Rate Of Spread Of Invasive Species

[gamerooster 1,179]

We all know how well grey squirrels and mink have spread, but why do you think other species don't spread so quick? Zander and wels for example? Apparently one of the worst invasive species on the planet is American bullfrogs, they had a couple of pockets which the environment aGennys wiped out easily.... any thoughts?

[Born Hunter 17,780]

Would the fish species not generally be dependent on Man spreading them to isolated water systems? They have these natural barriers unlike the mammalian species you mention. If there is no great desire by Man to continue the spreading then they'll remain localised within their current water systems would be my guess.

 

An interesting one is Chinese Water Deer, they're not restricted by any physical barriers like fish but seem to be fairly localised and not spreading to the same degree other deer species do.

 

Similar topic but I find it interesting why Roe heavily populate Northern and Southern Britain but are relatively rare in large part of the Midlands. Something I've put down to a general lack of woodland and farming interests. But maybe not?

 

Another peculiarity someone on here mentioned a while back is why hooded and carrion crows have separate geographical territories as a species with a contact zone that barely moves? Given they are basically identical species with only really a minor difference in appearance why then don't they inhabit the same areas?

[scottish lurcher 185]

For a moment I thought this was going to be thread on Eastern Europeans migrantants coming to the uk ??

[gamerooster 1,179]

I've always thought the same thing born hunter, some animals seem to only want to stay in isolated pockets even though they've nothing stopping them sprending, funnily enough it's only recently grey squirrels have come to my area, and within a year or two I've been getting good numbers in the traps

[C556 351]

I'm starting to see Japanese Knotweed more often on the edge of towns, as well as Giant Hogweed.

[Hydropotesinermis 724]

Would the fish species not generally be dependent on Man spreading them to isolated water systems? They have these natural barriers unlike the mammalian species you mention. If there is no great desire by Man to continue the spreading then they'll remain localised within their current water systems would be my guess.

 

An interesting one is Chinese Water Deer, they're not restricted by any physical barriers like fish but seem to be fairly localised and not spreading to the same degree other deer species do.

 

Similar topic but I find it interesting why Roe heavily populate Northern and Southern Britain but are relatively rare in large part of the Midlands. Something I've put down to a general lack of woodland and farming interests. But maybe not?

 

Another peculiarity someone on here mentioned a while back is why hooded and carrion crows have separate geographical territories as a species with a contact zone that barely moves? Given they are basically identical species with only really a minor difference in appearance why then don't they inhabit the same areas?

There has to be a habitat, climate or food issue that haults an animals spread.

 

Chinese water deer suffer high fawn mortality rates and prefer arable farmland or phragmites reed beds etc, i woukd say that a mixture of unsuitable habitat and food has slowed their spread exacerbated by their fawn mortality rates.

 

I would suggest you are right for Roe. They are selective browsers so maybe again in the Midlands what ground there is is perhaps lacking suitable browse.

Edited November 2, 2016 by Hydropotesinermis

[gamerooster 1,179]

If cwd like wetland than where's better for that then up north, though the weather isn't as kind up here which may be a deciding factor.

I just always find it mad to believe that grey squirrels for example started off the population over here with so few animals! As for large animals, the only one I see spreading successfully is wild bkar, though we don't have any in Cumbria. ....yet!

[DogFox123 1,379]

Would the fish species not generally be dependent on Man spreading them to isolated water systems? They have these natural barriers unlike the mammalian species you mention. If there is no great desire by Man to continue the spreading then they'll remain localised within their current water systems would be my guess.

 

An interesting one is Chinese Water Deer, they're not restricted by any physical barriers like fish but seem to be fairly localised and not spreading to the same degree other deer species do.

 

Similar topic but I find it interesting why Roe heavily populate Northern and Southern Britain but are relatively rare in large part of the Midlands. Something I've put down to a general lack of woodland and farming interests. But maybe not?

 

Another peculiarity someone on here mentioned a while back is why hooded and carrion crows have separate geographical territories as a species with a contact zone that barely moves? Given they are basically identical species with only really a minor difference in appearance why then don't they inhabit the same areas?

