Bioavailability and Ecotoxicology
Summary
Bioavailability and ecotoxicology intersect to determine how chemical substances released into the environment become accessible to organisms and elicit adverse effects across biological and ecological scales. Bioavailability describes the fraction of a contaminant that is free to move into an organism—whether as dissolved ions, molecules or particulate forms—and initiate toxic responses. Ecotoxicology investigates these responses in individual species, populations and communities, integrating molecular, organismal and ecosystem‐level endpoints. Factors such as chemical speciation, particle size and coating, water chemistry, temperature and organic matter content govern contaminant fate, transport and transformation, thereby modulating bioavailability. Uptake pathways include passive diffusion of dissolved species, endocytosis of particles and direct contact at membrane interfaces. Following uptake, mode‐of‐action mechanisms—oxidative stress, membrane disruption, endocrine interference, metabolic reprogramming—determine toxicity outcomes. Contemporary research combines advanced analytical imaging, high‐throughput molecular assays and predictive modelling to characterise exposure–dose–response relationships under realistic conditions, supporting evidence‐based regulation and design of safer chemicals. The global expansion of novel materials (nanomaterials, microplastics) and legacy pollutants (organotins, heavy metals) underscores the importance of multidisciplinary ecotoxicology in safeguarding ecosystems and human health.
Research from Nature Portfolio
Short-term exposure to triphenyltin in the silkworm Bombyx mori perturbed midgut microbial diversity and metabolic functions, as revealed by 16S rDNA sequencing and functional gene analysis. Alterations in key genera and up-regulation of pathways for lipid and carbohydrate metabolism indicated that particle form and solubility critically influence gut microbiota homeostasis and, by extension, organismal health under environmental contamination. In a pioneering aquatic food-chain investigation, gold nanomaterials of defined shapes and sizes were traced from algae through Daphnia to fish. Particle number‐based imaging and dissolution assays demonstrated that small or high-aspect-ratio nanomaterials underwent enhanced dissolution and agglomeration in daphnid guts, driving differential biodistribution in fish tissues. The brain consistently accumulated the highest particle counts, emphasising the central role of physicochemical properties in governing trophic transfer efficiencies and organ‐specific accumulation under environmentally relevant exposures.
Bioavailability and Ecotoxicology publication trend
The graph below shows the total number of articles in bioavailability and ecotoxicology across all publications each year (not limited to Nature Index journals).
Technical terms
Bioavailability: The proportion of a chemical form—dissolved or particulate—that is free to interact with an organism’s biological surfaces and cause toxicity.
Ecotoxicology: The study of adverse effects of chemicals on organisms, populations and ecosystems.
Trophic transfer: The movement and accumulation of substances through successive levels of a food web.
Heteroaggregation: The process by which different types of particles adhere to one another, affecting transport, fate and exposure in aquatic environments.
Physico-chemical transformation: The suite of processes—dissolution, agglomeration, surface modification—that alter a contaminant’s form and hence its bioavailability.
References
- Short-term triphenyltin exposure alters microbial homeostasis in the silkworm (Bombyx mori) midgut. Scientific Reports (2023).
- Particle number-based trophic transfer of gold nanomaterials in an aquatic food chain. Nature Communications (2021).
- Heteroaggregation and sedimentation of natural goethite and artificial Fe3O4 nanoparticles with polystyrene nanoplastics in water. Carbon Research (2024).
- Trophic transfer of silver nanoparticles shifts metabolism in snails and reduces food safety. Environment International (2023).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.