Table 2. Threat classification table for short-rayed alkali aster.

Threat category	General threat	Specific threat	Stress	Threat attributes
				Extent	Occurrence		Frequency		Causal certainty		Severity		Level of concern
					Local	Range-wide	Local	Range-wide	Local	Range-wide	Local	Range-wide
1 Recreational degradation (Vaseux Lake, Skaha Lake, Osoyoos Lake)
Habitat loss or degradation	Recreational activities	Beach use – sunbathing, digging, boat launching and storage, trampling and compaction	Reduced numbers of plants	widespread (3 populations)	current		seasonal		unknown		moderate		high
2 Beach management (Skaha Lake, Osoyoos Lake)
Habitat loss or degradation	Habitat alteration	Roto-tilling of the beach	Loss of seedlings, mature plants, and seeds	widespread (2 of 4 populations)	current		seasonal		Unknown, but potentially moderate to high at Skaha Lake population. Low at Osoyoos Lake southeast shore subpopulation #3.		high		high
3 Invasive plant species (Vaseux Lake, Max Lake, Osoyoos Lake, Skaha Lake)
Exotic or invasive species	Alteration of habitat characteristics	Resource competition leading to shading of seedlings	Reduced growth	Widespread (4 populations)		current		recurrent		medium		high	high
4 Livestock (Osoyoos Lake)
Habitat loss or degradation	Livestock use —shoreline impact	Alteration of habitat characteristics ; trampling of plants	Reduced numbers of plants.	localized	unknown		occasional		low		unknown		low
5 Shoreline development (Osoyoos Lake)
Habitat loss or degradation	Shoreline development	Habitat conversion, fragmentation	Reduced population size and viability, population extirpation	localized	One historical loss (Osoyoos lake southeast subpopulation #1); one potential		unknown		high		unknown		high
6 Loss of natural lake dynamics: water level control (Skaha Lake, Vaseux Lake, Osoyoos Lake)
Habitat loss or degradation	Managed lake levels	Alteration of natural water levels	Reduced population size and viability.	widespread (3 populations)	current		continuous/ seasonal		medium		high		high