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Mazarine Blue (Polyommatus (Cyaniris) semiargus)
© Nick Greatorex-Davies
The Mazarine Blue became extinct in Britain in the early 1900s (last records of a resident colony 1904). Though formerly quite widespread in southern Britain it was apparently always scarce. It is still widespread and common in mainland Europe though declining in some areas. Its main larval hostplant is Red Clover (Trifolium pratense). (For further details on this species see http://www.butterfly-conservation.org/).
Family: Lycaenidae
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:
There are no records of this butterfly on BMS transects.
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).
Phenology...
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
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
