Muddy waters: the influence of high suspended-sediment concentration on the diving behaviour of a bimodally respiring freshwater turtle from north-eastern Australia
Jason R. Schaffer A C , Mark Hamann B , Richard Rowe B and Damien W. Burrows A
+ Author Affiliations
- Author Affiliations
A TropWATER, James Cook University, Townsville, Queensland, Australia.
B College of Marine and Environmental Sciences, James Cook University, Australia.
C Corresponding author. Email: Jason.Schaffer1@jcu.edu.au
Marine and Freshwater Research 67(4) 505-512 https://doi.org/10.1071/MF14117
Submitted: 29 April 2014 Accepted: 23 February 2015 Published: 23 July 2015
Abstract
Increased suspended-sediment concentrations (SS) in rivers can affect aquatic respiration in riverine fauna by impairing respiratory function. Bimodally respiring freshwater turtles are likely to be sensitive to changes in SS because increased concentrations may affect their ability to aquatically respire. However, the impact of SS on the diving behaviour of bimodally respiring freshwater turtles has not been formally investigated. To test this, we examined the influence of dissolved oxygen (DO) saturation (25%, 100%) and temperature (17°C, 25°C) on the diving behaviour of Elseya irwini under clear (0 mg L–1) and turbid (79 mg L–1) conditions. We hypothesised that low temperature and high DO % saturation would increase dive duration and that high SS would negate the effect of DO, decreasing dive duration under highly oxygenated conditions. Our data demonstrated that increased SS significantly reduced mean dive duration by 73% (97.4 ± 10.1 min in 0 mg L–1 trials v. 26.4 ± 3.2 min in 79 mg L–1 trials) under conditions of low temperature (17°C) and high DO % saturation (100%) only. Increased SS directly affects the utilisation of DO by this species, so as to extend submergence times (aquatic respiration) under optimal conditions, raising concerns about the effect of SS on the persistence of populations of physiologically specialised freshwater turtles.
Additional keywords: aquatic respiration, dive duration, Elseya, turbidity.
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