2017 CES Stats
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
2017 results
available to download as a PDF
|
Number of sites |
||||||
|
England |
Scotland |
Wales |
Republic of Ireland |
Northern Ireland |
Overall |
|
|
Total |
110 |
11 |
9 |
3 |
2 |
135 |
|
Dry scrub |
45 |
3 |
2 |
- |
- |
50 |
|
Wet scrub |
28 |
5 |
2 |
1 |
1 |
37 |
|
Reedbed |
24 |
2 |
4 |
2 |
- |
32 |
|
Woodland |
13 |
1 |
1 |
- |
1 |
16 |
|
Number of individual birds caught |
||||||
|
England |
Scotland |
Wales |
Republic of Ireland |
Northern Ireland |
Overall |
|
|
Total |
42,364 (85%) |
2,553 (5%) |
3,494 (7%) |
790 (2%) |
611 (1%) |
49,812 |
|
Adults |
15,289 (36%) |
1,218 (48%) |
1,219 (35%) |
305 (39%) |
405 (66%) |
18,237 (37%) |
|
Juveniles |
27,075 (64%) |
1,335 (52%) |
2,275 (65%) |
485 (61%) |
206 (34%) |
31,575 (63%) |
|
Number of individual birds caught by habitat |
||||||
|
England |
Scotland |
Wales |
Republic of Ireland |
Northern Ireland |
Overall |
|
|
Dry scrub |
17,373 (41%) |
880 (34%) |
804 (23%) |
- |
- |
19,057 (38%) |
|
Adult Juvenile |
6,294 (36%) 11,079 (64%) |
347 (39%) 533 (61%) |
224 (28%) 580 (72%) |
- |
- |
6,865 (36%) 12,192 (64%) |
|
Wet scrub |
11,371 (27%) |
809 (32%) |
475 (14%) |
294 (37%) |
242 (40%) |
13,191 (26%) |
|
Adult Juvenile |
4,128 (36%) 7,243 (64%) |
408 (50%) 401 (50%) |
191 (40%) 284 (60%) |
101 (34%) 193 (66%) |
94 (39%) 148 (61%) |
4,922 (37%) 8,269 (63%) |
|
Reedbed |
9,879 (23%) |
636 (25%) |
1,946 (56%) |
496 (63%) |
- |
12,957 (26%) |
|
Adult Juvenile |
3,461 (35%) 6,418 (65%) |
303 (48%) 333 (52%) |
693 (36%) 1,253 (64%) |
204 (41%) 292 (59%) |
- |
4,661 (36%) 8,296 (64%) |
|
Woodland |
3,741 (9%) |
228 (9%) |
194 (6%) |
- |
369 (60%) |
4,607 (9%) |
|
Adult Juvenile |
1,406 (38%) 2,335 (62%) |
160 (70%) 68 (30%) |
120 (62%) 74 (38%) |
- |
112 (30%) 257 (70%) |
1,789 (39%) 2,818 (61%) |
|
Average number of individual birds caught per site (range given in brackets) |
||||||
|
England |
Scotland |
Wales |
Republic of Ireland |
Northern Ireland |
Overall |
|
|
National |
388 (95–983) |
232 (93–391) |
388 (226–691) |
263 (248–294) |
306 (242–369) |
370 (93–983) |
|
Adult Juvenile |
140 (34–292) 250 (33–774) |
111 (54–191) 133 (57–214) |
135 (76–259) 253 (153–466) |
102 (94–110) 162 (126–193) |
103 (94–112) 203 (148–257) |
136 (34–292) 239 (33–774) |
|
Dry scrub |
394 (95–952) |
293 (247–361) |
402 (374–430) |
- |
- |
388 (95–952) |
|
Adult Juvenile |
143 (34–292) 256 (100–680) |
116 (97–147) 178 (150–214) |
112 (111–113) 290 (263–317) |
- - |
- - |
140 (34–292) 253 (100–680) |
|
Wet scrub |
406 (114–901) |
161 (93–213) |
238 (226–249) |
294 |
242 |
356 (93–901) |
|
Adult Juvenile |
147 (52–291) 259 (33–649) |
82 (54–109) 99 (57–134) |
96 (86–105) 142 (140–144) |
101 193 |
94 148 |
133 (52–291) 223 (33–649) |
|
Reedbed |
412 (191–983) |
318 (245–391) |
487 (229–691) |
248 |
- |
405 (191–983) |
|
Adult Juvenile |
144 (54–228) 267 (109–774) |
152 (112–191) 167 (133–200) |
173 (76–259) 313 (153–466) |
102 (94–110) 146 (126–166) |
- - |
146 (54–259) 259 (109–774) |
|
Woodland |
288 (148–556) |
228 |
