Good points, Bruce. I wonder then if the primary mode of escape of
harmful exotics is deliberate release of the animals by people. I
guess not with round gobies and zebra mussels as far as we know.
Aside from those limited habitats of the southwest, which were very
fragile to begin with, I also wonder to what extent the problems in
California are primarily the result of habitat degradation by humans
rather than competition from aggressive exotics like LMB, green
sunnies and bluegill.
-- Mark Ohio USA <))>< /----------------------------------------------------------------------------- /"Unless stated otherwise, comments made on this list do not necessarily / reflect the beliefs or goals of the North American Native Fishes / Association" / This is the discussion list of the North American Native Fishes Association / nanfa-in-aquaria.net. To subscribe, unsubscribe, or get help, send the word / subscribe, unsubscribe, or help in the body (not subject) of an email to / nanfa-request-in-aquaria.net. For a digest version, send the command to / nanfa-digest-request-in-aquaria.net instead. / For more information about NANFA, visit our web page, http://www.nanfa.org