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boscombe update |
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will
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1830 |
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Posted: 21 Jul 2011 at 8:34pm |
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I stopped off at Boscombe today, with warm and overcast conditions suggesting lizards would be out and about; saw around 60 wall lizards, many still paired up with females looking ready to lay a second clutch, about 10 green lizards and 1 solitary viviparous lizard at the top of the zig-zag. It occurred to me that as and when sand lizard and viviparous lizard are rendered extinct by wall lizards, it would be fun to drop some smooth snakes onto the cliffs - they'd not be short of food! (only joking, sort of..)
Part of the cliffs burned out, but plenty of habitat remains: |
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herpetologic2
Forum Coordinator Joined: 15 Jun 2004 Location: United Kingdom Status: Offline Points: 1511 |
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Hi Will
Do you think that the current management regime on the accessible areas push the viviparous/sand lizards out while the greens and walls seem to be increasing due to increases in detectability due to their behaviour? I am certain that there have been surveys which have produced higher numbers of viviparous or at least similar numbers to walls. I am gonna have to go down there to check this out for myself - I would also suggest that the genetic research into the walls will reveal some interesting facts about the future of the population..... |
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will
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1830 |
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very difficult to assess, especially as I'm only an occasional visitor. However my impression is that there are fewer viviparous lizards this year. It's also true that the gorse management is over-zealous which to my mind would affect the viviparous lizards, which prefer more humid, well vegetated habitats than the wall lizards.
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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fab pix as always Will - and interesting proposals! thanks for posting.
i must get down there again soon! cheers, ben |
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Richard2
Senior Member Joined: 01 Dec 2010 Status: Offline Points: 285 |
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There are plenty of Common Lizards elsewhere. Why not protect the introduced species as much as possible in this particular place?
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will
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1830 |
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Hi Richard - I guess I was being deliberately provocative... however, I reckon the wall lizards would still persist in good numbers (and adult green lizards are too big for smooth snakes in general). You would gain a thriving population of smooth snakes in an unusual (for them in the UK) clifftop habitat, and being our rarest snake I reckon that could be a good thing. Meanwhile the wall and green lizards would still be present. But, given that it would never be officially sanctioned, you needn't worry!
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Richard2
Senior Member Joined: 01 Dec 2010 Status: Offline Points: 285 |
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I suppose I was being provocative too. I'm delighted by the presence of these Green and Wall Lizards.
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herpetologic2
Forum Coordinator Joined: 15 Jun 2004 Location: United Kingdom Status: Offline Points: 1511 |
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I was also being provocative as it is not the walls or the greens which will make the native lizards extinct at Boscombe - it is the habitat management regime - burns, removal of 'humid' habitat (favoured by viviparous lizards), plus isolation from any other population of either sand or viviparous lizard it is very much a lost cause for the native lizards.
Eradication of the walls I think would be impossible now wouldn't it? The other point is that there is an assumption that the viviparous lizards are actually declining as the detectability of this species at the sort of temps/conditions you would find either walls or greens would give the impression that the viviparous lizards are declining. Looking at past surveys of the habitat and the sightings of each species there is very much a relationship between the removal of grass/gorse/scrub stands and the increase in green/wall sightings and the subsequent reduction in the number of viviparous lizard sightings. I think that the sand lizards have pretty much 'folded' on the more accessible parts of the site. I really would like to get down there this year. At the BHS/ARC meeting a few years back wall lizards were seen in December! |
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AGILIS
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1689 |
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point is who said there werent any ca there as cliff hanging aint allowed and the would be harder to see keith
Edited by AGILIS - 26 Jul 2011 at 6:47am |
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LOCAL ICYNICAL CELTIC ECO WARRIOR AND FAILED DRUID
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liamrussell
Senior Member Joined: 13 Jan 2005 Status: Offline Points: 100 |
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I don't know if I agree with this entirely. There is still lots of suitable habitat for viviparous lizards on the cliffs. The habitat there is ideal for the wall lizards and not so good for the natives so walls have a major competitive advantage. Without the wall lizards I think the natives would hang on, just. The habitat management is probably having an effect, but it is just tipping the balance even further in the wall lizard's favour and speeding up the inevitable. That's not to mention possible disease risk...
I do agree with this, both from a practical and political standpoint. But I don't think we want to go down this route again as it has a habit of getting a bit heated on this forum...
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