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BBWC Home > Contents > Appendix > Tables of breeding performance
   
7.5 Tables of breeding performance
   
1. Clutch size
2. Brood size
3. Egg-stage nest failure rate
4. Chick-stage nest failure rate
 
1. Table of significant trends in Clutch size measured between 1968-2008

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Great Tit 40 199 Linear decline 8.35 eggs 7.27 eggs -1.08 eggs  
Magpie 40 44 Linear decline 5.81 eggs 4.86 eggs -0.95 eggs  
Long-tailed Tit 40 36 Linear decline 7.5 eggs 6.64 eggs -0.86 eggs  
Hen Harrier 40 13 Curvilinear 5.48 eggs 4.81 eggs -0.67 eggs Small sample
Moorhen 40 90 Linear decline 6.49 eggs 5.99 eggs -0.5 eggs  
Blue Tit 40 216 Linear decline 9.24 eggs 8.76 eggs -0.48 eggs  
Peregrine 40 16 Linear decline 3.53 eggs 3.11 eggs -0.42 eggs Small sample
Greenfinch 40 92 Curvilinear 4.73 eggs 4.51 eggs -0.22 eggs  
Pied Wagtail 40 59 Linear decline 5.11 eggs 4.92 eggs -0.19 eggs  
Chaffinch 40 86 Curvilinear 4.23 eggs 4.05 eggs -0.18 eggs  
Nightjar 40 18 Linear decline 2.01 eggs 1.83 eggs -0.18 eggs Small sample
Linnet 40 107 Curvilinear 4.7 eggs 4.57 eggs -0.13 eggs  
Grey Wagtail 40 38 Curvilinear 4.7 eggs 4.63 eggs -0.07 eggs  
Common Sandpiper 40 11 Curvilinear 4 eggs 3.93 eggs -0.07 eggs Small sample
Spotted Flycatcher 40 79 Curvilinear 4.22 eggs 4.15 eggs -0.07 eggs  
Blackbird 40 132 Curvilinear 3.8 eggs 3.76 eggs -0.04 eggs  
Buzzard 40 32 Curvilinear 2.21 eggs 2.2 eggs -0.01 eggs  
Wren 40 95 Curvilinear 5.57 eggs 5.57 eggs 0 eggs  
Dipper 40 73 Curvilinear 4.49 eggs 4.5 eggs 0.01 eggs  
Stock Dove 40 90 Curvilinear 2.07 eggs 2.08 eggs 0.01 eggs  
Yellowhammer 40 43 Curvilinear 3.35 eggs 3.38 eggs 0.03 eggs  
Swallow 40 259 Curvilinear 4.46 eggs 4.49 eggs 0.03 eggs  
Carrion Crow 40 33 Curvilinear 4.08 eggs 4.14 eggs 0.06 eggs Includes Hooded Crow
Lapwing 40 120 Linear increase 3.7 eggs 3.82 eggs 0.12 eggs  
Stonechat 40 32 Curvilinear 4.96 eggs 5.1 eggs 0.14 eggs  
Mistle Thrush 40 34 Linear increase 3.9 eggs 4.05 eggs 0.15 eggs  
Little Owl 40 19 Linear increase 3.39 eggs 3.63 eggs 0.24 eggs Small sample
Dunnock 40 100 Linear increase 3.95 eggs 4.19 eggs 0.24 eggs  
Pied Flycatcher 40 142 Linear increase 6.52 eggs 6.82 eggs 0.3 eggs  
Redstart 40 48 Curvilinear 5.9 eggs 6.24 eggs 0.34 eggs  
Skylark 40 37 Linear increase 3.38 eggs 3.72 eggs 0.34 eggs  
Tree Sparrow 40 190 Curvilinear 4.73 eggs 5.12 eggs 0.39 eggs  
Starling 40 75 Linear increase 4.43 eggs 4.96 eggs 0.53 eggs  
Sand Martin 40 31 Curvilinear 4.68 eggs 5.25 eggs 0.57 eggs  
Barn Owl 40 29 Linear increase 4.54 eggs 5.18 eggs 0.64 eggs Small sample

