Download Intraspecific Competition

HOW ORGANISMS INTERACT IN COMMUNITIES
WHAT SHAPES A COMMUNITY??
PREDATION & COMPETITION!!
(food, SHELTER, light, nutrients, water)
Five Basic Interactions Between Species
1) Competition
1) Interspecific competition – between two or more species
2) Intraspecific competition – between members of same
species
2) Predation
3) Parasitism
4) Mutualism
5) Commensalism
WHAT IS A NICHE?
An organism’s niche describes:
1. The organism’s role in the community
2. It’s use of resources
Fundamental Niche
the full range of conditions and resources it could
potentially use
Determined by abiotic factors
Realized Niche
that part of a fundamental niche that an organism
occupies
Determined by biotic factors (COMPETITION!)
INTERSPECIFIC COMPETITION = niches of two different species
overlaps
Migrate
Shifts its feeding habits
One of the species suffers population
decline (even to extinction)
If the niches of two species overlap
completely or significantly – how
long can they both last?
What’s an organism to do?
Move, adapt, or die
Avoid or weaken competition by:
Symbiosis
Resource partitioning
A niche restricted by competition is a
a) Fundamental niche
b) Realized niche
c) Resource partitioned niche
True or False: A fundamental niche includes the
full resources and habitat an organism can
survive in.
 Have broad ranges
 Live in a variety of places, eat a spectrum of foods, &
tolerate a wide range of environmental conditions
 Have narrow ranges
 Live in one type of habitat, rely on one type of food
source, or have limited range of environmental
tolerance
 Are typically endangered species
A: Interspecific Competition B: Intraspecific Competition
1. Two squirrels race up a tree to reach a hidden pile of nuts.
2. A hyena chases off a vulture to feast on an antelope
carcass.
3. Different species of shrubs and grasses on the forest floor
compete for sunlight.
4. Brown bears hunting for fish on a river’s edge fight over
space.
5. Male big horn sheep butt heads violently in competition
for mates.