I don't know about the overlapping areas of F. olivaceus and
notatus.......the notatus don't occur here in my normal collecting
ranges..........
BG
----- Original Message -----
From: unclescott <unclescott_at_prodigy.net>
To: <nanfa_at_aquaria.net>
Sent: Tuesday, October 28, 2003 6:06 PM
Subject: Re: NANFA-- RE: WWMD & Fundulus
> Thank you B.G.,
>
> A pretty reliable and frequently consulted resource has described F.
> olivaceus and F. euryzonus as behaving pretty much the same - cruising the
> surface. It figured that they would have somewhat different (micro?)
> habitats.
>
> Now.... distribution maps show a considerable overlap between F. olivaceus
> and F. notatus. What you have described for olivaceus, where they sail
> zig-zag across surface waters in a small flotilla, dappled by the sun,
seems
> like a lot like how we observed notatus in a couple of local streams at
the
> other end of the Mississippi Valley, here.
>
> What happens when they occur in the same areas?
>
> My apologies to you and probably many others on the list. This is probably
a
> frequently trod trail.
>
> Thanks and all the best,
>
> (just) Scott
>
> (57 degrees F in the Kankakee a week ago, it's been a lot cooler since
> then.)
> ...............
> > Yes, to both of your questions! The fish are found in the same
drainages,
> but have distinct differences in habitat preferences!
> >
> > F. olivaceus are usually found in the shallows, preferably sunlit areas,
> while F. euryzonus prefer the deeper, shaded areas of the same
creek/river!
>
> > Maybe that this is how they maintain their purity of races, as it
> were..........But, in a controlled environment, it has been shown by an
LSU
> graduate (Thomas Blanchard, in his thesis paper) that they can and will
> hybridize....
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