scholarly journals Density-dependent increase in superpredation linked to food limitation in a recovering population of northern goshawks Accipiter gentilis

2017 ◽  
Vol 48 (9) ◽  
pp. 1205-1215 ◽  
Author(s):  
S. R. Hoy ◽  
S. J. Petty ◽  
A. Millon ◽  
D. P. Whitfield ◽  
M. Marquiss ◽  
...  
Keyword(s):  
Food Limitation ◽  
Accipiter Gentilis ◽  
Density Dependent ◽  
Northern Goshawks

Phylogeography, postglacial gene flow, and population history of North American Northern Goshawks (Accipiter gentilis)

The Auk ◽  
2013 ◽  
Vol 130 (2) ◽  
pp. 342-354 ◽  
Author(s):  
Shelley Bayard de Volo ◽  
Richard T. Reynolds ◽  
Sarah A. Sonsthagen ◽  
Sandra L. Talbot ◽  
Michael F. Antolin
Keyword(s):  
Gene Flow ◽  
North American ◽  
Population History ◽  
Accipiter Gentilis ◽  
History Of ◽  
Northern Goshawks

scholarly journals Nest site selection of Northern Goshawks Accipiter gentilis in Nasunogahara, Tochigi Prefecture, central Japan.

2006 ◽  
Vol 55 (2) ◽  
pp. 41-47 ◽  
Author(s):  
Reiko Horie ◽  
Koichi Endo ◽  
Jun Nonaka ◽  
Hiroki Hunatsumaru ◽  
Masaaki Koganezawa
Keyword(s):  
Site Selection ◽  
Nest Site ◽  
Nest Site Selection ◽  
Accipiter Gentilis ◽  
Central Japan ◽  
Northern Goshawks ◽  
Selection Of

scholarly journals Causes of Dispersal in Northern Goshawks (Accipiter Gentilis) in Finland

The Auk ◽  
2003 ◽  
Vol 120 (3) ◽  
pp. 706-716
Author(s):  
PATRIK BYHOLM ◽  
PERTTI SAUROLA ◽  
HARTO LINDÉN ◽  
MARCUS WIKMAN
Keyword(s):  
Prey Availability ◽  
Dispersal Distance ◽  
Accipiter Gentilis ◽  
Hatching Date ◽  
Crucial Importance ◽  
Age Classes ◽  
Fitness Consequences ◽  
Dispersal Behavior ◽  
Northern Goshawks ◽  
Correct Understanding

Abstract Environmental quality has the potential to influence dispersal if cost of dispersing is outweighed by cost of staying. In that scenario, individuals experiencing different conditions in their natal area are expected to differ in their dispersal. Even if there is wide agreement that reasons behind the dispersal decision are multiple, it is often less clear what conditions actually add to the observed dispersal behavior. The scale at which the dispersal behavior is analyzed can also be of crucial importance for a correct understanding of the dispersal process. Furthermore, in long-lived species factors influencing dispersal behavior of juveniles may differ from those adding to dispersal of adults. Using 12 years of banding data (1989–2000), we studied dispersal behavior of Northern Goshawks (Accipiter gentilis) hatched over a wide area in Finland in relation to local demographic and ecological conditions. Hatching rank and hatching date added to the probability of leaving in the first place; whereas hatching date, local prey availability, and sex of the disperser were related to dispersal distance. Among adult birds (+3 years), none of the analyzed variables were related to distance; whereas the probability of remaining locally was related to local grouse density in the hatching year (for males only). Results show that the combined effects of factors working at several levels act together on dispersal behavior in Northern Goshawks and highlight the importance of studying different age classes separately in long-lived species. In summary, our results suggest that goshawk individuals distribute themselves spatially in parallel with factors determining the costs and advantages of dispersing where philopatry seems to be connected to factors positively associated with survival; but to test the validity of that idea, more data on fitness consequences of dispersal are needed.

scholarly journals Diet and brood size in rural and urban Northern Goshawks Accipiter gentilis in southern Finland

2019 ◽  
Vol 12 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Tapio Solonen ◽  
Heikki Lokki ◽  
Seppo Sulkava
Keyword(s):  
Urban Areas ◽  
Brood Size ◽  
Positive Relationship ◽  
Urban Landscape ◽  
Breeding Habitat ◽  
Accipiter Gentilis ◽  
Rural And Urban Areas ◽  
Rural And Urban ◽  
Wilderness Area ◽  
Northern Goshawks

The brood size in the Finnish Northern Goshawks seems to be associated with the breeding habitat and the availability of suitable prey. In this study, we examined these relationships in three study areas of different landscape structure in southern Finland, including a recently colonized urban area. The most abundant prey categories found in the food remains of the goshawk included corvids, turdids, columbids, gallinaceous birds, and squirrels. Corvids dominated in the diet samples of all the study areas. The number of turdids and columbids in the samples was significantly higher in both the rural and the urban habitats than in the wilderness area. The number of gallinaceous birds was significantly higher in the wilderness area than in other habitats. Gallinaceous birds, particularly tetraonids, the traditional staple food of the Northern Goshawk in Finland, seemed to be largely compensated by corvids in the wilderness area and by corvids and columbids in the rural and urban areas. The amount of corvids in prey showed a positive relationship with brood size, suggesting some particular importance of this prey in the goshawk diet. In all, diet seemed to explain partly between-landscape variations in the brood size of the goshawk. The brood size was significantly higher in the urban landscape than elsewhere.

Serum Biochemistry Values, Plasma Mineral Levels, and Whole Blood Heavy Metal Measurements in Wild Northern Goshawks (Accipiter gentilis)

2010 ◽  
Vol 41 (4) ◽  
pp. 649-655 ◽  
Author(s):  
Jane D. Stout ◽  
David F. Brinker ◽  
Cindy P. Driscoll ◽  
Sherrill Davison ◽  
Lisa A. Murphy
Keyword(s):  
Heavy Metal ◽  
Whole Blood ◽  
Serum Biochemistry ◽  
Accipiter Gentilis ◽  
Northern Goshawks ◽  
Mineral Levels
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