Following a blog on reintroductions how about one on reintroductions' evil twin - introductions?
There is a general rule in biology that about one in 10 non-native translocated species becomes established in its new home - and that then one in 10 of those becomes an economic or conservation problem. Non-native species are one of the prime causes of species' extinction and so carting species around the globe is generally a bad thing (please note - Richard Branson).
Many of the non-native species in the UK were allegedly brought here by the Romans (eg pheasant, rabbit) but others were deliberately or accidentally released by the landed gentry (eg little owl, grey squirrel, muntjac deer and Canada goose). But then there is a long list of species whose origins are unknown but which are here as a result of careless trade across the globe.
This blog has commented on ring-necked parakeets (here, here, here and here), pheasants (here), muntjac deer (here) and grey squirrels (here, here and here) at various times to illustrate the practical and intellectual issues surrounding this subject.
It seems likely that we will face continuing and growing problems with non-native species becoming established in the UK. One of the latest arrivals is the scary creature the killer shrimp. What havoc might this species cause in our waterways? What happened to the New Zealand flatworm that was going to take over our gardens about 15 years ago?
Prevention is better than cure, and far cheaper, but difficult to police and ensure. I just have a feeling that this is a growing problem that we will all have to live with. It won't kill us - but it might finish off a few more native species if we aren't careful. And experience shows, we won't be careful enough.
“The main problem is that the public do not like birds and mammals to be killed, rats and mice excepted. Witness Ruddy Ducks, and hedgehogs on the Uists. In contrast, destroying the habitats where birds and mammals live (by using biofuels for example) is seen as inevitable progress.”
• Agreed – but you’ve missed out TB in mammals – most people (RSPB members and staff included) do!
“It is difficult to see how a membership organisation like the RSPB can take the lead in calling for the elimination of invasive non-native species (except rats and mice of course) without losing members. That should be left to government agencies.”
• If the RSPB was managed by knowledgeable intelligent scientists instead of …….. then it would be achieving what you suggest – like a political party – the RSPB gets the membership it deserves – and it doesn’t always help the flora and fauna of the UK!
“As for introducing more stuff from mainland Europe because of climate change, have we learnt nothing from past mistakes?
• In my locality Axe Edge Moor is the major moorland west of Buxton in the Peak District - it is mainly gritstone with its highest point (551 metres (1,808 ft)
• The moor is the source of the River Dove, River Manifold, River Dane, River Wye and River Goyt. The moor is shared between the counties of Derbyshire, Staffordshire and Cheshire, which meet on its south-western flank at the Three Shire's Head on the Dane.
• A neighbouring farm’s well has just dried up for the first time in living memory – and other farmers with lots of cattle can’t move them because there is no (naturally available) water. At least this should please those RSPB members that are left-wing vegetarian loonies.
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