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When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.Intraspecific competition, which occurs between individuals of the same species, serves as a natural mechanism for regulating population size. Too much...

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Colonization of Euprymna scolopes Squid by Vibrio fischeri

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Published on: March 1, 2012

On testing the competition-colonization trade-off in a multispecies assemblage.

Marc William Cadotte¹, Donny V Mai, Samuel Jantz

¹Complex Systems Group, Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee 37996, USA. cadotte@lifesci.ucsb.edu

The American Naturalist

|November 3, 2006

Summary

Species coexistence relies on a competition-colonization trade-off, where organisms are either strong competitors or rapid colonizers, but not both. This fundamental ecological principle was demonstrated in a laboratory setting using protozoa and rotifers.

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Area of Science:

Ecology
Community Ecology
Interspecific Interactions

Background:

The competition-colonization trade-off is a key mechanism proposed to explain species coexistence in diverse ecosystems.
Existing research primarily focuses on plants and their seed dispersal, with limited data on other taxa.
Colonization success involves not only dispersal but also rapid population growth, a factor often overlooked.

Purpose of the Study:

To investigate the presence and generality of the competition-colonization trade-off in non-plant species.
To determine if this trade-off extends to microbial assemblages in controlled environments.
To assess the roles of competitive ability and colonization capacity in species coexistence.

Main Methods:

Utilized a standardized laboratory microcosm with protozoan and rotifer species.
Defined colonization as the capacity of a species to establish populations in unoccupied patches.
Quantified competitive interactions through pairwise assays and ranked species based on colonization and competitive abilities.

Main Results:

Demonstrated a clear competition-colonization trade-off within the tested protozoan and rotifer assemblage.
Species were found to be either superior competitors or effective colonizers, but not both.
The findings support the existence of this trade-off beyond plant systems.

Conclusions:

The competition-colonization trade-off is a valid ecological mechanism applicable to non-plant species, including microscopic organisms.
Even in simplified laboratory settings, species exhibit inherent trade-offs that influence their ecological strategies.
This study broadens the understanding of factors promoting species coexistence in structured environments.