Download Competition Among Organisms

Competition Among
Organisms
Why Organisms Compete
 Limited
supplies of resources will cause
organisms to fight over those resources.
 Resources include:
 Water,
food, sunlight, and living space.
 Competition
can occur between
members of the same species or
between members of different species.
Same Species Competition
 Compete
over territory.
2
male birds of the same species may fight
over a territory that would allow them to
make a nest, eggs, and feed offspring.

This type of competition is very important in
evolution.
 Trees
also compete. Those that are the
tallest or that have the best root system are
survivors.
Competition Between Species
 Usually
caused by limited resources,
such as food and water.
 The 2 species can usually coexist.
 Hawks
and owls both eat mice-hawks hunt
during the day and owls hunt at night.
 This can also be very important for
evolution.
Nonnative Species
 A nonnative
species is one that is new
to the ecosystem-it has never existed
there before.
 These can cause harm to an ecosystem
by harming the environment or by
harming the health of the organisms.
 When this happens it is called an
invasive species.
Invasive Species
 Invasive
species are the second greatest
destroyers of biodiversity.
 Human actions are the main cause for
invasive species.
 When
people move far away, they take
insects and small organisms with them
unintentionally.
 These species disrupt their new ecosystem,
usually causing extinction.
 Increased travel and trade are also major
ways an invasive species enters an area.