TY - JOUR
T1 - Ecological risk assessment of imidacloprid applied to experimental rice fields
T2 - Accurateness of the RICEWQ model and effects on ecosystem structure
AU - Pereira, Ana Santos
AU - José Cerejeira, Maria
AU - Daam, Michiel A.
N1 - Sem PDF.
Portuguese government through the Fundacao para a Ciencia e Tecnologia (FCT)
(UID/AGR/04129/2013; PTDC/AGR-AAM/105459/2008; SFRH/BD/89098/2012;
SFRH/BPD/109199/2015)
PY - 2017/8
Y1 - 2017/8
N2 - The fate of imidacloprid and its potential side-effects on biological communities and ecosystem functioning was studied in experimental rice plots. In addition, the influence of applying a withholding period of zero days (actual practices) and seven days (recommended in EU) on this was evaluated. Predicted environmental concentrations (PEC) of imidacloprid calculated with the higher-tier model RICEWQ agreed well with concentrations measured in the field. Methodologies generally used in the EU and USA for lower-tier PEC calculation, however, severely underestimated actual field concentrations and hence appear to need further evaluation and eventually amendments. Effects on several biological communities (especially ostracods, dipterans and coleopterans) were noted following imidacloprid application, with greatest effects in the paddy were as applied a withholding period of 7 days. An increase in the density of snails (Physa acuta), however, may have prevented effects on ecosystem functioning through functional redundancy. Implications of study findings for the ecological risk assessment of imidacloprid and potential mitigation measures are discussed.
AB - The fate of imidacloprid and its potential side-effects on biological communities and ecosystem functioning was studied in experimental rice plots. In addition, the influence of applying a withholding period of zero days (actual practices) and seven days (recommended in EU) on this was evaluated. Predicted environmental concentrations (PEC) of imidacloprid calculated with the higher-tier model RICEWQ agreed well with concentrations measured in the field. Methodologies generally used in the EU and USA for lower-tier PEC calculation, however, severely underestimated actual field concentrations and hence appear to need further evaluation and eventually amendments. Effects on several biological communities (especially ostracods, dipterans and coleopterans) were noted following imidacloprid application, with greatest effects in the paddy were as applied a withholding period of 7 days. An increase in the density of snails (Physa acuta), however, may have prevented effects on ecosystem functioning through functional redundancy. Implications of study findings for the ecological risk assessment of imidacloprid and potential mitigation measures are discussed.
KW - Ecological risk assessment
KW - Fate modelling
KW - Neonicotinoid
KW - Rice
UR - http://www.scopus.com/inward/record.url?scp=85018784747&partnerID=8YFLogxK
U2 - 10.1016/j.ecoenv.2017.04.045
DO - 10.1016/j.ecoenv.2017.04.045
M3 - Article
C2 - 28456129
AN - SCOPUS:85018784747
SN - 0147-6513
VL - 142
SP - 431
EP - 440
JO - Ecotoxicology and Environmental Safety
JF - Ecotoxicology and Environmental Safety
ER -