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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 1968-2009

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Magpie 41 43 Linear decline 5.8 eggs 4.83 eggs -0.97 eggs  
Great Tit 41 289 Linear decline 8.19 eggs 7.33 eggs -0.86 eggs  
Long-tailed Tit 41 39 Curvilinear 7.72 eggs 6.88 eggs -0.84 eggs  
Grey Heron 41 15 Linear decline 4.05 eggs 3.45 eggs -0.6 eggs Non-breeders include
Hen Harrier 41 12 Curvilinear 5.41 eggs 4.85 eggs -0.56 eggs Small sample
Peregrine 41 17 Linear decline 3.55 eggs 3.11 eggs -0.44 eggs Small sample
Moorhen 41 97 Linear decline 6.43 eggs 6.07 eggs -0.36 eggs  
Greenfinch 41 91 Linear decline 4.76 eggs 4.56 eggs -0.2 eggs  
Chaffinch 41 86 Curvilinear 4.23 eggs 4.05 eggs -0.18 eggs  
Nightjar 41 18 Linear decline 2 eggs 1.83 eggs -0.17 eggs Small sample
Pied Wagtail 41 60 Linear decline 5.1 eggs 4.94 eggs -0.16 eggs  
Golden Plover 41 13 Linear decline 3.98 eggs 3.84 eggs -0.14 eggs Small sample
Common Sandpiper 41 12 Curvilinear 3.99 eggs 3.89 eggs -0.1 eggs Small sample
Grey Wagtail 41 38 Curvilinear 4.73 eggs 4.64 eggs -0.09 eggs  
Buzzard 41 34 Curvilinear 2.2 eggs 2.21 eggs 0.01 eggs  
Yellowhammer 41 43 Curvilinear 3.36 eggs 3.39 eggs 0.03 eggs  
Lapwing 41 127 Linear increase 3.69 eggs 3.83 eggs 0.14 eggs  
Mistle Thrush 41 33 Linear increase 3.89 eggs 4.04 eggs 0.15 eggs  
Little Owl 41 21 Linear increase 3.41 eggs 3.6 eggs 0.19 eggs Small sample
Dunnock 41 100 Linear increase 3.94 eggs 4.18 eggs 0.24 eggs  
Pied Flycatcher 41 336 Linear increase 6.55 eggs 6.86 eggs 0.31 eggs  
Skylark 41 36 Linear increase 3.37 eggs 3.7 eggs 0.33 eggs  
Redstart 41 48 Curvilinear 5.9 eggs 6.25 eggs 0.35 eggs  
Tree Sparrow 41 247 Curvilinear 4.74 eggs 5.14 eggs 0.4 eggs  
Barn Owl 41 38 Linear increase 4.62 eggs 5.08 eggs 0.46 eggs  
Starling 41 76 Linear increase 4.43 eggs 5 eggs 0.57 eggs  
SandMartin 41 31 Linear increase 3.86 eggs 4.93 eggs 1.07 eggs  