269 |
- |
369 |
288 (148–556) |
|
Adult Juvenile |
108 (40–208) 180 (80–348) |
160 68 |
111 158 |
- - |
112 257 |
112 (40–208) 176 (68–348) |
|
Number of species caught |
||||||
|
England |
Scotland |
Wales |
Republic of Ireland |
Northern Ireland |
Overall |
|
|
Total |
89 |
41 |
48 |
38 |
25 |
92 |
|
Dry scrub |
72 |
30 |
33 |
- |
- |
73 |
|
Wet scrub |
59 |
33 |
28 |
23 |
21 |
66 |
|
Reedbed |
59 |
26 |
36 |
32 |
- |
63 |
|
Woodland |
57 |
20 |
24 |
- |
17 |
58 |
|
Average number of species caught per site (range given in brackets) |
||||||
|
England |
Scotland |
Wales |
Republic of Ireland |
Northern Ireland |
Overall |
|
|
National |
24 (14–38) |
18 (12–24) |
24 (16–29) |
23 (18–29) |
19 |
24 (12–35) |
|
Dry scrub |
25 (19–38) |
21 (21–21) |
26 (23–28) |
- |
- |
25 (19 – 38) |
|
Wet scrub |
23 (14–30) |
19 (12–24) |
18 (16–19) |
23 |
21 |
22 (12 – 30) |
|
Reedbed |
22 (14–30) |
21 (20–22) |
26 (21–29) |
24 (18–29) |
- |
22 (14 – 30) |
|
Woodland |
23 (17–32) |
20 |
24 |
- |
17 |
22 (17 – 32) |
|
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 / 455 |
111 / 365 |
129 / 424 |
139 / 457 |
113 / 370 |
134 / 441 |
|
Dry scrub |
141 / 462 (67–279) (220–914) |
107 / 350 (101–116) (330–380) |
153 / 503 (112–195) (366–640) |
- |
- |
139 / 457 (67–279) (220–914) |
|
Wet scrub |
142 / 465 (58–262) (190–860) |
94 / 308 (61–146) (200–480) |
89 / 293 (60–119) (197–390) |
186 / 610 - - |
116 / 380 - - |
133 / 436 (58–262) (190–860) |
|
Reedbed |
132 / 434 (70–201) (230–660) |
166 / 545 (122–210) (400–690) |
148 / 485 (73–232) (240–760) |
116 / 380 (110–122) (360–400) |
- |
135 / 444 (70–232) (230–760) |
|
Woodland |
137 / 449 (64–210) (210–690) |
104 / 340 - - |
85 / 280 - - |
- |
110 / 360 - - |
130 / 426 (64–210) (210–690) |
|
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 |
2.9 0.9 |
2.1 0.6 |
3.0 0.9 |
1.9 0.6 |
2.7 0.8 |
2.3 0.7 |
|
Dry scrub |
2.8 0.9 |
2.7 0.8 |
2.6 0.8 |
- |
- |
2.8 0.9 |
|
Wet scrub |
2.9 0.9 |
1.7 0.5 |
2.7 0.8 |
1.6 0.5 |
2.1 0.6 |
2.7 0.8 |
|
Reedbed |
3.1 0.9 |
1.9 0.6 |
3.3 1.0 |
2.1 0.7 |
- |
3.0 0.9 |
|
Woodland |
2.1 0.6 |
2.2 0.7 |
3.2 1.0 |
- |
3.4 1.0 |
2.2 0.7 |
|
Most caught species (all habitats) |
||
|
Overall |
England |
Scotland |
|
Reed Warbler (5,519) Blackcap (5,298) Chiffchaff (5,167) Blue Tit (3,704) Wren (3,076) Sedge Warbler (2,957) Willow Warbler (2,721) Robin (2,712) Great Tit (2,256) Dunnock (2,090) Whitethroat (2,079) Blackbird (1,897) Long-tailed Tit (1,750) Bullfinch(1,602) Reed Bunting (807) |
Reed Warbler (5,138) Blackcap (4,769) Chiffchaff (4,567) Blue Tit (3,141) Wren (2,432) Robin (2,239) Willow Warbler (2,044) Sedge Warbler (2,035) Great Tit (1,960) Whitethroat (1,953) Dunnock (1,787) Blackbird (1,523) Long-tailed Tit (1,499) Bullfinch (1,432) Garden Warbler (698) |
Willow Warbler (396) Robin (210) Wren (207) Chiffchaff (200) Sedge Warbler (198) Blue Tit (186) Great Tit (140) Blackcap (108) Blackbird (107) Dunnock (106) Long-tailed Tit (95) Chaffinch (76) Whitethroat (62) Bullfinch (60) Reed Warbler (55) |
|
Wales |
Republic of Ireland |
Northern Ireland |
|
