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Swallowtail (Papilio machaon)
© Nick Greatorex-Davies
The Swallowtail has a highly restricted distribution in Britain occurring only in the open fens and marshes of east Norfolk where its foodplant Milk-parsley (Peucedanum palustre) grows. It was formerly more widespread. (For further details on this species see http://www.butterfly-conservation.org/).
Family: Papilionidae
Status: Insufficient information
Status details:Insufficient information
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:
Counts at Bure Marshes in Norfolk, the only BMS transect where this species has been regularly recorded, indicate that the population of this species at the site is stable.
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, Swallowtail has been recorded from 114 transects in the Butterfly Monitoring Scheme. Of these, annual indices of abundance have been calculated from 4 sites, with an average index of 0 individuals per site.
For 0 of these sites, Swallowtail has been recorded well enough to calculate annual indices of abundance in 6 or more years, allowing trends to be calculated.
In 2006, 35 individuals were recorded from 3 sites, producing annual indices at 0 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
Insufficient information
