scholarly journals Adult colouration of the Bearded Vulture ( Gypaetus barbatus ) in the Pyrenees: relation to sex, mating system and productivity

Ibis ◽  
2021 ◽  
Author(s):  
Stéphane Duchateau ◽  
Gonzalo Chéliz ◽  
Juan Antonio Gil ◽  
Pascual López‐López
Ibis ◽  
2018 ◽  
Vol 162 (1) ◽  
pp. 153-161 ◽  
Author(s):  
Tulsi Ram Subedi ◽  
José D. Anadón ◽  
Hem Sagar Baral ◽  
Munir Z. Virani ◽  
Shahrul Anuar Mohd Sah

2002 ◽  
Vol 12 (3) ◽  
pp. 269-280 ◽  
Author(s):  
Stavros Xirouchakis ◽  
Manolis Nikolakakis

We carried out a four-year (1995-1999) survey on the foraging and breeding distribution of Bearded Vulture Gypaetus barbatus on the island of Crete. The age classes of all birds sighted were systematically recorded and data on seasonal distribution patterns were collected; 262 observations were made covering an area of about 4,000 km2, at altitudes ranging from 200 m to 2,450 m a.s.l (mean 1,100 m). Adult birds were distributed evenly throughout the island while young birds avoided active territories and were mostly sighted at the periphery of the high mountains. The species depended almost entirely on domestic livestock herded into and away from the mountains seasonally, with birds foraging in the uplands (> 1,200 m a.s.l.) from early May to late October and frequenting midland pastures (600-1,200 m a.s.l.) for the rest of the year. The mean altitude of nesting sites was 750 m (range = 280-1,450 m), with 80% of nests positioned below the 1,000 m contour. Bearded Vultures are more vulnerable to human-induced mortality within their breeding territories and on midland pastures in winter than in the upland areas in summer.


2008 ◽  
Vol 55 (3) ◽  
pp. 309-312 ◽  
Author(s):  
Cristina Belén García ◽  
Jesús Antonio Insausti ◽  
Juan Antonio Gil ◽  
Ángel de Frutos ◽  
Manuel Alcántara ◽  
...  

Ostrich ◽  
2020 ◽  
Vol 91 (2) ◽  
pp. 118-128
Author(s):  
Christiaan W Brink ◽  
Sonja Krüger ◽  
Arjun Amar

2013 ◽  
Vol 24 (2) ◽  
pp. 162-177 ◽  
Author(s):  
SONJA C. KRÜGER ◽  
DAVID G. ALLAN ◽  
ANDREW R. JENKINS ◽  
ARJUN AMAR

SummaryTerritory occupancy, distribution and density of the isolated Bearded VultureGypaetus barbatus meridionalispopulation in the Maloti-Drakensberg mountains of southern Africa were assessed between two time periods - former (1960–1999) and current (2000–2012) - to identify population trends. Overall, 190 territories were recorded of which 109 are currently occupied. The number of occupied breeding territories decreased by a minimum of 32% and a maximum of 51% over the past five decades. Territories located on the periphery of the breeding range were more likely to be abandoned than those in the core. The current population is estimated at a minimum of 352 and a maximum of 390 individuals. The breeding range decreased by 27%, restricting the birds to an estimated area of occupancy of 28,125 km2. Breeding densities also decreased by 20%, declining from 4.9 to 3.9 pairs/1,000 km2. In both periods, higher densities were recorded in the core of the range. Nests were located about 9.0 km apart, a slight increase from the 7.7 km recorded formerly. Inter-nest distances increased with distance from the core range. Further studies are required to ascertain whether productivity or survival is limiting population growth, and whether anthropogenic influences are resulting in the abandonment of territories in the periphery of the range and the subsequent decline in numbers.


Ibis ◽  
2003 ◽  
Vol 145 (2) ◽  
pp. 244-252 ◽  
Author(s):  
Antoni Margalida ◽  
Diego Garcia ◽  
JOAN Bertran ◽  
Rafael Heredia

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