Unit 7 Test
Intermediate Disturbance Hypothesis (Connell 1978): IDH predicts that the highest
species richness will occur at an intermediate level of intensity or frequency of natural
disturbance. Large, infrequent, disturbances are often catastrophic and include
disturbances such as floods, forest fire, hurricanes and volcanic activity. A woodlot may
be transformed by a severe fire into an open field dominated by herbs and grasses. A
less severe fire may transform a maple woodlot into one that is dominated by ash and
popular seedlings. Natural disturbances are very important in shaping landscapes and
influencing ecosystem processes.
Ecosystem function: The exchange of energy and nutrients among plants, animals
and their environment.
Ecosystem Services: Refers to the processes within ecosystems that provide
fundamental resources such as water, clean air or even the decomposition of waste
products. Woodlots provide many services such as carbon recycling (e.g., carbon
dioxide in the air converted into biomass in wood and leaves), animal waste filtering
from adjacent farms and filtering of watersheds.
Adaptive management: Utilizes ecosystem management
as a tool to alter the functioning of an ecosystem. This approach
is designed to test hypotheses about the functioning of