ISSN:
1432-136X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary 1. Water fluxes (as3H2O) across the permeable (gill) integument have been measured in the freshwater amphipod (Corophium curvispinum. These data have been related to rates of drinking and urine production. The latter were measured using51CrEDTA as a marker. 2. The structure of the antennary organs (paired renal organs) are described. 3. The gills have a high permeability to H2O (Pd=3.0·10−6 m s−1) and, to effect volume regulation, the urine flow rate (∼61 μl g−1 h−1) is greater than in other freshwater crustaceans. The coelomosac of each antennary organ filters 170 times its own fluid volume per hour. This rapid turnover of body water may reflect a recent brackish-water ancestry. 4. The coiled efferent tubule of the antennary organ is more elongate than in related species and shows differences in ultrastructure suggesting a greater capacity for Na+ reabsorption. Little water withdrawal from the urine appears to occur.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01101095