Chiffchaff (389) Blackcap (358) Sedge Warbler (308) Reed Warbler (295) Blue Tit (292) Wren (280) Blackbird (204) Robin (182) Willow Warbler (165) Dunnock (140) Long-tailed Tit (131) Great Tit (125) Bullfinch (86) Reed Bunting (83) Whitethroat (51) |
Sedge Warbler (265) Wren (97) Willow Warbler (68) Robin (39) Blue Tit (38) Reed Bunting (37) Blackbird (34) Dunnock (25) Stonechat (25) Bullfinch (16) Grasshopper Warbler (14) House Sparrow (13) Lesser Redpoll (13) Whitethroat (13) Blackcap (12) |
Sedge Warbler (151) Wren (60) Blackcap (51) Willow Warbler (48) Blue Tit (47) Robin (42) Dunnock (32) Reed Warbler (30) Blackbird (29) Great Tit (24) Long-tailed Tit (19) Chaffinch (12) Goldcrest (12) Reed Bunting (11) Song Thrush (11) |
|
Most caught species by habitat – dry scrub |
||
|
Overall |
England |
Scotland |
|
Blackcap (2,321) Chiffchaff (2,280) Blue Tit (1,404) Whitethroat (1,304) Robin (1,163) Willow Warbler (1,129) Wren (1,050) Great Tit (1,044) Dunnock (1,014) Blackbird (870) Bullfinch (856) Long-tailed Tit (662) Reed Warbler (526) Sedge Warbler (405) Garden Warbler (335) |
Blackcap (2,157) Chiffchaff (1,977) Blue Tit (1,281) Whitethroat (1,255) Willow Warbler (1,029) Robin (996) Great Tit (942) Dunnock (924) Wren (913) Bullfinch (792) Blackbird (765) Long-tailed Tit (617) Reed Warbler (515) Sedge Warbler (403) Garden Warbler (317) |
Chiffchaff (124) Robin (104) Willow Warbler (84) Wren (84) Blue Tit (68) Blackcap (67) Great Tit (56) Dunnock (53) Blackbird (40) Whitethroat (38) Bullfinch (34) Long-tailed Tit (22) Coal Tit (20) Goldcrest (20) Chaffinch (15) |
|
Wales |
Republic of Ireland |
Northern Ireland |
|
Chiffchaff (179) Blackcap (97) Blackbird (65) Robin (63) Blue Tit (55) Wren (53) Great Tit (46) Dunnock (37) Bullfinch (30) Goldfinch (27) Long-tailed Tit (23) Song Thrush (21) Garden Warbler (17) Willow Warbler (16) Redstart (11) |
- |
- |
|
Most caught species by habitat – wet scrub |
||
|
Overall |
England |
Scotland |
|
Reed Warbler (1,553) Blackcap (1,511) Chiffchaff (1,431) Wren (935) Sedge Warbler (901) Blue Tit (820) Robin (673) Willow Warbler (666) Dunnock (543) Great Tit (537) Long-tailed Tit (508) Bullfinch (452) Blackbird (448) Whitethroat (415) Garden Warbler (253) |
Reed Warbler (1,550) Blackcap (1,431) Chiffchaff (1,323) Wren (740) Blue Tit (716) Sedge Warbler (640) Robin (569) Great Tit (479) Long-tailed Tit (450) Dunnock (431) Willow Warbler (429) Bullfinch (406) Blackbird (373) Whitethroat (361) Garden Warbler (249) |
Willow Warbler (180) Wren (70) Blue Tit (66) Chiffchaff (60) Sedge Warbler (49) Robin (41) Great Tit (32) Blackbird (30) Dunnock (28) Song Thrush (27) Lesser Redpoll (23) Chaffinch (22) Long-tailed Tit (21) Blackcap (20) Bullfinch (20) |
|
Wales |
Republic of Ireland |
Northern Ireland |
|
Sedge Warbler (82) Wren (62) Dunnock (52) Chiffchaff (48) Blackcap (22) Robin (22) Willow Warbler (22) Whitethroat (21) Long-tailed Tit (20) Blackbird (18) Bullfinch (18) Swallow (14) Great Tit (12) Blue Tit (10) Song Thrush (10) |
