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 STADDON, B. W. Search for Related Content PubMed Articles by STADDON, B. W.

Journal of Experimental Biology 51,659-669 (1969)
Published by Company of Biologists 1969

Water Balance In Ilyocoris Cimicoides (L.) (Heteroptera; Naucoridae): The Maximum Osmotic Concentration Of The Rectal Fluid

B. W. STADDON ¹

¹ Department of Zoology, University College of South Wales and Monmouthshire, Cardiff

1. Evidence has been obtained that the excretory system of Ilyocoris cimicoides (L.) is incapable of separating a fluid that is osmotically more concentrated than the haemolymph, that the osmotic concentration of the rectal fluid, relative to that of the haemolymph, attains maximum values only after feeding, and that the osmotic concentration of the rectal fluid has reached a maximum under fasting conditions when it is about two-thirds of that of the haemolymph.

2. In the absence of liquid water there was a rise in the osmotic concentration of the rectal fluid and a rise in that of the haemolymph. However, the former remained significantly less than the latter, a possible explanation being that no significant movement of water takes place across the rectal epithelium.