Bigleaf Maple (Acer macrophyllum) along the riverbed of the Cameron River at Macmillan Provincial Park in Port Alberni, British Columbia, Canada
The Bigleaf Maple (Acer macrophyllum) in this photograph (left) is a good example of an ecological “edge effect”. In ecology the edge effect refers to the phenomenon that species (and diversity) you would normally see within an area change along the boundary with a different area. This can be the edge of a trail or road, a clear cut, grassland/forest transitions and in this case, the edge of the Cameron River in Macmillan Provincial Park on Vancouver Island. In this particular type of forest, you’ll get Bigleaf Maples, Vine Maples, Red Alder (successional species) and a number of other tree species growing on a newly formed or existing edge. Just inside the edge the majority of the trees are conifers such as Western Red Cedar and Douglas Fir. This was one of the better specimens of mature Bigleaf Maple in Macmillan Provincial Park that I found. The tree on the right hand side of the image is a Red Alder (Alnus rubra) and is also a frequent edge resident.
You can see more of my photos of this area in my Vancouver Island Gallery.