There are actually a lot of interesting notes like this, and yes I agree it is
important to also consider other aquatic critters too. It is also important
to consider that not all aquatic critters have the same ecological factors
that effect their disperal abilities. Another problem is the data just aren't
available yet for most critters. Turtles have only recently been getting a
lot of work done on them, and the same goes for fishes. The crustacean groups
are starting to get some attention, but there is a long ways to go. But it
will make a great story when not only a variety of species, but a variety of
groups can be compared.
> Just think Peter you might be a grumpy old man before you have finished :-)
Well, I have plenty of examples to follow in that realm don't I Adrian! :-)
Cheers
Peter