Intraguild predation decreases predator fitness with potentially varying effects on pathogen transmission in a herbivore
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HIGHLIGHTED STUDENT RESEARCH
Intraguild predation decreases predator fitness with potentially varying effects on pathogen transmission in a herbivore host Andrew J. Flick1 · Tom A. Coudron2 · Bret D. Elderd1 Received: 2 August 2018 / Accepted: 5 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Predators and pathogens often regulate the population dynamics of their prey or hosts. When species interact with both their predators and their pathogens, understanding each interaction in isolation may not capture the system’s dynamics. For instance, predators can influence pathogen transmission via consumptive effects, such as feeding on infected prey, or nonconsumptive effects, such as changing the prey’s susceptibility to infection. A prey species’ infection status can, in turn, influence predator’s choice of prey and have negative fitness consequences for the predator. To test how intraguild predation (IGP), when predator and pathogen share the same prey/host, affects pathogen transmission, predator preference, and predator fitness, we conducted a series of experiments using a crop pest (Pseudoplusia includens), a generalist predator (Podisus maculiventris), and a generalist pathogen (Autographa californica multicapsid nuclear polyhedrovirus, AcMNPV). Using a field experiment, we quantified the effects of consumptive and non-consumptive predators on pathogen transmission. We found that a number of models provided similar fits to the data. These models included null models showing no effects of predation and models that included a predation effect. We also found that predators consumed infected prey more often when choosing between live infected or live healthy prey. Infected prey also reduced predator fitness. Developmental times of predators fed infected prey increased by 20% and longevity decreased by 45%, compared with those that consumed an equivalent number of non-infected prey. While this research shows an effect of the pathogen on intraguild predator fitness, we found no support that predators affected pathogen transmission. Keywords Epizootics · Intraguild predation · Prey quality · Resource quality · Biocontrol
Introduction Communicated by Sven Bacher. In support of being a highlighted student project, we provide a unique look at intraguild predation focusing on predators, prey, and prey pathogens. Predators preferred infected prey, infected prey reduced predator fitness. However, we found no support that predators changed pathogen transmission dynamics. Our combination of field and lab experiments to examine both sides of these interactions is unique in these communities and our results point to interesting scenarios playing out in natural and agricultural systems. AJF designed the experiments, conducted field and lab studies, and wrote the manuscript. TAC provided insects, advised in insect rearing and experimental use, and made substantial edits to the manuscript. BDE advised in designing the experiment, assisted with field work, and advised writing of the manuscript. Elec
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