QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by RIEGEL, J. A. Articles by TAYLOR, P. A. Search for Related Content PubMed Articles by RIEGEL, J. A. Articles by TAYLOR, P. A.

Journal of Experimental Biology 60,167-181 (1974)
Published by Company of Biologists 1974

Urinary Bladder Volume and the Reabsorption of Water from the Urine of Crabs

J. A. RIEGEL ¹, A. P. M. LOCKWOOD ², J. R. W. NORFOLK ², N. C. BULLEID ², and P. A. TAYLOR ²

¹ Department of Zoology, Westfield College, University of London
² Department of Oceanography, University of Southampton

1. Measurements have been made to determine the blood volume, bladder volume, clearance of ¹³¹I-sodium diatrizoate and U/H for diatrizoate in the crabs Carcinus maenas and Macropipus (Portunus) depurator.

2. Observed values of clearance blood volume and bladder volume in the two species at 18 °C were: Clearance (as % blood volume per day), Macropipus 56.1±14.5; Carcinus 27.1±5.8; Blood volume (as % body weight), Macropipus 21.0±4.0; Carcinus 19.2±3.0; Bladder volume (as % blood volume), Macropipus 12.1 ±5.0; Carcinus 11.0±8.0.

3. It is shown that the measured U/H differs from that to be expected if no reabsorption of water or secretion of diatrizoate occurs.

4. ¹⁴C-inulin and ⁵¹Cr-EDTA are excreted in an essentially similar manner to ¹³¹I-diatrizoate by Carcinus, implying that any active secretion of diatrizoate must be small in magnitude.

5. Injections of ethacrynic acid decrease the U/H ratio for diatrizoate relative to that in control Carcinus injected with sea water. In some Carcinus the concentration of diatrizoate in the urine comes to exceed that initially present in the blood. Both these points are taken, with 3, as support for the conclusion that water can be withdrawn from the primary urine of Carcinus.