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Ecological Interactions

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Mark Van Arsdale

on 2 September 2016

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Transcript of Ecological Interactions

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

Come up with a list of possible abiotic factors that could keep Balanus from invading the space of the Cthamalus barnacles.

Write a hypothesis about one, try to use if… then…

Develop a quick experiment to test this hypothesis, identify the independent variable, the control and the experimental group. The dependent variable should be the survival of Balanus barnacles.

Quick Experiment:

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.


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

Another Version of this experiment

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

For example, what are the minimum and maximum temperatures within which the species can survive? Or…

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 =

species 1 species 2

Connell's experiment
Resource partitioning or character displacement?
Not to be confused with predation
Consider the following...
or attempts to avoid predation
Some species are ecosystem engineers
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
and disturbance
Full transcript