Forced convection modulates gas exchange in cnidarians

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Abstract

<jats:p> Boundary layer thickness is a potentially important component of the diffusive pathway for gas exchange in aquatic organisms. The soft coral <jats:italic>Alcyonium siderium</jats:italic> (Octocorallia) and sea anemone <jats:italic>Metridium senile</jats:italic> (Actiniaria) exhibit significant increases in respiration with water flow over a range of Reynolds numbers encountered subtidally. A nondimensional mass transfer analysis of the effect of forced convection demonstrates the importance of the state of the organism's boundary layer in regulating metabolism in these invertebrates. Flow-modulated gas exchange may limit secondary productivity in subtidal environments. </jats:p>

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