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First published online January 19, 2006
Journal of Experimental Biology 209, 475-483 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02035
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Heterogeneous perfusion of the paired gills of the abalone Haliotis iris Martyn 1784: an unusual mechanism for respiratory control

Norman L. C. Ragg* and H. Harry Taylor

School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand


Figure 1
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  		Fig. 1. (A) Transverse section of the right efferent ctenidial vein of Haliotis iris filled with amaranth-stained gelatin. Haemocoelic spaces (haem.) and `lymphoid' tissue (lymph.) are marked, along with the depth (D) and width (W) dimensions. (B) Velocity flow profile with respect to probe depth range from a representative animal, showing a parabolic distribution. Points are mean flow velocities expressed as a fraction of the peak measured velocity.

 

Figure 2
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  		Fig. 2. Live mass-standardised haemolymph flow rates leaving the left and right gills of stressed, recovering and resting Haliotis iris. Values are means ± s.e.m.

 

Figure 3
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  		Fig. 3. Mean oxygen partial pressure (PO2) measured in the post-branchial haemolymph of the left and right gills of stressed, recovering and resting Haliotis iris. Values are means ± s.e.m.

 

Figure 4
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  		Fig. 4. Estimated oxygen content of post-branchial haemolymph leaving the left and right gills of Haliotis iris during conditions of stress, recovery and at rest. Values are means ± s.e.m.

 

Figure 5
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  		Fig. 5. Record showing the effect of clamping to the substratum on heart rate and post-branchial haemolymph flow in Haliotis iris. The shaded region represents a period of sustained spontaneous clamping.

 

Figure 6
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  		Fig. 6. Record showing the effect of twisting on heart rate and post-branchial haemolymph flow in Haliotis iris. The shaded regions represent bouts of spontaneous twisting activity.

 

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© The Company of Biologists Ltd 2006