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Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

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Interspecific morphogens regulating prey-predator relationships in protozoa.

H W Kuhlmann, K Heckmann

Science (New York, N.Y.)

|March 15, 1985

Summary

Predator cues trigger defensive morphogenetic changes in the ciliate Euplotes octocarinatus, altering cell architecture without cell division. This adaptation helps regulate prey and predator populations, fostering coexistence.

Area of Science:

Cellular biology
Ecology
Developmental biology

Background:

The ciliate Euplotes octocarinatus exhibits predator-prey interactions.
Predator-released substances can induce responses in prey organisms.

Purpose of the Study:

To investigate the morphogenetic response of Euplotes octocarinatus to predator-released substances.
To understand the implications of these changes for population dynamics and coexistence.

Main Methods:

Exposure of Euplotes octocarinatus to predator-released substances.
Observation of cellular changes and their perpetuation during reproduction.

Main Results:

Predator cues induce rapid morphogenetic changes in Euplotes octocarinatus.

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These defensive changes inhibit prey engulfment and do not require cell division.

Changes are maintained during reproduction under sustained morphogen presence.

Conclusions:

Signal-induced cell transformation in Euplotes octocarinatus is a defensive mechanism against predation.
This adaptation can dampen population oscillations, promoting prey-predator coexistence.
The study highlights developmental implications of signal-induced cell architecture changes.