2. Table of significant trends in Brood size measured between 1968-2009

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Great Tit 41 596 Linear decline 7.37 chicks 6.19 chicks -1.18 chicks  
Blue Tit 41 644 Curvilinear 7.8 chicks 7.18 chicks -0.62 chicks  
SandMartin 41 46 Curvilinear 3.12 chicks 2.54 chicks -0.58 chicks  
Magpie 41 75 Curvilinear 3.12 chicks 2.57 chicks -0.55 chicks  
Yellow Wagtail 41 12 Linear decline 4.83 chicks 4.31 chicks -0.52 chicks Small sample
Coal Tit 41 74 Curvilinear 7.31 chicks 6.81 chicks -0.5 chicks  
Chiffchaff 41 39 Linear decline 5.14 chicks 4.67 chicks -0.47 chicks  
Carrion Crow 41 79 Curvilinear 2.89 chicks 2.43 chicks -0.46 chicks Includes Hooded Crow
Grey Heron 41 92 Curvilinear 2.72 chicks 2.29 chicks -0.43 chicks Non-breeders include
House Sparrow 41 140 Linear decline 3.48 chicks 3.06 chicks -0.42 chicks  
Bullfinch 41 36 Curvilinear 4.12 chicks 3.73 chicks -0.39 chicks  
Long-tailed Tit 41 31 Curvilinear 6.67 chicks 6.3 chicks -0.37 chicks  
Corn Bunting 41 12 Curvilinear 3.12 chicks 2.75 chicks -0.37 chicks Small sample
Greenfinch 41 113 Linear decline 4.1 chicks 3.76 chicks -0.34 chicks  
Raven 41 69 Linear decline 3.17 chicks 2.88 chicks -0.29 chicks  
Pied Wagtail 41 118 Linear decline 4.52 chicks 4.34 chicks -0.18 chicks  
Rook 41 82 Curvilinear 2.21 chicks 2.07 chicks -0.14 chicks  
Turtle Dove 41 15 Curvilinear 1.82 chicks 1.72 chicks -0.1 chicks Small sample
Jackdaw 41 108 Curvilinear 2.7 chicks 2.6 chicks -0.1 chicks  
Robin 41 203 Curvilinear 4.39 chicks 4.31 chicks -0.08 chicks  
Chaffinch 41 138 Curvilinear 3.59 chicks 3.54 chicks -0.05 chicks  
Wren 41 99 Curvilinear 4.71 chicks 4.67 chicks -0.04 chicks  
Blackbird 41 235 Curvilinear 3.34 chicks 3.31 chicks -0.03 chicks  
Yellowhammer 41 65 Curvilinear 2.97 chicks 2.98 chicks 0.01 chicks  
Stock Dove 41 161 Curvilinear 1.82 chicks 1.83 chicks 0.01 chicks  
Spotted Flycatcher 41 129 Curvilinear 3.62 chicks 3.64 chicks 0.02 chicks  
Linnet 41 122 Curvilinear 4.08 chicks 4.11 chicks 0.03 chicks  
Swallow 41 751 Curvilinear 4.1 chicks 4.15 chicks 0.05 chicks  
Collared Dove 41 72 Linear increase 1.78 chicks 1.84 chicks 0.06 chicks  
Grey Wagtail 41 81 Curvilinear 4.01 chicks 4.07 chicks 0.06 chicks  
Buzzard 41 104 Curvilinear 1.87 chicks 1.95 chicks 0.08 chicks  
Stonechat 41 65 Curvilinear 4.64 chicks 4.74 chicks 0.1 chicks  
Kestrel 41 139 Curvilinear 3.77 chicks 3.88 chicks 0.11 chicks  
Dunnock 41 109 Curvilinear 3.41 chicks 3.53 chicks 0.12 chicks  
Tree Pipit 41 29 Curvilinear 4.29 chicks 4.47 chicks 0.18 chicks Small sample
Mute Swan 41 67 Curvilinear 4.43 chicks 4.61 chicks 0.18 chicks  
Skylark 41 65 Curvilinear 3.11 chicks 3.31 chicks 0.2 chicks  
Peregrine 41 44 Linear increase 2.35 chicks 2.59 chicks 0.24 chicks  
Sparrowhawk 41 69 Curvilinear 3.14 chicks 3.42 chicks 0.28 chicks  
Dipper 41 142 Curvilinear 3.43 chicks 3.76 chicks 0.33 chicks  
Merlin 41 55 Linear increase 3.48 chicks 3.85 chicks 0.37 chicks  
Tree Sparrow 41 327 Curvilinear 3.76 chicks 4.15 chicks 0.39 chicks  
Starling 41 214 Linear increase 3.3 chicks 3.71 chicks 0.41 chicks  
Redstart 41 86 Curvilinear 5.14 chicks 5.57 chicks 0.43 chicks  
Jay 41 11 Linear increase 3.41 chicks 3.89 chicks 0.48 chicks Small sample
Nuthatch 41 70 Curvilinear 4.35 chicks 5.22 chicks 0.87 chicks  
Moorhen 41 84 Linear increase 2.8 chicks 3.7 chicks 0.9 chicks  

