Nesting dispersion of a Black Kite population in relation to location of rabbit warrens

1994 ◽  
Vol 72 (9) ◽  
pp. 1680-1683 ◽  
Author(s):  
Javier Viñuela ◽  
Rafael Villafuerte ◽  
Claudine De Le Court
Keyword(s):  
Population Density ◽  
National Park ◽  
Oryctolagus Cuniculus ◽  
Considerable Increase ◽  
Breeding Area ◽  
Doñana National Park ◽  
Main Prey ◽  
Milvus Migrans ◽  
Black Kite ◽  
Feeding Resources

Previous studies have shown that the rabbit (Oryctolagus cuniculus) is the main prey of the Black Kite (Milvus migrans) in Matasgordas (Doñana National Park, southwestern Spain), and that the reproductive success of pairs is enhanced with increasing rabbit consumption. In our study area, rabbits live mainly in large warrens patchily distributed across the breeding area of Black Kites. Rabbit consumption was higher for Black Kite pairs having warren entrances close to their nests. During the 3 years of the study, this population of Black Kites suffered a considerable increase. New pairs in the area selected nesting trees inside areas with a high density of rabbits. The pattern of Black Kite aggregation in our study area, where they breed in a "colony" with a population density among the highest recorded, can be explained, at least partially, by rabbit aggregation. Defense of feeding resources could help to explain the territorial behavior of Black Kites. Coloniality and feeding territoriality are not mutually exclusive.

scholarly journals Population status and feeding behavior of black kite (Milvus migrans) in Dhaka city, Bangladesh

2021 ◽  
Vol 9 (1-2) ◽  
pp. 35-48
Author(s):  
Md Amdadul Haque ◽  
Rasel Ahammed ◽  
Monirujjaman ◽  
Md Abraharul Islam ◽  
Md Nahid H Khan ◽  
...  
Keyword(s):  
Population Density ◽  
Feeding Behavior ◽  
Sampling Method ◽  
Population Estimation ◽  
Foraging Strategies ◽  
Dhaka City ◽  
Population Status ◽  
Milvus Migrans ◽  
Black Kite ◽  
The Status

The status and feeding behavior of black kite (Milvus migrans) in Dhaka city were studied from July 2015 to June 2017. Road transects and morning roost-count method were used for population estimation and distribution, whereas focal sampling method was used to study the feeding and foraging behavior. Based on roosting and foraging areas, five transects were selected for population estimation. Moreover, six different feeding areas were selected for identifying various types of consumed food and assessing the feeding behavior of black kite. The black kite population was estimated at (1296±5.87) in Dhaka city. The population density was estimated at 21.8/km2. Among selected five different transects, the recorded population ranged from 108.12±6.70, 8.34%) at S-3 (Mirpur to Ramna Park) to 805±11.88, 62.11% of individuals at S-5 (Gulistan to Demra). The present study revealed that black kites were distributed throughout the study area and the distribution was influenced by availability of food, water and roosting place. Based on the annual records, the highest population (1510±6.92) was found in 2016. Majority of black kites fed on offal and insects in study area. In garbage dumps, the highest rate of feeding was recorded in afternoon followed by in morning and lowest in the noon. Whereas in non-garbage feeding areas, the highest rate was recorded in the morning followed by in the afternoon and lowest in the noon. Among four different foraging strategies, food collection by kites standing on the ground and intraspecific cleptoparasitism was never observed during study period while interspecific cleptoparasitism (against crows) was the highest number (193.67±2.77, 68.43%). Jahangirnagar University J. Biol. Sci. 9(1 & 2): 35-48, 2020 (June & December)

scholarly journals Diet composition, guild structure and trophic relationships of wintering birds of prey in an estuarine wetland (The Evros Delta National Park, Greece)

2021 ◽  
Vol 39 ◽  
pp. 15-29
Author(s):  
Haralambos Alivizatos ◽  
Vassilis Goutner
Keyword(s):  
Small Mammals ◽  
National Park ◽  
Habitat Preferences ◽  
Bird Species ◽  
Trophic Relationships ◽  
Birds Of Prey ◽  
Tyto Alba ◽  
Milvus Migrans ◽  
Black Kite ◽  
Circus Aeruginosus

