Variability in krill biomass links harvesting and climate warming to penguin population changes in Antarctica
The West Antarctic Peninsula (WAP) and adjacent Scotia Sea support abundant wildlife populations, many of which were nearly extirpated by humans. This region is also among the fastest-warming areas on the planet, with 5–6 °C increases in mean winter air temperatures and associated decreases in winter sea-ice cover. These biological and physical perturbations have affected the ecosystem profoundly.
http://www.pnas.org/content/early/2011/04/06/1016560108.abstract