Allelopathy

Topics: Species, Organism, Eucalyptus Pages: 12 (265 words) Published: April 21, 2014
Competition
Limiting resources

Definition: Interactions between individuals within
or among species in which each is harmed by
their shared use of a resource that limits their
ability to grow, survive, or reproduce
(- / - relationship)

Intraspecific/ Interspecific
competition

“Intra”  =  within  species

“Inter”  =  among  species

Exploitation/ Interference
Competition

Exploitative:

Interference:

scramble for a limiting resource
(Indirect Interaction)

Some individuals prevent others from
using a resource
(Direct Interaction)

Types of Competition:
Consumption
Preemption
One occupied site before
another

Overgrowth
Territoriality
Chemical

Outcomes of Competition:
Competitive Exclusion

Outcomes of Competition:
Stable co-existence
(resource partitioning)
Different species fill different niches

Today’s  Lab:  Competition

Pattern: Very few plants grow in the understory of
Eucalyptus trees

Pattern: Very few plants grow in the understory of
Eucalyptus trees
Possible Hypotheses ?

Pattern: very few plants grow in the understory of
Eucalyptus trees

Hypothesis: leaves exude toxic chemicals that inhibit
allelochemicals
neighboring plants

Today’s  Lab:  Allelopathy
• Allelopathy: is a biological phenomenon by which an
organism produces chemicals that influence the growth,
survival, and reproduction of other organisms (i.e. some
plants chemically inhibit the germination or growth of
competitors)
• The word comes from the Greek words allelon, meaning
“of  each  other”,  and  pathos,  meaning  “to  suffer”.   • The chemicals may be released from plant tissues
directly into the air (volatile chemicals), or released into the soil from the roots or from decomposing leaves.

Today’s  Lab:  Allelopathy

Fruits

Eucalyptus globulus
Both non-native, but globulus is invasive (has impact on other

Eucalyptus ficifolia
Now Corymbia ficifolia

Today’s  Lab:  Allelopathy
Wheat seeds

Water
(control)

Spinach
(leaf control)

C. ficifolia
formerly
E. ficifolia

E. globulus

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