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PREDOMINANT SNAKE |
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AGILIS
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1689 |
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Posted: 20 Jun 2011 at 7:11pm |
Apart from adder sitings does anyone think the smooth snake in some of the Dorset sites could be the predominant snake, as some areas I have seen more the our other two. As herpo surveys must have some statistics on them?
Edited by AGILIS - 20 Jun 2011 at 7:14pm |
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LOCAL ICYNICAL CELTIC ECO WARRIOR AND FAILED DRUID
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David Bird
Forum Specialist Joined: 11 Apr 2011 Location: Dorset Status: Offline Points: 6 |
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On several Dorset heathland sites that I work on, the Smooth Snake is the most numerous snake with Grass Snake 2nd and Adder a poor third place.
David
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dave fixx
Senior Member Joined: 13 Mar 2007 Location: Wales Status: Offline Points: 411 |
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David, If you just worked on figures of snakes encountered basking and not under refugia,do the rankings alter for these sites?
Dave |
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Dave Williams
davewilliamsphotography.co.uk |
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Vicar
Senior Member Joined: 02 Sep 2004 Location: United Kingdom Status: Offline Points: 1184 |
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You can work out some stats here: http://www.surrey-arg.org.uk/cgi-bin/statistics/ObservabilityStats2.asp
Although not exactly what you want, as this compares all sites where the species is seen, and does not compare sightings at any particular site. A lot depends on time of year too, with a large peak in Ca observations in August (mostly females). Also worth noting that Ca dominance can occur on one section of a site and adder dominant at other areas (such as woodland margins). It's a complex question :P - but there's no doubt that where Ca does occur, it can be very numerous and out-compete the other snake species given favourable conditions - partly because they will delight in eating juvenile snakes of other species...and probably even their own. We have some parts of sites in Surrey where you don't get adders...just Ca and the occasional nomadic Nn. There are also areas where you can find all 3 snake species under one tin. Edited by Vicar - 23 Jun 2011 at 2:32pm |
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Noodles
Senior Member Joined: 05 Dec 2010 Location: United Kingdom Status: Offline Points: 534 |
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Great little toy that Vicar
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