2016 CES Results

The Constant Effort Sites (CES) ringing scheme is one of two standardised national ringing projects run by the BTO. Participants monitor 24 common migrant and resident songbird species in woodland, scrub and reedbed habitats, catching birds in mist nets placed in the same locations, for the same length of time during 12 visits made between May and August each year. The consistent approach means that changes in numbers caught over time can be attributed to population change rather than variation in effort. Ratios of adults to juveniles caught allow breeding success to be assessed while, as with all ringing, recaptures in subsequent years provide information on adult survival.

CES results received by October are analysed alongside results from the Nest Record Scheme (NRS) in November each year and a preliminary report on the breeding season is produced. Once all the results are received, the final results are produced and reported on, alongside the full NRS and Retrapping Adults for Survival (RAS) results, in the spring edition of LifeCycle. CES results are also published in the annual BirdTrends report.

Long-term results

 

Number of datasets received per year

Number of birds ringed through CES per year

2016 results

The following tables show CES results for 2016 and are provided both at a national level and broken down by country and habitat. .
 

Number of sites

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

Total

109

12

10

2

1

134

Dry scrub

47

6

2

-

-

55

Wet scrub

27

3

3

-

1

34

Reedbed

22

2

4

2

-

30

Woodland

13

1

1

-

-

15

 

Number of individual birds caught

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

Total

39,056 (84%)

3,520 (8%)

3,243 (7%)

600 (1%)

239 (1%)

46,658

Adults

16,597 (42%)

1,414 (40%)

1,609 (50%)

205 (34%)

101 (42%)

19,926

Juveniles

22,459 (58%)

2,106 (60%)

1,634 (50%)

395 (66%)

138 (58%)

      26,732

 

Number of individual birds caught by habitat

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

Dry scrub

16,165 (41%)

2,009 (57%)

616 (19%)

-

-

18,790 (40%)

Adult

Juvenile

6,829 (42%)

9,336 (58%)

750 (37%)

1,259 (63%)

269 (44%)

347 (56%)

-

-

7,848 (42%)

10,942 (58%)

Wet scrub

10,823 (28%)

650 (18%)

1,209 (37%)

-

239 (100%)

12,921 (28%)

Adult

Juvenile

4,483 (41%)

6,341 (59%)

267 (41%)

383 (59%)

546 (45%)

663 (55%)

-

101 (42%)

138 (58%)

5,396 (42%)

7,525 (58%)

Reedbed

8,117 (21%)

579 (16%)

1,224 (38%)

600 (100%)

-

10,520 (23%)

Adult

Juvenile

3,471 (43%)

4,646 (57%)

238 (41%)

341 (59%)

674 (55%)

550 (45%)

205 (34%)

395 (66%)

-

4,588 (44%)

5,932 (56%)

Woodland

3,951 (10%)

282 (8%)

194 (6%)

-

-

4,427 (9%)

Adult

Juvenile

1,815 (46%)

2,136 (54%)

159 (56%)

123 (44%)

120 (62%)

74 (38%)

-

-

2,094 (47%)

2,333 (53%)

 

Average number of individual birds caught per site (range given in brackets)

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

National

358

(92–858)

293

(185–490)

324

(165–591)

300

(276–324)

239

348

(92–858)

Adult

Juvenile

152 (47–368)

206 (30–603)

118 (55–185)

176 (109–305)

161 (69–367)

163 (53–428)

103 (83–122)

198 (154–241)

101

138

149 (47–368)

199 (30–603)

Dry scrub

351

(92–858)

335

(222–490)

308

(263-353)

-

-

342

(92–858)

Adult

Juvenile

148 (47–368)

203 (30–603)

125 (88–185)

210 (122–305)

135 (132–137)

174 (131–216)

-

-

-

-

145 (47–368)

203 (30–603)

Wet scrub

401

(112–770)

217

(185–269)

403

(175–780)

-

239

380

(112–780)

Adult

Juvenile

166 (62–346)

235 (50–435)

89 (55–136)

128 (109–141)

182 (73–352)

221 (102–428)

-

-

138

101

159 (55–352)

221 (50–435)

Reedbed

369

(146–615)

290

(254–325)

306

(165–591)

300

(276–324)

-

351

(146–615)

Adult

Juvenile

158 (47–271)

211 (84–415)