Seven species of birds of prey studied in the Evros Delta National Park belong to a common assemblage of a trophic guild. However, their diet study revealed different groups of feeding niches. A cluster analysis provided three groups with very similar diets: The eastern imperial eagle (Aquila heliaca) and greater spotted eagle (Clanga clanga) constituted a group feeding mainly on birds with their diets including 96% (13 bird species) and 98% (16 bird species), by number respectively, most bird prey being water birds. A second group, characterized by a considerable variety of prey types dominated by small mammals and birds, included the western marsh harrier (Circus aeruginosus) (67% mammals, 27% birds -at least 12 species ), black kite (Milvus migrans) (46% mammals, 39% birds -at least 11 species) and common  buzzard (Buteo buteo) (birds 36% -at least 7 species, mammals 22%). In all three species, birds dominated by biomass, whereas other prey such as arthropods (mainly insects), amphibians and reptiles had a low contribution by mass where they occurred. A third group included the common barn owl (Tyto alba), feeding mainly on small mammals (97%, at least 12 species) and little owl (Athene noctua). The little owl’s diet consisted of mammals (29%, -at least 6 species), birds (5% -at least 7 species) and, though insects preponderated by number (64%), mammals were dominant by biomass in both owls. Diversity indices estimated on class level were low, ranked as B. buteo > M. migrans > A. noctua > C. aeruginosus > A. heliaca = T. alba > A. clanga. Dietary similarities may be partly due to common habitat preferences and the role of other potential factors to niche partitioning is discussed.

Gran Paradiso: Erkenntnisse aus der sich natürlich regulierenden Steinbockpopulation|Gran Paradiso: Conclusions from the naturally regulated Capricorn population

2007 ◽  
Vol 158 (11) ◽  
pp. 349-352
Author(s):  
Grégory Amos ◽  
Ambroise Marchand ◽  
Anja Schneiter ◽  
Annina Sorg
Keyword(s):  
Nineteenth Century ◽  
Population Density ◽  
National Park ◽  
Optimal Management ◽  
Capra Ibex ◽  
Large Fluctuations ◽  
The Alps ◽  
Gran Paradiso ◽  
Gran Paradiso National Park

The last Capricorns (Capra ibex ibex) in the Alps survived during the nineteenth century in the Aosta valley thanks to the royal hunting reservation (today Gran Paradiso national park). Capricorns from this reservation were successfully re-introduced in Switzerland after its Capricorn population had disappeared. Currently in Switzerland there are 13200 Capricorns. Every year 1000 are hunted in order to prevent a large variation and overaging of their population and the damage of pasture. In contrast, in the Gran Paradiso national park the game population regulates itself naturally for over eighty years. There are large fluctuations in the Capricorn population (2600–5000) which are most likely due to the climate, amount of snow, population density and to the interactions of these factors. The long-term surveys in the Gran Paradiso national park and the investigations of the capacity of this area are a valuable example for the optimal management of the ibexes in Switzerland.

Climate Influence Vs. Local Drivers in Surface Water-Groundwater Interactions in Eight Ponds of Doñana National Park (Southern Spain)

Wetlands ◽  
2021 ◽  
Vol 41 (2) ◽  
Author(s):  
Miguel Rodríguez-Rodríguez ◽  
Héctor Aguilera ◽  
Carolina Guardiola-Albert ◽  
Ana Fernández-Ayuso
Keyword(s):  
Surface Water ◽  
National Park ◽  
Southern Spain ◽  
Doñana National Park

A survey of shared pathogens at the domestic‐wild ruminants’ interface in Doñana National Park (Spain)

2021 ◽  
Author(s):  
S. Jiménez‐Ruiz ◽  
I. García‐Bocanegra ◽  
P. Acevedo ◽  
J. Espunyes ◽  
R. Triguero‐Ocaña ◽  
...  
Keyword(s):  
National Park ◽  
Doñana National Park ◽  
Wild Ruminants
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