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Porton Dn.2 (Tower Hill Wood)

Here we provide all the information we have for each transect site.

For example, clicking on one of the section titles below will display the site description (shown automatically), as well as a list of the species recorded here, and their yearly counts. However, you can also chose to Show All the sections, or even Hide All, if you so wish.

Map of Porton Dn.2 (Tower Hill Wood)

The map shows you the route that this butterfly transect follows.


County : England(Wiltshire)
Gridref : SU240387
Year established : 1995
Number of sections : 12
Altitude (m) : 136
Length (m) : 2700
Width (m) : 5
Broad habitat : Mature mixed broadleaved and coniferous woodland
The following species have been recorded on this site:
SpeciesStatusColonised / ExtinctMean Count 
Essex/Small SkipperDeclining 52.36 more
Small SkipperDeclining 23.91 more
Essex Skipper? 0.63 more
Silver-spotted SkipperStable 2.27 more
Large SkipperStable 41.05 more
Dingy SkipperStable 62.23 more
Grizzled SkipperStable 51.03 more
Clouded Yellow? 0.53 more
BrimstoneStable 82.09 more
Large WhiteDeclining 39.57 more
Small WhiteStable 17.75 more
Green-veined WhiteStable 13.21 more
Orange-tipStable 3.06 more
Green HairstreakStable 30.99 more
Brown Hairstreak? 0.34 more
Small CopperStable 11.07 more
Small BlueStable 9.07 more
Brown ArgusStable 90.86 more
Common BlueStable 343.96 more
Chalk Hill BlueStable 1.39 more
Adonis Blue? 1.06 more
Holly BlueStable 3.43 more
Duke of BurgundyStable 10.93 more
Purple Emperor? 0.15 more
Red AdmiralStable 4.15 more
Painted LadyStable 1.25 more
Small TortoiseshellStable 3.11 more
PeacockStable 28.99 more
CommaStable 2.87 more
Small Pearl-bordered Fritillary? 0.06 more
Pearl-bordered FritillaryStable 4.23 more
Dark Green FritillaryStable 488.53 more
Silver-washed FritillaryIncreasing 2.30 more
Marsh FritillaryStable 6.90 more
Speckled WoodIncreasing 63.25 more
Wall? 0.13 more
Marbled WhiteStable 488.07 more
GatekeeperDeclining 70.66 more
Meadow BrownDeclining 2021.53 more
Small HeathStable 361.62 more
RingletStable 150.47 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. Click on 'more' to see a plot of abundance through time for each species. See green question mark above for more details.


The UKBMS is run by  Butterfly Conservation (BC), the Centre for Ecology and Hydrology (CEH) and the British Trust for Ornithology (BTO), in partnership with the Joint Nature Conservation Committee (JNCC), and supported and steered by Forestry Commission (FC),  Natural England (NE), Natural Resources Wales (NRW), Northern Ireland Environment Agency (NIEA), and Scottish Natural Heritage (SNH). The UKBMS is indebted to all volunteers who contribute data to the scheme.