Christopher A. Ryen

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The wrasses Halichoeres margaritaceus (Fig. 1a) and Halichoeres miniatus (Fig. 1b) (family Labridae) are monandric protogynous hermaphrodites, where males are derived from females through post-maturational sex change. Under stable social conditions the male of each species guards several intraspecific females and mates exclusively with those females daily.(More)
In protogynous sex-changing fishes, females are expected to compete for the opportunity to change sex following the loss of a dominant male and may exhibit growth and behavioural traits that help them maintain their dominant status after sex change. A male removal experiment was used to examine changes in female growth and behaviour associated with sex(More)
Variability in the density of groups within a patchy environment lead to differences in interaction rates, growth dynamics and social organization. In protogynous hermaphrodites there are hypothesised trade-offs among sex-specific growth, reproductive output and mortality. When differences in density lead to changes to social organization the link between(More)
We report the case of a 23 year-old obese female, with previously diagnosed situs inversus below the diaphragm, who presented with severe left upper quadrant abdominal pain. The patient was believed to have a surgical indication, possibly appendicitis or diverticulitis, and had an emergent abdominal Computed Tomography (CT) scan. The CT was interpreted as(More)
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