Infective prey leads to a partial role reversal in a predator-prey interaction

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Kaitala , V , Koivu-Jolma , M & Laakso , J 2021 , ' Infective prey leads to a partial role reversal in a predator-prey interaction ' , PLoS One , vol. 16 , no. 9 , 0249156 .

Title: Infective prey leads to a partial role reversal in a predator-prey interaction
Author: Kaitala, Veijo; Koivu-Jolma, Mikko; Laakso, Jouni
Contributor organization: Organismal and Evolutionary Biology Research Programme
Doctoral Programme in Wildlife Biology
Veijo Kaitala / Principal Investigator
Faculty of Biological and Environmental Sciences
Department of Physics
Date: 2021-09-17
Language: eng
Number of pages: 18
Belongs to series: PLoS One
ISSN: 1932-6203
Abstract: An infective prey has the potential to infect, kill and consume its predator. Such a prey-predator relationship fundamentally differs from the predator-prey interaction because the prey can directly profit from the predator as a growth resource. Here we present a population dynamics model of partial role reversal in the predator-prey interaction of two species, the bottom dwelling marine deposit feeder sea cucumber Apostichopus japonicus and an important food source for the sea cucumber but potentially infective bacterium Vibrio splendidus. We analyse the effects of different parameters, e.g. infectivity and grazing rate, on the population sizes. We show that relative population sizes of the sea cucumber and V. Splendidus may switch with increasing infectivity. We also show that in the partial role reversal interaction the infective prey may benefit from the presence of the predator such that the population size may exceed the value of the carrying capacity of the prey in the absence of the predator. We also analysed the conditions for species extinction. The extinction of the prey, V. splendidus, may occur when its growth rate is low, or in the absence of infectivity. The extinction of the predator, A. japonicus, may follow if either the infectivity of the prey is high or a moderately infective prey is abundant. We conclude that partial role reversal is an undervalued subject in predator-prey studies.
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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