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 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.

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

scholarly journals Breeding success and breeding population trends of waterfowl: implications for monitoring

2011 ◽  
Vol 17 (3) ◽  
pp. 225-239 ◽  
Author(s):  
Mia Rönkä ◽  
Lennart Saari ◽  
Martti Hario ◽  
Jari Hänninen ◽  
Esa Lehikoinen
Keyword(s):  
Breeding Success ◽  
Breeding Population ◽  
Population Trends

The importance of land-based prey for sympatrically breeding giant petrels at sub-Antarctic Marion Island

2007 ◽  
Vol 19 (1) ◽  
pp. 25-30 ◽  
Author(s):  
P.J. Nico de Bruyn ◽  
John Cooper ◽  
Marthán N. Bester ◽  
Cheryl A. Tosh
Keyword(s):  
Breeding Success ◽  
Population Regulation ◽  
Elephant Seal ◽  
Population Trends ◽  
Southern Elephant Seal ◽  
Marion Island ◽  
Giant Petrel ◽  
Mirounga Leonina

Northern (Macronectes halli) and southern (M. giganteus) giant petrels breed at different times at sub-Antarctic Marion Island. Long-term census and breeding success data are used to test for competitive overlap between the two species by correlating population trends with those of land-based prey/carrion species. No parameter was singularly important in population regulation of either giant petrel species and the assumed dependence of breeding northern giant petrels on southern elephant seal Mirounga leonina carrion is not entirely supported.

scholarly journals Population trends of Black Vulture Aegypius monachus in Dadia Forest, north-eastern Greece following the establishment of a feeding station

1999 ◽  
Vol 9 (2) ◽  
pp. 113-118 ◽  
Author(s):  
Christos G. Vlachos ◽  
Dimitri E. Bakaloudis ◽  
Graham J. Holloway
Keyword(s):  
Endangered Species ◽  
Breeding Success ◽  
Breeding Birds ◽  
Population Trends ◽  
Monitoring Programme ◽  
Birds Of Prey ◽  
Feeding Station ◽  
North Eastern ◽  
Black Vulture ◽  
Wildlife Reserve

SummaryDadia Forest in north-eastern Greece is well known for its diversity of breeding birds of prey. In 1980, the area was declared a wildlife reserve. One of the most endangered species at that time was the Black Vulture Aegypius monachus. To help the population of Black Vultures a feeding station was established in 1987. A monitoring programme from 1984 until present indicates that the operation of the feeding station has coincided with an increase in the numbers of Black Vultures wintering in Dadia by nearly threefold, an increase in the number of breeding pairs from 10 to 21, and an increase in breeding success from 40% to a peak of 95%. A slight faltering in the continued rise in the numbers of Black Vultures in Dadia is attributed to a poisoning event in 1995.

scholarly journals How animals distribute themselves in space: energy landscapes of Antarctic avian predators

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Juan F. Masello ◽  
Andres Barbosa ◽  
Akiko Kato ◽  
Thomas Mattern ◽  
Renata Medeiros ◽  
...  
Keyword(s):  
Breeding Success ◽  
Physiological Stress ◽  
Energy Landscape ◽  
Energy Gain ◽  
Population Trend ◽  
Population Trends ◽  
Energy Costs ◽  
Energy Landscapes ◽  
Animal Populations ◽  
Positive Population

Abstract Background Energy landscapes provide an approach to the mechanistic basis of spatial ecology and decision-making in animals. This is based on the quantification of the variation in the energy costs of movements through a given environment, as well as how these costs vary in time and for different animal populations. Organisms as diverse as fish, mammals, and birds will move in areas of the energy landscape that result in minimised costs and maximised energy gain. Recently, energy landscapes have been used to link energy gain and variable energy costs of foraging to breeding success, revealing their potential use for understanding demographic changes. Methods Using GPS-temperature-depth and tri-axial accelerometer loggers, stable isotope and molecular analyses of the diet, and leucocyte counts, we studied the response of gentoo (Pygoscelis papua) and chinstrap (Pygoscelis antarcticus) penguins to different energy landscapes and resources. We compared species and gentoo penguin populations with contrasting population trends. Results Between populations, gentoo penguins from Livingston Island (Antarctica), a site with positive population trends, foraged in energy landscape sectors that implied lower foraging costs per energy gained compared with those around New Island (Falkland/Malvinas Islands; sub-Antarctic), a breeding site with fluctuating energy costs of foraging, breeding success and populations. Between species, chinstrap penguins foraged in sectors of the energy landscape with lower foraging costs per bottom time, a proxy for energy gain. They also showed lower physiological stress, as revealed by leucocyte counts, and higher breeding success than gentoo penguins. In terms of diet, we found a flexible foraging ecology in gentoo penguins but a narrow foraging niche for chinstraps. Conclusions The lower foraging costs incurred by the gentoo penguins from Livingston, may favour a higher breeding success that would explain the species’ positive population trend in the Antarctic Peninsula. The lower foraging costs in chinstrap penguins may also explain their higher breeding success, compared to gentoos from Antarctica but not their negative population trend. Altogether, our results suggest a link between energy landscapes and breeding success mediated by the physiological condition.

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