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- I intend to study the respective densities of invasive phragmites and native cattails in the urban wetland ecosystem of Grenadier Pond, High Park.
- High densities of aquatic plants (including both phragmites and cattails) occur at the northern and southern ends of Grenadier Pond (see image below). I will demarcate sections along the (terrestrial) gradients of the northern and southern shores of the pond (counting species in aquatic quadrants would be too complicated), and count the respective number of observed phragmites and cattails in each section. Superficially, I can already observe that in three randomly selected (and roughly equally sized) sections of the northern shore of the pond, phragmite density seems to be inversely proportional to cattail density.
- I hypothesize that local areas in which the density of phragmites is higher will have correspondingly low densities of cattails, due to strong interspecies competition between invasive phragmites and native cattails.
- The explanatory variable is the local density (individual plants per unit area) of phragmites and the response variable is the local density (individual plants per unit area) of cattails. Both are continuous.
