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Ecological Interactions

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Mark Van Arsdale

on 6 September 2018

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Transcript of Ecological Interactions

Ecological Interactions
From: http://perth.uwlax.edu/faculty/howard/BIO101/Energyflow&communities/sld010.htm

This means that…

No two species can occupy the same ecological niche. or…
Two species cannot coexist unless they are doing things differently because competition will result, and one species will beat out the other.

But…

From: http://perth.uwlax.edu/faculty/howard/BIO101/Energyflow&communities/sld010.htm

Consider two species of barnacle, what are the minimum and maximum number of days of submergence within which the species can survive?

From: http://perth.uwlax.edu/faculty/howard/BIO101/Energyflow&communities/sld010.htm

A Niche is defined as, "the limits, for all important environmental features, within which individuals of a species can survive, grow and reproduce.”
From: http://perth.uwlax.edu/faculty/howard/BIO101/Energyflow&communities/sld013.htm

Mutualism =



Commensalism =


Parasitism =

Symbiosis
species 1 species 2

Connell's conclusions
What is the difference between resource partitioning or character displacement?
Not to be confused with predation
Connell Found the that...
or attempts to avoid predation
Some species are ecosystem engineers
http://www.arkive.org/acorn-barnacle/semibalanus-balanoides/video-00.html
http://www.arkive.org/american-beaver/castor-canadensis/video-03b.html
What can we learn from ants?
Practice Question: Why do moderate levels of disturbance result in an increase in community diversity?
A) Habitats are opened up for less competitive species.
B) Competitively dominant species infrequently exclude less competitive species after a moderate disturbance.
C) The environmental conditions become optimal.
D) The resulting uniform habitat supports stability, which in turn supports diversity.


The role of
Fire
and disturbance
and..
From: http://perth.uwlax.edu/faculty/howard/BIO101/Energyflow&communities/sld010.htm

Chthamalus is limited by competition

Balanas by environement
Full transcript