The water is lower today than last month, by about a foot, and we broke out
the 20-foot seine rather than the 6-foot seine. We found distinct zonation
between these three species: the blacktails, a large Cyprinella species,
were only found in deeper pools that we seined; some silverstripes would be
in these pools, but the silverstripes were concentrated in the remaining
riffles in low water, about mid-calf deep; and a few burrheads were found in
the riffles, but most were found in shallow flowing pools just above riffles
along with a few silverstripes and no blacktails.
It struck me as a nice, fairly simple example of the partitioning of
available environment between similar species so that they don't directly
compete with each other as much.
The various darters are now going out of breeding coloration. The
Tuskaloosas only have some turquoise blue on the underside, and the Warriors
have pronounced red dots down the side.
--Bruce Stallsmith
Huntsville, AL, US of A
/-----------------------------------------------------------------------------
/"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