TBOSG     S. Glos Breeding Bird Survey 2009

 

 

THE

BREEDING BIRDS

OF SOUTH GLOUCESTERSHIRE

2009

 

A SURVEY BY MEMBERS OF THE BRITISH TRUST FOR ORNITHOLOGY [AVON REGION]

BRISTOL NATURALISTS SOCIETY & BRISTOL ORNITHOLOGICAL CLUB

Introduction

This report is the result of the work of many members of the above organisations, their names are at the end of this report and we are very grateful for their efforts. This survey started in 1994 and has now covered 16 breeding seasons.

Method

The method used is that of the British Trust for Ornithology’s Breeding Bird Survey.  The surveyors are birdwatchers who are able to recognise all the species by sight and song. They walk 2km within a square kilometre, early in the morning when bird activity is at its greatest. Two recording visits are made, one between April 1st and May 15th and a second at least four weeks later and before the end of June.

Results

The surveyors spent over 124 hours counting 14,315 birds of 77 species to establish the numbers and distribution of breeding bird species of South Gloucestershire. They visited 42 square kilometers that is 8.5% of the area.

Table 1 summarises the total counts and percentage distribution of each species. The method of this survey does not accurately count the number of pairs breeding. However, if they are in the area in reasonable numbers during the spring, then they are likely to breed. This method avoids the need to disturb the birds by inspecting the nests.

Table 1 - S. Gloucestershire

 

 

 

 

 

Species

total

%dist

 

Species

total

%dist

Cormorant**

8

10

 

Robin

643

100

Little Egret**

2

2

 

Wheatear**

6

5

Grey Heron

9

17

 

Blackbird

982

100

Mute Swan

4

2

 

Song Thrush

219

88

Canada Goose

32

12

 

Mistle Thrush

27

31

Mallard

131

52

 

Sedge Warbler

13

7

Sparrowhawk

7

12

 

Lesser Whitethroat

7

14

Buzzard

47

60

 

Whitethroat

101

62

Kestrel

13

26

 

Garden Warbler

9

21

Hobby

1

2

 

Blackcap

221

86

Red-legged Partridge

27

19

 

Chiffchaff

269

93

Grey Partridge

2

2

 

Willow Warbler

46

50

Pheasant

168

62

 

Goldcrest

22

24

Moorhen

29

24

 

Long-tailed Tit

88

43

Coot

3

2

 

Marsh Tit

3

2

Lapwing*

6

2

 

Coal Tit

21

29

Common Gull**

3

2

 

Blue Tit

522

98

Lesser Black-backed Gull

137

48

 

Great Tit

329

95

Herring Gull

256

55

 

Nuthatch

2

5

Feral Pigeon

96

26

 

Treecreeper

6

5

Stock Dove

88

45

 

Jay

36

45

Woodpigeon

1625

100

 

Magpie

330

88

Collared Dove

158

71

 

Jackdaw

1171

86

Cuckoo

2

5

 

Rook

1049

62

Barn Owl

1

2

 

Carrion Crow

981

100

Little Owl

4

7

 

Raven

14

17

Tawny Owl

3

5

 

Starling

538

71

Swift

71

43

 

House Sparrow

537

71

Kingfisher

3

5

 

Chaffinch

504

98

Green Woodpecker

71

55

 

Greenfinch

320

86

Great Spotted Woodpecker

28

40

 

Goldfinch

200

71

Skylark

254

52

 

Linnet

80

33

Swallow

479

93

 

Lesser Redpoll**

1

2

House Martin

161

40

 

Bullfinch

28

36

Meadow Pipit

11

5

 

Yellowhammer

97

48

Yellow Wagtail

3

2

 

Reed Bunting

2

2

Grey Wagtail

14

12

 

Corn Bunting

27

17

Pied Wagtail

23

29

 

TOTAL

14315

 

Wren

632

95

 

Time [mins]

7479

 

Dunnock

252

86

 

Birds per hour

115

 

Table 1 contains three types of birds – definite breeders with no mark, possible breeders with a * and non-breeders with **. The method of survey does not count shy, nocturnal or rare species that are known to nest or possibly nest within the South Gloucestershire boundary. Species which need to be added to the definite breeders in 2009 are Barnacle Goose, Shelduck, Mandarin Duck, Tufted Duck, Goshawk, Peregrine, Oystercatcher, Dipper, Nightingale, Stonechat, Cetti’s Warbler and Reed Warbler. Possible nesters not recorded in the survey were Little Grebe, Quail, Sand Martin, Grasshopper Warbler, Spotted Flycatcher and Tree Sparrow. The total of 83 breeding species and 7 possibles is a measure of the biodiversity in South Gloucestershire in 2009.

