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Aquatic Toxicology

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https://www.readbyqxmd.com/read/29334673/copper-bioaccumulation-and-biokinetic-modeling-in-marine-herbivorous-fish-siganus-oramin
#1
Yanyan Zhou, Fangsan Wei, Wei Zhang, Zhiqiang Guo, Li Zhang
Marine herbivorous fish directly consume macroalgae, which commonly accumulate high levels of trace metals in polluted areas. We proposed that herbivorous fish could be better candidates for biomonitoring marine metal pollution than carnivorous fish. To date, the trophic transfer of Cu from macroalgae to marine herbivorous fish is unclear. In this study, the kinetics of Cu bioaccumulation in a widespread marine herbivorous fish, Siganus oramin, were investigated, and biokinetic modeling was applied to estimate the Cu levels in the fish sampled from different sites and seasons...
January 10, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29334672/oxidative-and-interactive-challenge-of-cadmium-and-ocean-acidification-on-the-smooth-scallop-flexopecten-glaber
#2
Alessandro Nardi, Maura Benedetti, Daniele Fattorini, Francesco Regoli
Ocean acidification (OA) may affect sensitivity of marine organisms to metal pollution modulating chemical bioavailability, bioaccumulation and biological responsiveness of several cellular pathways. In this study, the smooth scallop Flexopecten glaber was exposed to various combinations of reduced pH (pH/pCO2 7.4/∼3000 μatm) and Cd (20 μg/L). The analyses on cadmium uptake were integrated with those of a wide battery of biomarkers including metallothioneins, single antioxidant defenses and total oxyradical scavenging capacity in digestive gland and gills, lysosomal membrane stability and onset of genotoxic damage in haemocytes...
January 8, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29324395/effects-of-lanthanum-on-microcystis-aeruginosa-attention-to-the-changes-in-composition-and-content-of-cellular-microcystins
#3
Fei Shen, Lihong Wang, Qing Zhou, Xiaohua Huang
Algal blooms threaten human health and aquatic ecosystem through the production of microcystins (MCs) by toxic strains. The accumulation of rare earth elements (REEs) in water affects the growth and physiological activities of algae. However, whether or how REEs affect cellular microcystins (MCs) is largely unknown. In this study, the effects of lanthanum ion [La(III)], a type of REE, on the MCs in Microcystis aeruginosa were investigated, and the mechanism of the effect was analyzed using ecological stoichiometry...
January 6, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29331520/vitamin-c-attenuates-biochemical-and-genotoxic-damage-in-common-carp-cyprinus-carpio-upon-joint-exposure-to-combined-toxic-doses-of-fipronil-and-buprofezin-insecticides
#4
Madiha Ghazanfar, Sana Shahid, Irfan Zia Qureshi
In the present study, potential protective role of Vitamin C (l-ascorbic acid) was investigated in aquaria acclimated common carp (Cyprinus carpio) following exposure for 96 h to combined toxic doses of fipronil (FP) and buprofezin (BPFN) insecticides in combination (FP: 200 μg/L; 4.57 × 10-7 mol/L and BPFN: 50 mg/L; 1.64 × 10-4 mol/L). At end of 96 h exposure, fish were supplemented with low (25 mg/L) and high (50 mg/L) doses of Vitamin C, added once daily to aquaria water for continuous three weeks...
January 5, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29324394/effects-of-ocean-acidification-on-copepods
#5
REVIEW
Minghua Wang, Chang-Bum Jeong, Young Hwan Lee, Jae-Seong Lee
Ocean acidification (OA) leads to significant changes in seawater carbon chemistry, broadly affects marine organisms, and considered as a global threat to the fitness of marine ecosystems. Due to the crucial role of copepods in marine food webs of transferring energy from primary producers to higher trophic levels, numerous studies have been conducted to examine the impacts of OA on biological traits of copepods such as growth and reproduction. Under OA stress, the copepods demonstrated species-specific and stage-dependent responses...
January 5, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29328973/feeding-inhibition-in-corbicula-fluminea-o-f-muller-1774-as-an-effect-criterion-to-pollutant-exposure-perspectives-for-ecotoxicity-screening-and-refinement-of-chemical-control
#6
Bruno Branco Castro, Carlos Silva, Inês Patrunilho Efe Macário, Bruno Oliveira, Fernando Gonçalves, Joana Luísa Pereira
Bivalves are commonly used in biomonitoring programs to track pollutants. Several features, including its filter-feeding abilities, cumulatively argue in favour of the use of the Asian clam (Corbicula fluminea) as a biosentinel and an ecotoxicological model. Filtration in bivalves is very sensitive to external stimuli and its control is dictated by regulation of the opening/closure of the valves, which may be used as an avoidance defence against contaminants. Here, we investigate the filter-feeding behaviour of the Asian clam as an endpoint for assessing exposure to pollutants, driven by two complementary goals: (i) to generate relevant and sensitive toxicological information based on the ability of C...