3. Table of significant trends in Daily failure rate (eggs) measured between 1968-2009

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Woodlark 41 21 Curvilinear 0.0624 nests/day 0.0247 nests/day -0.0377 nests/day Small sample
Long-tailed Tit 41 56 Linear decline 0.034 nests/day 0.0079 nests/day -0.0261 nests/day  
Redshank 41 31 Linear decline 0.0398 nests/day 0.014 nests/day -0.0258 nests/day  
Magpie 41 49 Linear decline 0.0274 nests/day 0.0022 nests/day -0.0252 nests/day  
Dipper 41 103 Curvilinear 0.0279 nests/day 0.0033 nests/day -0.0246 nests/day  
Snipe 41 14 Linear decline 0.032 nests/day 0.0132 nests/day -0.0188 nests/day Small sample
Yellowhammer 41 63 Curvilinear 0.0501 nests/day 0.0323 nests/day -0.0178 nests/day  
Carrion Crow 41 48 Linear decline 0.0178 nests/day 0.0013 nests/day -0.0165 nests/day Includes Hooded Crow
Woodpigeon 41 89 Curvilinear 0.0461 nests/day 0.0309 nests/day -0.0152 nests/day  
Wood Warbler 41 21 Linear decline 0.0206 nests/day 0.0058 nests/day -0.0148 nests/day Small sample
SandMartin 41 26 Linear decline 0.0146 nests/day 0 nests/day -0.0146 nests/day Small sample
Robin 41 202 Linear decline 0.023 nests/day 0.011 nests/day -0.012 nests/day  
Pied Wagtail 41 82 Linear decline 0.0186 nests/day 0.0067 nests/day -0.0119 nests/day  
Stock Dove 41 103 Linear decline 0.0163 nests/day 0.0052 nests/day -0.0111 nests/day  
Greenfinch 41 126 Linear decline 0.0249 nests/day 0.0156 nests/day -0.0093 nests/day  
Starling 41 120 Linear decline 0.0114 nests/day 0.0023 nests/day -0.0091 nests/day  
Treecreeper 41 21 Curvilinear 0.0236 nests/day 0.0146 nests/day -0.009 nests/day Small sample
Redstart 41 73 Linear decline 0.0111 nests/day 0.0023 nests/day -0.0088 nests/day  
Mistle Thrush 41 55 Linear decline 0.0252 nests/day 0.0168 nests/day -0.0084 nests/day  
Blackcap 41 48 Linear decline 0.0222 nests/day 0.0142 nests/day -0.008 nests/day  
Wheatear 41 16 Curvilinear 0.0079 nests/day 0.0002 nests/day -0.0077 nests/day Small sample
Buzzard 41 28 Linear decline 0.0083 nests/day 0.0006 nests/day -0.0077 nests/day Small sample
Barn Owl 41 27 Linear decline 0.0081 nests/day 0.0005 nests/day -0.0076 nests/day Small sample
Tawny Owl 41 59 Linear decline 0.0089 nests/day 0.0015 nests/day -0.0074 nests/day Nocturnal species
Grey Wagtail 41 58 Linear decline 0.0176 nests/day 0.0102 nests/day -0.0074 nests/day  
Nuthatch 41 50 Linear decline 0.0095 nests/day 0.0021 nests/day -0.0074 nests/day  
House Sparrow 41 109 Linear decline 0.011 nests/day 0.004 nests/day -0.007 nests/day  
