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Marbled White (Melanargia galathea)

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

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Picture of Marbled White
© Nick Greatorex-Davies

The Marbled White is a mostly southern species in Britain occurring in well defined colonies in tall open unimproved calcareous, or sometimes neutral, grassland where its main larval foodplant, Red Fescue (Festuca rubra), grows in abundance. The butterfly is expanding its range in Britain. (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 57%
Status over the last 20 years is Stable with a decrease of -17.6%
Status over the last 10 years is Stable with a increase of 62%

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 :
The collated indices have shown large fluctuations in abundance and there is a high degree of synchrony between many sites. Accounting for these fluctuations the overall trend shows a non-significant increase in abundance over the whole monitoring period, although more recently there has been a decline. The butterfly is expanding its range in parts of Britain, probably in response to climate change, and at many sites there have been significant increases in abundance. In addition several sites have been colonised.

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, Marbled White has been recorded from 586 transects in the Butterfly Monitoring Scheme. Of these, annual indices of abundance have been calculated from 625 sites, with an average index of 92 individuals per site.

For 309 of these sites, Marbled White has been recorded well enough to calculate annual indices of abundance in more years, allowing trends to be calculated.

In 2016, 46111 individuals were recorded from 332 sites, producing annual indices at 277 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.