119 (118–120)

171 (134–207)

169 (69–367)

138 (53–224)

103 (83–122)

198 (154–241)

-

-

153 (47–367)

198 (53–415)

Woodland

304

(144–470)

282

194

-

-

295

(144–470)

Adult

Juvenile

140 (49–233)

164 (57–277)

159

123

120

74

-

-

-

-

140 (49–233)

157 (57–277)

 

Number of species caught

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

Total

86

47

47

33

24

88

Dry scrub

74

38

33

-

-

74

Wet scrub

56

31

37

-

24

60

Reedbed

52

29

34

33

-

60

Woodland

56

21

18

-

-

58

 

Average number of species caught per site (range given in brackets)

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

National

24 (12–35)

23 (18–27)

23 (18–31)

26 (21–30)

24

24 (12–35)

Dry scrub

24 (16–35)

24 (18–27)

26 (24–28)

-

-

24 (15 – 35)

Wet scrub

25 (18–31)

23 (20–24)

24 (18–31)

-

24

24 (18 – 31)

Reedbed

22 (12–29)

22 (20–23)

23 (19–30)

26 (21–30)

-

23 (12 – 30)

Woodland

24 (16–31)

21

18

-

-

23 (16 – 31)

 

Average net length per site metres / feet (range given in brackets in metres, then feet)

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

National

139 / 457

117 / 384

130 / 425

110 / 361

116 / 381

135 / 443

Dry scrub

139 / 455

(69–279)

(226–914)

111 / 365

(101–134)

(330–440)

123 / 403

(112–134)

(366–440)

-

-

135 / 443

(69–279)

(226–915)

Wet scrub

142 / 466

(58–262)

(190–860)

100 / 328

(73–146)

(240–480)

114 / 376

(60–165)

(197–540)

-

116 / 381

-

-

135 / 443

(58–262)

(190–860)

Reedbed

133 / 437

(70–201)

(230–660)

166 / 545

(122–210)

(400–690)

155 / 510

(73–232)

(240–760)

110 / 361

-

-

-

137 / 449

(70–232)

(230–761)

Woodland

146 / 478

(79–210)

(260–690)

104 / 340

-

-

85 / 280

-

-

-

-

139 / 456

(79–210)

(259–689)

 

Average number of individual birds caught per metre / foot of net (top figure in metres, second figure in feet)

England

Scotland

Wales

Republic of Ireland

Northern Ireland

Overall

Nationally

2.6

0.8

2.5

0.8

2.5

0.76

2.7

0.8

2.1

0.6

2.6

0.8

Dry scrub

2.5

0.8

3.0

0.9

2.5

0.8

-

-

2.5

0.8

Wet scrub

2.8

0.9

2.2

0.7

3.5

1.1

-

2.1

0.6

2.8

0.9

Reedbed

2.8

0.8

1.7

0.5

2.0

0.6

2.7

0.8

-

2.6

0.8

Woodland

2.1

0.6

2.7

0.8

2.3

0.7

-

-

2.1

0.6

 

Most caught species (all habitats)

Overall

England

Scotland

Reed Warbler (5,501)

Chiffchaff (4,749)

Blackcap (4,296)

Wren (3,349)

Willow Warbler (3,032)

Robin (2913)

Sedge Warbler (2635)

Blue Tit (2552)

Dunnock (2052)

Blackbird (1837)

Great Tit (1818)

Whitethroat (1806)

Long-tailed Tit (1625)

Bullfinch (1280)

Garden Warbler (864)

Reed Warbler (5,027)

Chiffchaff (4,156)

Blackcap (3,813)

Wren (2,720)

Robin (2,387)

Blue Tit (2165)

Willow Warbler (2065)

Dunnock (1753)

Sedge Warbler (1685)

Whitethroat (1663)

Great Tit (1554)

Blackbird (1549)

Long-tailed Tit (1363)

Bullfinch (1089)

Garden Warbler (810)

Willow Warbler (659)

Sedge Warbler (375)

Robin (309)

Wren (291)

Chiffchaff (246)

Blackcap (175)

Great Tit (160)

Dunnock  (154)

Blue Tit (153)

Blackbird (130)

Chaffinch (118)

Long-tailed Tit (108)

Reed Bunting (81)

Bullfinch (71)

Whitethroat (66)

