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Related Experiment Video

Updated: Jul 9, 2026

Streamlined Sampling and Cultivation of the Pelagic Cosmopolitan Larvacean, Oikopleura dioica

Streamlined Sampling and Cultivation of the Pelagic Cosmopolitan Larvacean, Oikopleura dioica

Published on: June 16, 2020

Allelopathy between zooplankton: a mechanism for interference competition.

C Folt, C R Goldman

Science (New York, N.Y.)

|September 4, 1981

Summary

This summary is machine-generated.

The copepod Diaptomus tyrrelli shows a 60% reduced filtering rate when Epischura nevadensis is present. This is due to a large-molecule chemical released by Epischura, indicating interference competition.

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Last Updated: Jul 9, 2026

Streamlined Sampling and Cultivation of the Pelagic Cosmopolitan Larvacean, Oikopleura dioica

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Published on: June 16, 2020

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Measuring Photophysiology of Attached Stage of Colacium sp. by a Cuvette-Type Fast Repetition Rate Fluorometer

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Published on: November 12, 2021

Area of Science:

Aquatic ecology
Chemical ecology
Interspecies interactions

Background:

Copepods are crucial zooplankton in aquatic ecosystems.
Species interactions, including competition and predation, shape ecological dynamics.
Chemical cues play a significant role in mediating these interactions.

Purpose of the Study:

To investigate the impact of Epischura nevadensis presence on the filtering rate of Diaptomus tyrrelli.
To identify the nature of the chemical signal mediating this interaction.
To understand the ecological implications of interference competition in zooplankton communities.

Main Methods:

Experimental manipulation of copepod densities.
Measurement of filtering rates.
Dialysis experiments to characterize the chemical signal's molecular weight.

Main Results:

A significant reduction (up to 60%) in Diaptomus tyrrelli filtering rate was observed in the presence of Epischura nevadensis.
This effect was attributed to a chemical released by Epischura.
The chemical was retained by dialysis tubing with 10(4) angstrom pores, suggesting a large molecular weight.

Conclusions:

Epischura nevadensis chemically interferes with Diaptomus tyrrelli feeding.
This interference competition may be an adaptive strategy for Epischura to reduce predation risk.
Chemical communication is a key factor in structuring zooplankton communities.