Newsletter 17, Page 2
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by Dr A.F.Seager (Another article from ‘The Lizard – the Magazine of The Lizard Field Club’ first published 1957
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The Glow-worm Lampyris noctiluca
Male Female Fifty years ago glow-worms were common in the British countryside, so common that in some localities people could read by their light. Now they are rare, probably because of the loss of meadows and grassland. Glow-worms, relatives of tropical fire-flies, take their name from the female which emits the light. During the day the wingless females hide from predators, but at night they crawl on to vegetation so that they can display their light most effectively to attract males. The glow-worm’s light is produced by cells that use oxygen, water and an enzyme to form the light-emitting substance oxyluciferin. The light is enhanced by a layer of reflector cells. In the early evening the glow is yellowy-green but changes to a brighter yellow after dark. A female emits light at will when she wants to attract males. The light is surprisingly intense for such a small source. The male has excellent sight to spot the female at up to ten yards and wings to reach her. Each compound eye in the male is eight times more powerful than the female’s with 2,500 facets compared with 300. The male pinpoints the female accurately, and when directly above, closes his wings and drops on to her. My sister and I walked up Polcoverack Lane late one summer’s evening in the early 1950s collecting glow-worms in a jamjar. We thought they were wonderful. On discovering the hapless creatures in our bedroom mother immediately returned them to their more natural habitat! Nowadays their descendants can still be found in the hedgerows of the Peninsula. |
Night Blight
CPRE National Office has suggested amendments to the Planning and Compulsory Purchase Bill, that would bring lighting under full planning control.
Light itself is not classified as development. Regardless of the intrusiveness of a light beam, if a fixture does not significantly alter the appearance of a building and/or it is not a free-standing structure, the light itself cannot be classed as development and is not subject to planning controls nor is it specifically listed as a statutory nuisance. As a result many Local and Environmental Health Officers are reluctant to take action simply because there is so much confusion about whether and how light pollution can be classified as a statutory nuisance. CPRE proposes the introduction of statutory enabling provisions which will make provision for restricting the use of external lighting. It will also provide for enforcement control including prosecution and fines and give powers for the removal of unauthorised lights. The advantages of these new provisions will be that
- they will provide a self-contained code through regulations for the control of lighting
- where planning consent is granted it can be made subject to conditions e.g. limiting the hours of operation
there is a precedent for this approach in the regime applicable to advertisements.
CPRE intend to launch
their
Night Blight
campaign in
May.
with thanks to the CPRE Planning Review March 2003
The Lizard Lighthouse
Newsletter Page 2