{"id":41946,"date":"2026-06-26T00:01:01","date_gmt":"2026-06-26T04:01:01","guid":{"rendered":"https:\/\/beyondpesticides.org\/dailynewsblog\/?p=41946"},"modified":"2026-06-25T13:46:15","modified_gmt":"2026-06-25T17:46:15","slug":"elevated-toxicity-of-naturally-occurring-cyanobacteria-provoked-by-pesticide-threatens-aquatic-organisms","status":"publish","type":"post","link":"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/06\/elevated-toxicity-of-naturally-occurring-cyanobacteria-provoked-by-pesticide-threatens-aquatic-organisms\/","title":{"rendered":"Elevated Toxicity of Naturally Occurring Cyanobacteria Provoked by Pesticide Threatens Aquatic Organisms"},"content":{"rendered":"<p>(<em>Beyond Pesticides<\/em>, June 26, 2026) In a study published in <a href=\"https:\/\/doi.org\/10.1016\/j.aquatox.2026.107741\"><em>Aquatic Toxicology<\/em><\/a>, researchers in Brazil determined that the cumulative toxicity of acetamiprid (a neonicotinoid insecticide) and cyanobacteria (photosynthetic microbes that can produce toxins) has a synergistic effect on the health of aquatic water fleas, or <em>Daphnia<\/em>. The implications of these findings paint a troubling picture for broader aquatic food webs, as they serve as a bridge species across trophic levels, serving as a primary consumer of plants and algae while also providing energy to secondary and tertiary consumers up the chain. In this context, public health and environmental advocates argue that the combined toxicity of synthetic agrichemicals and naturally occurring toxins is often considered an externality (external cost) borne by the public rather than a direct cost of agricultural production or nonagricultural pest management.<\/p>\n<p>\u201cWhen ecosystems are undermined, so are the economic systems that are relied upon to grow food,\u201d says Max Sano, senior policy and coalitions associate at Beyond Pesticides. \u201cThe need for a wholesale transition to organic land management acknowledges this fundamental mismatch and seeks to account for these discrepancies, although policy must ensure that organic farmers have the resources they need to thrive.\u201d<\/p>\n<h2>Methodology and Main Findings<\/h2>\n<p>The goal of this study is to examine the chronic impacts of singular and cumulative toxicity of acetamiprid and the cyanobacterium (<em>Raphidiopsis raciborskii<\/em> strain LETC-CY-05). This strain is known to produce <a href=\"https:\/\/www.sciencedirect.com\/topics\/neuroscience\/saxitoxin\">saxitoxin<\/a>, a toxin that can contribute to \u201cred tide\u201d algal blooms, disrupting entire aquatic ecosystems if not properly managed. In the study, researchers test two species of Daphnia, one kept in lab culture for approximately 30 years (<em>D. similis<\/em>) and one found in Lake Jacar\u00e9 in Minas Gerais, Brazil (D. laevis). The test organisms were exposed for a 15-day period with sublethal exposure concentrations set below the observed lethal range. The combined toxicity of cyanobacterium and acetamiprid is analyzed using the MIXTOX model (Jonker et al., 2005) to consider synergistic interactions based on differences between estimated and observed values.<\/p>\n<p>The study yields the following main findings:<\/p>\n<ul>\n<li><strong>Reproductive Health Implications.<\/strong> For one of the test species of aquatic organisms (<em>D.<\/em><em>\u00a0similis<\/em>), the combined exposure delays the first reproduction cycle and cuts total offspring by 60 to 90 percent. For <em>D.laevis<\/em>, it is only acetamiprid as an isolated compound that impacts reproductive health and population growth.<\/li>\n<li><strong>Combined Exposure Shows Non-Linear Interactions.<\/strong> A 1:1 mixture of cyanobacteria and acetempairid is synergistic and kills all <em>D. <\/em><em>similis<\/em> organisms, whereas for D.laevis, \u201cthis occurred at 1:1 and 2:1 proportions.\u201d As the abstract points out, \u201cThese results demonstrate that the interaction between acetamiprid and cyanobacteria can lead to enhanced toxicity in zooplankton, underscoring the importance of assessing multiple stressors and their interactive effects in aquatic ecosystems, as single-exposure assessments may fail to capture the full scope of ecological risks.\u201d<\/li>\n<li><strong>Complementary Modes of Actions. <\/strong>Acetamiprid is shown to disrupt nicotinic acetylcholine receptors (nAChRs) while saxitoxins, as produced by certain cyanobacteria, can block voltage-gated sodium channels. The combined impacts of this exposure can potentially compound both membrane disruption and oxidative stress in aquatic organisms. For previous studies cited by the authors on chemical interaction-enhancing cyanobacteria toxicity, see <a href=\"https:\/\/doi.org\/10.1016\/j.algal.2024.103876\">here<\/a> and <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0166445X26000378?via%3Dihub#bib0011\">here<\/a>.