Maybe because the Chinese Water Deer haven't been released on a large scale in other areas like they have in Cambridgeshire and Norfolk?

[forest of dean redneck 11,643]

What about Magpies,they are non native . There's nice little micro climate here for CWD .woodland with arable and clumps of rushes in between.

[gamerooster 1,179]

Rats and rabbit's are also introduced let's not forget, and I'd go as far as saying no other wild animal has shaped our history as much as these two..... I see texas is having a major problem with wild hogs, could that possiblyth happen here with boar?

[Born Hunter 17,780]

 

Would the fish species not generally be dependent on Man spreading them to isolated water systems? They have these natural barriers unlike the mammalian species you mention. If there is no great desire by Man to continue the spreading then they'll remain localised within their current water systems would be my guess.

 

An interesting one is Chinese Water Deer, they're not restricted by any physical barriers like fish but seem to be fairly localised and not spreading to the same degree other deer species do.

 

Similar topic but I find it interesting why Roe heavily populate Northern and Southern Britain but are relatively rare in large part of the Midlands. Something I've put down to a general lack of woodland and farming interests. But maybe not?

 

Another peculiarity someone on here mentioned a while back is why hooded and carrion crows have separate geographical territories as a species with a contact zone that barely moves? Given they are basically identical species with only really a minor difference in appearance why then don't they inhabit the same areas?

There has to be a habitat, climate or food issue that haults an animals spread.

 

Chinese water deer suffer high fawn mortality rates and prefer arable farmland or phragmites reed beds etc, i woukd say that a mixture of unsuitable habitat and food has slowed their spread exacerbated by their fawn mortality rates.

 

I would suggest you are right for Roe. They are selective browsers so maybe again in the Midlands what ground there is is perhaps lacking suitable browse.

 

 

I believe the Roe one is habitat simply because the Roe that are here seem to generally be in cracking health. They don't struggle to rear two fawns to maturity and always look big, fat and muscled for their age. Obviously the Midlands differs from Fens to Wolds to Dales but it's not like their's a shortage of prime fodder for them, certainly enough to support a much larger population. The only thing I can put it down to really is a lack of extensive woodland to make them feel secure....

 

Or possibly they were smashed decades ago for the sake of the areas farming interests and still haven't quite recovered?

[forest of dean redneck 11,643]

Rats and rabbit's are also introduced let's not forget, and I'd go as far as saying no other wild animal has shaped our history as much as these two..... I see texas is having a major problem with wild hogs, could that possiblyth happen here with boar?

I think Germany has a problem with boar coming into suburbs and trashing the landscape, forest of Dean is starting to, vehicle write offs from collisions, accidents where they flick the turf out onto road edges, green areas and gardens rooted up. Dogs injured.bins overturned.

[Born Hunter 17,780]

 

Rats and rabbit's are also introduced let's not forget, and I'd go as far as saying no other wild animal has shaped our history as much as these two..... I see texas is having a major problem with wild hogs, could that possiblyth happen here with boar?

I think Germany has a problem with boar coming into suburbs and trashing the landscape, forest of Dean is starting to, vehicle write offs from collisions, accidents where they flick the turf out onto road edges, green areas and gardens rooted up. Dogs injured.bins overturned.

 

 

I'm sure I read a report that said there is an estimated boar population of 9000 in Berlin City! LOL

[gamerooster 1,179]

 

Rats and rabbit's are also introduced let's not forget, and I'd go as far as saying no other wild animal has shaped our history as much as these two..... I see texas is having a major problem with wild hogs, could that possiblyth happen here with boar?

I think Germany has a problem with boar coming into suburbs and trashing the landscape, forest of Dean is starting to, vehicle write offs from collisions, accidents where they flick the turf out onto road edges, green areas and gardens rooted up. Dogs injured.bins overturned.

Was reading the forestry commissions annual count up, in 2014 there was 800, in 2015 there was 1000 and 2016 there was 1500, any animal that can 50% increase its number in a year is set to take over

[jonnie bravo 572]

Surprised no one has mentioned crayfish...