A sensitivity analysis of pesticide concentrations in California Central Valley vernal pools

Sinnathamby, Sumathy; Minucci, Jeffrey M.; Denton, Debra L.; Raimondo, Sandy; Oliver, Leah M.; Yuan, Yongping; Young, Dirk F.; Hook, Jerry B.; Pitchford, Ann; Waits, Eric R.; Purucker, S. Thomas

doi:10.1016/j.envpol.2019.113486

Cited by 12 publications

(13 citation statements)

References 34 publications

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“…Unfortunately, as model complexity increases to allow for more realistic scenarios, so does the variability associated with its predictions. The Pesticide in Water Calculator, a model regularly used to estimate pesticide concentrations in surface and ground water, may predict concentrations that span >10 orders of magnitude using realistic estimates for over 50 parameters (Sinnathamby et al, 2020). As such, stakeholders should be prepared for modeled exposure estimates to span large ranges, and minimal monitoring data for validation.…”

Section: Uncertainty In Erasmentioning

confidence: 99%

Reality check: What can we expect from an ecological risk assessment of UV filters on coral reefs?

Raimondo

2024

Integr Envir Assess & Manag

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Section: Uncertainty In Erasmentioning

confidence: 99%

Reality check: What can we expect from an ecological risk assessment of UV filters on coral reefs?

Raimondo

2024

Integr Envir Assess & Manag

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“…Thus, weather patterns including spatial and temporal trends in temperature and precipitation were important in population model development (i.e., in estimation of vital rates). Data collected for population and spatial characteristics included density dependence, population size, metapopulation structure, movement, geographic range and habitat measures (features and classification/suitability) [1,5,8,24,31,32,34,35,[43][44][45][46][47] (see Table S2). Density dependence (e.g., based upon pond volume) was important to consider due to potential impact on fitness [35].…”

Section: Phase 2: Data Collectionmentioning

confidence: 99%

“…For example, climate changes could exacerbate impacts due to chemical exposure if the vernal pools do not get charged as frequently and/or may not stay inundated for as long [50]. Data acquired for chemical exposure includes estimated environmental concentrations from the Pesticide Water Calculator (PWC version 1.59), which has been used to predict temporal trends of organophosphate pesticide concentrations (including diazinon and malathion) in three CA vernal pools based upon exposure duration and representative of nearby crop application [8]. Chemical effects characteristics included representation of toxic effects using standard crustacean surrogates (e.g., Daphnia magna, Thamnocephalus platyurus) and examination of effects by life stage or size as well as exposure route [4,7,8,[15][16][17][18][19][51][52][53][54][55][56][57] (see Table S4).…”

Section: Phase 2: Data Collectionmentioning

confidence: 99%

“…Many vernal pools are in or near agricultural areas, and may be exposed to pesticides via runoff, drift, and direct spray. Pesticides can enter vernal pool systems as wet deposition via rainfall, or as surface water loads from adjacent agricultural lands [8][9][10][11][12]. Using a weight of evidence community-level approach, Raimondo et al (2019) demonstrated that for insecticides, targeting protections to the vernal pool fairy shrimp and its habitat would also afford protections from future effects to the community of listed species and ecosystem services associated with this habitat [4].…”

Section: Introductionmentioning

confidence: 99%

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Investigating Vernal Pool Fairy Shrimp Exposure to Organophosphate Pesticides: Implications for Population-Level Risk Assessment

