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Related Experiment Video

Updated: May 2, 2026

Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

Published on: September 4, 2016

Parasite modification of predator functional response.

Benjamin J Toscano¹, Burns Newsome, Blaine D Griffen

¹Department of Biological Sciences, University of South Carolina, Columbia, SC, 29208, USA, benjamin.toscano@gmail.com.

|February 26, 2014

Summary

Parasitic barnacles significantly reduce mussel consumption by crabs, altering predator-prey dynamics. Infected crabs show behavioral changes, impacting their functional response and potentially host-prey populations.

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Area of Science:

Ecology
Parasitology
Marine Biology

Background:

Parasites can alter host behavior, influencing predator-prey interactions and population dynamics.
The rhizocephalan barnacle Loxothylacus panopei infects the crab Eurypanopeus depressus.

Purpose of the Study:

To test if parasitic infection modifies the functional response of Eurypanopeus depressus crabs to their prey, Brachidontes exustus mussels.
To investigate the behavioral mechanisms underlying changes in the crab's functional response due to infection.

Main Methods:

Experimental manipulation of infected and uninfected crabs feeding on mussels at varying densities.
Measurement of mussel consumption, attack rate, and handling time.
Behavioral observations of infected and uninfected crabs interacting with prey.

Main Results:

Infection significantly reduced mussel consumption, decreasing the attack rate and maximum consumption (asymptote).
Handling time was unaffected, but infected crabs exhibited longer delays in initiating prey handling.
Larger parasite burdens correlated with longer inactivity periods before prey contact.

Conclusions:

Parasitic infection alters crab functional response primarily through behavioral changes, not increased handling time.
Infected crabs display reduced foraging efficiency, impacting predator-prey dynamics.
A significant infection prevalence (20%) in natural populations suggests a substantial ecological impact on crab-mussel interactions.