BBS

Number of 1km squares in which each species
was recorded in Isle of Man

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 (fewer 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	08	09
Total No squares surveyed	4	4	4	6	6	5	3	0	3	4	6	3	5	4	1	0
Mute Swan	.	.	.	.	.	1	.	.	.	.	.	.	.	.	.	.
Pink-footed Goose	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.	.
Greylag Goose	.	.	1	1	.	.	1	.	1	1	.	.	.	.	.	.
Canada Goose	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.	.
Shelduck	.	.	.	1	1	.	.	.	.	.	1	1	1	1	.	.
Mallard	1	2	3	4	2	1	2	.	1	2	3	2	4	3	1	.
Tufted Duck	.	.	.	.	.	.	.	.	.	.	.	.	1	1	.	.
Eider	.	.	.	.	.	.	.	.	.	.	1	1	1	1	.	.
Red-legged Partridge	.	.	.	.	.	.	.	.	.	.	1	.	.	.	.	.
Pheasant	4	4	4	6	6	5	3	.	3	4	6	2	5	4	1	.
Fulmar	.	.	.	1	1	.	.	.	.	.	1	1	1	1	.	.
Gannet	.	.	.	.	1	.	.	.	.	.	1	.	1	1	.	.
Cormorant	.	.	.	.	2	.	.	.	.	.	1	1	1	1	.	.
Shag	.	.	.	1	1	.	.	.	.	.	1	.	.	.	.	.
Grey Heron	1	2	.	2	1	2	2	.	1	.	2	.	2	.	.	.
Hen Harrier	.	1	1	.	.	.	1	.	.	1	2	.	1	.	.	.
Sparrowhawk	.	.	.	2	.	.	1	.	1	2	.	.	.	.	1	.
Kestrel	.	.	1	1	.	.	.	.	.	.	2	1	1	.	.	.
Peregrine	.	.	.	2	1	.	.	.	.	.	1	.	1	1	.	.
Moorhen	2	.	1	1	1	1	1	.	1	.	1	1	1	2	1	.
Oystercatcher	1	2	1	1	2	2	1	.	.	.	1	1	1	1	.	.
Ringed Plover	.	.	.	.	.	.	.	.	.	.	1	1	1	.	.	.
Lapwing	.	.	.	2	.	.	.	.	.	.	.	.	.	.	.	.
Sanderling	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.	.
Curlew	4	2	1	4	4	2	2	.	2	2	2	.	2	2	.	.
Common Sandpiper	.	.	.	.	.	.	.	.	.	.	.	1	1	.	.	.
Lesser Black-backed Gull	1	.	.	.	1	.	.	.	.	.	.	.	2	.	.	.
Herring Gull	3	4	4	5	5	5	3	.	3	4	5	3	4	4	1	.
Great Black-backed Gull	1	1	2	5	4	1	2	.	1	.	1	1	1	2	.	.
Guillemot	.	.	.	.	.	.	.	.	.	.	1	.	1	.	.	.
Razorbill	.	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.
Black Guillemot	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Feral Pigeon	1	3	1	1	3	1	1	.	1	1	1	.	1	.	.	.
Woodpigeon	4	4	4	4	6	4	3	.	3	4	6	3	5	4	1	.
Collared Dove	1	3	1	5	2	2	2	.	1	2	4	3	5	2	1	.
Barn Owl	.	.	.	.	.	.	1	.	.	.	.	.	.	.	.	.
Swift	2	2	3	.	1	2	.	.	2	.	1	.	.	.	.	.
Skylark	.	1	3	2	.	.	.	.	.	.	.	.	.	.	.	.
Sand Martin	.	.	.	1	.	.	.	.	1	.	.	.	.	.	.	.
Swallow	3	3	3	6	6	5	3	.	3	4	6	3	5	3	1	.
