Health evaluation of penguins (Sphenisciformes) following mortality in theFalklands (South Atlantic)

In the Falklands, heavy mortality of rock-hopper penguins Eudyptes chrysoco me occurred during the 1985-86 breeding season. Starvation was diagnosed as the primary cause of death, possibly caused by a shortage of euphausiid cr ustaceans (krill) due to unusual meterological conditions. 'Puffinosis' may possibly have been a contributory factor; otherwise no conclusive evidence of infectious disease or toxicosis was found and also no evidence of radio active contamination. In the 1986-87 breeding season no unusual mortality o ccurred, but 99 apparently healthy penguins were examined, i.e., rockhopper s Eudyptes chrysocome syn E, crestatus, gentoos Pygoscelis papua and Magell anics Spheniscus magellanicus. Full necropsies, were carried out on 54. Tis sue examinations were made for cadmium, copper, iron, manganese, mercury, l ead and zinc. High tissue cadmium concentrations found in healthy birds in 1987 were similar to those in penguins which died in 1986, and therefore no t considered to be of pathological significance, Although there has been no repetition of the unusually hot 1985-86 breeding season in the Falklands, penguins and other seabirds have had fluctuating breeding successes since t hen. The precise cause, including the roles of meteorological conditions an d overexploitation of some forms of prey species, is unclear.