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Posts by Tom Lawlor: |
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Tom Lawlor Member Joined: 24 Jun 2004 No. of posts: 3  View other posts in this topic |
Posted: 28 Jun 2004
Topic: Please help - GCN
I am interested in obtaining data to support/disprove the hypothesis that GCN
require deep open water with, in particular, nil to zero fish populations. It is, understandably, proving difficult to obtain specific information relating to individual newt habitats. I do not require the exact locations although it would prove useful if the topography was known together with the regional area. The hypothesis forms the basis of an Open University project. I require two sets of data - ponds with fish populations and ponds without / with benign populations. The intention is to analyse the data and attempt to correlate factors that are based on actual sites throughout the UK. You would of course be welcome to a copy of the final project and data. Would it be possible to solicit yourself and other colleagues in order to obtain specific data? If not could you, please, suggest an alternative avenue. (I complete an Hons Degree in Environment next year, and I have also managed to gain diplomas in Pollution Control and Environmental Policy). Regards, Tom Tom Lawlor |
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Tom Lawlor Member Joined: 24 Jun 2004 No. of posts: 3 View other posts in this topic |
Posted: 30 Jun 2004
Topic: Please help - GCN
Caleb, Thank-you for the reply. I have, so far, contacted great number of organisations, but with limited success. I have obtained some specific data - GCN's in ditches 2 m wide, ponds no more than 50 cm deep (population of approximately 300) and one pond that had GCN's prior to the stocking of carp by an angling club. The latter was some time ago, but it shows that even so called benign species, stocked in sufficient numbers, can have a disastrous effect Tom Tom Lawlor |
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Tom Lawlor Member Joined: 24 Jun 2004 No. of posts: 3 View other posts in this topic |
Posted: 30 Jun 2004
Topic: Please help - GCN
Gemma, I suppose itĘs a possibility, it all depends on the level of stocking thatĘs undertaken. I know that surface area is a key factor in determining a sustainable population. Perhaps consideration should be given to the effects of biological oxygen demand (BOD) due to the eventual dacay of algae blooms brought on by disturbing silt deposits. I really donĘt know if carp actively prey on newt larvae or if itĘs because there is an insufficient alternative for them to feed on. Tom Lawlor |
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