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30 Apr 2012
A new study of the wandering albatross – one of the largest birds on
Earth – has shown that some of the birds are breeding earlier in the
season compared with 30 years ago.
Reporting online this month (April) in the journal
British team of scientists describe how they studied the breeding habits
of the wandering albatross on the sub-Antarctic island of South
Georgia. They have discovered that because some birds are now laying
their eggs earlier, the laying date for the population is an average of
2.2 days earlier than before.
Wandering albatross pair, nesting on Bird Island, South Georgia
Wandering albatross pair, nesting on Bird Island, South GeorgiaWandering albatross pair, nesting on Bird Island, South Georgia
The researchers say the reasons for this change are unclear. Lead
author Dr Sue Lewis at the University of Edinburgh’s School of
Biological Sciences said, “Our results are surprising. Every year we can
determine when the birds return to the island after migration, and the
exact day they lay their egg. We knew that some birds were laying
earlier – those who were older or had recently changed partner - but now
we see that those which haven’t bred successfully in the past are also
laying earlier, and these birds are effectively driving this trend in
The researchers studied over 30 years of data from birds located near
the British Antarctic Survey’s research station on Bird Island (part of
South Georgia). Nest sites were monitored daily during the pre-laying,
laying, hatching and fledging periods to document breeding patterns.
Numbers of wandering albatrosses on South Georgia have been steadily
declining largely because the birds swallow baited hooks on longlines
set by fishing vessels, and are dragged under and drown. Despite a
recent increase in breeding success over the last 20 years, the number
of birds at Bird Island has fallen by over 50% since the 1960s, from
1700 to only 800 breeding pairs.
British Antarctic Survey bird ecologist Dr Richard Phillips, also an
author on the paper said, “This work is important for understanding more
about the behaviour of these charismatic and threatened birds. In the
Indian Ocean, an increase in the intensity of westerly winds has
resulted in a shift in feeding distribution of wandering albatrosses. It
is possible that earlier breeding in some females at South Georgia is a
consequence of environmental change, but at the moment we are not sure
if this is related to weather, a change in oceanographic conditions or
food availability to which only some birds are responding.”
This research is a collaboration between the University of Edinburgh
and British Antarctic Survey and was funded by the Natural Environment
Research Council (NERC).
Issued by the British Antarctic Survey Press Office:
Athena Dinar, BAS, Tel: +44 (0)1223 221414; mobile: +44 (0)7736 921693, email: firstname.lastname@example.org
Audrey Stevens, BAS, Tel: +44 (0) 1223 221230, email: email@example.com
Sue Lewis, University of Edinburgh – Tel. ++44 7766023703 (9am-12.30pm); email: firstname.lastname@example.org
Richard Phillips, British Antarctic Survey – Tel. ++44 1223 221610; email: email@example.com
Notes for Editors:
Intrinsic determinants of a population trend in timing of breeding in the wandering albatross by Sue Lewis, Daniel H. Nussey, Andrew G. Wood, John P. Croxall and Richard Phillips is published online this month (April) in the journal Oikos .
Stunning broadcast-quality footage and stills of South Georgia, Antarctica and wandering albatross colonies are available from the BAS Press Office as above.
The wandering albatross is the largest of seabirds, with a wing span reaching 3m and a body mass of 8–12 kg. It lays a single egg, and breeds only every second year. The birds take ten years to reach sexual maturity. They have very long life spans, with some individuals living to over 60 years of age. But many are now being killed off before they can reach half that age, as a result populations are in rapid decline. Albatrosses have one of the lowest reproductive rates of any bird.
Albatrosses cover huge distances when foraging for food, even during breeding, with the foraging ranges of most species covering thousands of square kilometres of ocean. Wandering albatrosses ( Diomedea exulans ) range from sub-tropical to Antarctic waters on trips covering up to 10,000 km in 10–20 days.
The wandering albatross arrives in November to breed in loose colonies on flat grasslands, giving plenty of room for its spectacular displays. It lays eggs in December, chicks hatch in April and are reared throughout the winter (on a diet mainly of squid and fish) fledging after more than a year, in November and December. Successful parents then take a year off, migrating to feeding areas all around the Southern Ocean.
The wandering albatross is site faithful and breeds every two years. Without BAS’s individual based study on Bird Island, the differences between good and poor breeders would be lost. Knowing that such individual variation exists is crucially important if scientists want to understand population processes correctly, highlighting the incredible value of long term individual based studies such as this one.
Estimates suggest that 300,000 seabirds are killed annually in the world’s longline fisheries. Since 2001, by-catch rates in well-regulated fisheries have decreased substantially, remained stable in less well-regulated ones and probably increased in pirate fisheries.
Several albatross species — legendary protectors of seafarers — are heading for extinction. Biologists have discovered that swordfish, tuna and other fishing fleets are killing more than 100,000 of these birds every year. In a couple of decades some may be wiped out unless urgent action is taken. This is despite the availability of a range of measures that can massively reduce the number of albatrosses being killed. These include weighting of lines so they sink quickly, retention of offal on board so that birds are not attracted to the vessel in the first place, setting lines at night, and setting up bird-scaring or ‘tori’ lines — made up of brightly-coloured streamers to startle seabirds.
British Antarctic Survey (BAS) , a component of the Natural Environment Research Council (NERC), delivers and enables world-leading interdisciplinary research in the Polar Regions. Its skilled science and support staff based in Cambridge, Antarctica and the Arctic, work together to deliver research that uses the Polar Regions to advance our understanding of Earth as a sustainable planet. Through its extensive logistic capability and know-how BAS facilitates access for the British and international science community to the UK polar research operation. Numerous national and international collaborations, combined with an excellent infrastructure help sustain a world leading position for the UK in Antarctic affairs. For more information visit www.antarctica.ac.uk
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the UK's main agency for funding and managing world-class research,
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