2. Table of significant trends in Brood size measured between 1968-2008

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Great Tit 40 400 Linear decline 7.6 chicks 6.13 chicks -1.47 chicks  
Blue Tit 40 397 Linear decline 8.33 chicks 7.28 chicks -1.05 chicks  
Sand Martin 40 42 Curvilinear 3.17 chicks 2.72 chicks -0.45 chicks  
Chiffchaff 40 35 Linear decline 5.14 chicks 4.69 chicks -0.45 chicks  
Yellow Wagtail 40 12 Linear decline 4.82 chicks 4.38 chicks -0.44 chicks Small sample
Carrion Crow 40 77 Curvilinear 2.9 chicks 2.48 chicks -0.42 chicks Includes Hooded Crow
Corn Bunting 40 11 Curvilinear 3.08 chicks 2.68 chicks -0.4 chicks Small sample
Magpie 40 76 Curvilinear 3.12 chicks 2.73 chicks -0.39 chicks  
House Sparrow 40 118 Linear decline 3.47 chicks 3.09 chicks -0.38 chicks  
Raven 40 66 Linear decline 3.2 chicks 2.86 chicks -0.34 chicks  
Long-tailed Tit 40 29 Curvilinear 6.72 chicks 6.39 chicks -0.33 chicks Small sample
Greenfinch 40 113 Linear decline 4.1 chicks 3.77 chicks -0.33 chicks  
Grey Heron 40 48 Linear decline 2.69 chicks 2.42 chicks -0.27 chicks Non-breeders include
Bullfinch 40 36 Linear decline 4.17 chicks 3.93 chicks -0.24 chicks  
Pied Wagtail 40 115 Linear decline 4.52 chicks 4.34 chicks -0.18 chicks  
Nightjar 40 25 Linear decline 1.9 chicks 1.77 chicks -0.13 chicks Small sample
Jackdaw 40 99 Curvilinear 2.69 chicks 2.56 chicks -0.13 chicks  
Rook 40 82 Curvilinear 2.21 chicks 2.11 chicks -0.1 chicks  
Treecreeper 40 27 Curvilinear 4.38 chicks 4.3 chicks -0.08 chicks Small sample
Robin 40 171 Curvilinear 4.41 chicks 4.34 chicks -0.07 chicks  
Chaffinch 40 136 Curvilinear 3.59 chicks 3.52 chicks -0.07 chicks  
Turtle Dove 40 16 Curvilinear 1.82 chicks 1.77 chicks -0.05 chicks Small sample
Blackbird 40 172 Curvilinear 3.33 chicks 3.3 chicks -0.03 chicks  
Spotted Flycatcher 40 128 Curvilinear 3.62 chicks 3.61 chicks -0.01 chicks  
Linnet 40 122 Curvilinear 4.08 chicks 4.09 chicks 0.01 chicks  
Stock Dove 40 134 Curvilinear 1.82 chicks 1.83 chicks 0.01 chicks  
Yellowhammer 40 66 Curvilinear 2.96 chicks 2.97 chicks 0.01 chicks  
Wren 40 97 Curvilinear 4.71 chicks 4.73 chicks 0.02 chicks  
Swallow 40 458 Curvilinear 4.09 chicks 4.13 chicks 0.04 chicks  
Grey Wagtail 40 81 Curvilinear 4 chicks 4.05 chicks 0.05 chicks  
Buzzard 40 97 Curvilinear 1.88 chicks 1.95 chicks 0.07 chicks  
Collared Dove 40 71 Linear increase 1.77 chicks 1.85 chicks 0.08 chicks  
Kestrel 40 132 Curvilinear 3.77 chicks 3.88 chicks 0.11 chicks  
Dunnock 40 108 Curvilinear 3.42 chicks 3.54 chicks 0.12 chicks  
Skylark 40 65 Curvilinear 3.1 chicks 3.29 chicks 0.19 chicks  
Peregrine 40 42 Linear increase 2.35 chicks 2.6 chicks 0.25 chicks  
Sparrowhawk 40 69 Curvilinear 3.13 chicks 3.42 chicks 0.29 chicks  
Dipper 40 138 Curvilinear 3.42 chicks 3.72 chicks 0.3 chicks  
Tree Pipit 40 28 Linear increase 4.4 chicks 4.72 chicks 0.32 chicks Small sample
Merlin 40 56 Linear increase 3.5 chicks 3.82 chicks 0.32 chicks  
Tree Sparrow 40 249 Curvilinear 3.78 chicks 4.16 chicks 0.38 chicks  
Redstart 40 85 Curvilinear 5.13 chicks 5.57 chicks 0.44 chicks  
Nuthatch 40 67 Curvilinear 4.24 chicks 5.14 chicks 0.9 chicks  
Moorhen 40 78 Linear increase 2.67 chicks 3.74 chicks 1.07 chicks  

