scholarly journals Variation among colonies in breeding success and population trajectories of wandering albatrosses Diomedea exulans at South Georgia

Polar Biology ◽  
2021 ◽  
Author(s):  
Carola Rackete ◽  
Sally Poncet ◽  
Stephanie D. Good ◽  
Richard A. Phillips ◽  
Ken Passfield ◽  
...  
Keyword(s):  
Body Condition ◽  
Breeding Success ◽  
Population Trends ◽  
Contributing Factors ◽  
South Georgia ◽  
Vortex Model ◽  
Demographic Rates ◽  
Diomedea Exulans ◽  
Adult Body ◽  
Provisioning Rate

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.

scholarly journals Provisioning Rate and Attendance Patterns of Wandering Albatrosses at Bird Island, South Georgia

The Condor ◽  
2001 ◽  
Vol 103 (2) ◽  
pp. 230-239 ◽  
Author(s):  
Simon D. Berrow ◽  
John P. Croxall
Keyword(s):  
Foraging Behavior ◽  
Body Mass ◽  
Work Rate ◽  
Meal Size ◽  
Trip Duration ◽  
Foraging Patterns ◽  
South Georgia ◽  
Diomedea Exulans ◽  
Attendance Patterns ◽  
Provisioning Rate

Abstract We investigated foraging behavior of Wandering Albatrosses (Diomedea exulans) breeding at South Georgia to assess how sex and season-specific foraging patterns relate to provisioning performance. We estimated Wandering Albatross chicks require 60–65 kg of food over the chick-rearing period; males deliver 54% of this total. Meal size delivered by both sexes remained essentially constant throughout the post-brooding chick-rearing period, but foraging trip duration varied considerably. Females made consistently longer foraging trips and delivered smaller meals but transported an average load that was 20% heavier in proportion to their body mass than males. We suggest that chick-rearing places greater demands on females compared with males and Wandering Albatrosses work hard to deliver food during the first half of chick rearing (at the expense of their own condition), thereafter reduce their work rate, presumably so as not to compromise their survival.

Black-Faced Spoonbill Platalea minor Population Trends, Breeding Success, and Nest Characteristics in the Chilsan Archipelago, South Korea

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Seok-Jun Son ◽  
Ki-Sup Lee ◽  
In-Ki Kwon ◽  
Jung-Hoon Kang ◽  
Sung-Kyung Lee ◽  
...  
Keyword(s):  
South Korea ◽  
Breeding Success ◽  
Population Trends ◽  
Minor Population

scholarly journals The diet of white-chinned petrels Procellaria aequinoctialis, Linnaeus 1758, in years of contrasting prey availability at South Georgia

1999 ◽  
Vol 11 (3) ◽  
pp. 283-292 ◽  
Author(s):  
Simon D. Berrow ◽  
John P. Croxall
Keyword(s):  
Breeding Success ◽  
Prey Item ◽  
Prey Availability ◽  
Euphausia Superba ◽  
Feeding Frequency ◽  
South Georgia ◽  
Important Prey ◽  
Breeding Failure ◽  
Feeding Methods ◽  
Procellaria Aequinoctialis

The diet of breeding white-chinned petrels was studied during the summers of 1996 and 1998 at South Georgia. Krill abundance/availability was high throughout 1996 but apparently low at the beginning of the 1998 breeding season. The diet of white-chinned petrels was similar between years and consistent with previous studies. Krill Euphausia superba (41–42% by weight) was the single most important prey item followed by fish (39–29%) and squid (19–25%). Meal mass was consistent (110 g in 1996, 119 g in 1998) between years but a significant decrease (46%) in feeding frequency in 1998 (0.54 meals day−1 compared to 0.75 meals day−1 in 1996) resulted in 19% less food delivered to chicks in 1998 than in 1996. Breeding success, however, was consistent between years at 44% and similar to that recorded previously at Bird Island. This is in contrast to black-browed and grey-headed albatrosses, both of which experienced almost total breeding failure in 1998. It is suggested that their varied and versatile feeding methods, together with their greater diving ability, capacity to feed at night and extensive foraging range, help white-chinned petrels minimise the effects of krill shortage.

Foraging ecology and interactions with fisheries of wandering albatrosses (Diomedea exulans) breeding at South Georgia

2004 ◽  
Vol 13 (5) ◽  
pp. 324-344 ◽  
Author(s):  
J. C. Xavier ◽  
P. N. Trathan ◽  
J. P. Croxall ◽  
A. G. Wood ◽  
G. Podesta ◽  
...  
Keyword(s):  
Foraging Ecology ◽  
South Georgia ◽  
Diomedea Exulans

scholarly journals Breeding site attendance and breeding success in Phyllomedusa trinitatis (Anura: Phyllomedusidae)

2021 ◽  
Vol 20 (1) ◽  
pp. 53-66
Author(s):  
Cameron M. Boyle ◽  
Eleanor H. Z. Gourevitch ◽  
J. Roger Downie
Keyword(s):  
Body Condition ◽  
Breeding Success ◽  
Breeding Site ◽  
Strong Preference ◽  
Male Body ◽  
Attendance Patterns ◽  
Attendance Pattern ◽  
Males And Females

Using a natural marker, we documented breeding site attendance patterns by males and females of the Trinidad Leaf Frog, Phyllomedusa trinitatis. We followed attendance at a cluster of three isolated ponds over 53 and 56 consecutive nights in 2016 and 2019 respectively. Most females attended only once, but for those that attended more than once we calculated an inter-nesting interval (mean 27.6 days, N = 7). Males showed high pond fidelity, but some did attend at two of the ponds, always with a strong preference for one of them. Males showed three attendance patterns. A few attended on multiple consecutive nights (maximum, 19 nights); more were sporadic (one attended seven times over 46 nights with gaps of 15 and 19 days in the sequence); some attended only once (2016: 12, 2019: 15), but most were found to be present on multiple nights (2016: 38, 2019: 32). Our analysis suggested that these latter frogs were either newly recruited individuals or had been predated during the study. Our data show that rainfall has some influence on attendance. We found no relationship between male body condition and attendance pattern. In addition, there was no evidence that a particular male attendance pattern was optimal for breeding success.

Breeding success and population trends in Adélie penguins in areas with low and high levels of human disturbance

Polar Biology ◽  
2007 ◽  
Vol 30 (7) ◽  
pp. 917-924 ◽  
Author(s):  
A. R. Carlini ◽  
N. R. Coria ◽  
M. M. Santos ◽  
M. M. Libertelli ◽  
G. Donini
Keyword(s):  
Breeding Success ◽  
Human Disturbance ◽  
Population Trends ◽  
Adélie Penguins
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