Species interactions and chemical stress: combined effects of intraspecific and interspecific interactions and pyrene on Daphnia magna population dynamics

Environmental Toxicology and Chemistry
Karel P J ViaeneColin R Janssen

Abstract

Species interactions are often suggested as an important factor when assessing the effects of chemicals on higher levels of biological organization. Nevertheless, the contribution of intraspecific and interspecific interactions to chemical effects on populations is often overlooked. In the present study, Daphnia magna populations were initiated with different levels of intraspecific competition, interspecific competition, and predation and exposed to pyrene pulses. Generalized linear models were used to test which of these factors significantly explained population size and structure at different time points. Pyrene had a negative effect on total population densities, with effects being more pronounced on smaller D. magna individuals. Among all species interactions tested, predation had the largest negative effect on population densities. Predation and high initial intraspecific competition were shown to interact antagonistically with pyrene exposure. This was attributed to differences in population structure before pyrene exposure and pyrene-induced reductions in predation pressure by Chaoborus sp. larvae. The present study provides empirical evidence that species interactions within and between populations can alter the respo...Continue Reading

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Citations

Oct 7, 2015·Integrated Environmental Assessment and Management·Andreu RicoTheo Cm Brock
Oct 26, 2016·Environmental Toxicology and Chemistry·Dimitri Van de PerreKarel A C De Schamphelaere
Jun 5, 2016·Integrated Environmental Assessment and Management·Antonio FrancoRoman Ashauer
Jun 28, 2016·The Science of the Total Environment·Changyou WangGang Liu
Mar 16, 2017·Environmental Toxicology and Chemistry·Paul J Van den BrinkAndreu Rico
Feb 27, 2018·Environmental Toxicology and Chemistry·Dimitri Van de PerreKarel A C De Schamphelaere
Jan 2, 2021·The Science of the Total Environment·Hannah M LowesTamzin A Blewett
Mar 5, 2021·Environmental Science. Processes & Impacts·Yanfen HaoGuibin Jiang
May 13, 2021·Ecology and Evolution·Talles Bruno Oliveira Dos AnjosAndreu Rico

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