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Figure 12.16: Recorded distribution of major invasive submerged weeds (Ceratophyllum demersum, Egeria densa, Lagarosiphon major, Elodea canadensis, and Hydrilla verticillata) in freshwater systems, 1970 and 2004

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Data source: National Institute of Water and Atmospheric Research.

Text description of figure

This image shows two maps of New Zealand, the first shows the location of the submerged freshwater weeds as recorded by 1970, the other shows the location of these weeds as at 2004. A many-fold increase of records of the weeds is evident, particularly towards the inland.