| one publication added to basket [16967] | Chemical composition of the small coastal lagoons of the Mediterranean Spanish littoral
López, M.P.; Tomàs, X. (1989). Chemical composition of the small coastal lagoons of the Mediterranean Spanish littoral, in: Ros, J.D. (Ed.) Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3): pp. 591-599
In: Ros, J.D. (Ed.) (1989). Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3). Instituto de Ciencias del Mar: Barcelona. 145-754 pp., more
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, more
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Document type: Conference paper
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| Abstract |
About sixty small water bodies (coastal lagoons,marshes, salt pans, channels, springs, etc.) of the Spanish Mediterranean coast were sampled seasonally for one year (1979-1980), in order to study different aspects of their chemical composition. The concentrations of major ions (alkalinity, Cl-, SO42-, Ca2+, Mg2+, Na+, and K+), nutrients (N.NO3-, N.NO2-, TRP and Si), oxygen and pH were determined for this purpose. The salt concentrations measured range between 0.4 and 361.3 g l-1. The samples have been divided into four classes of salinity (in g l-1): C1, S<5; C2, 5< S<18; C3, 18< S<40; C4, S >40. Within these classes, the pattern of ionic dominance recorded is remarkably constant and similar to that found in most coastal lagoons (CI- SO42- Alk., for the anions, and Na+ Mi+ > Ca2+ K+, for the cations), although other models occur especially in the first class. The dominance of Na+ and Cl-, as well as the molar ratios Mg2+/Ca2+ and Cl-/SO42- clearly increase from class C1 to class C4, The hyperhaline waters include different subtypes of the major brine type «c» of Eugster & Hardie (1978). the Na+ -(Mg2+) -Cl- -(SO42-) being the most frequent. Nutrient concentrations fall within a wide range (N.NO3- from 0.1 to 1100 ug-at l-1; PRT from 0.01 to 23.56ug-at l-1 and Si from 1.0 to 502.0 ug-at l-1). The oxygen values are very variable too, ranging between 0 and 14.4 ml l-1. Four different patterns of nutrient distribution have been distinguished based on the mean concentrations of N.NO3- and TRP (mean values in ug-at l-1): A, N.NO3- < 10, TRP > 1; B, N.NO3-> 100, TRP < 1; C, 10 < N.NO3- < 100, TRP < 1; D, N.NO3- < 10, TRP < 1. As a rule, lagoons of low salinity (C1 and C2 classes) display the nutrient pattern C, and lagoons of high salinity (C3 and C4) show the nutrient pattern D. Model A only appears in waters of very low salinity, whereas model B does not seem to be related to salinity. |
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