Ionic regulation in the Pacific edible crab, Cancer magister (Dana)

1973 ◽  
Vol 51 (7) ◽  
pp. 735-743 ◽  
Author(s):  
F. R. Engelhardt ◽  
P. A. Dehnel
Keyword(s):  
Estuarine Environment ◽  
Ionic Regulation ◽  
Magnesium Ions ◽  
Cancer Magister ◽  
Sodium Potassium ◽  
Seasonal Differences ◽  
The Pacific ◽  
Calcium And Magnesium ◽  
Seasonal Acclimation

Regulation in blood and urine of chloride, sodium, potassium, calcium, and magnesium was determined for the crab, Cancer magister, collected from an estuarine environment and adapted to hypo- and hypersaline conditions. Seasonal differences in regulation were found, demonstrating seasonal acclimation. In all instances except magnesium, ions were regulated hypertonically in dilute media, and summer-adapted animals were the greater regulators. In concentrated media, ions differed with regard to the degree of regulation. Regulation of magnesium is strongly hypotonic. Size was determined not to be a factor in the regulation of ions.

A Simple Procedure for the Study of Ionic Regulation in Small Animals

1955 ◽  
Vol 32 (2) ◽  
pp. 321-329
Author(s):  
J. SHAW
Keyword(s):  
Simple Procedure ◽  
Small Animals ◽  
Ionic Regulation ◽  
Salt Solutions ◽  
Sodium Potassium ◽  
Specific Chemical ◽  
Blood Samples ◽  
Electrometric Method ◽  
Chemical Reagents ◽  
Calcium And Magnesium

A simple procedure is described for the estimation of sodium, potassium, calcium and magnesium in quantities of about 1 µg. The ions are precipitated by specific chemical reagents, the precipitates separated by centrifugation and converted quantitatively into chlorides. The chloride is titrated by the Volhard method or by an electrometric method using a simple automatic micro-burette. Measurements made on simple salt solutions and on blood samples gave standard deviations of 1-2% except in the sodium method where the error was greater (2-4%).

scholarly journals Seasonal variation of some major ions in a tropical lagoon waters, Aby lagoon (Côte d’Ivoire): Relationship with temperature, salinity and pH

2021 ◽  
Vol 14 (9) ◽  
pp. 3391-3399
Author(s):  
Sylvie Assemian-Niango ◽  
Kouakou Gains Kpan Kpan ◽  
Natchia Aka
Keyword(s):  
Major Ions ◽  
Absorption Spectrometry ◽  
Anthropogenic Influence ◽  
Sodium Potassium ◽  
Seasonal Differences ◽  
Standard Methods ◽  
Tropical Lagoon ◽  
Nephelometric Method ◽  
Calcium And Magnesium

In response to continental inputs, the aim of this study was to know some major ions contents in Aby lagoon waters, according to seasons and in relation to temperature, salinity and pH. To do this, concentrations of major ions such as (sodium (Na +), potassium (K +), calcium (Ca2+), magnesium (Mg2+) and sulphates (SO42-) of Aby lagoon waters are determined, according to seasons and in relation to temperature, salinity and pH. From September 2007 to July 2009, during monthly sampling campaigns, temperature, salinity and pH of lagoon’s waters were measured, in situ, at twenty (20) stations distributed along lagoon. Water samples were taken at these stations, at the depth of 0.2 m below the surface, to determine in laboratory, concentrations of major ions using standard methods (Atomic Absorption Spectrometry methods for sodium, potassium, calcium and magnesium and Nephelometric method for sulphates). Seasonal variations of sodium, potassium and calcium concentrations are proportional to temperature, salinity and pH. These ions are under influence of oceanic waters inputs. In contrast, magnesium and sulphates are under anthropogenic influence, these concentrations are not proportional to temperature, salinity and pH. There are significant seasonal differences between major ions concentrations of waters from one season to another. Aby lagoon is under strong anthropogenic influence.

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