Wales

Republic of Ireland

Northern Ireland

Sedge Warbler (445)

Reed Warbler (412)

Chiffchaff (311)

Blackcap (267)

Wren (245)

Willow Warbler (200)

Blue Tit (187)

Robin (163)

Blackbird (108)

Bullfinch (106)

Dunnock  (105)

Great Tit (94)

Long-tailed Tit (91)

Reed Bunting (88)

Whitethroat (72)

Sedge Warbler (125)

Willow Warbler (87)

Wren (60)

Long-tailed Tit (40)

Chiffchaff (34)

Robin (34)

Reed Warbler (31)

Blackbird (29)

Dunnock (24)

Blue Tit (20)

Blackcap (13)

House Sparrow (12)

Song Thrush (10)

Goldcrest (9)

Grasshopper Warbler (9)

Wren (33)

Blackcap (28)

Blue Tit (27)

Long-tailed Tit (23)

Blackbird (21)

Willow Warbler (21)

Robin (20)

Dunnock (16)

Bullfinch (7)

Song Thrush (7)

Goldcrest (5)

Lesser Redpoll (5)

Sedge Warbler (5)

Goldfinch (4)

Great Tit  (3)

 

Most caught species by habitat – dry scrub

Overall

England

Scotland

Chiffchaff (2,115)

Blackcap (1,928)

Willow Warbler (1,491)

Robin (1,291)

Wren (1,265)

Whitethroat (1093)

Dunnock (999)

Blue Tit (972)

Blackbird (869)

Great Tit (860)

Long-tailed Tit (702)

Bullfinch (696)

Reed Warbler (621)

Sedge Warbler (483)

Garden Warbler (419)

Chiffchaff (1,806)

Blackcap (1,751)

Willow Warbler (1,066)

Robin (1,058)

Wren (1,048)

Whitethroat (1,041)

Dunnock (886)

Blue Tit (878)

Blackbird (766)

Great Tit  (738)

Long-tailed Tit (606)

Reed Warbler (602)

Bullfinch (601)

Garden Warbler (397)

Sedge Warbler (347)

Willow Warbler (393)

Robin (189)

Chiffchaff (174)

Wren (170)

Blackcap (134)

Sedge Warbler (129)

Great Tit (99)

Dunnock (89)

Long-tailed Tit (79)

Chaffinch (77)

Blackbird (64)

Blue Tit (63)

Bullfinch (51)

Lesser Redpoll (38)

Reed Bunting (38)

Wales

Republic of Ireland

Northern Ireland

Chiffchaff (135)

Wren (47)

Bullfinch (44)

Robin (44)

Blackcap (43)

Blackbird (39)

Willow Warbler (32)

Blue Tit (31)

Dunnock (24)

Great Tit (23)

Reed Warbler (19)

Goldfinch (17)

Long-tailed Tit (17)

Song Thrush (15)

Garden Warbler (14)

-

-

 

Most caught species by habitat – wet scrub

Overall

England

Scotland

Reed Warbler (1,769)

Chiffchaff (1,458)

Blackcap (1,178)

Wren (970)

Sedge Warbler (928)

Robin (727)

Willow Warbler (717)

Blue Tit (671)

Dunnock (526)

Whitethroat (467)

Blackbird (461)

Long-tailed Tit (453)

Great Tit (443)

Bullfinch (351)

Garden Warbler (241)

Reed Warbler (1,642)

Chiffchaff (1,348)

Blackcap (1,003)

Wren (775)

Sedge Warbler (627)

Robin (625)

Blue Tit (555)

Willow Warbler (462)

Dunnock (424)

Whitethroat (415)

Great Tit (388)

Long-tailed Tit (382)

Blackbird (381)

Bullfinch (302)

Garden Warbler (227)

Willow Warbler (123)

Sedge Warbler (91)

Wren (54)

Chiffchaff (47)

Robin (39)

Dunnock (34)

Blackcap (27)

Blue Tit (27)

Blackbird (26)

Whitethroat (22)

Goldfinch (19)

Chaffinch (18)

Reed Bunting (16)

Great Tit (15)

Greenfinch (13)

Wales

Republic of Ireland

Northern Ireland

Sedge Warbler (205)

Reed Warbler (123)

Blackcap (120)

Willow Warbler (111)

