The effects of triclosan on microbial communities in different sources of water and sediments.

Triclosan is a widely used antimicrobial agent frequently detected in aquatic environments. Although its effects on environmental microorganisms have been extensively studied, findings often remain inconsistent due to variations in experimental setups and sediment characteristics. Comparative studies that assess microbial responses across different sediment types, however, are still scarce.

Assessing triclosan-induced direct and multi-trophic cascading effects in a sub-tropical freshwater ecosystem.

Triclosan, a synthetic broad-spectrum antimicrobial agent, is commonly used in personal care products, household goods, and industrial items. Its extensive use and subsequent release have led to frequent detections in aquatic ecosystems worldwide, potentially harming ecosystem health. Therefore, an outdoor mesocosm experiment was conducted to assess the effects of triclosan on community structure (microbes, phytoplankton, zooplankton, and macroinvertebrates) and ecosystem functioning in freshwater ecosystems under sub-tropical conditions.

Charting a course for freshwater biomonitoring: The grand challenges identified by the global scientific community.

The past 50 years have seen biomonitoring emerge as an essential means of generating the knowledge needed to inform protection and restoration of freshwater ecosystems. Despite the successes of biomonitoring, most freshwater ecosystems remain unmonitored. Moreover, degradation of freshwaters continues at a rapid rate with new threats and novel stressors emerging that are difficult to assess using existing techniques.

Asymmetric Micro-Evolutionary Responses in a Warming World: Heat-Driven Adaptation Enhances Metal Tolerance in a Planktonic Rotifer, but Not Vice Versa.

The resilience of natural populations in the face of global environmental change is determined by their ability to adapt to multiple, often interacting, stressors. Microevolutionary adaptation to one stressor can either enhance or reduce tolerance to other stressors. In the context of climate change, it is crucial to understand the effect of warming on the tolerance of organisms to additional environmental challenges.

Multiple Stressor Effects of a Neonicotinoid, Heatwaves, and Elevated Temperatures on Aquatic Insect Emergence.

Intensive agricultural practices, including neonicotinoid insecticides, and climate change are two potential drivers of global insect decline, contributing to biodiversity loss. However, ecologically realistic field experiments investigating these multiple stressor effects on emerging aquatic insects are scarce. To empirically test whether exposure to imidacloprid (1, 10 μg/L) and two different climate change scenarios (i) elevated temperatures (+4 °C vs.

Antibiotic-induced multi-trophic effects and their cascades in a sub-tropical freshwater ecosystem.

Antibiotics are commonly detected in aquatic ecosystems worldwide due to their extensive use and excretion by humans and animals, posing potential risks to the health of these ecosystems. This study aimed to assess the ecological effects of the antibiotic ciprofloxacin on both structural (microbes, phytoplankton, zooplankton, and macroinvertebrates) and functional endpoints of a sub-tropical freshwater ecosystem. Ciprofloxacin was applied at concentrations of 0, 0.

Heatwaves, elevated temperature, and insecticide-induced effects at different trophic levels of a freshwater ecosystem.

Heatwaves and increasing average temperatures associated with climate change pose severe stress on nature, including freshwater ecosystems. As these thermal stressors do not act in isolation over temporal or spatial scales, interactions with other stressors, like pesticides, may lead to unpredictable combined effects. Empirical studies investigating multiple stressor effects across different trophic levels are scarce and often lack environmental realism.

Effects of the drug carbamazepine on the structure and functioning of a freshwater aquatic ecosystem.

Carbamazepine, a widely used psychotropic drug, has been frequently detected in surface waters due to its poor removal in conventional wastewater treatment and slow dissipation in aquatic systems. While carbamazepine's ecotoxicological effects have frequently been researched, most research focuses on high concentrations and single species, with only a few studies including more ecological complexity and environmentally relevant concentrations. With a mesocosm experiment, we investigated the long-term ecological effects of environmentally relevant concentrations of carbamazepine (0.