3. Table of significant trends in Daily failure rate (eggs) measured between 1968-2008

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Woodlark 40 22 Curvilinear 0.0593 nests/day 0.0234 nests/day -0.0359 nests/day Small sample
Long-tailed Tit 40 55 Linear decline 0.0346 nests/day 0.0086 nests/day -0.026 nests/day  
Magpie 40 50 Linear decline 0.0269 nests/day 0.0026 nests/day -0.0243 nests/day  
Redshank 40 32 Linear decline 0.0397 nests/day 0.0161 nests/day -0.0236 nests/day  
Dipper 40 103 Curvilinear 0.0256 nests/day 0.0035 nests/day -0.0221 nests/day  
Snipe 40 15 Linear decline 0.0332 nests/day 0.0128 nests/day -0.0204 nests/day Small sample
Carrion Crow 40 49 Linear decline 0.016 nests/day 0.0019 nests/day -0.0141 nests/day Includes Hooded Crow
Sand Martin 40 29 Linear decline 0.0138 nests/day 0.0001 nests/day -0.0137 nests/day Small sample
Robin 40 190 Linear decline 0.0262 nests/day 0.0127 nests/day -0.0135 nests/day  
Wood Warbler 40 21 Linear decline 0.0197 nests/day 0.007 nests/day -0.0127 nests/day Small sample
Yellowhammer 40 65 Curvilinear 0.0495 nests/day 0.0374 nests/day -0.0121 nests/day  
Pied Wagtail 40 84 Curvilinear 0.015 nests/day 0.0056 nests/day -0.0094 nests/day  
Stock Dove 40 87 Curvilinear 0.0136 nests/day 0.0046 nests/day -0.009 nests/day  
Starling 40 117 Linear decline 0.0115 nests/day 0.0026 nests/day -0.0089 nests/day  
Treecreeper 40 22 Curvilinear 0.0222 nests/day 0.0141 nests/day -0.0081 nests/day Small sample
Wheatear 40 17 Curvilinear 0.0081 nests/day 0.0005 nests/day -0.0076 nests/day Small sample
Tawny Owl 40 56 Linear decline 0.0092 nests/day 0.0018 nests/day -0.0074 nests/day Nocturnal species
House Sparrow 40 97 Linear decline 0.0114 nests/day 0.004 nests/day -0.0074 nests/day  
Redstart 40 73 Linear decline 0.0107 nests/day 0.0034 nests/day -0.0073 nests/day  
Greenfinch 40 130 Linear decline 0.0248 nests/day 0.0178 nests/day -0.007 nests/day  
Buzzard 40 27 Linear decline 0.0078 nests/day 0.0009 nests/day -0.0069 nests/day Small sample
Blackcap 40 47 Linear decline 0.0222 nests/day 0.0156 nests/day -0.0066 nests/day  
Sedge Warbler 40 42 Linear decline 0.0128 nests/day 0.0062 nests/day -0.0066 nests/day  
Jackdaw 40 57 Linear decline 0.0074 nests/day 0.002 nests/day -0.0054 nests/day  
Tree Sparrow 40 255 Linear decline 0.0087 nests/day 0.0036 nests/day -0.0051 nests/day  
Wren 40 141 Linear decline 0.0185 nests/day 0.0136 nests/day -0.0049 nests/day  