<\/li>\n<\/ul>\n<h2>Previous Coverage<\/h2>\n<p>There is a large body of peer-reviewed research documenting the synergistic effects and enhanced toxicity of chemical mixtures, including those with naturally occurring toxins, that requires assessment when allowing the application of synthetic agrichemicals into the environment.<\/p>\n<p>A review published in\u00a0<a href=\"https:\/\/www.mdpi.com\/2305-6304\/14\/5\/373\"><strong><em>Toxics<\/em><\/strong><\/a> finds that per- and polyfluoroalkyl substances (PFAS) can heighten the risks of environmental contaminants to exposed organisms. Mixtures of these compounds can negatively impact the nervous, cardiovascular, immune, and reproductive systems, particularly in <a href=\"https:\/\/www.beyondpesticides.org\/programs\/wildlife\/fish\">aquatic organisms<\/a>, and threaten overall\u00a0<a href=\"https:\/\/www.beyondpesticides.org\/programs\/biodiversity\">biodiversity<\/a>. \u201cThe objectives were to evaluate the toxicological effects of mixtures of the selected contaminants with PFAS on aquatic organisms to understand biological responses in animals better,\u201d the study authors explain. \u201cBased on our review, data suggest that PFAS can modify the toxicity of co-occurring pollutants.\u201d (See <em>Daily News <\/em><a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/05\/literature-review-documents-enhanced-toxicity-of-chemical-mixtures-in-aquatic-organisms-with-pfas-exposure\/\">here<\/a>.) Research also finds that widespread agricultural pesticide use increases chronic dietary exposure in poultry and leads to adverse <a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/category\/diseasehealth-effects\/reproductive-health\/\">reproductive effects<\/a>, despite meeting legal residue limits. As published in\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0032579126000192\"><em>Poultry Science<\/em><\/a>\u00a0by researchers at <a href=\"https:\/\/www.google.com\/maps\">Wroc\u0142aw University of Environmental and Life Sciences<\/a> (Wroc\u0142aw, Poland), low-dose pesticide exposure of harmed the reproductive system of roosters (<em>Gallus gallus domesticus<\/em>) exposed to the fungicide\u00a0<a href=\"https:\/\/www.beyondpesticides.org\/resources\/pesticide-gateway?pesticideid=282\">tebuconazole<\/a>\u00a0(TEB), the insecticide\u00a0<a href=\"https:\/\/www.beyondpesticides.org\/resources\/pesticide-gateway?pesticideid=39\">imidacloprid<\/a>\u00a0(IMI), and the weed killer\u00a0<a href=\"https:\/\/www.beyondpesticides.org\/resources\/pesticide-gateway?pesticideid=37\">glyphosate<\/a>\u00a0(GLP) individually and\u00a0<a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/category\/pesticide-mixtures\/\">in mixtures<\/a>, with all concentrations at or below the maximum residue limits (MRLs) established by the European Union (EU). \u201cSub-MRL pesticide exposure impaired male reproductive function, with the most pronounced effects observed following combined treatments,\u201d the authors report. They continue: \u201c[E]xposure resulted in reduced semen quality, decreased fertility and hatchability, and increased embryo mortality, particularly in groups receiving IMI alone or in combination. These functional impairments were accompanied by detectable pesticide residues in reproductive tissues and body fluids, as well as modulation [modification\/alteration] of local and systemic immune parameters.\u201d (See <em>Daily News <\/em><a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/02\/dietary-exposure-of-poultry-to-common-pesticide-mixtures-threatens-reproductive-health-study-finds\/\">here<\/a>.)<\/p>\n<p>These synergistic risks are not reflected in regulatory systems in the United States, according to recent scientific reports.\u00a0In\u00a0<a href=\"https:\/\/pubs.acs.org\/doi\/full\/10.1021\/acs.chemrestox.5c00375\"><em>Chemical Research in Toxicology<\/em><\/a>, for example, researchers from the\u00a0<a href=\"https:\/\/www.urv.cat\/en\/\">Universitat Rovira i Virgili<\/a> (Catalonia, Spain) highlight the threats to human and environmental health with \u201ccombined exposures to multiple chemical toxicants, including industrial chemicals, heavy metals, pesticides, endocrine-disrupting chemicals (EDCs), and per- and polyfluoroalkyl substances (PFAS).