WG-EMM-PSW-08

This paper describes methods and results from a recent aerial survey of the macaroni penguin population at South Georgia.

More white-chinned petrels (Procellaria aequinoctialis) are accidentally killed in fisheries than probably any other seabird in the world, but the population impact of this mortality is poorly understood, partly because there have been no estimates of the species’ abundance in recent decades. The largest breeding aggregation, comprising the majority of the worldwide total, is believed to be on Read More
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This paper presents spatial modelling based abundance and density estimates of pack-ice seals, crabeater, Weddell and leopard seals, based on aerial survey line transect data collected in January 1999 under the Antarctic Pack-Ice Seal (APIS) programme. Estimates are reported for the Antarctic Peninsula and the western Weddell Sea region (90º to 30º W and 60º to 80º S).

Broad-scale surveys of penguin breeding abundance generally rely on on-off counts of adults, nests or chicks across several or many breeding sites, and the timing of these counts is often outside the control of researchers. Time series counts of Adelie penguin breeding population attributes (adults, nest and chicks) within the breeding period show considerable variability across space and time Read More
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The size of two of the inaccessible (non-breeding) components of the Adélie penguin population associated with the Béchervaise Island breeding population is estimated over the past decade using a series of mark-recapture analyses and some simple population modelling techniques.

Counts of Adélie penguin populations are most conveniently and most often undertaken at breeding sites during the breeding season. The objective of this paper is to identify and describe the aspects of Adélie penguin population structure, dynamics and demography that are relevant to the interpretation of counts made at breeding sites and the estimation of overall population abundance derived Read More
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Published accounts of population surveys and population estimates for flying seabirds across Area 48 are reviewed. Spatial coverage of count data and population estimates varies greatly between species across their breeding ranges in Area 48. Most population estimates reviewed date from the 1970s and 1980s. Survey methodologies are often poorly described. Potential biases and uncertainties Read More
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In addition to a review of published studies on Adelie penguin abundance at breeding sites in Antarctica, Southwell (2004) proposed a general abundance estimator appropriate for a species of that kind. The present study attempts to implement this estimator in the form of a parametric bootstrap model, utilising as input data published counts of Adelie penguins and estimates of their uncertainty Read More
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This paper very briefly summarises some aspects Adelie penguin count data from east Antarctica to demonstrate the extent and nature of variability in data from this large region, and to provide some background to some aspects of the R program SEABIRD outlined in McKinlay and Southwell (submitted working paper).

Potential Adélie penguin breeding habitat (defined as ice-free land with area >4000 m2 and within 500 m of the ocean) in the Australian Antarctic Territory (AAT) was mapped using a GIS, and the literature reviewed for evidence of the mapped habitat being searched for occupation by breeding Adélie penguins. The total area of potential breeding habitat was estimated to be close to 700 km2. Read More
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This paper reports the results of a ground survey of fur seal colonies from in the South Shetland Islands in 2007/08. Multiple counts of pups at each colony were conducted to establish confidence limits on pup production. Total pup production was 7,602 (±103) pups down 24.4% from the last census in 2001/02 (10,057 ±142 pups born). Dead pups accounted for 1.64% of the total. A comparison with Read More
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Penguin censuses on the Antarctic Peninsula are often subject to logistical challenges that preclude nest censuses being conducted at the peak of egg laying as established by the CCAMLR Ecosystem Monitoring Program (CEMP) (Scientific Committee for the Conservation of Antarctic Marine Living Resources 2004). Additionally, the historical literature, necessary for establishing baseline conditions Read More
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