et al. 2022

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Vernal pool fairy shrimp, Branchinecta lynchi, is a freshwater crustacean endemic to California and Oregon, including California’s Central Valley. B. lynchi is listed as a Federally Threatened species under the US Endangered Species Act, and as a vulnerable species on the IUCN Red List. Threats that may negatively impact vernal pool fairy shrimp populations include pesticide applications to agricultural land use (e.g., agrochemicals such as organophosphate pesticides) and climate changes that impact vernal pool hydrology. Pop-GUIDE (Population model Guidance, Use, Interpretation, and Development for Ecological risk assessment) is a comprehensive tool that facilitates development and implementation of population models for ecological risk assessment and can be used to document the model derivation process. We employed Pop-GUIDE to document and facilitate the development of a population model for investigating impacts of organophosphate pesticides on vernal pool fairy shrimp populations in California’s Central Valley. The resulting model could be applied in combination with field assessment and laboratory-based chemical analysis to link effects from pesticide exposure to adverse outcomes in populations across their range. B. lynchi has a unique intra-annual life cycle that is largely dependent upon environmental conditions. Future deployment of this population model should include complex scenarios consisting of multiple stressors, whereby the model is used to examine scenarios that combine chemical stress resulting from exposure to pesticides and climate changes.

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“…Screening models do not consider the influence of weather conditions, differences in soil topography, and product use patterns on different crops (USEPA, 2022a). On the other hand, a scenario‐dependent model includes data such as crop growth stages, soil properties, weather patterns, field hydrology, and pesticide use patterns and fate (Sinnathamby et al, 2020; Young & Fry, 2019). In general, scenario‐dependent models have been built for the regulatory agencies of the US (USEPA, 2022b) and the European Union (European Food Safety Authority [EFSA], 2013) in partnership with industry and academics, whereas for other countries, especially tropical regions, there is need for scientific knowledge development including potential adaptations especially regarding the development of local scenarios.…”

Section: Introductionmentioning

confidence: 99%

Qualitative analysis of the most locally relevant runoff and erosion parameters for constructing Brazilian scenarios

Casallanovo

Santos

Cione

et al. 2023

Integr Envir Assess & Manag

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Estimating exposure is one of the most important steps in an environmental risk analysis of crop‐protection products to nontarget organisms. Regulatory agencies such as the US Environmental Protection Agency (USEPA), Pest Management Regulatory Agency (PMRA), and European Food Safety Authority (EFSA) all use mathematical exposure models in their regulatory assessment process. Brazil has been discussing the adoption of the Pesticide in Water Calculator (PWC) to be applied in aquatic pesticide risk assessment. Therefore, a qualitative sensitivity analysis (Morris OAT method) was performed to understand which are the most important local parameters in the PWC to estimate environmental concentrations in surface water (EECSW). In addition, an exercise made up of two corn scenarios in two Brazilian regions was developed (Uberlândia [UDI] and Arapoti [ARA]). Two herbicides with different soil‐binding properties and modes of action were selected to estimate the EECSW. The results demonstrated that the parameters of importance were different for each site, probably the result of different soil characteristics and meteorological patterns. This outcome suggests that regulatory agencies should consider developing more than one scenario to account for different agricultural regions. For Herbicide 1, the EECSW for UDI were similar to US scenarios, whereas for ARA they were lower. For Herbicide 2, the EECSW for the UDI site was higher than most of the US scenarios, whereas at the ARA site, EECs were similar to four US scenarios and lower than the other six. Local data were used as a refinement, resulting in the decrease in the EECSW for both herbicides in the UDI site. For the ARA site, Herbicide 1 displayed a similar EECSW value, whereas for Herbicide 2, it was lower after the refinement. Overall, these results demonstrated the importance of developing local scenarios to provide more realism to estimate pesticide exposure from its agricultural use and may help regulators to determine and recommend mitigations regarding the use of crop‐protection products. Integr Environ Assess Manag 2023;00:1–11. © 2023 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).

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A sensitivity analysis of pesticide concentrations in California Central Valley vernal pools

Cited by 12 publications

References 34 publications

Reality check: What can we expect from an ecological risk assessment of UV filters on coral reefs?

Reality check: What can we expect from an ecological risk assessment of UV filters on coral reefs?

Investigating Vernal Pool Fairy Shrimp Exposure to Organophosphate Pesticides: Implications for Population-Level Risk Assessment

Qualitative analysis of the most locally relevant runoff and erosion parameters for constructing Brazilian scenarios

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