Whole island counts of South Georgia Shag nests at Bird Island, South Georgia, from 1989-2020 ...

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. ... : Observational...

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Bibliographic Details
Main Author: Wood, Andrew
Format: Dataset
Language:English
Published: UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation 2020
Subjects:
"EARTH SCIENCE","BIOSPHERE","ECOLOGICAL DYNAMICS","SPECIES/POPULATION INTERACTIONS","SPECIES LIFE HISTORY"
"EARTH SCIENCE","BIOSPHERE", "ECOLOGICAL DYNAMICS", "COMMUNITY DYNAMICS","SPECIES RECRUITMENT"
Bird Island
Blue-eyed Shag
Colony counts
Phalacrocoracidae
Population
South Georgia Shag
Pearson Point
Blue Eyed Shag
Online Access:https://dx.doi.org/10.5285/fc18715a-07d6-4d03-b27c-124637338201
https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01198
Description
Summary: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. ... : Observational data is collected as part of a long term population monitoring initiative carried out over multiple decades. Counts take place over a number of days, at up to 21 colonies across Bird Island. Not all colonies are occupied in all seasons. Annually collected egg-laying data from two colonies on Bird Island (Wanderer Ridge Extension and Pearson Point) are used to determine optimal survey dates for breeding pairs, at which time all other colonies are surveyed and occupied nests recorded. Birds are observed either from within the colony, or from a nearby vantage point using binoculars. Birds are counted if they are sitting tight, or are deemed to have well-built nests. Experienced observers survey each colony area at least twice in the same day. Surveys are repeated until the two counts are within 10%. The mean count value is then calculated and presented. More recently, some counts have been conducted using counts of nests in photographs. The 1989/90 and 1994/95 data were collected by Centre for ...

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