Ancient conceptualizations of ecosystems exist in several Amerindian,
Asia-Pacific, European, and African cultures. The rediscovery by scien
tists of ecosystem-like concepts among traditional peoples has been im
portant in the appreciation of traditional ecological knowledge among
ecologists, anthropologists, and interdisciplinary scholars. Two key c
haracteristics of these systems are that (a) the unit of nature is oft
en defined in terms of a geographical boundary, such as a watershed, a
nd (b) abiotic components, plants, animals, and humans within this uni
t are considered to be interlinked. Many traditional ecological knowle
dge systems are compatible with the emerging view of ecosystems as unp
redictable and uncontrollable, and of ecosystem processes as nonlinear
, multiequilibrium, and full of surprises. Traditional knowledge may c
omplement scientific knowledge by providing practical experience in li
ving within ecosystems and responding to ecosystem change. However, th
e ''language'' of traditional ecology is different from the scientific
and usually includes metaphorical imagery and spiritual expression, s
ignifying differences in context, motive, and conceptual underpinnings
.