Our Wildlife Trust Officer for Carmarthen; Rebecca Killa, has been surveying Marsh Fritillary. Here's her update...
Marsh fritillary’s have had a good year at Rhos Cefn Bryn Nature Reserve! Marsh Fritillary caterpillars weave conspicuous webs during late summer, and by looking for and recording these webs we can monitor the population within the site. The best days to survey for them are bright and sunny days when you can observe the larvae out basking and enjoying the last of the summer’s sun. This was certainly the case when we went out earlier this month on Rhos Cefn Bryn. We found 21 webs, which is a good number of webs for the site in recent years and we were privileged to see lots of active and basking caterpillars.
Marsh fritillary’s are threatened across much of the UK and Europe, they have seen severely declining numbers in the last century. Rhos Pasture, marsh fritillary’s preferred habitat, was once abundant in Carmarthenshire and loss of this habitat is having severe effects on this beautiful butterfly.
Pictures taken at Rhos Cefn Bryn; September 2017