This document discusses interspecific competition, which involves two or more species competing for a common, limited resource. It can take two forms: exploitation, where one species uses up the resource leaving none for others; and interference, where one species prevents others from accessing the resource. The document then describes six types of interspecific interactions defined by Thomas Schoener: consumption competition over consuming a shared resource; preemptive competition over occupying space; overgrowth competition by one species growing over another; chemical competition using toxins to inhibit other species; territorial competition over defending space; and encounter competition where meetings negatively impact species. Examples are provided for each type of competition.

1. BRENT BONIOR | PAULA MARIE LLIDO |
EARL JUDD SULLANO | JAEN KIETH ROCIOS |
AEMEE ROZANNE UY | JINSHEEN YOUNG
| NOVEH TIU
INTERSPECIFIC
COMPETITIONCHAPTER 14

2. 14.1
INTERSPECIFIC
COMPETITION INVOLVES
TWO OR MORE SPECIES
THAT SEEK A COMMON
RESOURCE IN SHORT SUPPLY
(AS IN INTRASPECIFIC COMPETITION)
BOTH KINDS OF COMPETITION MAY TAKE PLACE
SIMULTANEOUSLY

3. INTRASPECIFIC OR
INTERSPECIFIC COMPETITION?
Squirrels compete among themselves for
acorns during a year when oak trees produce
fewer acorns.
At the same time, wild turkey, blue jay and mice
vie for the same resource, the acorns.

4. EXPLOITATION
INTERFERENCE
INTERSPECIFIC COMPETITION
TAKES TWO FORM:
organisms use up resources directly which
will no longer be available
for other species to use.
one organism prevents other
organisms from using the resource.

5. INTERACTIONS IN
INTERSPECIFIC COMPETITION
(THOMAS SCHOENER)
CONSUMPTION
PREEMPTIVE
(THOMAS SCHOONER)OVERGROWTH
CHEMICAL
TERRITORIAL
ENCOUNTER

6. CONSUMPTION COMPETITION
Occurs when individuals of one species inhibit another
species by consuming a shared resource

7. Occurs primary among sessile
organisms where the
competition by one individual
precludes establishment
(occupation) by others
PREEMPTIVE COMPETITION

8. OVERGROWTH COMPETITION
occurs when one organism
literally
grows over another
(with or without physical
contact), inhibiting access
to some essential resource

9. CHEMICAL COMPETITION
chemical growth inhibitors
or toxins released by an
individual inhibit or kill other
species
Ex. Sunflower (allelopathic)

10. TERRITORIAL COMPETITION
Results from the
behavioral exclusion of
others from a specific
space that is defended as a
territory

11. ENCOUNTER COMPETITION
when nonterritorial
meetings between
individuals negatively
affect one or both
of the participant species

12. WHICH IS
WHICH?
CONSUMPTION
PREEMPTIVE
OVERGROWTH
CHEMICAL
TERRITORIAL
ENCOUNTER

13. WHICH IS
WHICH?
CONSUMPTION
PREEMPTIVE
OVERGROWTH
CHEMICAL
TERRITORIAL
ENCOUNTER

14. WHICH IS
WHICH?
CONSUMPTION
PREEMPTIVE
OVERGROWTH
CHEMICAL
TERRITORIAL
ENCOUNTER