Euglandina snails all over the Pacific; big-mouth bass in Lake Biwa in
Japan; American gray squirrels in the UK - there are plenty of things that
have gone the other direction.

These were on purpose as with Musk rat, mink, Coypu, Reeves's pheasant, Sika
deer, Quail, Mosquito fish(es), carp, Chukar partridge, budgers, swine,
cats, dogs etc. Many pests also crossed through reverse direction (maize
pyral and potato beetle). These are somewhat understandible in case they are
under control (in a gane reserve or farm), which almost never happens.

I want to add most interesting o all interesting introduction case i've
heard of. During World war II two species to a NA money spider (Linyphiidae)
genus brought to environs of Berlin during airraids!

I consider knowledge of the 'mode of introduction' is important. If we know
how they come, we may conclude origin and possible future range, thus areas
in danger.

----- Original Message -----
From: "Paul Callomon" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, November 29, 2004 3:12 PM
Subject: Re: Exotic landsnail in North America


> Tom et al,
>
> Paul Callomon
> Collections Manager
> Malacology, Invertebrate Paleontology and General Invertebrates
> Department of Malacology
> Academy of Natural Sciences
> 1900 Parkway, Philadelphia PA 19103-1195, USA
> Tel 215-405-5096
> Fax 215-299-1170
> Secretary, American Malacological Society
> On the web at http://erato.acnatsci.org/ams/
>
>
> >>> [log in to unmask] 11/29/04 08:06AM >>>
> Some plants and animals were brought over as food items: common carp,
> various helicids, Corbicula. Some were introduced for reasons that defy
> logic, like the starling. Relatively few species have gone the other
direction.
>
> Euglandina snails all over the Pacific; big-mouth bass in Lake Biwa in
Japan; American gray squirrels in the UK - there are plenty of things that
have gone the other direction.
>
> PC.
>
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