House Martin	1	2	3	3	3	3	2	.	1	3	3	1	2	1	.	.
Meadow Pipit	1	1	1	3	4	2	.	.	.	1	3	1	1	1	.	.
Rock Pipit	.	.	.	1	1	.	.	.	.	.	1	1	1	1	.	.
Yellow Wagtail	.	.	.	1	.	.	.	.	.	.	.	.	.	.	.	.
Grey Wagtail	1	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Pied Wagtail	2	1	3	3	4	5	1	.	3	2	5	3	3	2	1	.
Wren	4	4	4	6	6	5	3	.	3	4	6	3	5	4	1	.
Dunnock	4	4	4	6	5	5	2	.	3	4	3	3	4	2	1	.
Robin	4	4	4	6	6	5	3	.	3	4	6	3	5	4	1	.
Stonechat	.	.	.	1	2	1	.	.	.	1	1	1	.	.	.	.
Wheatear	.	1	.	1	1	.	.	.	.	.	.	.	.	.	.	.
Blackbird	4	4	4	6	6	5	3	.	3	4	6	3	5	4	1	.
Fieldfare	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.
Song Thrush	4	4	3	5	6	4	3	.	3	4	6	3	5	4	1	.
Mistle Thrush	2	2	2	3	3	2	2	.	2	2	2	3	2	1	1	.
Grasshopper Warbler	.	.	.	1	.	.	.	.	.	1	.	.	.	.	.	.
Sedge Warbler	1	1	2	1	1	.	2	.	.	1	2	.	2	.	.	.
Blackcap	1	2	2	2	1	1	2	.	1	1	2	1	3	2	1	.
Lesser Whitethroat	.	.	.	.	.	.	.	.	1	.	.	.	.	.	.	.
Whitethroat	3	4	3	3	2	3	1	.	2	2	3	.	2	.	1	.
Chiffchaff	1	2	.	1	1	1	1	.	.	.	1	3	1	.	.	.
Willow Warbler	2	3	3	5	3	3	3	.	3	3	4	2	3	1	.	.
Goldcrest	2	2	1	2	2	2	2	.	1	2	3	2	3	2	1	.
Spotted Flycatcher	1	.	1	.	.	.	.	.	.	1	1	1	.	.	.	.
Long-tailed Tit	2	1	.	.	.	1	2	.	.	.	.	1	1	.	1	.
Blue Tit	4	4	3	3	3	4	2	.	3	4	5	2	5	4	1	.
Great Tit	4	2	2	4	5	4	3	.	3	3	5	3	3	3	1	.
Coal Tit	1	1	3	2	1	1	1	.	3	2	5	1	.	1	1	.
Treecreeper	1	1	1	.	.	.	2	.	1	.	.	1	1	1	.	.
Magpie	3	3	4	6	5	5	3	.	3	4	6	3	5	2	1	.
Chough	1	1	1	3	2	2	1	.	.	2	3	1	2	2	.	.
Jackdaw	4	4	4	6	6	5	3	.	3	3	6	3	5	4	1	.
Rook	3	2	1	3	4	4	2	.	3	2	4	2	4	3	1	.
Carrion Crow	1	.	.	2	1	1	1	.	1	3	1	.	1	.	1	.
Hooded Crow	4	4	4	6	6	5	3	.	2	3	6	2	5	2	1	.
Raven	1	.	2	4	1	3	3	.	2	.	2	.	3	3	1	.
Starling	4	2	2	4	3	2	1	.	2	1	4	3	4	3	.	.
House Sparrow	2	2	2	3	2	4	1	.	1	3	5	3	3	2	1	.
Tree Sparrow	.	.	1	1	1	.	.	.	1	.	.	.	.	.	.	.
Chaffinch	4	4	4	6	6	5	3	.	3	4	6	3	5	4	1	.
Greenfinch	4	4	4	6	5	4	3	.	3	4	5	2	4	3	1	.
Goldfinch	1	2	3	3	4	2	2	.	1	2	4	2	4	2	1	.
Siskin	.	.	.	1	1	1	.	.	.	.	.	.	.	.	.	.
Linnet	3	1	1	5	3	3	1	.	1	3	3	3	2	1	1	.
Lesser Redpoll	.	1	1	1	.	.	1	.	2	1	1	.	1	.	.	.
Reed Bunting	.	2	.	1	2	1	2	.	1	1	2	.	.	.	.	.
Total number of Species	49	48	49	64	58	48	50	0	47	45	61	49	61	47	33	0

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