Seasonal changes in the diel surfacing behaviour of the bimodally respiring turtle Rheodytes leukops

Gordos, Matthew A., Franklin, Craig E. and Limpus, Colin J. (2003) Seasonal changes in the diel surfacing behaviour of the bimodally respiring turtle Rheodytes leukops. Canadian Journal of Zoology, 81 9: 1614-1622. doi:10.1139/Z03-153


Author Gordos, Matthew A.
Franklin, Craig E.
Limpus, Colin J.
Title Seasonal changes in the diel surfacing behaviour of the bimodally respiring turtle Rheodytes leukops
Journal name Canadian Journal of Zoology   Check publisher's open access policy
ISSN 0008-4301
Publication date 2003-09-01
Sub-type Article (original research)
DOI 10.1139/Z03-153
Volume 81
Issue 9
Start page 1614
End page 1622
Total pages 9
Place of publication Ottawa
Publisher Natoinal Research Council of Canada
Collection year 2003
Language eng
Subject C1
270700 Ecology and Evolution
780105 Biological sciences
0608 Zoology
Abstract The purpose of this study was to determine whether a relationship existed between the diel surfacing trends of the bimodally respiring freshwater turtle Rheodytes leukops and daily fluctuations in specific biotic and abiotic factors: The, diel surfacing behaviour of adult R. leukops was recorded over four consecutive seasons (Austral autumn 2000 - summer 2001) within Marlborough Creek, central Queensland, Australia, using pressure-sensitive time-depth recorders. Additionally, diurnal variations in water temperature and aquatic Po-2 level, as well as the turtle's behavioural state (i.e., active versus resting), were monitored. In autumn and summer, surfacing frequency increased significantly during the daylight hours, with peak levels normally occurring around dawn (0500-0700) and. dusk (1700-1900). However, no consistent diel surfacing trend was recorded, for the turtles in winter or spring, owing to considerable variation among individual R. leukops. Diurnal surfacing trends recorded for R. leukops in, autumn and summer are attributed to periods of increased activity (possibly associated with foraging) during the daylight hours and not to daily variations in water temperature or aquatic Po-2 level. Turtles generally remained at a depth greater than 1 m throughout the day, where the effect of diel fluctuations in water temperature, (<0.5 &DEG;C) and aquatic Po-2 level (<15 mm Hg (1 mm Hg = 133.322 Pa)) was considered to be negligible.
Keyword Zoology
Fresh-water Turtles
Acid-base Status
Macquarii Gray Testudines
Chrysemys-picta-bellii
Aquatic Oxygen-uptake
Emydura-macquarii
Diving Behavior
Chelydra-serpentina
Pseudemys-scripta
Snapping Turtles
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 12:11:28 EST