Realistic low-doses of two emerging contaminants change size distribution of an annual flowering plant population

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Patama , M , Belz , R G & Sinkkonen , A 2019 , ' Realistic low-doses of two emerging contaminants change size distribution of an annual flowering plant population ' , Ecotoxicology , vol. 28 , no. 7 , pp. 732-743 . https://doi.org/10.1007/s10646-019-02069-3

Title: Realistic low-doses of two emerging contaminants change size distribution of an annual flowering plant population
Author: Patama, Marjo; Belz, Regina G.; Sinkkonen, Aki
Contributor: University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Ecosystems and Environment Research Programme
Date: 2019-09
Language: eng
Number of pages: 12
Belongs to series: Ecotoxicology
ISSN: 0963-9292
URI: http://hdl.handle.net/10138/325592
Abstract: HHCB [1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta(g)-2-benzopyran] and 4-tert-octylphenol [4-(1,1,3,3-tetramethylbutyl)phenol] are widely used emerging contaminants that have the potential to cause adverse effects in the environment. The purpose of this study was to observe if and how environmentally realistic concentrations of these contaminants alter growth in plant populations. It was hypothesized that within an exposed Gypsophila elegans Bieb (annual baby's breath) population especially fast-growing seedlings are impaired even when the population mean is unaffected, and small doses can cause hormesis and, thus, an increase in shoot or root length. In a dose-response experiment, an experimental population of G. elegans was established (total 15.600 seeds, 50 seeds per replicate, 24 replicates per concentration, 5.2 seedlings/cm(2)) and exposed to 12 doses of HHCB or 4-tert-octylphenol. After five days, shoot and root length values were measured and population averages, as well as slow- and fast-growing subpopulations, were compared with unexposed controls. Growth responses were predominantly monophasic. HHCB seemed to selectively inhibit both root and shoot elongation among slow- and fast-growing individuals, while 4-tert-octylphenol selectively inhibited both root and shoot elongation of mainly fast-growing seedlings. The ED50 values (dose causing 50% inhibition) revealed that the slow-growing seedlings were more sensitive and fast-growing seedlings less sensitive than the average of all individuals. Although there was toxicant specific variation between the effects, selective toxicity was consistently found among both slow- and fast-growing plants starting already at concentrations of 0.0067 mu M, that are usually considered to be harmless. This study indicates that these contaminants can change size distribution of a plant population at low concentrations in the nM/mu M range.
Subject: 1172 Environmental sciences
1181 Ecology, evolutionary biology
Dose-response
Growth stimulation
Hormesis
Low toxin doses
Selective toxicity
SEWAGE-SLUDGE
CHEMICAL INTERFERENCE
RESOURCE COMPETITION
POLYCYCLIC MUSKS
COPPER-SULFATE
HORMESIS
GROWTH
STIMULATION
RESPONSES
WATER
Dose-response
Growth stimulation
Hormesis
Low toxin doses
Selective toxicity
SEWAGE-SLUDGE
CHEMICAL INTERFERENCE
RESOURCE COMPETITION
POLYCYCLIC MUSKS
COPPER-SULFATE
HORMESIS
GROWTH
STIMULATION
RESPONSES
WATER
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