Monarch (Danaus plexippus)
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© Eddie John
The Monarch, our largest butterfly, is a rare and sporadic migrant to Britain and Ireland. The majority of sightings are in the south-west of Britain. Although the butterfly now breeds in the Canary Isles and in a very restricted area in Spain, these migrants almost certainly originate from North America, as their arrival to our shores usually corresponds with major migrations there coinciding with favourable weather conditions that bring them across the Atlantic. (For further details on this species see http://www.butterfly-conservation.org/).
Status : Insufficient information
Status details : Insufficient information
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 :
With only one record of this species on a transect since 1976 there is insufficant data to calculate abundance trends.
This map shows the distribution between 1995 and 2016. Data is derived from the Butterflies for the New Millenium dataset via the NBN Gateway
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.
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.
In total, Monarch has been recorded from 0 transects in the Butterfly Monitoring Scheme. Of these, annual indices of abundance have been calculated from 0 sites, with an average index of 0 individuals per site.
For 0 of these sites, Monarch has been recorded well enough to calculate annual indices of abundance in more years, allowing trends to be calculated.
In 2006, 1 individuals were recorded from 1 sites, producing annual indices at 0 of these.
This map shows the trend in abundance at particular transect sites for which data has been received within the last five years. Trends (increasing, declining or stable) are assessed at sites where the species has more than five years of annual index data. Use the option boxes below to view plots for individual sites.
Links to lists of sites with particular statuses