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Silver-washed Fritillary (Argynnis paphia)

On this page, we have made available all the information we have for this species

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Picture of Silver-washed Fritillary
© Eddie John

The Silver-washed Fritillary is a woodland butterfly whose larvae feed on violets (Viola spp.). It tolerates a greater degree of shade than other violet feeding fritillaries and its decline has generally been less severe (For further details on this species see http://www.butterfly-conservation.org/).


Family : Nymphalidae

Status : Rapid increase

Status details :
Status since 1976 is Rapid increase with a increase of 153%
Status over the last 20 years is Rapid increase with a increase of 119%
Status over the last 10 years is Stable with a increase of 8%

Log collated index plot

Species Log 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 :
This species was showing a steady increase up until 1996. In 1998 it experienced the biggest drop in numbers since the 1977 crash that followed the drought of 1976. There was no drought in 1997 and the reasons for this second big drop are not known. Since 1998 numbers have increased again and the overall trend is of significant increase. This is a butterfly that has been expanding its range north and eastwards and has now been recorded on more different transects than any other fritillary in the UK, although these are greatly condensed in the south-west.

This map shows the distribution between 1995 and 2016. Data is derived from the Butterflies for the New Millenium dataset via the NBN Gateway

Phenology plot
Species Phenology Plot

Phenology plot

This chart shows the average number of butterflies seen on transects between Arpil and October across all sites (fitted values from a Generalised Additive Model). The blue line gives average counts over the full BMS series (1976 to date) and the red line gives the average for the last year.

Species abundance map

Abundance

This map shows symbols for the mean abundance at transect sites, with the colour of the symbol reflecting the level of abundance. Means are over all years. Grey background squares are the occupied cells as shown by the Butterflies for the New Millenium over the previous ten year period.


Coverage

In total, Silver-washed Fritillary has been recorded from 405 transects in the Butterfly Monitoring Scheme. Of these, annual indices of abundance have been calculated from 420 sites, with an average index of 19 individuals per site.

For 201 of these sites, Silver-washed Fritillary has been recorded well enough to calculate annual indices of abundance in more years, allowing trends to be calculated.

In 2016, 11768 individuals were recorded from 220 sites, producing annual indices at 180 of these.


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.