Adapting to an increasingly stressful environment: Experimental evidence for 'micro-evolutionary priming'.

In many natural systems, animal populations are exposed to increasing levels of stress. Stress levels tend to fluctuate, and long-term increases in average stress levels are often accompanied by greater amplitudes of such fluctuations. Micro-evolutionary adaptation may allow populations to cope with gradually increasing stress levels but may not prevent their extirpation during acute stress events unless adaptation to low stress levels also increases their tolerance to acute stress.

From river to groundwater: Antibiotics pollution, resistance prevalence, and source tracking.

The extensive use of antibiotics has led to their frequent detection as residues in the environment. However, monitoring of their levels in groundwater and the associated ecological and health risks remains limited, and the impact of river pollution on groundwater is still unclear. This study focused on the highly urbanized Maozhou River and its groundwater.

Assessing chronic effects of chemical pollution on biodiversity using mean species abundance relationships.

Because chemical pollution poses a persistent threat to freshwater ecosystems and biodiversity, innovative methodologies are required to address the ecological risks associated with such pollutants. This study predicts the long-term impacts of chemicals based on an equation that describes the time dependency of the median lethal and effect concentration (L(E)C50) with the critical body residue concept. This way, the methodology can predict species sensitivity distributions for any given time point.

Effects of environmentally relevant concentrations of citalopram in freshwater mesocosms.

Increased pharmaceutical usage has led to their widespread presence in aquatic environments, resulting in concerns regarding their potential environmental impacts. Antidepressants, particularly selective serotonin reuptake inhibitors (SSRIs) like citalopram, are frequently detected in European surface waters. Acute laboratory studies have demonstrated that citalopram can inhibit algal growth, immobilise Daphnia magna, and may result in foot detachment (i.

Differential effects of pharmaceuticals and insecticides on swimming behaviour and survival in Gammarus pulex.

Many freshwater systems are continuously exposed to waste streams like municipal wastewater and agricultural runoff, leading to exposure to chemicals that can cause mortality and behavioural changes in aquatic organisms. While research has advanced our understanding of pesticide effects on behaviour of aquatic organisms, the impacts of pharmaceuticals are less understood. Psychopharmaceuticals are particularly interesting because they can act on nervous systems, potentially affecting the behaviour of aquatic organisms.

Combined stress of an insecticide and heatwaves or elevated temperature induce community and food web effects in a Mediterranean freshwater ecosystem.

Ongoing global climate change will shift nature towards Anthropocene's unprecedented conditions by increasing average temperatures and the frequency and severity of extreme events, such as heatwaves. While such climatic changes pose an increased threat for freshwater ecosystems, other stressors like pesticides may interact with warming and lead to unpredictable effects. Studies that examine the underpinned mechanisms of multiple stressor effects are scarce and often lack environmental realism.

A dynamic energy budget (DEB) model to assess the sublethal effects of imidacloprid toward Gammarus pulex at different temperatures.

Environmental ambient temperature significantly impacts the metabolic activities of aquatic ectotherm organisms and influences the fate of various chemicals. Although numerous studies have shown that the acute lethal toxicity of most chemicals increases with increasing temperature, the impact of temperature on chronic effects - encompassing both lethal and sublethal endpoints - has received limited attention. Furthermore, the mechanisms linking temperature and toxicity, potentially unveiled by toxicokinetic-toxicodynamic models (TKTD), remains inadequately explored.

Temperature induced changes in species distribution increases sensitivity of aquatic invertebrate communities to chemicals.

In this commentary, I will discuss how climate warming might influence the impacts of chemicals on (aquatic) ecosystems. It provides a commentary on Sinclair et al. (2024).

Assessing ecological responses to exposure to the antibiotic sulfamethoxazole in freshwater mesocosms.

