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Health of the Rideau River
 Biodiversity Index Graphs
 Biodiversity Index Graphs

This graph is also available in an interactive form, which requires Macromedia Flash 5 or greater. You can download this software from the Macromedia Web site.

The results of research conducted during the Project have allowed the calculation of a biodiversity index, for aquatic plants and certain animals. The biodiversity index reflects both diversity and abundance.

The index values that were calculated are shown here on bar graphs. The bars have been coloured. These colours indicate an evaluation of the value. The colour green indicates biodiversity is good, yellow indicates moderate biodiversity, and red indicates poor biodiversity.

Whether by value (a number) or by evaluation (a colour), you can compare the status of a single category (e.g. fish) in the different sections of the Rideau River.

You should not compare the values of different categories because the range of each category's scale is specific to the category. Some categories have a smaller range, so the values for some categories will be consistently lower than those calculated for other categories. A "low" value, however, does not necessarily mean biodiversity is poor. For example, because there are naturally fewer mussel species than fish species, the values calculated for mussels will always be lower than those for fish. Within the range appropriate to mussels, the value that was calculated might reflect that mussel biodiversity is good. This evaluation is indicated by the colour of the bar.


A Project of the Canadian Museum of Nature   
 Images: Jana Bishop