Wren 41 139 Linear decline 0.0188 nests/day 0.0121 nests/day -0.0067 nests/day  
Marsh Tit 41 21 Curvilinear 0.0096 nests/day 0.0029 nests/day -0.0067 nests/day Small sample
Collared Dove 41 60 Curvilinear 0.0315 nests/day 0.0259 nests/day -0.0056 nests/day  
Jackdaw 41 59 Linear decline 0.0072 nests/day 0.0018 nests/day -0.0054 nests/day  
Kestrel 41 41 Linear decline 0.0059 nests/day 0.0006 nests/day -0.0053 nests/day  
Tree Sparrow 41 326 Linear decline 0.0086 nests/day 0.0034 nests/day -0.0052 nests/day  
Merlin 41 24 Linear decline 0.007 nests/day 0.0019 nests/day -0.0051 nests/day Small sample
Sparrowhawk 41 33 Linear decline 0.0048 nests/day 0.0006 nests/day -0.0042 nests/day  
Great Tit 41 526 Curvilinear 0.0063 nests/day 0.0029 nests/day -0.0034 nests/day  
Coal Tit 41 55 Linear decline 0.0048 nests/day 0.0016 nests/day -0.0032 nests/day  
Pied Flycatcher 41 409 Curvilinear 0.006 nests/day 0.0029 nests/day -0.0031 nests/day  
Sedge Warbler 41 41 Curvilinear 0.0144 nests/day 0.0116 nests/day -0.0028 nests/day  
Dunnock 41 140 Curvilinear 0.0261 nests/day 0.0237 nests/day -0.0024 nests/day  
Raven 41 22 Curvilinear 0.0027 nests/day 0.0006 nests/day -0.0021 nests/day Small sample
Blue Tit 41 571 Curvilinear 0.0042 nests/day 0.0023 nests/day -0.0019 nests/day  
Spotted Flycatcher 41 116 Curvilinear 0.0186 nests/day 0.0185 nests/day -0.0001 nests/day  
Tree Pipit 41 13 Curvilinear 0.0515 nests/day 0.0518 nests/day 0.0003 nests/day Small sample
Grey Heron 41 18 Curvilinear 0 nests/day 0.0004 nests/day 0.0004 nests/day Non-breeders include
Hen Harrier 41 10 Curvilinear 0.0002 nests/day 0.0008 nests/day 0.0006 nests/day Small sample
Bullfinch 41 51 Curvilinear 0.0326 nests/day 0.0375 nests/day 0.0049 nests/day  
Lapwing 41 133 Linear increase 0.0143 nests/day 0.0213 nests/day 0.007 nests/day  
Chaffinch 41 163 Curvilinear 0.0305 nests/day 0.0376 nests/day 0.0071 nests/day  
Willow Warbler 41 66 Linear increase 0.0094 nests/day 0.017 nests/day 0.0076 nests/day  
Ringed Plover 41 125 Linear increase 0.0228 nests/day 0.0307 nests/day 0.0079 nests/day  
Blackbird 41 263 Curvilinear 0.0263 nests/day 0.0363 nests/day 0.01 nests/day  
Moorhen 41 113 Curvilinear 0.0132 nests/day 0.0252 nests/day 0.012 nests/day  
Reed Bunting 41 50 Linear increase 0.008 nests/day 0.0223 nests/day 0.0143 nests/day  
Oystercatcher 41 115 Curvilinear 0.015 nests/day 0.0331 nests/day 0.0181 nests/day  
Nightjar 41 23 Linear increase 0.0121 nests/day 0.0386 nests/day 0.0265 nests/day Small sample

