LectGasExchange2 - Aquatic Gas Exchange water breathers...

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Aquatic Gas Exchange nudibranch “water breathers”
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Diversity of Gas Exchangers Diversity of Gas Exchangers • integument • gills • mouth • pharyngeal air sacs • swim bladder (lung) •cloaca • gut • operculum main routes
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Air-filled space Synbranchus South American swamp eel bimodal: facultative air breather
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Hoplosternum
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• Integument of probably all water breathers is permeable to gases, except for calcified structures. (integument = “skin”) Integument has multiple functions; thinning is not always possible Thicker skin suffices for gas exchange, if it is vascular
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M x = K x •A• Δ P x /d skin properties “effective” skin area ventilation or convection of skin skin thickness Skin as example of gas exchange
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Telmatobius , Lake Titicaca frog
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Epidermal thickness, μ m Anguilla anguilla , eel 263 Misgurnus fossilis , pond loach 339 Can supply nearly total oxygen demand through skin. Compare with lung and gill where d < 0.5
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LectGasExchange2 - Aquatic Gas Exchange water breathers...

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