A1 Journal article (refereed)
Innate antipredator behavior can promote infection in fish even in the absence of predators (2020)

Mikheev, V. N., Pasternak, A. F., Morozov, A. Y., & Taskinen, J. (2020). Innate antipredator behavior can promote infection in fish even in the absence of predators. Behavioral Ecology, 31(1), 267-276. https://doi.org/10.1093/beheco/arz188

JYU authors or editors

Publication details

All authors or editors: Mikheev, Victor N.; Pasternak, Anna F.; Morozov, Andrew Yu.; Taskinen, Jouni

Journal or series: Behavioral Ecology

ISSN: 1045-2249

eISSN: 1465-7279

Publication year: 2020

Volume: 31

Issue number: 1

Pages range: 267-276

Publisher: Oxford University Press

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1093/beheco/arz188

Research data link: https://doi.org/10.5061/dryad.7sqv9s4p0

Publication open access: Not open

Publication channel open access: 

Abstract

Natural enemies—predators and parasites—largely shape the dynamics of ecosystems. It is known that antipredator and antiparasite defense can be mutually conflicting, however consequences of this trade-off for the regulation of infection burden in animals are still poorly understood. We hypothesize that even in the absence of cues from predators, innate antipredator behavior (“ghost of predation past”) interferes with defense against parasites and can enhance the infection risk. As a case study, we explore interactions between a commercial species, the rainbow trout Oncorhynchus mykiss, and its parasite, the trematode eye-fluke Diplostomum pseudospathaceum. Fish–parasite interactions were tested in compartmentalized tanks where shelters and parasites were presented in different combinations providing various conditions for microhabitat choice and territorial behavior. Shelters were attractive and contestable despite the absence of predators and presence of parasites. The individuals fighting for shelters acquired more than twice the number of cercariae as compared to those in infected shelter-free compartments. Most infected were subordinate fish with a higher ventilation rate. Fish possessing shelters were less vulnerable to parasites than fighting fish. Grouping reduced the infection load, although less efficiently than sheltering. Our data demonstrate that the innate antipredator behavior can undermine antiparasite tactics of the fish and result in higher infection rates. Using our empirical results, we construct a mathematical model which predicts that enriching the environment in fish farming will be beneficial only when a large number of shelters is provided. Using insufficient number of shelters will increase the parasite burden in the fish.

Keywords: animal behaviour; fishes; predation; parasitism; parasites; rainbow trout; trematoda; aquaculture

Free keywords: behavioral tactics; Diplostomum pseudospathaceum; enriched habitat; fish parasites; innate antipredator behavior; sustainable aquaculture

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2