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Green Hairstreak (Callophrys rubi)
© Nick Greatorex-Davies
The Green Hairstreak is an increasingly localised species living in discrete colonies on calcareous grassland, scrubby grassland, heathland and moorland where its caterpillars feed, depending on habitat, on Rockrose (Helianthemum nummularium), Bilberry (Vaccinium myrtillus) and a range of mostly leguminous plants such as Gorses (Ulex spp.), Broom (Cytisus scoparius) and Bird's-foot Trefoil (Lotus corniculatis) (For further details on this species see http://www.butterfly-conservation.org/).
Family: Lycaenidae
Status: Stable
Status details:
Status since 1976 is Stable with a decrease of -26.5%
Status over the last 20 years is Stable with a decrease of -20.7%
Status over the last 10 years is Stable with a decrease of -18.2%
Back to the topLog collated index plot
This chart shows the index of abundance (LCI = Log Collated Index) over time. It shows fluctuations in populations from year to year, and is scaled so that the average index over the whole series is equal to 2 (horizontal line). For greater detail about how this index is derived, click on the green question mark above.
Trend description:
There is no significant trend in the all-sites collated index and no particular patterns show up at site level. There have been a similar number of sites where the butterfly has increased as where it has declined, but at many sites populations appear to have remained more or less stable over the monitoring period though often showing quite large fluctuations.
Distribution...
This map shows the distribution between 1995 and 1999. Data is derived from the Butterflies for the New Millenium dataset via the NBN Gateway (www.searchnbn.net).
View the distribution on the NBN GatewayPhenology...
Phenology plot
Phenology plot
This chart shows the average number of butterflies seen on transects between Arpil and October. The black line gives average counts over the full BMS series (1976 to date) and the red line gives the average for the last year.
Abundance...
Abundance
This map shows symbols for the mean abundance at transect sites, with the size of symbol reflecting the level of abundance. Means are over all years.
Coverage
In total, Green Hairstreak has been recorded from 470 transects in the Butterfly Monitoring Scheme. Of these, annual indices of abundance have been calculated from 489 sites, with an average index of 6 individuals per site.
For 231 of these sites, Green Hairstreak has been recorded well enough to calculate annual indices of abundance in 6 or more years, allowing trends to be calculated.
In 2006, 1625 individuals were recorded from 199 sites, producing annual indices at 132 of these.
This map shows the trend in abundance at particular transect sites. Trends (increasing, declining or stable) are assessed at sites where the species has more than five years of annual index data. Click on the green question mark next to the species name above for more details on how trends are calculated.
Links to lists of sites with particular statuses
• Extinct sites (6)
• Colonised sites (9)
- Stable sites (122)
- Declining sites (12)
- Increasing sites (17)
