Transient recovery dynamics of a predator–prey system under press and pulse disturbances

BMC Ecology

Research Article

Karin Johst¹  Alexander Singer²  Canan Karakoç³  Antonis Chatzinotas⁴  Hauke Harms⁴ 

[1] Department of Ecological Modelling, Helmholtz Centre for Environmental Research-UFZ, Permoserstraße 15, 04318, Leipzig, Germany;Department of Ecological Modelling, Helmholtz Centre for Environmental Research-UFZ, Permoserstraße 15, 04318, Leipzig, Germany;Swedish Species Information Centre, Swedish University of Agricultural Sciences, P.O. Box 7007, 75007, Uppsala, Sweden;Department of Environmental Microbiology, Helmholtz Centre for Environmental Research-UFZ, Permoserstraße 15, 04318, Leipzig, Germany;Department of Environmental Microbiology, Helmholtz Centre for Environmental Research-UFZ, Permoserstraße 15, 04318, Leipzig, Germany;Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany;

关键词: Pulse disturbance;    Press disturbance;    Transient dynamics;    Recovery;    Trophic interactions;    Protist;    Bacteria;    Predation;    Prey release;    Food web;   

DOI  :  10.1186/s12898-017-0123-2

 received in 2016-08-20, accepted in 2017-03-17,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundSpecies recovery after disturbances depends on the strength and duration of disturbance, on the species traits and on the biotic interactions with other species. In order to understand these complex relationships, it is essential to understand mechanistically the transient dynamics of interacting species during and after disturbances. We combined microcosm experiments with simulation modelling and studied the transient recovery dynamics of a simple microbial food web under pulse and press disturbances and under different predator couplings to an alternative resource.ResultsOur results reveal that although the disturbances affected predator and prey populations by the same mortality, predator populations suffered for a longer time. The resulting diminished predation stress caused a temporary phase of high prey population sizes (i.e. prey release) during and even after disturbances. Increasing duration and strength of disturbances significantly slowed down the recovery time of the predator prolonging the phase of prey release. However, the additional coupling of the predator to an alternative resource allowed the predator to recover faster after the disturbances thus shortening the phase of prey release.ConclusionsOur findings are not limited to the studied system and can be used to understand the dynamic response and recovery potential of many natural predator–prey or host–pathogen systems. They can be applied, for instance, in epidemiological and conservational contexts to regulate prey release or to avoid extinction risk of the top trophic levels under different types of disturbances.

【 授权许可】

CC BY   
© The Author(s) 2017