BBS

Number of 1km squares in which each species
was recorded in Channel Isles

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	1	1	7	6	7	7	7	7	7	7	11	13	19	16	15	16
Greylag Goose	.	.	.	.	.	.	.	.	.	.	1	.	1	.	.	1
Canada Goose	.	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1
Brent Goose	.	.	.	.	.	.	.	.	1	.	.	1	.	.	.	.
Shelduck	.	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1
Mandarin	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.	1
Mallard	.	.	5	5	5	6	5	6	6	5	7	8	10	10	12	13
Feral/hybrid mallard type	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Tufted Duck	.	.	1	1	2	1	1	1	.	1	.	1	.	.	1	.
Helmeted Guineafowl	.	.	.	.	.	.	.	.	.	.	.	1	1	.	.	.
Red-legged Partridge	.	.	.	.	.	.	.	.	.	1	1	1	1	1	.	.
Grey Partridge	1	1	1	.	.	.	1	1	.	.	1	.	.	.	1	.
Reeves Pheasant	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Pheasant	.	.	4	4	3	4	4	4	6	7	8	11	13	14	12	11
Fulmar	.	.	.	.	.	.	.	.	.	.	1	1	2	1	2	2
Gannet	.	1	1	.	.	1	1	1	1	1	1	1	2	2	1	1
Cormorant	.	.	.	.	.	.	.	.	1	.	1	1	.	1	.	.
Shag	.	1	1	1	.	.	1	1	.	.	3	2	3	5	3	4
Little Egret	.	.	.	.	.	.	.	.	.	.	2	2	1	.	1	1
Grey Heron	.	.	1	.	1	1	.	1	2	1	3	3	3	2	1	3
Marsh Harrier	.	.	.	.	.	.	.	.	.	.	1	1	2	3	2	2
Sparrowhawk	.	.	2	1	2	2	1	1	2	.	1	1	3	2	3	1
Buzzard	.	.	.	.	1	.	.	.	.	.	1	.	1	1	.	1
Kestrel	1	.	6	2	3	3	4	3	3	2	2	5	7	8	8	11
Hobby	.	.	.	.	.	.	.	.	.	.	1	.	.	.	1	.
Peregrine	.	.	.	.	.	.	.	.	.	.	.	1	4	2	2	1
Moorhen	.	.	3	3	4	4	4	4	3	4	2	2	4	4	1	1
Coot	.	.	.	.	.	.	.	.	.	1	2	2	3	2	1	2
Oystercatcher	1	1	1	2	2	1	2	1	2	2	2	4	5	6	6	4
Ringed Plover	1	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Sanderling	.	.	.	.	.	.	.	.	.	.	1	.	.	.	.	.
Bar-tailed Godwit	.	1	.	.	.	.	.	1	.	.	1	.	.	1	.	.
Whimbrel	.	1	1	1	.	.	2	1	.	.	1	.	1	1	.	1
Curlew	1	1	1	1	.	.	1	.	.	.	2	.	2	1	2	.
Turnstone	.	1	.	.	.	.	.	.	.	.	.	.	.	.	.	.
Black-headed Gull	.	1	1	.	.	.	1	.	.	.	1	.	2	1	1	.
Lesser Black-backed Gull	.	.	2	.	1	1	.	2	1	2	3	1	4	8	8	8
Herring Gull	1	1	6	6	6	6	6	6	6	6	10	12	16	15	14	15
Great Black-backed Gull	1	1	1	1	2	1	2	1	1	2	4	4	7	6	9	8
Sandwich Tern	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Common Tern	1	1	.	.	.	1	1	1	.	1	1	1	.	.	.	.
Razorbill	.	.	1	.	.	.	.	.	.	.	.	.	.	.	.	.
Puffin	.	.	.	.	.	.	.	.	.	.	.	.	1	.	1	.
Feral Pigeon	.	1	4	3	4	3	3	3	2	3	6	5	10	8	9	10
Stock Dove	.	.	2	.	3	4	4	3	3	5	4	5	3	7	6	6
Woodpigeon	1	1	7	6	6	7	7	7	7	7	9	13	18	16	13	15
Collared Dove	.	.	6	5	5	4	5	4	6	6	10	12	17	14	14	13
Turtle Dove	.	.	3	4	4	2	3	1	3	.	4	2	1	1	.	.
Cuckoo	1	1	1	1	1	.	2	1	1	.	1	.	1	.	.	.
Swift	1	.	5	3	3	3	4	2	4	3	4	6	8	6	2	5
Great Spotted Woodpecker	.	.	2	2	.	4	3	4	2	2	2	4	3	5	3	2
Skylark	.	1	1	2	1	1	2	1	.	.	.	1	2	1	2	3