Barn Owl 40 22 Curvilinear 0.005 nests/day 0.0003 nests/day -0.0047 nests/day Small sample
Marsh Tit 40 20 Linear decline 0.0068 nests/day 0.0021 nests/day -0.0047 nests/day Small sample
Kestrel 40 41 Linear decline 0.0055 nests/day 0.0009 nests/day -0.0046 nests/day  
Merlin 40 25 Linear decline 0.0066 nests/day 0.0023 nests/day -0.0043 nests/day Small sample
Sparrowhawk 40 33 Linear decline 0.0045 nests/day 0.0009 nests/day -0.0036 nests/day  
Great Tit 40 365 Linear decline 0.0062 nests/day 0.0031 nests/day -0.0031 nests/day  
Pied Flycatcher 40 178 Curvilinear 0.0063 nests/day 0.0034 nests/day -0.0029 nests/day  
Nuthatch 40 50 Curvilinear 0.0052 nests/day 0.0024 nests/day -0.0028 nests/day  
Blue Tit 40 372 Linear decline 0.0047 nests/day 0.0023 nests/day -0.0024 nests/day  
Raven 40 22 Curvilinear 0.0022 nests/day 0.0006 nests/day -0.0016 nests/day Small sample
Dunnock 40 144 Curvilinear 0.0248 nests/day 0.0246 nests/day -0.0002 nests/day  
Grey Heron 40 14 Curvilinear 0.0009 nests/day 0.001 nests/day 0.0001 nests/day Non-breeders include
Hen Harrier 40 11 Curvilinear 0.0002 nests/day 0.0012 nests/day 0.001 nests/day Small sample
Tree Pipit 40 13 Curvilinear 0.051 nests/day 0.0525 nests/day 0.0015 nests/day Small sample
Spotted Flycatcher 40 120 Curvilinear 0.0177 nests/day 0.0199 nests/day 0.0022 nests/day  
Mute Swan 40 30 Curvilinear 0.0058 nests/day 0.0106 nests/day 0.0048 nests/day  
Linnet 40 152 Curvilinear 0.0165 nests/day 0.0223 nests/day 0.0058 nests/day  
Bullfinch 40 49 Curvilinear 0.0327 nests/day 0.0388 nests/day 0.0061 nests/day  
Ringed Plover 40 123 Linear increase 0.0232 nests/day 0.0297 nests/day 0.0065 nests/day  
Chaffinch 40 165 Curvilinear 0.0294 nests/day 0.0369 nests/day 0.0075 nests/day  
Moorhen 40 111 Curvilinear 0.0133 nests/day 0.0223 nests/day 0.009 nests/day  
Lapwing 40 132 Curvilinear 0.0167 nests/day 0.0264 nests/day 0.0097 nests/day  
Willow Warbler 40 68 Linear increase 0.009 nests/day 0.019 nests/day 0.01 nests/day  
Blackbird 40 205 Curvilinear 0.0254 nests/day 0.0372 nests/day 0.0118 nests/day  
Whinchat 40 15 Linear increase 0.0069 nests/day 0.0213 nests/day 0.0144 nests/day Small sample
Reed Bunting 40 51 Linear increase 0.0076 nests/day 0.0267 nests/day 0.0191 nests/day  
Oystercatcher 40 112 Curvilinear 0.0148 nests/day 0.0347 nests/day 0.0199 nests/day  
Nightjar 40 24 Linear increase 0.0132 nests/day 0.0393 nests/day 0.0261 nests/day Small sample

