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Pool Frog programme coming up |
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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keep it accurate Caleb
It was not my suggestion that the area would be under the sea in 20 years I stated:
You see it states if some scientists have the calculations right. In other words a worse case scenario. We already very nearly had a breech of the sea wall locally during the spring high tides. So thinking this is not some sort of possible reality is a little blinkered. You yourself stated that a 1m rise in sea level is predicted in 100 years so where is my vast exaggeration? Is a factor of '5' vast in terms of predictive calculation? I think also you will find the predictive map is just representative. It might not appear directly connected to the sea but would this not depend on spring high tides etc rather than a predictive snap shot? If it is fresh water then the problem is solved eh. Perhaps you cannot address the issues that the Northern Clade could not have actually colonised the UK naturally and also the fact there isn't now any large areas of suitable habitat in the area for the Pool Frogs to colonise in the future as you seem to be spending too much time worrying about the maps. It clearly shows what you asked, what is the result of a 1m rise in sea level. The result is the fens become the sea again. Simple isn't it. To prevent the flooding would require a 1m rise in the sea defenses would it not rather than increased pumping exercises? I think you should look at the environment agencies polices regarding sea defense in East Anglia. You will find the policy is to accept that some areas will be reclaimed by the sea in future years rather than raising the sea defenses around the entire coast line.
Edited by GemmaJF - 08 Aug 2012 at 3:23pm |
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Caleb
Senior Member Joined: 11 Apr 2011 Status: Offline Points: 660 |
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The Thetford area (including the last pool frog site and the reintroduction site) is about 40m above sea level. The lowest parts of the Fens are below sea level, but they are not underwater, as they're pumped dry. If water levels increase, either pumping will have to be stepped up to keep them dry, or they will flood. The site you mentioned generated the map below for a 1m rise in sea level. As the flooded areas of the Fens are not directly connected to the sea, they wouldn't necessarily be 'flooded by sea water'. Either way, your suggestion that 'the whole area will be back under the sea in 20 years' is clearly a vast exaggeration. |
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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It is subtle though I guess Richard, I think alpine newts are really lovely and tend to exist in small populations. Yet on the other hand one 'could' consider the Italian Crested Newt as a serious threat. Deliberately introduced and able to hyrbridise with native Great Crested newts they do pose a threat to the genetic integrity of native newts and are therefore regarded as a fairly serious issue when they are discovered.
One could though say does it actually matter much? I'm sure the grass snakes in Epping Forest have a little bit of foreign blood in them. (and dare I say Chris so might some of the early Sand Lizard re-introductions??) If one considers that as a species ourselves we seem to generally be moving as far away from genetic integrity of races as possible and find any other concept (such as the Nazi ideal) abhorrent it does seem a little odd we will still apply the same logic of genetic purity to wildlife. At the end of the day where we are now does any of it matter at all, the bigger issues seems to be whether or not any species of amphibian is going to survive with the global declines of previously unseen proportion. What the exact genes are of those hopping about in the UK seems only a small point in comparison. The genetic make-up of these different races of animals only formed through a series of chance natural events in any case. I guess at the end of the day if the Pool Frog re-introduction is anywhere near as successful as past Marsh Frog introductions I can have egg on my face and we all will have something to smile about. For some reason though I'm struggling to identify the vast tracts of suitable habitat where the Pool Frogs will eventually expand into.
Edited by GemmaJF - 08 Aug 2012 at 2:44pm |
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Richard2
Senior Member Joined: 01 Dec 2010 Status: Offline Points: 285 |
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I think we agree on just about every point, really; perhaps a difference of emphasis only.
Of course, a free-for-all policy on introductions would be very dangerous to native species - I can see that. The recent Signal Crayfish thread gives us a prime example. But where an introduction has occurred without causing a significant problem, we should celebrate it rather than fetishizing nativeness. Alpine Newts are beautiful and exciting. As far as I know they constitute no serious threat to anything. I want them here. A policy that demands they should be killed on sight is a symptom of bureaucratic callousness, in my view.
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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40m / below sea level you don't seem too sure Caleb, actually with a 1 m rise in sea level the fens are still predicted to be flooded by sea water, take a look for yourself: |
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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I don't think they should be extripated, I love Marsh frogs and have many happy memories of splitting my sides listening to them cackling away. Unfortunately if you ask NE what to do with them if they are caught up in mitigation works, they will say you cannot release them again. In Kent where they are widespread they no doubt also support a huge number of grass snakes, so I'm all for them. Further more they tend to be found in areas where common frogs would not thrive so I really think now they should just be 'adopted' as naturalised. It's just a technical issue under the WCA regarding release of aliens into the wild though one would hope the local NE team would be more pragmatic their responses to me in the past they have stated that marsh frogs should be destroyed if caught. Of course one always has one worker who is rubbish at holding marsh frogs in reality, so personally I have never been involved in any executions! My point is that on the one hand NE can sanction a 're-introduction' of Pool Frogs yet on the other have the policy that marsh frogs accidentally caught up in mitigation works cannot be re-released.
I actually totally agree. My own view is people are a natural phenomenon, if they introduced animals to an area either by mistake or by design it is part of a natural process. On the other hand I would not encourage people to introduce aliens for the obvious reason that we simply don't know what might happen particularly in terms of impacts on natives species.
That is a fair point but the money and resources could have been placed elsewhere. Lets just say the project has more in my opinion to do with the ability of a handful of people to influence NE rather than a lot of merit as a ground breaking conservation exercise. |
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Caleb
Senior Member Joined: 11 Apr 2011 Status: Offline Points: 660 |
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I am familiar with the Fens- I lived there for some time. There were fields below sea level within a couple of miles of our house. No-one's seriously predicting a 7m sea level rise- most estimates seem to be more like 1m in the next century. How does the map look with a 1m rise? |
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Richard2
Senior Member Joined: 01 Dec 2010 Status: Offline Points: 285 |
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And my old university trembles on the edge.
But Marsh and Edible Frogs, as they used to be called, were introduced long ago and are in all the old wildlife books. Do you really think they should now be rounded-up and extirpated? I don't get this. I can understand wanting to remove introduced species if they really threaten native ones (grey squirrels because of the danger to reds, for example), but it isn't because of Marsh and Edibles that the Common Frogs are declining.
The basic idea here seems to be that we should try to freeze natural processes at a particular moment. It was OK, presumably, for prehistoric Pool Frogs to cross from the land that became Scandinavia, but movement of species is not OK now. That seems inconsistent to me. Shouldn't biodiversity rather than an arbitrary concept of nativeness be the fundamental principle?
I quite agree with you about the inconsistency between the reintroduction policy and the weakness over habitat-destruction, but the answer isn't to stop the reintroduction policy so as to achieve consistency with the weakness.
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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PS I've just realised on that predictive map that my house has gone too! (though we are actually 9m above sea level so I should still be on a tiny island)
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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It's not just a policy in Kent Richard, to make it clearer, it is an offence to release an alien under the WCA. So marsh frogs, alpine newts, midwife toads and more caught in the wild in the UK cannot be re-released. You might have seen the thread recently where Will removed alpine newts from a pond and then had to keep them at home.
But it is OK to put some Pool Frogs in a nature reserve in Norfolk from Europe.. I can't help seeing a little irony when locally we have a massive decline in common frogs and NE couldn't give a fig if local ponds are filled in.
Edited by GemmaJF - 08 Aug 2012 at 12:24pm |
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