Number of 1km squares in which each species
was recorded in Wales



These figures show the total number of squares in which a given species was recorded at least once in a particular year. They provide as useful indication of which species are widely distributed and which have more restricted distributions. For comparative purposes the data can be used to calculate the frequency of occurrence of each species by dividing the number of squares occupied by the total number of squares surveyed. This measure has the advantage that it can be used to compare results based on different numbers of squares. Particular care should be taken in interpreting such results where only a few squares could be surveyed (less than 30-50 squares). While these figures may provide a general indication of major changes in distributions over time they do not provide a statistically robust measure of such changes because they do not take account of the BBS sampling strategy or of temporal variation in the sample of squares surveyed.
BBS trend analyses are available here

 
 

Species 94 95 96 97 98 99 00 01 02 03 04 05 06 07
Total No squares surveyed 122 121 116 138 192 223 213 22 215 214 253 270 267 263
Mute Swan 3 4 4 5 9 10 13 1 16 12 16 15 10 13
Pink-footed Goose . . . . . . . . . 1 . . . .
Greylag Goose 2 1 3 3 2 5 6 . 5 8 4 8 11 10
Feral/hybrid Goose . . . 1 . . . . . . 2 . 1 .
Canada Goose 3 9 9 6 11 16 22 1 21 20 36 32 40 41
Brent Goose . . . . . . . . . . . . 1 .
Shelduck 5 6 7 7 8 7 9 . 7 9 9 10 15 7
Mandarin . 1 . . 1 1 2 . 1 . 1 . 1 .
Wigeon . 2 . 1 . . 1 . 1 . . . . .
Gadwall . . . . 1 1 1 . 1 . . . . 1
Teal 1 2 1 . 1 1 3 . 2 1 2 4 3 2
Mallard 38 40 32 42 61 73 65 7 77 57 77 86 83 76
Feral/hybrid mallard type . . . . . . . . . . . . 2 1
Pintail . . . . . 1 . . . . . . . .
Shoveler 1 . . . . . . . . 1 . 1 1 2
Red-crested Pochard . . . . 1 . 1 . . . . . . .
Pochard . . . . . . 1 . 1 1 . 1 . 1
Tufted Duck 2 2 3 3 4 3 4 . 3 3 3 6 4 2
Eider . . . . . . . . . . . . . 1
Common Scoter . . 1 . . . . . . . . . . .
Goldeneye . . . . . . . . . . . 1 . .
Red-breasted Merganser 1 1 . 2 1 2 1 . 1 . 1 2 2 1
Goosander 6 3 4 5 8 4 4 1 6 6 7 8 5 5
Ruddy Duck . . . . 2 1 1 . 1 2 3 2 1 .
Red Grouse 1 . 2 1 4 7 4 1 5 5 4 5 4 3
Black Grouse . . . . . 1 1 . 2 . 2 . 1 .
Red-legged Partridge . . . 1 1 1 4 1 2 4 6 5 3 10
Grey Partridge 1 2 1 1 1 2 1 . 2 3 1 3 3 2
Quail . . . . 1 . . . . . 1 . . .
Pheasant 53 50 48 59 73 78 82 2 76 84 109 125 128 135
Golden Pheasant . . . . . . . . . 1 . . . .
Little Grebe 2 1 . 1 3 3 4 . 3 6 5 8 5 4
Great Crested Grebe 1 1 1 1 3 1 4 . 1 2 1 3 3 4
Fulmar 2 3 2 2 4 4 3 . 9 6 6 7 6 3
Manx Shearwater . . . . . . . . 1 . . . . .
Gannet . 1 1 1 1 2 1 . 3 2 3 2 5 2
Cormorant 5 10 13 9 23 21 19 4 22 19 25 22 23 16
Shag 1 1 2 1 1 2 . . 3 1 4 3 3 2
Little Egret . . . . 1 . . . 1 1 2 2 3 1
Grey Heron 21 25 26 35 41 48 46 2 47 54 53 58 47 49
Honey Buzzard . . . . . . . . . 1 . . . .
Red Kite 8 7 7 5 6 12 9 1 15 14 24 31 33 26
Marsh Harrier . 1 . . . . . . . . . 1 . .
Hen Harrier 1 1 1 2 . 1 1 . 2 4 2 1 4 1
Goshawk . 1 1 2 3 5 6 2 5 7 3 5 4 9
Sparrowhawk 10 10 12 13 33 21 19 . 23 25 16 25 29 32
Buzzard 80 78 75 86 113 150 151 10 155 142 160 176 178 186
Osprey . . . . . . . . 1 . 1 . . .
Kestrel 17 15 14 18 24 27 22 . 26 22 26 35 31 30
Merlin 1 . . 2 1 . 3 . 4 3 1 . 1 .
Hobby 1 1 . 1 2 1 . . 3 1 . 1 1 3
Peregrine 11 6 8 3 9 8 8 . 5 4 14 16 7 8
Water Rail . . . . . . . . . . . 2 1 3
Spotted Crake . . . . . . . . . . . . 1 .
Moorhen 13 10 12 16 23 27 22 1 18 17 29 29 19 26
Coot 6 6 5 4 6 9 12 . 9 11 11 12 10 9
Oystercatcher 4 4 6 7 7