Following the fish: penguins and productivity in the South Atlantic

By P. Boersma, Ginger A. Rebstock, E. Frere, S. Moore. 2009

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Collapse of South Africa's penguins in the early 21st century (2011, unknown): “A penguin will expend more energy the further it travels to forage, which will reduce the effective resources delivered to chicks and increase adult maintenance costs (Boersma et al. 2009).”
Biophysical interactions in the plankton: A cross‐scale review (2012, background): “Plankton aggregations at fronts play an important role in determining the distributions of larger predators, by providing important foraging grounds for penguins (Boersma et al. 2009), seabirds (Schneider 1990; Russell et al.”
Central-Place Foraging in an Arctic Seabird Provides Evidence for Storer-Ashmole's Halo (2009, background): “For example, foraging patches (fish spawning grounds) may be distant from the only location suitable for breeding (Davoren et al. 2003a, Hedd et al. 2009; see also Boersma et al. 2009).”
Pyrosequencing faecal DNA to determine diet of little penguins: is what goes in what comes out? (2010, unknown): “Seabirds are major consumers in many marine ecosystems (Brooke 2004) and long-term diet data of these toplevel predators provide a powerful means of monitoring changes in the availability of marine resources at lower trophic levels (Boyd and Murray 2001; Hedd et al. 2006; Boersma et al. 2009 ).”