Competition increases toxicant sensitivity and delays the recovery of two interacting populations

Foit, Kaarina; Kaske, Oliver; Liess, Matthias

doi:10.1016/j.aquatox.2011.09.012

Cited by 57 publications

(66 citation statements)

References 42 publications

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“…Such processes have been previously observed when competing populations with contrasting sensitivities co-occur. 12,13 In our experiment, this is shown by the negative relationship between the abundance of Culex pipiens larvae and the biomass of Daphnia magna (Figure 3). …”

Section: Discussionsupporting

confidence: 51%

Culmination of Low-Dose Pesticide Effects

Liess¹,

Foit²,

Becker³

et al. 2013

Environ. Sci. Technol.

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Pesticides applied in agriculture can affect the structure and function of nontarget populations at lower doses and for longer timespans than predicted by the current risk assessment frameworks. We identified a mechanism for this observation. The populations of an aquatic invertebrate (Culex pipiens) exposed over several generations to repeated pulses of low concentrations of the neonicotinoid insecticide (thiacloprid) continuously declined and did not recover in the presence of a less sensitive competing species (Daphnia magna). By contrast, in the absence of a competitor, insecticide effects on the more sensitive species were only observed at concentrations 1 order of magnitude higher, and the species recovered more rapidly after a contamination event. The underlying processes are experimentally identified and reconstructed using a simulation model. We conclude that repeated toxicant pulse of populations that are challenged with interspecific competition may result in a multigenerational culmination of low-dose effects.

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Section: Discussionsupporting

confidence: 51%

Culmination of Low-Dose Pesticide Effects

Liess¹,

Foit²,

Becker³

et al. 2013

Environ. Sci. Technol.

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“…Some studies have indicated that reduced brood size and increased time to reproductive maturity may not perturb intrinsic growth rate of the population (Kim et al, 2008). However, most studies indicate that perturbations in reproduction may take 1–3 generations for recovery (Liess et al, 2006; Pieters and Liess, 2006) and even longer (5 or more generations) if there are other stressors such as a population in stasis, poor nutrition, competition, or delayed life history events (Liess et al, 2006; Foit et al, 2012). Competition for resources by non-reproducing males and delayed reproduction are both concerns with pyriproxyfen.…”

Section: Discussionmentioning

confidence: 99%

The time- and age-dependent effects of the juvenile hormone analog pesticide, pyriproxyfen on Daphnia magna reproduction

Ginjupalli

Baldwin

2013

Chemosphere

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Pyriproxyfen is an insecticidal juvenile hormone analog that perturbs insect and tick development. Pyriproxyfen also alters parthenogenic reproduction in non-target cladoceran species as it induces male production that can lead to a decrease in fecundity, a reduction in population density, and subsequent ecological effects. In this study, we investigate the impacts of pyriproxyfen on Daphnia magna reproduction using a series of male production screening assays. These assays demonstrate that pyriproxyfen increases male production in a concentration-dependent fashion with an EC50 of 156 pM (50.24 ng L-1); a concentration considered environmentally relevant. Furthermore, pyriproxyfen decreases overall fecundity at all ages tested (7, 14, 21-d old female parthenogenic daphnids). Juvenile (3-d old) and reproductively mature (10-d old) female daphnids were also exposed to 155 pM pyriproxyfen for 2 – 12 d and reproduction measured for 16 d to compare the effects of short-term and prolonged exposures, and determine the potential for recovery. Results indicate that longer pyriproxyfen exposures (8–12 d) extend male production and decrease reproduction; however, daphnids exposed for only 2–4 d recover and produce a relatively normal abundance of neonates. In addition, juvenile daphnids are also very sensitive to pyriproxyfen, but the primary effect on juvenile daphnids is reduced reproduction and protracted development not male production. Taken together, continued use of pyriproxyfen around water bodies needs due caution because of its potential adverse effects with significant developmental delays and male production compounded by prolonged exposure.

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“…Environmental stress may alter effects of toxicants on populations and communities by a factor of more than 10. Examples include investigations by Foit et al (2012), Knillmann et al (2012a), ), Reynaldi et al (2011. In addition to the effect, recovery may also be influenced (Foit et al, 2012;Knillmann et al, 2012b).…”

Section: Uncertainties In Extrapolating To Real Field Situationsmentioning

confidence: 99%

Guidance on tiered risk assessment for plant protection products for aquatic organisms in edge‐of‐field surface waters

2013

EFS2

358

261

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EFSA's Panel on Plant Protection Products and their Residues (PPR) was tasked to revise the Guidance Document (GD) on Aquatic Ecotoxicology under Council Directive 91/414/EEC (SANCO/3268/2001 rev.4 (final), 17 October 2002. This Guidance of the PPR Panel is the first of three requested deliverables within this mandate. It has its focus on tiered acute and chronic effect assessment schemes with detailed guidance on tier 1 and higher tier effect assessments for aquatic organisms in edge-of-field surface waters and on proposals regarding how to link effects to exposure estimates. The exposure assessment methodology was not reviewed and it is assumed that the current FOCUS surface water exposure assessment methodology will continue to be used for exposure assessment at EU level. The current GD is intended to be used for authorisation of active substances at EU level as well as for plant protection products at Member State level. The effect assessment schemes in this GD allow for the derivation of regulatory acceptable concentrations (RACs) on the basis of two options: (1) the ecological threshold option (ETO), accepting negligible population effects only, and (2) the ecological recovery option (ERO), accepting some population-level effects if ecological recovery takes place within an acceptable time period. In the tiered effect assessment schemes, in principle, all tiers (1, 2 and 3) are able to address the ETO, while the model ecosystem approach (tier 3), under certain conditions, is able to also address the ERO. The GD provides the scientific background for the risk assessment to aquatic organisms in edge-of-field surface waters and is structured to give detailed guidance on all assessment steps. An executive summary joining all parts of the guidance and decision schemes in a concise way is provided and is intended to help applicants and regulatory authorities in day-to-day use. (2) the revision of the related data requirements and (3) scientific developments. Stakeholders were consulted before the start of the revision process in a public consultation, as well as risk managers in a specific consultation, in October to December 2008. The revision of the Guidance Document on Aquatic Ecotoxicology was started in parallel to the revision of the Guidance Document on Terrestrial Ecotoxicology (SANCO/10329/2002(SANCO/10329/ , rev.2 final, 17.10.2002 EC, 2002b) to allow a harmonisation process. As a first step, the PPR Panel developed a framework for deriving specific protection goals (EFSA PPR Panel, 2010a). The approach outlined in that opinion was the starting point for the development of this updated Guidance Document on aquatic risk assessment (RA).The aquatic RA is the combination of the exposure and the effect assessments and there is considerable interaction between these assessments. The focus of this Guidance Document (GD) is on a tiered effect assessment scheme with detailed guidance on tier 1 and higher tier effect assessments that are mainly based on experimental approaches (chapters 7-10). A sc...

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Competition increases toxicant sensitivity and delays the recovery of two interacting populations

Cited by 57 publications

References 42 publications

Culmination of Low-Dose Pesticide Effects

Culmination of Low-Dose Pesticide Effects

The time- and age-dependent effects of the juvenile hormone analog pesticide, pyriproxyfen on Daphnia magna reproduction

Guidance on tiered risk assessment for plant protection products for aquatic organisms in edge‐of‐field surface waters

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