 |
||||||||||||||
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
||||||||
Marsh Fritillary (Euphydryas (Eurodryas) aurinia)
© Nick Greatorex-Davies
The rare Marsh Fritillary has declined severely in Britain and Ireland. It is a species of damp or calcareous grassland occurring in distinct colonies or as metapopulations where it's main foodplant Devil's-bit Scabious (Succisa pratensis) grows. (For further details on this species see http://www.butterfly-conservation.org/).
Family: Nymphalidae
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:
The Marsh fritillary is regularly recorded on five BMS transects. Numbers at individual sites fluctuate considerably in a cyclic fashion thought to be largely due to interaction with its host-specific parasites; two species of Braconid wasp of the genus Cotesia. There is no overall synchrony in the fluctuations between the sites.
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, Marsh Fritillary has been recorded from 188 transects in the Butterfly Monitoring Scheme. Of these, annual indices of abundance have been calculated from 232 sites, with an average index of 45 individuals per site.
For 89 of these sites, Marsh Fritillary has been recorded well enough to calculate annual indices of abundance in 6 or more years, allowing trends to be calculated.
In 2006, 2643 individuals were recorded from 36 sites, producing annual indices at 48 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 (8)
- Stable sites (25)
- Declining sites (12)
- Increasing sites (1)
