Abstract
Spore germination characteristics of Azolla filiculoides Lamarck, a recent invader of the Doñana Mediterranean wetlands, have been quantified experimentally. Batches of spores were subjected to different storage conditions, salinity concentrations, phosphorus availability and drought effects. Cold pre-treatment did not stimulate spore germination, whereas drought, a characteristic different from Azolla's native habitat, reduced it (40 ± 7 vs 13 ± 5). Germination declined with the increase of salinity (r = −0.50, notably above 5000 μS cm −1), whereas phosphorus availability had no significant effect.
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