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Porton Down
The map shows you the route that this butterfly transect follows.
| County: | Wiltshire (England) |
| Gridref: | SU2435 |
| Year established: | 1994 |
| Number of sections: | 15 |
| Altitude (m): | Unknown |
| Length (m): | 2700 |
| Width (m): | 5 |
| Broad habitat: | Dry semi/unimproved (flower rich) chalk/limestone grassland |
Species list...
The following species have been recorded on this site:
| Species | Status | Colonised/extinct | Asynchronous | Mean count | ||
| Orange Tip | ? | 0 | .43 | more | ||
| Purple Emperor | ? | 0 | .41 | more | ||
| Ringlet | Decreasing | 9 | .0 | more | ||
| Dark Green Fritillary | Stable | 230 | more | |||
| Pearl-bordered Fritillary | ? | 0 | .21 | more | ||
| Silver-washed Fritillary | ? | 0 | .23 | more | ||
| Brown Argus | Stable | 53 | more | |||
| Green Hairstreak | Stable | 15 | more | |||
| Holly Blue | Stable | 1 | .4 | more | ||
| Small Heath | Stable | 290 | more | |||
| Clouded Yellow | Stable | 0 | .75 | more | ||
| Small Blue | Stable | 8 | .7 | more | ||
| Dingy Skipper | Stable | 23 | more | |||
| Grayling | ? | 0 | .35 | more | ||
| Marsh Fritillary | ? | 0 | .060 | more | ||
| Brimstone | Increasing | 24 | more | |||
| Duke of Burgundy Fritillary | ? | 0 | .51 | more | ||
| Silver-spotted Skipper | Stable | 85 | more | |||
| Small Copper | Stable | 45 | more | |||
| Adonis Blue | Stable | 1 | .2 | more | ||
| Chalk-hill Blue | Stable | 16 | more | |||
| Meadow Brown | Stable | 1900 | more | |||
| Gatekeeper / Hedge Brown | Stable | 8 | .7 | more | ||
| Marbled White | Decreasing | 130 | more | |||
| Peacock | Stable | 12 | more | |||
| Large Skipper | Stable | 6 | .5 | more | ||
| Speckled Wood | Increasing | 3 | .5 | more | ||
| Wall Brown | ? | 0 | .49 | more | ||
| Large White | Stable | 20 | more | |||
| Green-veined White | Increasing | 2 | .5 | more | ||
| Small White | Stable | 13 | more | |||
| Comma | ? | 0 | .54 | more | ||
| Common Blue | Stable | 260 | more | |||
| Grizzled Skipper | Stable | 23 | more | |||
| Small Skipper | ? | 2 | .6 | more | ||
| Red Admiral | Stable | 2 | .9 | more | ||
| Painted Lady | Stable | 1 | .9 | more | ||
| Small/Essex Skipper | Decreasing | 29 | more | |||
This table shows the species that have been recorded on this site. Where sufficient data is available, trends in abundance are assessed and colonisation/extinction events are identified. Species are marked as 'asynchronous' when their trends on this site are markedly different from the national trend. Click on 'more' to see a plot of abundance through time for each species. See green question mark above for more details.
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