Vob.
is a process in which organic matter and nutrients slowly build up in a lake or pond ecosystem.
eutrophication
natural disasters caused by heavy rains
floods
A community may start to grow in an area that has no soil.
primary secession
is an event that changes the ecosystem.
disturbance
start from natural event or human activities (lighting and campfires can cause them)
wildfires
if soil is left intact, the original community may regrow through a series
second secession
the slow development or replacement of an ecological community by another ecological community over time
succession
form in the ocean and can move to land
hurricanes
what is helping ecosystems change?
by organisms, wind, water, other parts of the environment
the first organisms in an uninhabited area
pioneer species
has violent, swirling winds that form a funnel cloud that touches down on land.
tornado
How do people help change ecosystems?
building houses, clearing forests, throwing out garbage, or introducing new animals and/or plants
the number and variety of species that are present in an area
biodiversity
a huge, fast- can moving wave caused by an underwater earthquake or volcanic eruption.
tsunami
How many secessions do ecosystems need to recover?
2