January 4, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29328974/novel-approach-for-evaluating-pharmaceuticals-toxicity-using-daphnia-model-analysis-of-the-mode-of-cytochrome-p450-generated-metabolite-action-after-acetaminophen-exposure
#7
Ryeo-Ok Kim, Min-A Jo, Jinhaeng Song, Il-Chan Kim, Seokjoo Yoon, Woo-Keun Kim
Because of its widespread use, the pharmaceutical acetaminophen (APAP) is frequently detected in aquatic environments. APAP can have serious physiological effects, such as reduced reproduction, low growth rates, and abnormal behavior, in aquatic organisms. However, the methods available for evaluation of the aquatic toxicity of APAP are of limited usefulness. The present study aimed to develop reliable and sensitive markers for evaluation of APAP toxicity using Daphnia as a model organism. We focused on N-acetyl-p-benzoquinoneimine (NAPQI) production from APAP via cytochrome P450 metabolism because NAPQI causes APAP toxicity...
December 30, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29306793/the-protective-role-of-multixenobiotic-resistance-mxr-mediated-atp-binding-cassette-abc-transporters-in-biocides-exposed-rotifer-brachionus-koreanus
#8
Young Hwan Lee, Hye-Min Kang, Min-Sub Kim, Jin-Sol Lee, Chang-Bum Jeong, Jae-Seong Lee
P-glycoprotein (P-gp) and multidrug resistance-associated protein (MRP) are ATP-binding cassette (ABC) transporters that confer multixenobiotic resistance (MXR) via their efflux activity, which enables a variety of xenobiotics to be expelled from cells. MXR has been proposed as the first line of defense against xenobiotics. In this study, the protective roles of P-gp and MRP in the rotifer Brachionus koreanus were examined in response to four biocides (alachlor, chlorpyrifos, endosulfan, and molinate) using fluorescent substrates and inhibitors specific to P-gp and MRP...
December 30, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29306034/role-of-mtor-in-autophagic-and-lysosomal-reactions-to-environmental-stressors-in-molluscs
#9
Susanna Sforzini, Michael N Moore, Caterina Oliveri, Anna Volta, Awadhesh Jha, Mohamed Banni, Aldo Viarengo
Lysosomal membrane stability (LMS) has been used in various organisms as a very sensitive biomarker of stress. However, despite the abundance of data about regulation of the autophagic process in mammals, in the invertebrates there is only limited mechanistic understanding. Marine mussels (Mytilus galloprovincialis Lam.) are bivalve molluscs, widely used as models in ecotoxicology and as environmental bioindicators of sea water quality. In order to elucidate this fundamental process, in the present study, mussels were exposed for 3 days to a "priority", ubiquitous environmental contaminant, benzo[a]pyrene (B[a]P) at different concentrations (i...
December 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29304407/the-effect-of-chlorpyrifos-on-salinity-acclimation-of-juvenile-rainbow-trout-oncorhynchus-mykiss
#10
Bagher Mojazi Amiri, Elvis Genbo Xu, Allison Kupsco, Marissa Giroux, Mahbubeh Hoseinzadeh, Daniel Schlenk
As a part of their unique life cycle, most salmonids undergo a transition from fresh water to salt water requiring various adjustments in metabolism, osmoregulation and ion regulation. Exposure to pesticides may affect the acclimation of juvenile salmonids to salt water during downstream migration to estuaries. Using the Caspian Sea as a model waterbody, the present study aimed to determine how the toxicity of the organophosphate pesticide chlorpyrifos (CPF) impacts saline acclimation of rainbow trout (Oncorhynchus mykiss)...
December 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29304406/multixenobiotic-resistance-in-mytilus-edulis-molecular-and-functional-characterization-of-an-abcg2-type-transporter-in-hemocytes-and-gills
#11
Yosra Ben Cheikh, Benoit Xuereb, Céline Boulangé-Lecomte, Frank Le Foll
Among the cellular protection arsenal, ABC transporters play an important role in xenobiotic efflux in marine organisms. Two pumps belonging to B and C subfamily has been identified in Mytilus edulis. In this study, we investigated the presence of the third major subtype ABCG2/BCRP protein in mussel tissues. Transcript was expressed in hemocytes and with higher level in gills. Molecular characterization revealed that mussel ABCG2 transporter shares the sequence and organizational structure with mammalian and molluscan orthologs...