4. Table of significant trends in Daily failure rate (chicks) measured between 1968-2008

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Grey Heron 40 26 Linear decline 0.0557 nests/day 0.0003 nests/day -0.0554 nests/day Non-breeders include
Corn Bunting 40 11 Linear decline 0.0331 nests/day 0.0092 nests/day -0.0239 nests/day Small sample
Sand Martin 40 45 Linear decline 0.0177 nests/day 0.0006 nests/day -0.0171 nests/day  
Meadow Pipit 40 60 Linear decline 0.0269 nests/day 0.0105 nests/day -0.0164 nests/day  
Magpie 40 49 Linear decline 0.0167 nests/day 0.0013 nests/day -0.0154 nests/day  
Reed Warbler 40 113 Curvilinear 0.0175 nests/day 0.0045 nests/day -0.013 nests/day  
Skylark 40 54 Linear decline 0.0466 nests/day 0.0339 nests/day -0.0127 nests/day  
Grey Wagtail 40 58 Linear decline 0.0209 nests/day 0.0091 nests/day -0.0118 nests/day  
Blackbird 40 175 Linear decline 0.0294 nests/day 0.0198 nests/day -0.0096 nests/day  
Jackdaw 40 54 Linear decline 0.0117 nests/day 0.0025 nests/day -0.0092 nests/day  
Redstart 40 52 Linear decline 0.0123 nests/day 0.0037 nests/day -0.0086 nests/day  
House Sparrow 40 92 Curvilinear 0.0143 nests/day 0.0057 nests/day -0.0086 nests/day  
Robin 40 165 Curvilinear 0.0251 nests/day 0.0183 nests/day -0.0068 nests/day  
Tree Sparrow 40 185 Curvilinear 0.0125 nests/day 0.0057 nests/day -0.0068 nests/day  
Merlin 40 29 Linear decline 0.0088 nests/day 0.0024 nests/day -0.0064 nests/day Small sample
Stonechat 40 58 Linear decline 0.014 nests/day 0.0076 nests/day -0.0064 nests/day  
Collared Dove 40 57 Linear decline 0.0174 nests/day 0.0111 nests/day -0.0063 nests/day  
Carrion Crow 40 42 Linear decline 0.0072 nests/day 0.0014 nests/day -0.0058 nests/day Includes Hooded Crow
Stock Dove 40 61 Linear decline 0.012 nests/day 0.0068 nests/day -0.0052 nests/day  
Starling 40 134 Linear decline 0.0062 nests/day 0.0018 nests/day -0.0044 nests/day  
Pied Wagtail 40 93 Linear decline 0.0125 nests/day 0.0085 nests/day -0.004 nests/day  
Barn Owl 40 93 Linear decline 0.0023 nests/day 0.0002 nests/day -0.0021 nests/day  
Tawny Owl 40 87 Curvilinear 0.0031 nests/day 0.001 nests/day -0.0021 nests/day Nocturnal species
Yellowhammer 40 51 Curvilinear 0.0461 nests/day 0.0454 nests/day -0.0007 nests/day  
Hen Harrier 40 14 Curvilinear 0 nests/day 0.0005 nests/day 0.0005 nests/day Small sample
Swallow 40 297 Linear increase 0.003 nests/day 0.005 nests/day 0.002 nests/day  
Pied Flycatcher 40 148 Linear increase 0.0043 nests/day 0.0072 nests/day 0.0029 nests/day  
Blue Tit 40 271 Curvilinear 0.0076 nests/day 0.0107 nests/day 0.0031 nests/day  
Great Tit 40 263 Linear increase 0.0055 nests/day 0.0091 nests/day 0.0036 nests/day  
Dunnock 40 119 Curvilinear 0.0245 nests/day 0.0282 nests/day 0.0037 nests/day  
Spotted Flycatcher 40 108 Linear increase 0.0097 nests/day 0.0147 nests/day 0.005 nests/day  
Tree Pipit 40 20 Curvilinear 0.0323 nests/day 0.0393 nests/day 0.007 nests/day Small sample
Nightjar 40 22 Curvilinear 0.0008 nests/day 0.0081 nests/day 0.0073 nests/day Small sample
Linnet 40 110 Linear increase 0.0153 nests/day 0.0226 nests/day 0.0073 nests/day  
Reed Bunting 40 51 Curvilinear 0.0268 nests/day 0.0351 nests/day 0.0083 nests/day  
Bullfinch 40 33 Curvilinear 0.0331 nests/day 0.0414 nests/day 0.0083 nests/day  
Long-tailed Tit 40 39 Linear increase 0.0081 nests/day 0.0176 nests/day 0.0095 nests/day  
Garden Warbler 40 19 Linear increase 0.011 nests/day 0.0252 nests/day 0.0142 nests/day Small sample
Woodlark 40 31 Linear increase 0.0163 nests/day 0.0343 nests/day 0.018 nests/day  

 
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This report should be cited as: Baillie, S.R., Marchant, J.H., Leech, D.I., Renwick, A.R., Joys, A.C., Noble, D.G., Barimore, C., Conway, G.J., Downie, I.S., Risely, K. & Robinson, R.A. (2010). Breeding Birds in the Wider Countryside: their conservation status 2010. BTO Research Report No. 565. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Iain Downie, Mandy T Andrews and Laura Smith: Last updated 21.10.2010