During January and February 1997, two separate surveys of the birds
and seals of the South Sandwich Islands archipelago were made, with
further data obtained from the northern islands during February
1998. Together, these surveys provide the most recent and accurate
estimates of breeding populations of most species, their
distributions, and their habitat. Observations were made (1) from a
small vessel operating close inshore, which surveyed approximately
92% of the archipelago's coastline, in addition to making shore
counts at selected locations; (2) during a six-week shorebased field
camp on Candlemas Island; and (3) opportunistically during
helicopter-supported landings and airborne operations over all
islands in the archipelago. The surveys recorded 16 species of
breeding birds, including the first confirmation of breeding by
black-bellied storm petrels (Fregetta tropica) and
Antarctic terns (Sterna vittata), the second record
of incubating king penguins (Aptenodytes
patagonicus), and the location of many previously
unrecorded seabird breeding sites. The population of chinstrap
penguins (Pygoscelis antarctica), at approximately
1.5 x 10 pairs is considerably less than the estimate of 5 x 10
pairs currently in use, and represents about 30% of the world
population. Populations of chinstrap penguins, Antarctic fulmars
(Fulmarus glacialoides), cape petrels
(Daption capense), and snow petrels
(Pagodroma nivea) in the South Sandwich Islands
are of global significance. Five species of seals were recorded. At
the time of the surveys, only Antarctic fur seals
(Arctocephalus gazella) were confirmed to be
breeding, and several new breeding sites were located. Pup numbers
showed a small increase compared with the few earlier records, but
the population has not undergone the large increases seen on South
Georgia and at sites in the maritime Antarctic. The other four
species recorded are considered highly likely to breed either within
the archipelago or amongst pack ice that seasonally surrounds the
islands.