North American Recent Soft-Shelled Turtles (Family Trionychidae) — John Shaqi
North American Recent Soft-Shelled Turtles (Family Trionychidae)Webb, Robert G. (Robert Gravem)
Science
North American Recent Soft-Shelled Turtles (Family Trionychidae)
Webb, Robert G. (Robert Gravem)
Soft-shelled turtles
Individuals of _muticus_ and _spinifer_ frequently bury themselves in
sand in shallow water and can be collected by hand by noting swirls or
disturbances on the bottom caused by a turtle withdrawing its head
(Conant, 1951:156, 159). Professional turtle collectors take them by
"noodeling" (Conant, _op. cit._:160); Lagler (1943a:22) elaborated on
the method of "noodling." P. W. Smith (1947:39) remarked that 20 or more
softshells were taken "within a few hours by probing sand bars at the
water edge" near Charleston, Illinois. From a distance I observed an
individual of _T. s. asper_ bury itself in shallow water on the Escambia
River, Florida. Small individuals of _muticus_ have been taken by hand
along the shore of Lake Texoma. Along the Flint River near Bainbridge,
Georgia, two hatchlings that were buried in sand in shallow water
emerged at my approach and scurried a few inches, then buried themselves
again. Larger turtles seem to be more wary. One that was disturbed,
emerged from the sand and swam toward deep water.
In clear water, water-goggling may be effective in securing softshells.
Marchand (_in_ Carr, 1952:417-18) mentioned that softshells (_ferox_)
can be found buried in deep water with only the heads visible; the
turtles are not easily frightened under water and may be captured by
grasping their necks. A similar technique described by Allen and Neill
(1950:3) resulted in the capture of trionychid turtles. In clear water
of the White River, Arkansas, I collected a few softshells by hand as
they lay on the bottom.
In shallow-water areas of large rivers, lakes and tributaries, seining
often procures softshells. Methods used in fisheries investigations such
as the application of rotenone and electric shockers, and even
dynamiting, sometimes yield soft-shelled turtles. Carr (1952:419) wrote
that numbers of _ferox_ were incapacitated by rotenone in Florida lakes,
although no other species of turtle was affected. I captured a snapping
turtle (_Chelydra serpentina_) that was immobilized by the current from
an electric shocker in a small, alga-choked tributary of Cache Creek,
Comanche County, Oklahoma; presumably turtles must come in close contact
with the electrodes to be affected (see discussion by Gunning and Lewis,
1957:52).
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