History:
to ~10,000 BC

The last ~10,000 years, before European colonization, is termed the era of Aboriginal Prehistory. The first Americans may have swept the Western Hemisphere and decimated its fauna within 1,000 years.

Figure from Martin PS. 1973. The Discovery of America. Science 179:969-974.

Loss of Megafauna

The extinction of most of the North American megafauna coincided with the arrival of humans during the late Pleistocene, 12,000 to 11,000 years BP. There is an ongoing debate about the causes of this major extinction event, which included many smaller mammals as well. There are four main ideas concerning the loss of megafauna. The first is that early humans hunted them to extinction, often called the “Pleistocene overkill” hypothesis. The second major hypothesis is that the extinctions were a result of climate shifts during the last Ice Age. The third is that a virulent “hyperdisease” brought to North America with the first humans and their dogs swept through and devastated populations. The fourth is an extraterrestrial impact from a comet possibly exploded in the atmosphere (explaining why no crater remains).

Scientist are now investigating the stories of individual regions and species to unearth the events that led to the North American extinction event (Grayson 2008; Jones, et al. 2008).  It may be that a combination of environmental disturbance, stemming from the arrival of humans and climatic changes, interacted with hunting, disease, and with the unique life history traits of the animals themselves to contribute to the extinction of 35 genera of North American large mammals. However, of the 35 large mammals that went extinct in North America, 29 became globally extinct at the same time indicating that a large synchronous event occurred between 12,000 to 11,000 years BP to wipe out the world’s megafauna (Faith and Surovell 2009).

Anthropogenic Fire

The use of fire has been documented for the California Tribes that occupied coastal prairie (Heady, et al. 1977).

Seeds can survive grassland fires because the fires are fast burning and relatively cool (Howard 1998).

Coast Pomo gathering seeds with a burden basket.
Coast Pomo woman using seed beater to gather seeds into a burden basket c1924. Photo by Edward Curtis. Courtesy of Library of Congress.

Human Agro-tending: California Native American Uses and Practice

Although Native Californians did not domesticate crops they developed an intimate knowledge of native plants and “cultivated” grasslands using a variety of management techniques to increase food and material resources (Anderson 2007).

Heizer and Elasser (1980) estimated that California’s native people utilized over 500 species of plants and wild animals for food. Species lists in ethnological studies show that may of the plants utilized were from coastal prairies (Bocek 1984; Chesnut 1902; Goodrich, et al. 1980; Moerman 2003; Stodder 1986).

Although there are no detailed written accounts observing past Native American management of coastal prairies (Ford and Hayes 2007), Native Americans, ethnoecologists, restoration ecologists and others are working to document and reconstruct plant management practices (Anderson 2005; Anderson 2007; Lawson and Lawson 1976; Peri 1985; Peri and Patterson 1976).