1,720,993 research outputs found
Pesticide measurements made by Environment and Climate Change Canada in Ontario - cleaned raw data
No full textWe have cleaned and formatted the raw data provided by Environment and Climate Change Canada (ECCC) on the pesticides measured in aquatic ecosystems in Ontario from 2002 to 2016. The original raw data were extracted from Environment and Climate Change Canada "National Long-term Water Quality Monitoring Data dataset
Parental exposure of the freshwater snail Planorbella pilsbryi to copper results in transgenerational effects in offspring
No full textRaw data for manuscript titled "Parental exposure of the freshwater snail Planorbella pilsbryi to copper results in transgenerational effects in offspring"
Does size matter? Exploring trade-offs in reproduction, growth, and life history in the freshwater snail Planorbella pilsbryi
No full textRaw for manuscript titled "Does size matter? Exploring trade-offs in reproduction, growth, and life history in the freshwater snail Planorbella pilsbryi"
Development of an embryo toxicity test to assess the comparative toxicity of metal exposure on different life stages of freshwater gastropods
No full textEarly life stages are commonly thought to be highly sensitive to environmental contaminants and may offer insight into the future health of a population. Despite the importance of studying early life stages, very few standard protocols for benthic invertebrates commonly used in ecotoxicological assessments measure developmental endpoints. The goal of the present study was to develop and optimize a robust standard protocol for studying embryonic endpoints in freshwater gastropods. The developed method was then used to characterize the sensitivity of numerous embryonic endpoints (viability, hatching, deformities, and biomass production), in conjunction with juvenile and adult mortality, for the snail Planorbella pilsbryi exposed to a suite of metals (Cu, Cd, & Ni). Biomass production was typically the most sensitive endpoint but was relatively variable while embryo hatching was slightly less sensitive but highly consistent for all three metals. However, no single embryonic endpoint was consistently the most sensitive which demonstrates the importance of assessing a broad range of endpoints, life stages, and organisms in ecotoxicological risk assessment. Interestingly, the embryonic life stage of P. pilsbryi was considerably less sensitive to Cu exposure compared with juvenile and adult mortality. However, for Cd exposure, embryonic endpoints were the most sensitive and for Ni exposure were similarly sensitive to juvenile and adult mortality. This study has valuable applications in conducting developmental toxicity research with organisms lacking standardized testing protocol as well as future applications in multi-generational and in silico toxicity research
Assessing the energetic cost of exposure to copper in a freshwater gastropod
No full textRaw data from manuscript titled "Assessing the energetic cost of exposure to copper in a freshwater gastropod"
Investigating factors within the parental environment that influence the fitness of a freshwater gastropod species and their sensitivity to metal exposure
Get PDFRelated dataset: Prosser, Ryan; Osborne, Rebecca, 2023, "Does size matter? Exploring trade-offs in reproduction, growth, and life history in the freshwater snail Planorbella pilsbryi", https://doi.org/10.5683/SP3/PH1NPS, Borealis, V1.Related dataset: Prosser, Ryan; Osborne, Rebecca, 2023, "Development of an embryo toxicity test to assess the comparative toxicity of metal exposure on different life stages of freshwater gastropods", https://doi.org/10.5683/SP3/PUFII5, Borealis, V1.Related dataset: Prosser, Ryan; Osborne, Rebecca, 2023, "Parental exposure of the freshwater snail Planorbella pilsbryi to copper results in transgenerational effects in offspring", https://doi.org/10.5683/SP3/ER7Z54, Borealis, V1.Related dataset: Prosser, Ryan; Osborne, Rebecca, 2023, "Bioaccumulation and maternal transfer of copper in the freshwater snail Planorbella pilsbryi", https://doi.org/10.5683/SP3/OIRZKM, Borealis, V1.Related dataset: Prosser, Ryan; Osborne, Rebecca, 2023, "Assessing the energetic cost of exposure to copper in a freshwater gastropod", https://doi.org/10.5683/SP3/F8KZJC, Borealis, V1.To effectively assess and manage the risks posed by chemicals in the environment, toxicological data must accurately represent the adverse effects that may occur in environmentally relevant exposure scenarios. An increasing weight of evidence suggests that certain chemicals can cause lasting adverse outcomes on populations long after the initial exposure had ended. These latent or transgenerational effects may alter the fitness of subsequent generations of organisms without direct exposure. To understand the influence of the parental environment, including exposure history, as a factor in offspring fitness and sensitivity to metals, the life history of the model gastropod Planorbella pilsbryi was thoroughly characterized. Organism sensitivity to metals was established and compared with the sensitivity of juveniles born to Cu-exposed parents. It was found that juveniles born to Cu-exposed parents were significantly more sensitive to subsequent Cu exposures than offspring born to unexposed parents. Mechanistic investigations of the bioaccumulation and direct maternal transfer of Cu indicated that maternal transfer of Cu to egg masses did correspond with trends in transgenerational effects. However, investigations of altered energy budgets and stress responses as mechanisms of the documented transgenerational effects were inconclusive.2024-12-0
Terrestrial isopods generate microplastics from high-density polyethylene without effects on survival
No full textRaw data from study on terrestrial isopods generate microplastics from high-density polyethylene without effects on survival
Toxicity of 6PPD to freshwater invertebrates
No full textRaw data from toxicity tests with Hexagenia spp., Daphnia magna, Planorbella pilsbryi embryos exposed to 6PPD-quinone
An assessment of the toxicity of pesticide mixtures in periphyton from agricultural streams to the mayfly Neocloeon triangulifer
No full textOntario’s streams are susceptible to pesticide pollutants which are transported outside of the intended area of application from surrounding agricultural fields. Periphyton are a vital dietary component for grazing organisms in aquatic ecosystems but can also accumulate substantial levels of pesticides from the surrounding water. Consequently, grazing aquatic organisms are likely subjected to pesticide exposure through the consumption of pesticide contaminated periphyton. The objectives of this study were to determine if pesticides partition into periphyton in riverine environments across Southern Ontario, and if so, to determine the toxicity of pesticides in periphyton when fed to the grazing mayfly Neocloeon triangulifer. Ten sites across Southern Ontario were sampled between May-September 2021. Sites with low, medium, and high pesticide exposure based on historic water quality monitoring data were selected to incorporate a pesticide exposure gradient into the study design. Artificial substrate samplers were utilized to colonize periphyton in situ, which was then analyzed for the presence of ~500 pesticides. Results from this study demonstrate that periphyton is capable of accumulating pesticides in agricultural streams. A novel, 7-day toxicity test method was created to investigate the effects of pesticides partitioned into periphyton when fed to N. triangulifer. Periphyton collected from the field sites were fed to N. triangulifer and survival and biomass production were recorded. Survival and biomass production significantly decreased when fed periphyton colonized in streams with catchments dominated by agricultural land use (p<0.05). However, the relationship observed between pesticide concentration and survival or biomass production was not consistent. Using field colonized periphyton allowed us to assess dietary toxicity of environmentally relevant concentrations of pesticide mixtures, however nutrition and taxonomic composition of the periphyton may vary between sites. We recommend future research to simulate individual pesticide exposures to periphyton in the laboratory prior to performing these novel dietary toxicity assessments
Characterizing the Microplastic Content of Biosolids in Southern Ontario - raw data
No full textThe raw data from a study on the microplastic content of biosolids collected from Southern Ontario. The title of the associated manuscript is "Characterizing the Microplastic Content of Biosolids in Southern Ontario"
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