\u201d As the authors point out, \u201cThis leads to a systematic underestimation of health risks, particularly for vulnerable populations. Despite robust evidence on mixture toxicity, major regulatory frameworks such as the U.S. Toxic Substances Control Act (TSCA) and the EU\u2019s [European Union] REACH [Registration, Evaluation, Authorisation and Restriction of Chemicals] program continue to assess chemicals in isolation.\u201d (See <em>Daily News <\/em><a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/04\/review-identifies-regulatory-deficiencies-in-the-risk-assessments-of-chemical-mixtures-including-pesticides\/\">here<\/a>.)<\/p>\n<p>On the topic of the failures of the current U.S. regulatory system, researchers studied the effect of multiple climate stressors and pesticides in the environment and published their disturbing findings of elevated harm in \u201c<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0304389425032133\">Double trouble: The synergistic threat of environmental stressors and pesticide mixtures<\/a>,\u201d\u00a0<em>Journal of Hazardous Materials<\/em>\u00a0(December, 2025). The researchers document synergism that is 70 times stronger than for the single chemical. The work is a follow-up to a\u00a0<a href=\"https:\/\/www.researchgate.net\/publication\/307937573_Predicting_the_synergy_of_multiple_stress_effects\">previous study<\/a> covered in Beyond Pesticides\u2019 October 25, 2024,\u00a0<a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2024\/10\/study-shows-climate-change-exacerbates-synergistic-effects-of-synthetic-pyrethroid-pesticide-threatens-biodiversity\/\">news brief<\/a>. Researchers at the\u00a0<a href=\"https:\/\/www.ufz.de\/\">Helmholtz Centre for Environmental Research<\/a>\u00a0in Leipzig and the Department of\u00a0<a href=\"https:\/\/www.bio.uni-frankfurt.de\/43970666\/Abt__Hollert\">Evolutionary Ecology and Environmental Toxicology<\/a>\u00a0at Goethe University in Frankfurt identify the interactions between two types of environmental stress\u2014food deprivation and heat stress\u2014and pesticides, both individually and in mixtures. In their laboratory study, the researchers exposed the water flea <em>Daphnia magna<\/em>, a tiny crustacean, to both types of stress in combination with exposure to the pyrethroid insecticide\u00a0<a href=\"https:\/\/www.beyondpesticides.org\/resources\/pesticide-gateway?pesticideid=149\">esfenvalerate<\/a> and a mixture of 13 other pyrethroids. The degree to which the combination of pesticides and climate stresses exacerbates damage to the\u00a0<em>Daphnia<\/em>\u00a0adds to the real-world hazards that are not captured in required regulatory reviews for pesticide registration by the U.S. Environmental Protection Agency. (See <em>Daily News <\/em><a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/01\/mixture-of-common-pesticide-and-environmental-stressors-dramatically-elevates-unregulated-adverse-effects\/\">here<\/a>.)<\/p>\n<p>Cumulative pesticide exposure is linked to numerous adverse health effects, including cancer. A novel study mapping\u00a0<a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/category\/pesticide-mixtures\/\">pesticide mixtures<\/a>\u00a0and\u00a0<a href=\"https:\/\/www.beyondpesticides.org\/resources\/pesticide-induced-diseases-database\/cancer\">cancer risk<\/a>, published earlier this year in\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s44360-026-00087-0\"><em>Nature Health<\/em><\/a>, \u201creveals a robust spatial association between environmental pesticide exposure risk and cancer incidence.\u201d The team of international researchers incorporates pesticide risk modeling with Peruvian National Cancer Institute (INEN) registry data to map pesticide-induced cancer clusters in Peru, finding significant associations between pesticide mixtures and cases of carcinogenicity. The study analyzes 31 active pesticide ingredients to identify pesticide-associated cancer hotspots, none of which are classified as carcinogenic on their own by international standards.\u00a0\u201cCollectively, these findings strongly support a mechanistic [causal] link between pesticide exposure and cancer, challenging assumptions of human non-carcinogenicity derived from reductionist experimental models,\u201d the authors state. \u201cThis study redefines the exposome [measure of all environmental, dietary, lifestyle, and social exposures of an individual] as a lineage-conditioned, mechanistically tractable framework and shows how complex pesticide mixtures can contribute to carcinogenic trajectories, with profound and far-reaching implications for global health policy and socio-ecological equity.\u201d (See <em>Daily News <\/em><a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/04\/pesticides-deemed-noncarcinogenic-show-cancer-causing-effects-when-combined-in-nature-landmark-study-finds\/\">here<\/a>.)