Non-native vascular plants

Species–habitat associations in northern Alberta

Habitats, North

Models were used to show how number of non-native vascular plant species differed among vegetation and human footprint types in the Boreal and Foothills regions of Alberta (see methods). Models were only created for species that had at least 20 detections using data from ABMI. Predicted species abundance in each habitat type is shown with bars. Vertical lines indicate 90% confidence intervals. Dots within the forested habitat types show predicted species abundance in cutblocks of various ages.

Species–habitat associations in southern Alberta

Non-treed sites

Soils, non-treed, South

Models were used to show how number of non-native vascular plant species differed among soil and human footprint types in the grassland and parkland regions of Alberta (see methods). Models were only created for species that had at least 20 detections using data from ABMI. Due to natural disturbances and vegetation succession, varying amounts of aspen and other trees may be present on each soil type; the presence/absence of trees greatly affects the presence and abundance of many other biota. Predicted species abundance in each soil/human footprint type is shown with bars. Vertical lines indicate 90% confidence intervals.

Species–habitat associations in southern Alberta

Treed sites

Soils, treed, South

Models were used to show how number of non-native vascular plant species differed among soil and human footprint types in the grassland and parkland regions of Alberta (see methods). Models were only created for species that had at least 20 detections using data from ABMI. Due to natural disturbances and vegetation succession, varying amounts of aspen and other trees may be present on each soil type; the presence/absence of trees greatly affects the presence and abundance of many other biota. Predicted species abundance in each soil/human footprint type is shown with bars. Vertical lines indicate 90% confidence intervals.

Linear footprint relationships in northern Alberta

Linear footprint relationship, North

For linear footprint in northern Alberta, the pairs of points show the change expected from the average habitat with no linear footprint (left point) when 10% linear footprint is added (right point).

Linear footprint relationships in southern Alberta

Linear footprint relationship, South

For linear footprint in southern Alberta, the pairs of points show the change expected from the average habitat with no linear footprint (left point) when 10% linear footprint is added (right point).

Predicted relative abundance throughout Alberta under current conditions

Map

Habitat association models, plus models describing how number of non-native vascular plant species varied spatially and with climate gradients were used to predict species abundance in 1 km2 spatial units under current conditions. Predictions in each 1 km2 unit were made based on the vegetation and human footprint present in the 1 km2 unit in 2012. Pixels depicted in red were predicted to have the highest abundance, grading through light tan to dark blue where the number of non-native vascular plant species was predicted to be less abundant or absent. This figure has uncertainty due to uncertainty in the models and in the underlying vegetation map (see uncertainty map below).