4. Table of significant trends in Daily failure rate (chicks) measured between 1968-2009

Species Period
(yrs)
Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Corn Bunting 41 12 Curvilinear 0.0441 nests/day 0.0194 nests/day -0.0247 nests/day Small sample
SandMartin 41 49 Linear decline 0.0182 nests/day 0.0005 nests/day -0.0177 nests/day  
Meadow Pipit 41 61 Linear decline 0.0266 nests/day 0.0105 nests/day -0.0161 nests/day  
Skylark 41 53 Linear decline 0.0474 nests/day 0.0319 nests/day -0.0155 nests/day  
Magpie 41 47 Linear decline 0.0166 nests/day 0.0012 nests/day -0.0154 nests/day  
Reed Warbler 41 117 Linear decline 0.0202 nests/day 0.0059 nests/day -0.0143 nests/day  
Grey Wagtail 41 57 Linear decline 0.0211 nests/day 0.0084 nests/day -0.0127 nests/day  
Blackbird 41 216 Linear decline 0.0288 nests/day 0.0192 nests/day -0.0096 nests/day  
Tree Sparrow 41 222 Linear decline 0.015 nests/day 0.0056 nests/day -0.0094 nests/day  
Redstart 41 52 Linear decline 0.0123 nests/day 0.0034 nests/day -0.0089 nests/day  
Jackdaw 41 57 Linear decline 0.0113 nests/day 0.0025 nests/day -0.0088 nests/day  
House Sparrow 41 102 Curvilinear 0.0144 nests/day 0.0071 nests/day -0.0073 nests/day  
Carrion Crow 41 41 Linear decline 0.0076 nests/day 0.0011 nests/day -0.0065 nests/day Includes Hooded Crow
Merlin 41 28 Linear decline 0.0086 nests/day 0.0025 nests/day -0.0061 nests/day Small sample
Collared Dove 41 54 Linear decline 0.017 nests/day 0.0112 nests/day -0.0058 nests/day  
Stock Dove 41 68 Linear decline 0.012 nests/day 0.0065 nests/day -0.0055 nests/day  
Pied Wagtail 41 91 Linear decline 0.0124 nests/day 0.0084 nests/day -0.004 nests/day  
Starling 41 134 Linear decline 0.0058 nests/day 0.002 nests/day -0.0038 nests/day  
Peregrine 41 24 Linear decline 0.0035 nests/day 0.0009 nests/day -0.0026 nests/day Small sample
Tawny Owl 41 89 Curvilinear 0.0035 nests/day 0.0011 nests/day -0.0024 nests/day Nocturnal species
Nuthatch 41 57 Linear decline 0.0045 nests/day 0.0021 nests/day -0.0024 nests/day  
Barn Owl 41 120 Linear decline 0.0022 nests/day 0.0002 nests/day -0.002 nests/day  
Yellowhammer 41 50 Curvilinear 0.0451 nests/day 0.0434 nests/day -0.0017 nests/day  
Dipper 41 79 Curvilinear 0.0064 nests/day 0.0057 nests/day -0.0007 nests/day  
Treecreeper 41 22 Curvilinear 0.015 nests/day 0.0146 nests/day -0.0004 nests/day Small sample
Raven 41 30 Curvilinear 0.0003 nests/day 0.0001 nests/day -0.0002 nests/day Small sample
Swallow 41 462 Linear increase 0.0028 nests/day 0.0046 nests/day 0.0018 nests/day  
Blue Tit 41 406 Linear increase 0.0063 nests/day 0.0083 nests/day 0.002 nests/day  
Dunnock 41 114 Curvilinear 0.0243 nests/day 0.0271 nests/day 0.0028 nests/day  
Pied Flycatcher 41 332 Linear increase 0.0035 nests/day 0.0071 nests/day 0.0036 nests/day  
Spotted Flycatcher 41 105 Linear increase 0.0098 nests/day 0.0146 nests/day 0.0048 nests/day  
Willow Warbler 41 122 Linear increase 0.0153 nests/day 0.0202 nests/day 0.0049 nests/day  
Coal Tit 41 57 Curvilinear 0.0029 nests/day 0.0082 nests/day 0.0053 nests/day  
Nightjar 41 21 Curvilinear 0.0012 nests/day 0.0071 nests/day 0.0059 nests/day Small sample
Linnet 41 107 Linear increase 0.0158 nests/day 0.0218 nests/day 0.006 nests/day  
Long-tailed Tit 41 39 Linear increase 0.0078 nests/day 0.0176 nests/day 0.0098 nests/day  
Bullfinch 41 34 Curvilinear 0.0323 nests/day 0.046 nests/day 0.0137 nests/day  
Tree Pipit 41 20 Curvilinear 0.0338 nests/day 0.0491 nests/day 0.0153 nests/day Small sample
Garden Warbler 41 19 Linear increase 0.0103 nests/day 0.028 nests/day 0.0177 nests/day Small sample

 

This report should be cited as: Baillie, S.R., Marchant, J.H., Leech, D.I., Renwick, A.R., Eglington, S.M., Joys, A.C., Noble, D.G., Barimore, C., Conway, G.J., Downie, I.S., Risely, K. & Robinson, R.A. (2012) BirdTrends 2011. BTO Research Report No. 609. BTO, Thetford. http://www.bto.org/birdtrends