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Respiratory and osmoregulatory physiology of a meiobenthic marine gastrotrich, Turbanella ocellata Hummon 1974
Hummon, W.D. (1975). Respiratory and osmoregulatory physiology of a meiobenthic marine gastrotrich, Turbanella ocellata Hummon 1974. Cah. Biol. Mar. 16(2): 255-268
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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    Marine

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  • Hummon, W.D.

Abstract
    Respirometry measurements show that the adult macrodasyid gastrotric Turbanella ocellata uses 4 to 8.5 nl O2/animal hr (5.7 to 12 nl O2/{mu}g dry wt hr) at 14 to 27°C, 32 P.1000. These values are higher than comparable values for most other marine meiobentich animals. Oxygen consumption decreased with greater or lesser salinities than those to which animals were acclimatized. Incipient somatic lethal limits over 24 hr exceed 10 to 60 p.1000 over than the range of seasonal ambient water temps, 14 to 27°C. Both temp and salinity adjustment to changes thermal conditions are demonstrated for this eurytopic sp. T. ocellata is a volume osmotic regulator. Rapidly increasing or decreasing body volume is in response to anisosmotic salinity gradients between internal and external fluids. This is followed by a gradual return of body volume to normal, presumably by means of isosmotic solute-solvent flux. Logn rates of net flux are 15 to 50x 10-6 {mu}m3 osm sec for simple anisonsmotic changes from seawater and l to 1.5 for subsequent isosmotic adjustment. Evidence is presented that net inward flux under hypoosmotic conditions is a resultant of three separate fluxes: passive outward solute flux, active outward solute flux and passive inward solvent flux.

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