Table 1.
Image data processed for change-detection analyses in Point Pelee National Park (PPNP).
Table 2.
Habitat types classified in image data for Point Pelee National Park.
Table 3.
Metrics used to describe habitat changes in Point Pelee National Park at the landscape and class scale.
Fig 1.
Habitat composition throughout the sampling period (1931 to 2015) in Point Pelee National Park.
The quality of the 1990 image did not permit classification of marsh ecosites/vegetation types (i.e., common reed, cattail organic shallow marsh, graminoid organic shallow marsh, forb organic shallow marsh) and is only presented at the community level (marsh). Habitat types comprising < 0.5% of the park are not shown.
Fig 2.
Land-cover trends over 85 years in Point Pelee National Park.
(a) Marsh habitats, excluding 1990. (b) Upland habitats. (c) Shoreline, beach and anthropogenic classes. Habitat types comprising < 0.5% of the park are not shown.
Fig 3.
Plot of areal extent of Point Pelee National Park and open sand barren/dune as a function of annual mean water level in Lake Erie (meters above sea level).
Both areal extent of Point Pelee National Park and open sand barren/dune were significantly correlated with water level (p = 0.01); Spearman’s rho correlation coefficient is shown separately for each correlation.
Fig 4.
Total area of Point Pelee National Park from 1931 to 2015.
A net loss of 58 ha was experienced over this time period. Years with a larger park area tend to be associated with higher water levels and vice versa.
Fig 5.
Change in marsh habitat in Point Pelee National Park between 1959 and 2015.
(a) and (b) indicate hotspots of major habitat change and infilling within the marsh (solid-lined boxes). (c), (d), and (e) indicate hotspots of invasive common reed (dashed-lined boxes).