<\/p>\n<p>There are also neurotoxic implications for the continuous use of synthetic pesticides. A study in <a href=\"https:\/\/link.springer.com\/article\/10.1007\/s44339-025-00042-w\"><em>Discover Toxicology<\/em><\/a>\u00a0highlights neurotoxic pollutants as significant environmental threats, showcasing the adverse impacts on vertebrates\u2019 neurological health from pesticides, including\u00a0<a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/category\/chemicals\/organophosphate\/\">organophosphates<\/a>,\u00a0<a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/category\/chemicals\/carbamates\/\">carbamates<\/a>, and\u00a0<a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/category\/chemicals\/organochlorines\/\">organochlorines<\/a>. \u201cThese substances disrupt normal neurophysiological functions by impairing neurotransmission, generating\u00a0<a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/category\/diseasehealth-effects\/oxidative-stress\/\">oxidative stress<\/a>, provoking neuroinflammation, and initiating neuronal cell death,\u201d the authors say. They continue, \u201cSuch disturbances are linked to cognitive deficits, motor impairments, and abnormal neural development.\u201d (See <em>Daily News <\/em><a href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/03\/pesticide-exposure-again-linked-to-neurotoxic-effects-in-humans-and-wildlife-in-comprehensive-review\/\">here<\/a>.)<\/p>\n<h2>Call to Action<\/h2>\n<p>You can all subscribe to receive the\u00a0<a href=\"https:\/\/secure.everyaction.com\/pwg2_EDS5EyIr4jA550SNw2\"><em>Action of the Week\u00a0<\/em>and\u00a0<em>Weekly News Update<\/em><\/a>\u00a0in your inbox so that you can take strategic actions calling for change from the local to international.<\/p>\n<p>For example, you can <a href=\"https:\/\/secure.everyaction.com\/SiWXvv8E00GkI8wKVJ6aAA2##anchor\">tell EPA, FDA, and Congress that regulations must consider the effects of pesticides in the context in which they are used and with reference to the organic alternative<\/a><a href=\"https:\/\/secure.everyaction.com\/SiWXvv8E00GkI8wKVJ6aAA2##anchor\"><em>.<\/em><\/a><\/p>\n<p><em>All unattributed positions and opinions in this piece are those of Beyond Pesticides. <\/em>\u00a0<\/p>\n<p>Source: <a href=\"https:\/\/doi.org\/10.1016\/j.aquatox.2026.107741\"><em>Aquatic Toxicology<\/em><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(Beyond Pesticides, June 26, 2026) In a study published in Aquatic Toxicology, researchers in Brazil determined that the cumulative toxicity of acetamiprid (a neonicotinoid insecticide) and cyanobacteria (photosynthetic microbes that can produce toxins) has a synergistic effect on the health of aquatic water fleas, or Daphnia. The implications of these findings paint a troubling picture for broader aquatic food webs, as they serve as a bridge species across trophic levels, serving as a primary consumer of plants and algae while also providing energy to secondary and tertiary consumers up the chain. In this context, public health and environmental advocates argue that the combined toxicity of synthetic agrichemicals and naturally occurring toxins is often considered an externality (external cost) borne by the public rather than a direct cost of agricultural production or nonagricultural pest management. \u201cWhen ecosystems are undermined, so are the economic systems that are relied upon to grow food,\u201d says Max Sano, senior policy and coalitions associate at Beyond Pesticides. \u201cThe need for a wholesale transition to organic land management acknowledges this fundamental mismatch and seeks to account for these discrepancies, although policy must ensure that organic farmers have the resources they need to thrive.\u201d Methodology and Main Findings [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":41949,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[325,375,1213,21,565,328,421,1],"tags":[1615,2341,2279,448,1055,2110,1453,976,2009,682,716,2409,2278,852],"class_list":["post-41946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-acetamiprid","category-aquatic-organisms","category-chemical-mixtures","category-chemicals","category-ecosystem-services","category-neonicotinoids","category-synergistic-effects","category-uncategorized","tag-bioaccumulation","tag-cumulative","tag-nations-waters","tag-neonicotinoids","tag-neonics","tag-pesticide-toxicity","tag-surface-water","tag-toxic","tag-toxicity","tag-water","tag-water-contamination","tag-water-flea","tag-water-quality","tag-waterways"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - 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