Skip to main content Accessibility help
×
Home

Revised population estimate and trends for the Endangered Northern Rockhopper Penguin Eudyptes moseleyi at Tristan da Cunha

  • BRAD ROBSON (a1), TREVOR GLASS (a2), NORMAN GLASS (a2), JAMES GLASS (a3), JERRY GREEN (a2), CLIFTON REPETTO (a2), GRAHAM RODGERS (a2), ROBERT A. RONCONI (a4), PETER G. RYAN (a5), GEORGE SWAIN (a2) and RICHARD J. CUTHBERT (a6)...

Abstract

Around 80% of the world population of Northern Rockhopper Penguin Eudyptes moseleyi is found at Tristan da Cunha and Gough Island in the South Atlantic Ocean, where populations appear to be declining. However, numbers of birds at Middle Island, a small satellite island of Nightingale Island at Tristan Cunha, have not been counted since 1973 when an estimated 100,000 pairs were recorded. Updated population counts were obtained for all four islands at Tristan da Cunha (Tristan, Inaccessible, Nightingale and Middle islands) in 2009 providing a census of the whole island group and the first repeat count of Middle Island. Estimated breeding numbers at these four islands were Tristan 6,700 pairs, Inaccessible 54,000 pairs, Nightingale 25,000 pairs and 83,000 pairs at Middle Island. These counts confirm that Tristan da Cunha is a vitally important site for this ?Endangered? species holding over 65% of the global population and that breeding number have been relatively stable over the last 30 years.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Revised population estimate and trends for the Endangered Northern Rockhopper Penguin Eudyptes moseleyi at Tristan da Cunha
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Revised population estimate and trends for the Endangered Northern Rockhopper Penguin Eudyptes moseleyi at Tristan da Cunha
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Revised population estimate and trends for the Endangered Northern Rockhopper Penguin Eudyptes moseleyi at Tristan da Cunha
      Available formats
      ×

Copyright

Corresponding author

*Author for correspondence, email: richard.cuthbert@rspb.org.uk

References

Hide All
Birdlife International (2010a) Rockhopper Penguins: A plan for research and conservation action to investigate and address population changes. Proceedings of an international workshop Edinburgh, 3-5 June 2008. Cambridge, UK: Birdlife International.
Birdlife International (2010b) IUCN Red List Criteria. Accessed online on 16 July 2010 at http://www.birdlife.org/datazone/species/terms/criteria.html
Cunningham, D. M. and Moors, P. J. (1994) The decline of Rockhopper Penguins Eudyptes chrysocome at Campbell Island, Southern Ocean and the influence of rising sea temperatures. Emu 94: 2736.
Cuthbert, R. and Sommer, E. (2004) Population size and trends of four globally threatened seabirds at Gough Island, South Atlantic Ocean. Mar. Ornith. 32: 97103.
Cuthbert, R., Cooper, J., Burle, H-J., Glass, C. J., Glass, J. P., Glass, S., Glass, T., Hilton, G. M., Sommer, E. S., Wanless, R. M. and Ryan, P. G. (2009) Population trends and conservation status of the Northern Rockhopper Penguin Eudyptes moseleyi at Tristan da Cunha and Gough Island. Bird Conserv. Int. 19: 112.
Cunningham, D. M. and Moors, P. J. (1994) The decline of Rockhopper Penguins Eudyptes chrysocome at Campbell Island, Southern Ocean and the influence of rising sea temperatures. Emu 94: 2736.
Guinard, E., Weimerskirch, H. and Jouventin, P. (1998) Population changes and demography of the Northern Rockhopper Penguin on Amsterdam and Saint Paul Islands. Colonial Waterbirds 21: 222228.
Hilton, G. M., Thompson, D. R., Sagar, P. M., Cuthbert, R. J., Cherel, Y. and Bury, S. J. (2006) A stable isotopic investigation into the causes of decline in a sub-Antarctic predator, the rockhopper penguin Eudyptes chrysocome. Global Change Biol. 12: 115.
Ryan, P. G. (2005) Inaccessible Island bird monitoring manual. Sandy, UK: Royal Society for the Protection of Birds. (RSPB Research Report 16).
Ryan, P. G., Dean, W. R. J., Moloney, C. L., Watkins, B. P. and Milton, S. J. (1990) New information on seabirds at Inaccessible Island and other islands in the Tristan da Cunha group. Mar. Ornith. 18: 4354.
Richardson, M. E. (1984) Aspects of the ornithology of the Tristan da Cunha Group and Gough Island, 1972–1974. Cormorant 12: 122201.
Swales, M. K. (1965) The seabirds of Gough Island. Ibis 107: 1742, 215–229.

Revised population estimate and trends for the Endangered Northern Rockhopper Penguin Eudyptes moseleyi at Tristan da Cunha

  • BRAD ROBSON (a1), TREVOR GLASS (a2), NORMAN GLASS (a2), JAMES GLASS (a3), JERRY GREEN (a2), CLIFTON REPETTO (a2), GRAHAM RODGERS (a2), ROBERT A. RONCONI (a4), PETER G. RYAN (a5), GEORGE SWAIN (a2) and RICHARD J. CUTHBERT (a6)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed