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Development of the Goshawk Accipiter gentiles population in Sweden since 1975. / Duvhökens Accipiter gentilis beståndsutveckling i Sverige sedan 1975.

Svensson, Sören LU (2002) In Ornis Svecica 12(3). p.147-156
Abstract
I have used data, mainly from south of 62degreeN, collected within the Breeding Bird Survey and the Winter Bird Count (1975-2001) to describe the population development of the Goshawk Accipiter gentilis in Sweden. The data from the breeding season indicate a considerable population increase. The winter data show a stable population for the winters 1975/1976-1993/94, then six winters with lower values, and a return to the former mean level in 2000/2001. The linear trend for the whole period shows a decline of almost 20%. The winter data are difficult to interpret in terms of breeding population since a large proportion of the hawks are wintering birds from northern Sweden and Finland. The conclusion is that the number of overwintering... (More)
I have used data, mainly from south of 62degreeN, collected within the Breeding Bird Survey and the Winter Bird Count (1975-2001) to describe the population development of the Goshawk Accipiter gentilis in Sweden. The data from the breeding season indicate a considerable population increase. The winter data show a stable population for the winters 1975/1976-1993/94, then six winters with lower values, and a return to the former mean level in 2000/2001. The linear trend for the whole period shows a decline of almost 20%. The winter data are difficult to interpret in terms of breeding population since a large proportion of the hawks are wintering birds from northern Sweden and Finland. The conclusion is that the number of overwintering Goshawks in southern Sweden has declined, especially in recent years, but that the breeding population has increased, or - considering the weak summer data - at least not declined during the last quarter of a century. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ornis Svecica
volume
12
issue
3
pages
147 - 156
publisher
Sveriges Ornitologiska Förening
ISSN
1102-6812
language
English
LU publication?
yes
id
d164fb1c-5fb8-4600-b382-6dda69ddde98 (old id 153154)
date added to LUP
2007-06-25 11:08:24
date last changed
2016-04-16 03:22:07
@article{d164fb1c-5fb8-4600-b382-6dda69ddde98,
  abstract     = {I have used data, mainly from south of 62degreeN, collected within the Breeding Bird Survey and the Winter Bird Count (1975-2001) to describe the population development of the Goshawk Accipiter gentilis in Sweden. The data from the breeding season indicate a considerable population increase. The winter data show a stable population for the winters 1975/1976-1993/94, then six winters with lower values, and a return to the former mean level in 2000/2001. The linear trend for the whole period shows a decline of almost 20%. The winter data are difficult to interpret in terms of breeding population since a large proportion of the hawks are wintering birds from northern Sweden and Finland. The conclusion is that the number of overwintering Goshawks in southern Sweden has declined, especially in recent years, but that the breeding population has increased, or - considering the weak summer data - at least not declined during the last quarter of a century.},
  author       = {Svensson, Sören},
  issn         = {1102-6812},
  language     = {eng},
  number       = {3},
  pages        = {147--156},
  publisher    = {Sveriges Ornitologiska Förening},
  series       = {Ornis Svecica},
  title        = {Development of the Goshawk Accipiter gentiles population in Sweden since 1975. / Duvhökens Accipiter gentilis beståndsutveckling i Sverige sedan 1975.},
  volume       = {12},
  year         = {2002},
}