Comparative Aerial Metabolism and Water Relations of the Intertidal LimpetsPatella granularisL. (Mollusca: Prosobranchia) andSiphonaria oculusKr. (Mollusca: Pulmonata)

When exposed to air, the phylogenetically distant intertidal limpets Patella granularis (Prosobranchia) and Siphonaria oculus (Pulmonata) displayed diferent levels of survival and metabolic adjustment. Siphonaria oculus lost water at a significantly higher rate, a response probably relating to its less domed shell Despite this, lethal exposure time and lethal water loss ($LT_{50} = 158 h$; $LD_{50} = 59\%$) were considerably higher than for P. granularis ($LT_{50} = 89 h$; $LD_{50} = 34\%$). Oxygen uptake rates (\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage{wasysym} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document}${\mathrm{\dot{V}_{O_{2}}}}$\end{document}) for both species remained constant over 12 h in air of 100% relative humidity (RH), when water loss was presumably negligible,...