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Thermal conductivity of sand and its effect on the temperature of Loggerhead Sea Turtle (Caretta Caretta) nests

Speakman, J.R., Hays, G.C. and Lindblad, E. 1998, Thermal conductivity of sand and its effect on the temperature of Loggerhead Sea Turtle (Caretta Caretta) nests, Journal of the Marine Biological Association of the United Kingdom, vol. 78, no. 4, pp. 1337-1352.

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Title Thermal conductivity of sand and its effect on the temperature of Loggerhead Sea Turtle (Caretta Caretta) nests
Author(s) Speakman, J.R.
Hays, G.C.
Lindblad, E.
Journal name Journal of the Marine Biological Association of the United Kingdom
Volume number 78
Issue number 4
Start page 1337
End page 1352
Total pages 16
Publisher Cambridge University Press
Place of publication Cambridge, England
Publication date 1998-11
ISSN 0025-3154
1469-7769
Summary The conductivity of sand at a depth of 30–50 cm was measured at 15 sites on the beach at Captiva Island in south-west Florida which is used by nesting loggerhead turtles (Caretta caretta). The mean daily temperature of the sand was correlated with conductivity at the same depth measured the same day (r=0·611). When day to day variation was removed the correlation between nest temperature and conductivity increased to 0·694. The sand was highly variable in its grain structure. The dominant variability (80·6%) was redescribed by the first two principal components of a Principal Components Analysis (PCA). These two components were influenced mostly by percentages of large (> 1 mm) and small (< 500 μm) grains respectively. Conductivity was strongly correlated with the grain structure of the sand. The first three principal components describing sand grain structure, explained 84·1% of the variation in conductivity. Moisture content of the sand (always < 5%) was not an important factor. Sites dominated by larger grains generally had poorer conductivity and were cooler. Comparisons of eight nests to seven adjacent random sites revealed no strong evidence for directional selection in nest placement relative to sand conductivity. The variance in conductivities recorded at nests was also not significantly different from the variance at random sites.
Language eng
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1998, Cambridge University Press
Persistent URL http://hdl.handle.net/10536/DRO/DU:30058269

Document type: Journal Article
Collections: School of Life and Environmental Sciences
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