rustica Linnaeus, 1758, and their relationship to unusual climatic events (2006, background): “Consistent responses to climate change have been described at different trophic levels for both sessile and pelagic assemblages (Southward et al., 1995; Holbrook et al., 1997; Sagarin et al., 1999; Wethey, 2002; Beaugrand & Reid, 2003; Borges et al., 2003; Hawkins et al., 2003; Zacherl et al., 2003;”
• Laboratory investigations on the effect of prey size and concentration on the feeding behaviour of Sardina pilchardus (2007, unknown): “High fluctuations in both population size and catches off the Iberian coast have stimulated several studies of this commercially important resource (e.g. Borges et al. 2003, Stratoudakis et al. 2003, Guisande et al. 2004).”
• Distribution of cephalopod paralarvae in relation to the regional oceanography of the western Iberia (2008, background): “, 2004) in association with positive values of the North Atlantic Oscillation (NAO) index (Borges et al., 2003).”
• Diet and feeding intensity of sardine Sardina pilchardus: correlation with satellite-derived chlorophyll data (2008, background): “…and recruitment of the Atlanto-Iberian sardine stock observed over the last decades were found to be related to changes in environmental conditions (Borges et al. 2003, Guisande et al. 2004, Silva et al. 2006), and, within the area of distribution of this stock, there are distinct oceanographic…”
• Physical-biological interactions in the life history of small pelagic fish in the Western Iberia Upwelling Ecosystem (2007, background): “A more consistent change in the patterns and intensity of coastal upwelling off W Iberia was the increase in the frequency and intensity of northerly winds (upwelling-favourable) in winter (Dias, 1994; Dias et al., 1996; Borges et al., 2003; Santos et al., 2005) during the period of 1947– 2001.”
• Upwelling index: a powerful tool for marine research in the NW Iberian upwelling system (2014, methodology): “UI has also been used extensively in biological oceanographic studies in the Galician region; in phytoplankton species distribution,(23) mussel growth,(24) micro plankton variability,(25) on the study of the benthic regime(26) and phytoplankton assemblages(27) In fisheries research, the UI has been ”