Fish prey of the Wandering Albatross Diomedea exulans at South Georgia

Polar Biology ◽  
1988 ◽  
Vol 9 (1) ◽  
pp. 9-16 ◽  
Author(s):  
J. P. Croxall ◽  
A. W. North ◽  
P. A. Prince





Ibis ◽  
2008 ◽  
Vol 142 (2) ◽  
pp. 199-207 ◽  
Author(s):  
SIMON D. BERROW ◽  
RICHARD HUMPIDGE ◽  
JOHN P. CROXALL


Polar Biology ◽  
2021 ◽  
Author(s):  
Carola Rackete ◽  
Sally Poncet ◽  
Stephanie D. Good ◽  
Richard A. Phillips ◽  
Ken Passfield ◽  
...  

AbstractThe wandering albatross, Diomedea exulans, is a globally threatened species breeding at a number of sites within the Southern Ocean. Across the South Georgia archipelago, there are differences in population trends even at closely located colonies. Between 1999 and 2018 the largest colony, at Bird Island, declined at 3.01% per annum, while in the Bay of Isles, the decline was 1.44% per annum. Using mean demographic rates from a 31-year study at Bird Island and an 11-year study of breeding success at Prion Island in the Bay of Isles in a VORTEX model, we show that differences in breeding success do not fully explain observed differences in population trends. Other potential contributing factors are differential use of foraging areas, with possible knock-on effects on adult body condition, provisioning rate and breeding success, or on bycatch rates of adults or immatures.



1987 ◽  
Vol 96 (1) ◽  
pp. 1-10 ◽  
Author(s):  
P. G. Rodhouse ◽  
M. R. Clarke ◽  
A. W. A. Murray


1995 ◽  
Vol 95 (3) ◽  
pp. 223-230 ◽  
Author(s):  
David Nicholls ◽  
Durno Murray ◽  
Harry Battam ◽  
Graham Robertson ◽  
Philip Moors ◽  
...  


2011 ◽  
Vol 68 (9) ◽  
pp. 1857-1864 ◽  
Author(s):  
José C. Xavier ◽  
Richard A. Phillips ◽  
Yves Cherel

AbstractXavier, J. C., Phillips, R. A., and Cherel, Y. 2011. Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important. – ICES Journal of Marine Science, 68: 1857–1864. Cephalopods are components of the diet of many predators worldwide. They are identified mainly using their chitinized upper and lower beaks, but because it has been assumed that the number of upper and lower beaks would be the same in predator diet samples, more effort has been put into creating keys for the lower beaks, which are more easily identifiable from morphology. A test is made of whether the number of upper and lower beaks differs in diet samples collected from a major cephalopod predator, the wandering albatross (Diomedea exulans), potential biases in the estimation of predator diets are assessed, and upper:lower beak ratios in published studies of other seabirds, seals, whales, and fish from different parts of the world reviewed. The ratio of upper to lower beaks in diet samples from wandering albatrosses varied greatly in a single year (from 69.6% more lower beaks to 59% more upper beaks), and between years (from 0.5 to 32.1% more upper beaks), and biases were greater for certain cephalopod species, resulting in underestimation of their relative importance. Future studies need to consider using both upper and lower beaks to improve the assessment of the contribution of different cephalopods to predator diets.



Ibis ◽  
2006 ◽  
Vol 149 (1) ◽  
pp. 67-78 ◽  
Author(s):  
PIERRE JOUVENTIN ◽  
ANNE CHARMANTIER ◽  
MARIE-PIERRE DUBOIS ◽  
PHILIPPE JARNE ◽  
JOËL BRIED


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