Table 2 -Highest counts SG

 

 

 Percentage distribution 

1

Woodpigeon [1]

1625

 

1=

Blackbird [100%]

100%

2

Jackdaw [2]

1171

 

1=

Carrion Crow [100%]

100%

3

Rook [5]

1049

 

1=

Robin [100%]

100%

4

Blackbird [3]

982

 

1=

Woodpigeon [100%]

100%

5

Carrion Crow [4]

981

 

5=

Blue Tit [98%]

98%

6

Robin [8]

643

 

5=

Chaffinch [100%]

98%

7

Wren [6]

632

 

7=

Great Tit [95%]

95%

8

Starling [7] 

538

 

7=

Wren [98%]

95%

9

House Sparrow [9]

537

 

9=

Chiffchaff  [95%]

93%

10

Blue Tit [11]

522

 

9=

Swallow [83%]

93%

11

Chaffinch [10]

504

 

11=

Magpie [90%]

88%

12

Swallow [12]

479

 

11=

Song Thrush [85%]

88%

13

Magpie [14]

330

 

13=

Blackcap [70%]

86%

14

Great Tit [13]

329

 

13=

Dunnock [88%]

86%

15

Greenfinch  [17]

320

 

13=

Greenfinch [73%]

86%

16

Chiffchaff [16]

269

 

13=

Jackdaw [85%]

86%

17

Herring Gull [-]

256

 

17=

Collared Dove [65%]

71%

18

Skylark [15]

254

 

17=

Goldfinch [73%]

71%

19

Dunnock [18]

252

 

17=

House Sparrow [70%]

71%

20

Blackcap [-]

221

 

17=

Starling [75%]

71%

         

2008 positions and distributions in brackets. 

 

Percentage changes last year and since 2000, for the most numerous species

 

Species change

08/09

00/09

 

 

08/09

00/09

Woodpigeon

4

-5

 

Chiffchaff

-4

-25

Collared Dove

-19

41

 

Blue Tit

-6

-17

Swift

-52

-55

 

Great Tit

-17

-1

Skylark

-16

-15

 

Magpie

-9

-11

Swallow

12

74

 

Jackdaw

-11

2

House Martin

4

-17

 

Rook

41

-35

Wren

-10

-22

 

Carrion Crow

-13

-11

Dunnock

-4

-3

 

Starling

-27

-46

Robin

7

54

 

House Sparrow

-11

-19

Blackbird

-15

-2

 

Chaffinch

-9

-8

Song Thrush

-3

-6

 

Greenfinch

20

-44

Blackcap

19

5

 

Goldfinch

17

-6

 

The percentage changes of the most numerous species are based on 40 squares that were covered in 2008 and 2009 by the same observer. In the last year, 8 of the species increased while 16 decreased.

House Sparrow is now showing a slow decline over the medium term.

The Skylark numbers oscillate but are now lower than the 2000 level.

 South Gloucestershire breeding populations in 2009

Wren

15500

 

Carrion Crow

3000

Robin

15000

 

Goldfinch

3000

Blue Tit

13000

 

Starling

2800

Blackbird

12500

 

Song Thrush

2200

House Sparrow

10000

 

Skylark

2000

Great Tit

8800

 

House Martin

1700

Woodpigeon

7200

 

Magpie

1200

Dunnock

6600

 

Whitethroat

1200

Rook

5600

 

Yellowhammer

1100

Chaffinch

4700

 

Linnet

1000

Jackdaw

3800

 

Collared Dove

900

Swallow

3800

 

Mallard

500

Greenfinch

3600

 

Swift

500

Chiffchaff

3400

 

 

 

Blackcap

3300

 

Total

137900

 The table gives our breeding estimates for the most numerous species, which together with all the other species brings the total breeding population of South Gloucestershire to about 141,000 pairs of birds.

Richard Bland & John Tully - Avon BTO, August 2009 [johntully4@aol.com]

One km squares surveyed

5485*  5784     6088* 6089* 6178*   6187*   6295* 6386*  6388*  6389*  6390*  6479*  6490*

6578*  6680* 6682     6780*  6788*  6873*  6874*  6876* 6883*  6976*  6977*  7072*   7375*

7475*  7486*  7487*  7572*   7581*   7675*  7679*  7685*  7773*   7774*  7784*  7873*  7874*

7879*  7973*  7986*

* = coverage in 2008 and 2009

Thanks to the following surveyors:-

Rodney Artingstall, Peter & Barbara Atkey, Michael Baker, John Barnett, Richard Bland, John Bowker, David Bull, Ken Cook, Jane Cumming, Geoff Davies, Graeme Down, Tony Dudman, Phyl Dykes, William Earp, Steve & Jane Gilliard, Margaret Gorely, Mike Jackson, Andrew Jordan, Adrian Jowitt, John Martin, Colin Morris, Chris Perry, Richard Scantlebury & Keith Williams, John Shepherd, Charles Stapleton, Roger Steer, David Stoddard, David Teague, John Tully, Paul White, Hazel Willmott, Gordon Youdale.

 

Home