Zannichellie à Feuilles Obtuses

The habitat of the species could be subject to anthropogenic threats such as drainage, filling in or change in salinity. Pollution from agricultural activities, i.e. run off with sediments and fertilizers entering the pools can pose another threat. Negative effects are caused by marsh management for hunting: the marshes are kept under a permanently high water level to provide more biomass and to attract hunters. The marshes keep flooded artificially are also frequent in protected areas for attracting aquatic birds. Invasive species such as Azolla filiculoides, which can be dispersed by birds modifies the habitat structure, limit the development of some populations. The species could be severely affected by introduced species such as Cyprinus carpio a voracious fish which feeds on aquatic plants. Also the consequences of droughts caused by climate change process could be an important threat.

In recent years some of these localities have changed the quality of their waters, towards eutrophication and in many cases, in endorheic temporary pools, they are full of sediments and fertilizers from the neighbouring cultures. In consequence in several of these localities this species is not present any more.

Even in protected areas (e.g. Donana National Park) the habitat of this species is being altered slowly by fertilizers and herbicides which arrive in water from agricultural crops from nearby places.

Besides, in some localities (e.g. Donana National Park) the exotic invasive species Azolla filiculoides have recently appeared and now is expanding. This species modifies the habitat and stops the growth of this species.