Distribució i ecologia dels macròfits submergits del delta de l'Ebre

• Main Authors: Comín Sebastián, Francisco A., Ferrer Parareda, Xavier
• Format: Article in Journal/Newspaper
• Language: Catalan
• Published: Institut d'Estudis Catalans 2005
• Subjects: Zannichellia palustris
• Online Access: https://revistes.iec.cat/index.php/BICHN/article/view/17183.001

Data on distribution and phenology of 16 species of submerged macrophytes in the Ebro Delta are given, together with a summarized table of some physical and chemical parameters of the waters where they were found. The distribution of the spermatophytes in relation to the salinity of the water is: freshwater (Nasturtium officinale and Myriophyllum verticillatum), β-oligohaline waters, up to 1 g Cl- l-1 (Ceratophyllum demersum, M. spicatum, Utricularia vulgaris, Potamogeton nodosus, P. pusillus, P. crispus, Zannichellia palustris and Najas minor). Oligo-β-mesohaline waters, up to 4 g Cl- l-1, (Najas marina). Mixohaline waters, 0,5-17 g Cl- l-1 (Potamogeton pectinatus, Ruppia maritima and Ruppia Cirrhosa). α-meso-polyhaline waters, 5-17 g - l-1 (Zostera noltii and Z. Marina). The submerged spermatophytes that are dominant in the coastal lagoons in the freshwater period (April-December) are: P. pectinatus, R. Cirrhosa and N. Marina. It seems that in α-oligohaline waters these enter into competition with each other. Field observations suggest that Najas dominate in clay and organic mud areas, P. pectinatus in silty-clay sediments and Ruppia in those of sandy composition.