the Forth Naturalist Historian - Forth Naturalist and Historian ...
the Forth Naturalist Historian - Forth Naturalist and Historian ...
the Forth Naturalist Historian - Forth Naturalist and Historian ...
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<strong>Forth</strong> <strong>Naturalist</strong> <strong>and</strong> <strong>Historian</strong>, volume 22 55<br />
THE ODONATA (DRAGONFLIES) OF THE FORTH AREA<br />
E. M. <strong>and</strong> R. W. J. Smith<br />
In 1905 William Evans, FRSE, read a paper with <strong>the</strong> above title to <strong>the</strong> Royal<br />
Physical Society of Edinburgh (Evans 1904-6). His account of <strong>the</strong> status of <strong>the</strong><br />
various species 100 years ago makes an interesting comparison with present<br />
day knowledge. He recorded 11 species of dragonflies in ‘<strong>Forth</strong>’, all still<br />
present, with one recent addition.<br />
William Evans, 1851-1922, was an enthusiastic field naturalist with a<br />
thorough knowledge of systematic botany <strong>and</strong> zoology. His work on local<br />
natural history spanned species from mammals to protozoa, <strong>and</strong> from<br />
flowering plants to fungi. He described several species new to science besides<br />
adding many to <strong>the</strong> British, <strong>and</strong> particularly to <strong>the</strong> Scottish, lists. Evans<br />
published over 100 papers on every aspect of Natural History. He was elected<br />
a Fellow of <strong>the</strong> Royal Physical Society in 1880 <strong>and</strong> a Fellow of <strong>the</strong> Royal Society<br />
of Edinburgh in 1884. In 1906 his Presidential Address to <strong>the</strong> Royal Physical<br />
Society was on “Our Present Knowledge of <strong>the</strong> Fauna of <strong>the</strong> <strong>Forth</strong> Area”.<br />
Calopteryx virgo: The Beautiful Demoiselle, a magnificent blue-winged<br />
damselfly of running waters, was recorded by Evans in 1896 <strong>and</strong> 1905 in <strong>the</strong><br />
vicinity of Aberfoyle but not elsewhere in ‘<strong>Forth</strong>’. There have been recent<br />
sightings in <strong>the</strong> same area <strong>and</strong> <strong>the</strong> distribution of this species appears to have<br />
changed very little. This is a damselfly that could well repay more study into<br />
its present breeding sites in <strong>the</strong> Aberfoyle district. Evans quotes Stewart (1809)<br />
that C. virgo occurred in <strong>the</strong> neighbourhood of Edinburgh during that period<br />
<strong>and</strong> that, in 1841, it was included in a list of insects in <strong>the</strong> parish of Dollar, in<br />
<strong>the</strong> New Statistical Account. It would appear that C. virgo was much more<br />
widespread 200 years ago than at present.<br />
Lestes sponsa: The Emerald Damselfly occurs throughout ‘<strong>Forth</strong>’ in good<br />
numbers. Curiously <strong>the</strong> only record Evans personally had of this species in<br />
‘<strong>Forth</strong>’ was of one in <strong>the</strong> Call<strong>and</strong>er area although “… it is common … (at)<br />
Dalmally …” Evans collected Ischnura elegans at Aberlady between July <strong>and</strong> 9<br />
August 1898 but did not record L. sponsa which is a late summer species. It is<br />
now extremely common <strong>the</strong>re <strong>and</strong> would be difficult to miss. This species is<br />
now so widespread <strong>and</strong> numerous in ‘<strong>Forth</strong>’ that it is tempting to suggest that<br />
it has increased <strong>and</strong> spread greatly in <strong>the</strong> area in <strong>the</strong> last 100 years.<br />
Pyrrhosoma nymphula: Evans gives <strong>the</strong> Large Red Damselfly as “… widely<br />
distributed throughout <strong>the</strong> area <strong>and</strong> is still locally common.” He correctly<br />
describes its habitat as “ … <strong>the</strong> margins of peat pools, ponds <strong>and</strong> ditches …<br />
(etc).” The status of this species (<strong>the</strong> only red damselfly in Scotl<strong>and</strong>) seems still<br />
to be <strong>the</strong> same – common except on <strong>the</strong> eastern coastal s<strong>and</strong>y areas.<br />
Ischnura elegans: The Blue-tailed Damselfly was “ … widely distributed <strong>and</strong><br />
common locally” 100 years ago. This is still true today of this small, ra<strong>the</strong>r