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Fig. 2. 3-Hydroxyacyl CoA dehydrogenase (HOAD) activities (mean ± s.e.m.) in
liver and extrahepatic tissues of freshwater, euryhaline and marine
elasmobranchs with varying levels of urea: Potamotrygon motoro
(freshwater) (no urea), Himantura signifer in freshwater (low urea),
H. signifer acclimated to half-strength seawater (
Seawater)
(increased urea), Taeniura lymma (marine) (high urea) and
Chiloscyllium punctatum (marine) (high urea). See text or
Fig. 4 for specific urea
levels. Sample sizes and the results of statistical comparisons between
tissues and species are given in Tables
1 and
2. The salinity (and thus urea
level) for each species or acclimation group is indicated by the shading of
the bars. Enzyme measurements were made at 25°C. ND, not detectable.
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