Sedge Warbler (123) Wren (32) Stonechat (22) Robin (16) Willow Warbler (14) Whitethroat (13) Blue Tit (12) Blackbird (11) Dunnock (8) Reed Bunting (7) Great Tit (5) Linnet (5) Swallow (5) Grasshopper Warbler (4) Lesser Redpoll (4) |
Blackcap (37) Wren (31) Robin (25) Dunnock (24) Willow Warbler (21) Long-tailed Tit (17) Blackbird (16) Blue Tit (16) Great Tit (9) Song Thrush (9) Bullfinch (8) Sedge Warbler (7) Goldfinch (5) Starling (5) Chaffinch (3) |
|
Most caught species by habitat – Reedbed |
||
|
Overall |
England |
Scotland |
|
Reed Warbler (3,281) Sedge Warbler (1,458) Blue Tit (1,061) Blackcap (938) Chiffchaff (924) Wren (721) Willow Warbler (708) Robin (477) Reed Bunting (434) Great Tit (424) Long-tailed Tit (409) Whitethroat (312) Blackbird (310) Dunnock (296) Bullfinch (171) |
Reed Warbler (2,944) Sedge Warbler (943) Blue Tit (824) Chiffchaff (762) Blackcap (717) Wren (472) Willow Warbler (402) Robin (352) Great Tit (326) Reed Bunting (301) Whitethroat (289) Long-tailed Tit (277) Dunnock (230) Blackbird (176) Cetti’s Warbler (142) |
Sedge Warbler (148) Willow Warbler (128) Reed Warbler (54) Long-tailed Tit (50) Wren (42) Robin (33) Great Tit (32) Reed Bunting (26) Blue Tit (23) Chiffchaff (16) Blackcap (15) Chaffinch (11) Blackbird (8) Dunnock (8) Coal Tit (7) |
|
Wales |
Republic of Ireland |
Northern Ireland |
|
Reed Warbler (283) Sedge Warbler (225) Blackcap (195) Blue Tit (188) Wren (142) Chiffchaff (141) Willow Warbler (124) Blackbird (103) Reed Bunting (77) Long-tailed Tit (76) Robin (69) Great Tit (64) Dunnock (41) Bullfinch (32) Cetti’s Warbler (27) |
Sedge Warbler (142) Wren (65) Willow Warbler (54) Reed Bunting (30) Blue Tit (26) Blackbird (23) Robin (23) Dunnock (17) Bullfinch (16) House Sparrow (13) Blackcap (11) Grasshopper Warbler (10) Goldcrest (9) Lesser Redpoll (9) Song Thrush (7) |
- |
|
Most caught species by habitat – Woodland |
||
|
Overall |
England |
Scotland |
|
Chiffchaff (532) Blackcap (528) Blue Tit (419) Robin (399) Wren (370) Blackbird (269) Great Tit (251) Dunnock (237) Willow Warbler (218) Sedge Warbler (193) Long-tailed Tit (171) Reed Warbler (159) Bullfinch (123) Song Thrush (84) Chaffinch (81) |
Chiffchaff (505) Blackcap (464) Robin (322) Blue Tit (320) Wren (307) Great Tit (213) Blackbird (209) Dunnock (202) Willow Warbler (184) Long-tailed Tit (155) Reed Warbler (129) Bullfinch (117) Song Thrush (69) Coal Tit (53) Sedge Warbler (49) |
Robin (32) Blackbird (29) Blue Tit (29) Chaffinch (28) Great Tit (20) Dunnock (17) Tree Sparrow (15) Wren (11) Greenfinch (8) Blackcap (6) Coal Tit (6) Song Thrush (5) House Sparrow (4) Willow Warbler (4) Goldcrest (3) |
|
Wales |
Republic of Ireland |
Northern Ireland |
|
Blackcap (44) Blue Tit (39) Robin (28) Wren (23) Chiffchaff (21) Blackbird (18) Goldcrest (18) Long-tailed Tit (12) Dunnock (10) Marsh Tit (9) Song Thrush (8) Treecreeper (8) Bullfinch (6) Coal Tit (6) Nuthatch (4) |
- |
Sedge Warbler (144) Blue Tit (31) Reed Warbler (30) Wren (29) Willow Warbler (27) Robin (17) Great Tit (15) Blackcap (14) Blackbird (13) Reed Bunting (11) Chaffinch (9) Goldcrest (9) Dunnock (8) Chiffchaff (6) Long-tailed Tit (2) |
Share this page