Saturday, 13 July 2013
Carmel on Friday - and a double line discussion
55 species last night including first for year dark spectacle, triple-spotted clay, small seraphim and twin-spot carpet. Top 3 were double line (16), burnished brass (11), coronet (10). Picking up on Sam's discussion of Common and Local, I generally refer to Jon's comprehensive 2006 report which gives status of a species in the County at the time (I don't think we have an easy link to it on the blog so have tried, and failed, to add it - Colin? - help!). With a marked increase in recording, the status, as I think has been pointed out before, has changed for some species. The aforementioned double line is a case in point, at least for me at Carmel. I caught 5 in 2008 and there has been an almost continuous year-on-year increase to 28 last year - with 40, so far, this year. This is with reasonably consistent trapping effort. It feeds on grasses and, according to the book, is particularly associated with rhos pasture in our area (it's nationally scarce). Although I've managed my few patches of meadow in a similar way for 20+ years there has been a program of grassland restoration in nearby Carmel NNR, so I think my increase could be down to this (although neither area could be described as rhos). It's very interesting to see that Sally has just caught her first double line when I know she has some good grasslands there. What have others found?
Posted by Mat Ridley