Download ecosystems and communities notes third class

ECOSYSTEMS AND COMMUNITIES
Learning Goal: In this lesson we will learn about abiotic and biotic components of an
ecosystem. We will also learn about how populations interact with other
populations within their communities.
BIOTIC VS. ABIOTIC FACTORS
Biotic factor: __________________________________________________
Abiotic factor:
__________________________________________________
Can you list abiotic and biotic factors in this picture?
HABITAT VS. NICHE
________________: the area where an organism lives, including the biotic and
abiotic factors that affect it
_________________: an organism’s habitat plus its role in an ecosystem
COMMUNITY INTERACTIONS
_________________: when organisms of the same or different species
attempt to use an ecological resource at the same time
Example: in a forest, broad-leaved trees may compete for sunlight by growing
tall, spreading out their leaves and blocking sun to shorter plants
•
Competitive exclusion principle: no two species can occupy the same niche at
the same time
_________________: an interaction in which one organism captures and
feeds on another organism
Example: Some types of bears capture and eat fish
_________________: symbiotic relationship in which one organism benefits while
the other is harmed
Example: fleas, ticks and lice feed off
the blood and skin of mammals
_________________: symbiotic relationship in which both organisms benefit
Example: oxpeckers eat the insects off large mammals in Africa
_________________: symbiotic relationship in which one organism benefits
while the other is neither harmed nor does it benefit
Example: Remoras eat the small pieces of food that are created when sharks eat