Ecology:
Soil Distur­­bance

Coastal prairies may have evolved with intense levels of soil disturbance from burrowing and rooting animals, many now extinct in coastal prairie habitat. Burrowing for food, such as tubers and roots,has the potential to cause extensive disturbance due the repetitive and widespread nature of the activity.

Burrowing Animals of Coastal Prairie

Rooting caused by wild pigs in Sonoma County at Austin Creek State Recreation Area in 2000. Photo credit: Rick Sweitzer. Used with permission from University of California Statewide IPM Program.

While moderate digging disturbs and kills some plants, it also opens up opportunities for others. Digging can benefit plants by thinning out dense clumps of bulbs and creating open areas of mineral soil in which seeds can germinate.

Some species thrive under disturbance. In Montana, glacier lilies (Erythronium grandiflorum) are regularly consumed by Grizzly Bears. Meadows that were dug up by grizzlies contained higher nitrogen and carbohydrate content than those in undug meadows. Glacier lily plants growing in grizzly bear digs also produced twice as many seeds (California Native Plant Society Santa Cruz Chapter).

Several species are master's of soil disturbance in coastal prairies: