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Lecture

ENV100Y5 Lecture Notes - Camouflage, Intraspecific Competition, Interspecific Competition


Department
Environment
Course Code
ENV100Y5
Professor
murk

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Sept 23, 2011 Chapter 4: Species Interactions and Community Ecology
Topics:
Species interactions
Feeding relationships
Energy flow
Trophic levels and food webs
Zebra mussels:
-Arrived in 1988 European ships discharged water into Lake St. Clair, Canada
-Within 2 years they showed up in all 5 Great Lakes
-No natural predators, competitors, or parasites
-They spread rapidly and are an invasive species
-Hundreds of millions of dollars of damage to property
SPECIES INTERACTIONS
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Competition = multiple organisms seek the same limited resources
intraspecific competition vs. interspecific competition
inter : 2 diff species interacting
intra: 2 of the same species
Competitive exclusion or species coexistence
RESOURCE PARTITIONING
Species divide shared resources by specializing in different ways
ie) the lions will kill the zebra and eat what they want
hyenas and vultures wait and eat whatever if left
EFFECTS OF RESOURCE PARTITIONING
Character displacement = characteristics diverge to lessen competition
and to eat different things
if birds live on the same island they have a larger variety of beak sizes
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