An Interactive Introduction to Organismal and Molecular Biology, 2021

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SPECIES INTERACTIONS | 83 Exercise Test your understanding of species interactions! An interactive or media element has been excluded from this version of the text. You can view it online here: https://openbooks.lib.msu.edu/isb202/?p=199 Learn more about “aquatic cleaning stations“! Niches and How They Influence Competition Resources are often limited within a habitat and multiple species may compete to obtain them. All species have an ecological niche in the ecosystem, which describes how they acquire the resources they need and how they interact with other species in the community. The competitive exclusion principle states that two species cannot occupy the same niche in a habitat. In other words, different species cannot coexist in a community if they are competing for all the same resources. An example of this principle is shown below with two protozoan species: Paramecium aurelia and Paramecium caudatum. When grown individually in the laboratory, they both thrive. When they are placed together in the same test tube (habitat), P. aurelia outcompetes P. caudatum for food, leading to the latter’s eventual extinction.
84 | SPECIES INTERACTIONS Paramecium aurelia (graph a) and Paramecium caudatum (graph b) grow well individually, but when they compete for the same resources, the P. aurelia outcompetes the P. caudatum. In graph c, the top growth curve is P. aurelia and the bottom growth curve is P. caudatum. Exercise Does competition between two species that share a similar niche always result in one dying off? Try out the Virtual Biology Lab’s simulation of barnacle competition. Once on the website, read through the background information and the tutorial. Then run the experiment- feel free to keep the variables consistent or see what happens when you change them.
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INTRODUCTION Andrea Bierema This
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UNIT I INTRODUCTION TO SCIENCE
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An Interactive Introduction to Organismal and Molecular Biology, 2021

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