Sand Martin	.	.	.	.	1	1	.	.	.	.	.	.	.	.	.	2
Swallow	1	1	7	6	6	7	7	6	7	7	10	12	17	15	14	15
House Martin	1	.	4	2	4	6	5	3	5	5	6	7	6	5	4	6
Meadow Pipit	1	1	1	1	1	1	1	1	1	2	2	3	7	5	4	4
Rock Pipit	.	.	.	.	2	.	.	.	.	.	.	.	.	1	1	1
Yellow Wagtail	.	.	.	.	.	1	.	.	.	.	.	.	.	.	.	1
Grey Wagtail	.	.	.	.	.	.	.	.	1	.	.	.	.	.	.	.
Pied Wagtail	.	.	.	1	.	.	.	1	.	2	2	5	.	2	.	1
White Wagtail	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.
Wren	1	1	7	6	7	7	7	7	7	7	11	13	19	15	15	16
Dunnock	1	1	7	6	6	6	7	7	7	7	8	10	17	13	13	14
Robin	.	1	7	5	6	6	6	6	6	6	9	12	16	15	13	15
Redstart	.	1	.	1	.	.	.	.	.	.	.	.	.	.	.	.
Whinchat	.	.	.	.	.	1	.	.	.	.	.	.	.	.	.	.
Stonechat	1	1	.	.	.	1	.	.	1	1	2	1	3	1	1	1
Wheatear	1	1	.	2	1	1	1	3	1	.	.	1	3	2	2	2
Blackbird	1	1	7	6	7	7	7	7	7	7	10	13	19	15	14	16
Song Thrush	.	.	6	4	7	6	6	5	5	6	5	7	8	9	6	11
Mistle Thrush	.	.	3	1	3	.	2	1	1	1	.	1	1	1	2	.
Cettis Warbler	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.
Fan-tailed Warbler	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Sedge Warbler	.	.	.	.	1	.	.	.	.	.	.	.	2	.	1	1
Reed Warbler	.	.	1	1	.	.	.	.	.	.	.	.	.	3	.	.
Blackcap	1	1	4	4	3	5	4	6	7	6	5	7	11	11	4	10
Garden Warbler	.	.	.	.	.	1	.	1	.	.	1	1	2	1	1	.
Lesser Whitethroat	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.
Whitethroat	1	1	2	2	2	2	2	2	1	1	2	2	6	5	6	6
Dartford Warbler	.	.	.	.	.	.	.	.	.	.	.	.	2	3	1	1
Chiffchaff	1	1	6	5	6	7	6	6	6	6	9	11	16	13	11	13
Willow Warbler	.	.	2	1	.	3	1	3	2	.	1	1	3	5	.	3
Goldcrest	.	.	5	3	2	5	5	4	3	4	4	6	2	6	2	2
Spotted Flycatcher	.	.	2	1	2	2	2	1	.	.	.	.	.	.	.	.
Pied Flycatcher	.	.	.	.	.	.	.	.	.	.	.	.	1	.	.	.
Long-tailed Tit	.	.	2	1	1	3	3	3	5	4	4	5	6	4	3	4
Blue Tit	.	.	6	5	6	6	6	6	6	6	7	10	13	13	11	13
Great Tit	1	1	7	6	7	7	7	7	7	7	8	13	18	16	13	14
Coal Tit	.	.	.	.	.	.	.	.	1	.	1	.	.	.	.	.
Marsh Tit	.	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1
Short-toed Treecreeper	.	.	3	3	2	4	3	3	4	1	2	3	3	.	1	1
Jay	.	.	3	2	2	2	1	2	3	3	4	8	7	5	6	6
Magpie	.	.	6	5	6	6	6	6	6	6	10	12	15	15	13	15
Jackdaw	.	.	.	.	.	.	.	.	.	.	1	.	3	1	4	2
Carrion Crow	1	1	7	6	7	7	7	7	7	7	11	13	19	16	15	16
Raven	.	.	.	.	.	.	.	.	1	1	.	.	1	.	1	1
Starling	1	1	7	5	6	7	5	6	5	6	9	12	14	13	13	12
House Sparrow	1	.	6	6	6	6	6	6	6	6	10	12	16	14	13	14
Chaffinch	1	.	5	4	5	5	6	6	5	5	7	12	18	15	12	15
Greenfinch	1	1	6	5	5	5	6	6	6	6	11	13	16	15	14	15
Goldfinch	.	1	6	5	6	6	6	7	6	4	9	8	12	11	11	11
Linnet	1	1	7	6	5	4	5	4	4	5	7	8	10	6	7	8
Bullfinch	.	.	2	.	.	2	1	1	.	1	.	2	3	1	2	2
Yellowhammer	.	.	1	1	1	1	1	1	1	1	1	.	.	.	.	.
Reed Bunting	.	.	.	.	.	.	.	.	.	.	.	.	.	.	1	.
Total number of Species	29	34	58	53	52	56	56	59	54	51	68	64	75	68	67	68

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