jan 1, 1850 - Oak Ridges Moraine Species determined by diatoms and pollen
Description:
-Around A.D. 1850, the diatom flora changed from an assemblage dominated by large, benthic species (e.g. Sellaphora pupula, Pinnularia cf. maior, and Stauroneis phoenicenteron) to an assemblage characterized by smaller, tychoplanktonic (e.g. Fragilaria tenera, Staurosirella pinnata) and epiphytic (e.g. Achnanthidium minutissimum, Rossithidium linearis) taxa.
- The pollen record from ca. A.D. 1850 to present day indicated that tree species (e.g. Pinus spp., Tsuga canadensis) were declining, while grass (Poaceae) and invasive species (e.g. Ambrosia) were increasing.
- Swan lake's water quailty has never gone back to before the settlement happened..this is due to the deforestation that occured
Added to timeline:
ESTD17 Fauna and Flora of Toronto/ Rouge
Date:
