|SREL Reprint #0742|
Digestive Turnover Rates in Freshwater Turtles: The Influence of Temperature and Body Size
The digestive turnover times (ingestion to
defecation) of five species of North American freshwater turtles were examined
in the laboratory.
Pond sliders (Pseudemys s. scripta)
and painted turtles (Chrysemys picta) exhibited similar digestive
turnover times (61 and 59 hr, respectively) at 25°C.
Snapping turtles (Chelydra serpentina)
had a significantly faster turnover time (31 hr) at 25°C,
which was considered to be an adaptation for living in a cool, benthic habitat.
Single specimens of a loggerhead musk turtle (Sternotherus
minor) and stinkpot turtle (Sternotherus odoratus) had
turnover times of 57 and 49 hr, respectively.
Digestive turnover times were inversely correlated
with temperature in C. picta between 16 and 34°C
(Y= -3.33X + 131.53, r2=0.76).
Body size and digestive turnover times in P. scripta
were not correlated at 25°C.
SREL Reprint #0742
Parmenter, R.R. 1981. Digestive turnover rates in
freshwater turtles: the influence of temperature and body size.
Comparative Biochemistry and Physiology 70A:235-238.