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Estimating turnover rate of breeding Eastern Imperial Eagle by visual identification of individuals

Bedřich Landsfeld Jiří Pavelka

Raptor Protection of Slovakia www.dravce.sk 7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


Raptor Protection of Slovakia, www.dravce.sk

• Monitoring was carried out in Považský Inovec Mountains – Western Slovakia. • 3 nesting pairs under regular survey:  Pair Nr. 1 - 36 years (since 1977, known pair, the site has been occupied since 1950s)  Pair Nr. 2 - 2 years (from the beginning of the nesting – a new pair)  Pair Nr. 3 - 9 years (detto)

7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


Raptor Protection of Slovakia, www.dravce.sk

Determination of individuals • The basic premise by estimating of the turnover rate is identification of individuals. Mostly from camera pictures we identified the variability in color and plumage patterns, especially:

color of forehead size and dislocation of white scapular-patches

color of frontal wing edge

• Based on these differences individuals can be identified with high success. 7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


Raptor Protection of Slovakia, www.dravce.sk

Overview of breeding Pair Nr. 1 year

nest

tree

1977

H1

Beech

change age M age F pull. fledglings ad

1978

H1

Beech

ad

1979

H1

Beech

F

ad

4-5

1980

H1

Beech

M

ad

Change of colour in columns = change of - nest - nesting tree - male or - female.

3

6

1981

4

7

do not nest

1982

5

8

do not nest

1983

H2

Larch

6

9

1984

H3

Spruce

7

10

2

1

1985

H3

Spruce

8

11

2

1

1986

H3

Spruce

9

12

1

1

1987

H3

Spruce

10

13

1

1

1988

H3

Spruce

11

14

1989

H4

Larch

12

15

0

0

1990

H5

Beech

13

16

0

0

1991

H6

Larch

2

17

1

1

1992

H6

Larch

3

18

0

0

1993

H7

Spruce

4

19

2

2

1994

H7

Spruce

5

20

0

0

1995

H7

Spruce

6

21

1996

H8

Larch

7

22

0

0

1997

H9

Spruce

8

23

0

0

1998

H 10

Spruce

3

24

0

0

1999

H 11

4

25

0

0

2000

H 12

Acacia Beech

5

26

2

2

2001

H 13 Black Pine

6

27

1

1

2002

H 13 Black Pine

7

28

1

2003

H 13 Black Pine

8

29

2004

H 13 Black Pine

9

2005

H 14 Black Pine

10

2006

H 14 Black Pine

2007

H 15 Black Pine

2008

H 14 Black Pine

2009

H16 Black Pine

2010

H16 Black Pine

2011

M

M

Dark blue – female from pair Nr. 2 moved to pair Nr.1 Orange - female from pair Nr.3 moved to pair Nr.1 • Each nest (H) marked with different number

Pair Nr. 2 nest

tree

1

H1

Black Pine

2

1

H2

Black Pine

ad

2

2

ad

1

1

H3

Black Pine

11

ad

2

2

H4

12

ad

2

2

3

3

2

2

4

4

5

ad

0

H17 Black Pine

6

ad

2012

H18 Black Pine

7

2013

H19 Black Pine

4

36 years

F

M+F F

M+F diameter

age F

pull.

fledgling s

3

ad

2

2

nest

tree

4

ad

2

2

H1

Poplar

H2

6

ad

2

0

H3

Scots Pine

7

ad

3

2

H5

Black Pine

8

ad

2

H6

Black Pine

9

ad

H7

Black Pine

10

0

H7

Black Pine

1

1

H7

ad

3

0

14

2

2

1

0,89

5,7 5,8

change age M

Pair Nr.3 pull.

Poplar

chang age M age F e ? ? subad. M 3

2

fledgli ngs 2

Poplar

4

6

0

0

2

H4

Poplar

5

0

7

1

2

H5

Poplar

1

6

8

2

2

2

H6

0

Black Pine

7

9

3

ad

2

2

3

H7

Poplar

8

10

2

4

ad

2

1

2

H8

Poplar

9

11

1

Black Pine

5

ad

0

1

1

H9

Poplar

10

12

2

H8

Black Pine

6

2

ad

2

1

H10

Poplar

11

13

2

H8

Black Pine

2

7

ad

0

0

6

5,5

1,8

1,45

9

9

1,70

1

5

12 year

F

M

diameter

10(9) years

7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia

diameter


Raptor Protection of Slovakia, www.dravce.sk

CHANGE OF INDIVIDUAL IN A PAIR Average time of breeding in one pair – males (M) = 6,88 years

7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


Raptor Protection of Slovakia, www.dravce.sk

CHANGE OF INDIVIDUAL IN A PAIR Average time of breeding in one pair – females (F) = 6,88 years

7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


Raptor Protection of Slovakia, www.dravce.sk

CHANGE OF NESTS • Intensity of changing nests was higher than change of individuals.

Average time of use of one nest (years)

The longest period of occupation of one nest (years)

Pair Nr. 1

1,89

5

Pair Nr. 2

1,38

3

Pair Nr. 3

1

1

• Total average time of use of nest by all three pairs - 1,51 year / nest.

• No pair was using an old nest after leaving it!!!

7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


Raptor Protection of Slovakia, www.dravce.sk

NESTING TREES Pair Nr. 1 - instead the original nesting trees Beeches (Fagus sylvatica) the pair started to prefer Larch (Larix decidua), Spruce (Picea abies) and finally Black Pine (Pinus nigra) in recent time. Pair Nr. 2 - built nests exclusively on Black Pine (Pinus nigra), only once on Scots Pine (Pinus sylvestris).

Pair Nr. 3 - nesting almost always in agrocenosis, specifically on Poplars (Populus sp.), only once the pair moved to the foothills and built a nest on Black Pine (Pinus nigra).

7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


THANK YOU FOR YOUR ATTENTION 7th International Conference on the Conservation of the Eastern Imperial Eagle 2.-5. October 2013 Bratislava, Slovakia


Estimating turnover rate of breeding Eastern Imperial Eagle by visual identification of individuals