Antibiotics are a contaminant class of worldwide concern as they are frequently detected in aquatic ecosystems. To better understand the impacts of antibiotics on aquatic ecosystems, we conducted an outdoor mesocosm experiment in which aquatic communities were exposed to different concentrations of the antibiotic sulfamethoxazole (0, 0.15, 1.

Integrating climate model projections into environmental risk assessment: A probabilistic modeling approach.

The Society of Environmental Toxicology and Chemistry (SETAC) convened a Pellston workshop in 2022 to examine how information on climate change could be better incorporated into the ecological risk assessment (ERA) process for chemicals as well as other environmental stressors. A major impetus for this workshop is that climate change can affect components of ecological risks in multiple direct and indirect ways, including the use patterns and environmental exposure pathways of chemical stressors such as pesticides, the toxicity of chemicals in receiving environments, and the vulnerability of species of concern related to habitat quality and use. This article explores a modeling approach for integrating climate model projections into the assessment of near- and long-term ecological risks, developed in collaboration with climate scientists.

Toxicokinetic-Toxicodynamic Model to Assess Thermal Stress.

Temperature is a crucial environmental factor affecting the distribution and performance of ectothermic organisms. This study introduces a new temperature damage model to interpret their thermal stress. Inspired by the ecotoxicological damage model in the General Unified Threshold model for Survival (GUTS) framework, the temperature damage model assumes that damage depends on the balance between temperature-dependent accumulation and constant repair.

Evaluating the effects of climate change and chemical, physical, and biological stressors on nearshore coral reefs: A case study in the Great Barrier Reef, Australia.

An understanding of the combined effects of climate change (CC) and other anthropogenic stressors, such as chemical exposures, is essential for improving ecological risk assessments of vulnerable ecosystems. In the Great Barrier Reef, coral reefs are under increasingly severe duress from increasing ocean temperatures, acidification, and cyclone intensities associated with CC. In addition to these stressors, inshore reef systems, such as the Mackay-Whitsunday coastal zone, are being impacted by other anthropogenic stressors, including chemical, nutrient, and sediment exposures related to more intense rainfall events that increase the catchment runoff of contaminated waters.

Effects of antidepressant exposure on aquatic communities assessed by a combination of morphological identification, functional measurements, environmental DNA metabarcoding and bioassays.

The antidepressant fluoxetine is frequently detected in aquatic ecosystems, yet the effects on aquatic communities and ecosystems are still largely unknown. Therefore the aim of this study is to assess the effects of the long-term application of fluoxetine on key components of aquatic ecosystems including macroinvertebrate-, zooplankton-, phytoplankton- and microbial communities and organic matter decomposition by using traditional and non-traditional assessment methods. For this, we exposed 18 outdoor mesocosms (water volume of 1530 L and 10 cm of sediment) to five different concentrations of fluoxetine (0.

Using a Bayesian Network Model to Predict Risk of Pesticides on Aquatic Community Endpoints in a Rice Field-A Southern European Case Study.

Bayesian network (BN) models are increasingly used as tools to support probabilistic environmental risk assessments (ERAs), because they can better account for uncertainty compared with the simpler approaches commonly used in traditional ERA. We used BNs as metamodels to link various sources of information in a probabilistic framework, to predict the risk of pesticides to aquatic communities under given scenarios. The research focused on rice fields surrounding the Albufera Natural Park (Valencia, Spain), and considered three selected pesticides: acetamiprid (an insecticide), 2-methyl-4-chlorophenoxyacetic acid (MCPA; a herbicide), and azoxystrobin (a fungicide).

Heatwaves, elevated temperatures, and a pesticide cause interactive effects on multi-trophic levels of a freshwater ecosystem.

Climate impacts of elevated temperatures and more severe and frequent weather extremes like heatwaves are globally becoming discernible on nature. While a mechanistic understanding is pivotal for ecosystem management, stressors like pesticides may interact with warming, leading to unpredictable effects on freshwater ecosystems. These multiple stressor studies are scarce and experimental designs often lack environmental realism.