Abstract
Analyses of leaf osmolality and total nutrient content (N, P, K, Ca, Mg) of the coastal vegetation of the Sontecomapan lagoon (Veracruz, Mexico) reveals the influence of penetration of sea water, and the differences in mineral uptake by typical halophytic species (Rhizophora mangle and Laguncularia racemosa), facultative halophytes (Acrosticbum aureum) and non-halophytes (Pachira aquatica). In these species leaf sap osmotic pressure and the leaf area/weight ratio increase, while the leaf area decreases with the salinity of interstitial water. Total N and P contents are correlated in all species, and in the mangrove species their contents decrease in the sampling sites with higher influence of marine water. The K/Na ratio is considerably higher in the non-halophyte species (P. aquatica 15.9; A. aureum 18.1 to 14.1) compared to the halophytic mangrove species (R. mangle 1.4 to 0.6; L. racemosa 3.3 to 1.9).
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