EARTH SCIENCE > Biosphere > Ecological Dynamics > Species Recruitment
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Several populations of Northern (Macronectes halli) and Southern Giant Petrel (Macronectes giganteus) at South Georgia have been monitored since 2014. Three colonies of Northern Giant Petrel are monitored at Greene Peninsula, Discovery Point and Maiviken, and two of Southern Giant Petrel at Greene Peninsula and Harpon Bay. Summary data on breeding numbers and productivity for each season and colony are available, based on data from individual nests.
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The populations of Northern (Macronectes halli) and Southern Giant Petrel (Macronectes giganteus) in defined study areas on Bird Island have been monitored since 2000 and counts of colonies are carried out annually. The total number of breeding pairs of each species, and of mixed pairs (male Northern Giant Petrel x female Southern Giant Petrel), and the number of egg and chick failures are recorded. This allows calculation of hatching, fledging and overall breeding success. The number of chicks which are ringed and their subsequent survival is also recorded.
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Whole island counts of the number of active nests of South Georgia shag Leucocarbo [atriceps] georgianus on Bird Island. Counts were first made in 1989-1990. A repeat count was made in 1994-95 and from 2012-13 onwards active nests have been counted either biennially or annually.
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South Georgia shag Leucocarbo [atriceps] georgianus nest counts from two breeding colonies (North Point and Shagnasty Island) at Signy Island, South Orkney Islands from 1947-2020. Chick counts are also recorded at North Point.
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Brown Skuas (Stercorarius [antarcticus] lonnbergi) on Bird Island have been monitored in a standardised study area since 2011. Data on ringed birds, nest locations, number and size of eggs, number and mass of chicks as well as non-breeders resightings and productivity data are recorded.