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Health of the Rideau River

 

Biodiversity at a Glance:
Long Island to Hogs Back

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.

Each species category measures its biodiversity index on its own scale. In order to facilitate interpretation and comparison with other species categories, we have attributed a level (high, moderate, low) to the value calculated.


 Summary of Results of Research Conducted in 1998 through 2000
Category Biodiversity Index* Biodiversity Rating Comments
Aquatic Plants
(1999**)
not available not available The biodiversity index could not be calculated because analysis of results from this section has not been completed.Nevertheless, it is known that 31 species were present, out of the 51 species found in the River.Native plant diversity and abundance were low because artificially developed shorelines in many places limit plant growth.
Aquatic Birds
(spring 1999**)
1.49 high Aquatic birds are less abundant here than in rural areas because of limited habitat and residential development.
Fish 2.51 moderate Twenty species were present, out of 30 species native to the River. Few minnows or juvenile sport fish were found.
Native Freshwater Mussels 0.83 moderate High zebra mussel density.Four native mussel species were present in this section, of the 8 species found in the River. In 2000, all native mussels found in Mooneys Bay were dead, killed by zebra mussels. At Dickinson Bridge in Manotick, 1 of the 6 mussel species native to the River was found alive.
Aquatic Invertebrates not available not available No data are available for this section.
Amphibians not available not available Suitable shoreline habitat has been reduced. Heavy boat traffic likely disturbs life cycles, although the degree of disturbance is unknown. Frog populations are not as abundant as they once were, according to the local residents.
Reptiles not available not available The size of some turtle populations in this section may be reduced due to a lack of nesting and basking sites. Red-eared sliders, released by pet owners, were found.

 

  Long Island to Hogs Back  
Arrow.  
Bullet. 
Arrow.  
Arrow.  
 Don't Overlook...  
Arrow.  
Arrow.  
Arrow.  
Arrow.  

Map of the Rideau River between Long Island and Hogs Back.
See a detailed map of the Rideau River between Long Island and Hogs Back.


Red-eared slider, Trachemys scripta elegans.
Red-eared slider, Trachemys scripta elegans.


Leaves of fragrant white water lily, Nymphaea odorata.
Leaves of fragrant white water lily, Nymphaea odorata.


*Use of the Biodiversity Index value to compare the different sections of the River is appropriate within a single species category.

**Results from 1999 were selected because it is not appropriate to combine the results of the three years of research (1998 to 2000).


A Project of the Canadian Museum of Nature
 Images: Canadian Museum of Nature, Ed Hendrycks