Diet of sardine (Sardinops sagax) in the northern Humboldt Current system and comparison with the diets of clupeoids in this and other eastern boundary upwelling systems

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Changes in diet and trophic position of a top predator 10 years after a mass mortality of a key prey (2010, background): “(Espinoza et al., 2009), and exploit a slightly higher trophic level than pilchard (van der Lingen, 1994; van der Lingen et al.”
Is there enough zooplankton to feed forage fish populations off Peru? An acoustic (positive) answer (2011, methodology): “This new independent high biomass estimation of macrozooplankton is in agreement with the new finding in trophic ecology indicating that forage fish consume mainly macrozooplankton (Espinoza and Bertrand, 2008; Espinoza et al., 2009).”
The trophodynamics of marine top predators: Current knowledge, recent advances and challenges (2015, background): “They are the major predators of copepods, euphausiids, ostracods and amphipods (Espinoza et al., 2009; Young and Blaber, 1986) and are therefore an essential step in the conversion of primary productivity to top-predator biomass (Table 2).”