Wren (108)

Blue Tit (62)

Chiffchaff (61)

Dunnock (52)

Robin (43)

Long-tailed Tit (40)

Great Tit (37)

Blackbird (33)

Bullfinch (31)

Reed Bunting (30)

Whitethroat (30)

-

Wren (33)

Blackcap (28)

Blue Tit (27)

Long-tailed Tit (23)

Blackbird (21)

Willow Warbler (21)

Robin (20)

Dunnock (16)

Bullfinch (7)

Song Thrush (7)

Goldcrest (5)

Lesser Redpoll (5)

Sedge Warbler (5)

Goldfinch (4)

Great Tit (3)

 

Most caught species by habitat – Reedbed

Overall

England

Scotland

Reed Warbler (2,972)

Sedge Warbler (1,154)

Chiffchaff (725)

Wren (664)

Willow Warbler (642)

Blackcap (629)

Blue Tit (600)

Robin (416)

Reed Bunting (339)

Long-tailed Tit (327)

Great Tit (288)

Dunnock (272)

Blackbird (236)

Whitethroat (198)

Garden Warbler (172)

Reed Warbler (2,644)

Sedge Warbler (641)

Chiffchaff (571)

Blackcap (536)

Wren (496)

Blue Tit (484)

Willow Warbler (375)

Robin (295)

Reed Bunting (250)

Long-tailed Tit (233)

Great Tit (225)

Dunnock (217)

Blackbird (176)

Whitethroat (159)

Garden Warbler (154)

Sedge Warbler (155)

Willow Warbler (137)

Wren (47)

Robin (34)

Reed Bunting (27)

Reed Warbler (27)

Great Tit (25)

Chiffchaff (24)

Long-tailed Tit (21)

Blue Tit (15)

Blackcap (7)

Chaffinch (7)

Dunnock (7)

Song Thrush (7)

Blackbird (6)

Wales

Republic of Ireland

Northern Ireland

Reed Warbler(270)

Sedge Warbler (233)

Chiffchaff (96)

Blue Tit (81)

Blackcap (73)

Wren (61)

Reed Bunting (55)

Robin (53)

Willow Warbler (43)

Long-tailed Tit (33)

Great Tit (31)

Whitethroat (28)

Blackbird (25)

Dunnock (24)

Bullfinch (21)

Sedge Warbler (125)

Willow Warbler (87)

Wren (60)

Long-tailed Tit (40)

Chiffchaff (34)

Robin (34)

Reed Warbler (31)

Blackbird (29)

Dunnock (24)

Blue Tit (20)

Blackcap (13)

House Sparrow (12)

Song Thrush (10)

Goldcrest (9)

Grasshopper Warbler (9)

-

 

Most caught species by habitat – Woodland

Overall

England

Scotland

Blackcap (561)

Robin (479)

Chiffchaff (451)

Wren (450)

Blue Tit (309)

Blackbird (271)

Dunnock (255)

Great Tit (227)

Willow Warbler (182)

Long-tailed Tit (143)

Reed Warbler (139)

Bullfinch (114)

Song Thrush (106)

Chaffinch (86)

Sedge Warbler (70)

Blackcap (523)

Chiffchaff (431)

Robin (409)

Wren (401)

Blue Tit (248)

Blackbird (226)

Dunnock (226)

Great Tit (203)

Willow Warbler (162)

Long-tailed Tit (142)

Reed Warbler (139)

Bullfinch (101)

Song Thrush (92)

Chaffinch (70)

Sedge Warbler (70)

Blue Tit (48)

Robin (47)

Blackbird (34)

Dunnock (24)

Great Tit (21)

Wren (20)

Chaffinch (16)

Greenfinch (12)

Tree Sparrow (11)

Song Thrush (8)

Blackcap (7)

Coal Tit (7)

Goldfinch (7)

Willow Warbler (6)

Treecreeper (4)

Wales

Republic of Ireland

Northern Ireland

Blackcap (31)

Wren (29)

Robin (23)

Chiffchaff (19)

Willow Warbler (14)

Blue Tit (13)

Goldcrest (13)

Blackbird (11)

Bullfinch (10)

Song Thrush (6)

Dunnock (5)

Coal Tit (4)

March Tit (4)

Treecreeper (4)

Great Tit (3)

-

-



Related content