A female rotifer (Brachionus calyciflorus) with two eggs

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A female rotifer (Brachionus calyciflorus) with two eggs. The eggs are the result of parthenogenesis, or asexual reproduction by the female, which occurs in rotifers when growing conditions are favorable. Populations of this rotifer species, which can be maintained in a laboratory on a food source of algae, are an ideal model system for testing ecological theory in microcosms. Replicate populations of this species can be brought into synchrony either by the frequent dispersal of a small number of individuals from one population to another or by varying their food. This photograph originally appeared on the cover of Ecology (86:6) in June of 2005.

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Primary or BEN resource type	Photograph
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Format	jpeg
Ecological Core Concept	Populations -- Population growth and regulation Populations -- Life history traits and reproduction Populations
Drought & Water-Ecosystem Services Collection	Off
Conservation Targets Under Global Change Collection	Off
Big Data Collection	Off
Editor's Choice	No
Audience	Undergraduate upper division 15-16 Undergraduate lower division 13-14
Pedagogical Use Description	This photograph can be to illustrate asexual reproduction, parthenogenesis, population growth, or as an example of an organism used to test ecological theory in microcosms.
Keywords	parthenogenesis, amictic, reproduction, egg, microcosm
Key taxa	Brachionus calyciflorus, rotifer
Life science discipline (subject)	Ecology
Primary Author Controlled Name	Gregor Fussman
Primary Author Affiliation	n/a
Primary Author email	n/a
Rights	Copyright 2005 by the Ecological Society of America.
Resource Editor	Unknown
Reviewer A	Unknown
Reviewer B	Unknown
Date Of Record Submission	2008-04-04

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