December 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29288934/microplastics-have-a-more-profound-impact-than-elevated-temperatures-on-the-predatory-performance-digestion-and-energy-metabolism-of-an-amazonian-cichlid
#12
Bin Wen, Nan Zhang, Shi-Rong Jin, Zai-Zhong Chen, Jian-Zhong Gao, Ying Liu, Han-Peng Liu, Zhe Xu
Knowledge on the impacts of microplastics (MPs) pollution on freshwater environments and biota remains limited. Meanwhile, freshwater ecosystems have been threatened by elevated temperatures caused by climate change. To date, no information exists on how MPs-especially under elevated temperature conditions-affect predatory performance, digestive processes and metabolic pathways in freshwater organisms. Here, we examined MPs, elevated temperature and their combined effects on juveniles (0+ group) of an Amazonian cichlid, the discus fish (Symphysodon aequifasciatus)...
December 26, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29306033/a-glyphosate-micro-emulsion-formulation-displays-teratogenicity-in-xenopus-laevis
#13
Patrizia Bonfanti, M Saibene, R Bacchetta, P Mantecca, A Colombo
Glyphosate is the active ingredient in broad-spectrum herbicide formulations used in agriculture, domestic area and aquatic weed control worldwide. Its market is growing steadily concurrently with the cultivation of glyphosate-tolerant transgenic crops and emergence of weeds less sensitive to glyphosate. Ephemeral and lentic waters near to agricultural lands, representing favorite habitats for amphibian reproduction and early life-stage development, may thus be contaminated by glyphosate based herbicides (GBHs) residues...
December 24, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29287174/effects-of-triphenyl-phosphate-on-growth-reproduction-and-transcription-of-genes-of-daphnia-magna
#14
Siliang Yuan, Han Li, Yao Dang, Chunsheng Liu
The additive flame retardant triphenyl phosphate (TPHP) has been frequently detected in environments and biota. Evidences indicate that TPHP has potential risks to aquatic organisms. Seldom has been reported about its chronic effects to aquatic organism at low trophic levels, such as Cladocera. In the present study, <12 h old Daphnia magna (D. magna) were exposed to 0, 5, 50 or 500 μg/L TPHP for 21 days to investigate the chronic effects of TPHP on body length, fecundity and survival. Meanwhile, D...
December 23, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29287173/microplastics-cause-neurotoxicity-oxidative-damage-and-energy-related-changes-and-interact-with-the-bioaccumulation-of-mercury-in-the-european-seabass-dicentrarchus-labrax-linnaeus-1758
#15
Luís Gabriel Antão Barboza, Luís Russo Vieira, Vasco Branco, Neusa Figueiredo, Felix Carvalho, Cristina Carvalho, Lúcia Guilhermino
Microplastics pollution is a global paradigm that raises concern in relation to environmental and human health. This study investigated toxic effects of microplastics and mercury in the European seabass (Dicentrarchus labrax), a marine fish widely used as food for humans. A short-term (96 h) laboratory bioassay was done by exposing juvenile fish to microplastics (0.26 and 0.69 mg/L), mercury (0.010 and 0.016 mg/L) and binary mixtures of the two substances using the same concentrations, through test media...
December 20, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29289872/the-effects-of-high-environmental-ammonia-on-the-structure-of-rainbow-trout-hierarchies-and-the-physiology-of-the-individuals-therein
#16
Josias M B Grobler, Chris M Wood
Our goals were: (i) to determine whether sublethal concentrations of water-borne ammonia would prevent the formation of a dominance hierarchy, or alter its structure, in groups of 4 juvenile trout; (ii) to investigate the behavioral and physiological responses of individuals of different social rank exposed to a concentration of ammonia that still allowed hierarchy formation. Social hierarchies were created by using a technique in which a food delivery system that created competition also served to isolate individual fish for respirometry...
December 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29276994/transcriptomic-analysis-reveals-transgenerational-effect-of-hypoxia-on-the-neural-control-of-testicular-functions
#17
Keng Po Lai, Jing Woei Li, Simon Yuan Wang, Miles Teng Wan, Ting Fung Chan, Wing Yee Lui, Doris Wai-Ting Au, Rudolf Shiu-Sun Wu, Richard Yuen-Chong Kong
There are over 400 hypoxic zones in the ocean worldwide. Both laboratory and field studies have shown that hypoxia causes endocrine disruption and reproductive impairments in vertebrates. More importantly, our recent study discovered that parental (F0) hypoxia exposure resulted in the transgenerational impairment of sperm quality in the F2 generation through the epigenetic regulation of germ cells. In the present study, we aim to test the hypothesis that the brain, as the major regulator of the brain-pituitary-gonad (BPG) axis, is also involved in the observed transgenerational effect...
December 16, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29310040/induction-of-oxidative-stress-by-chlorothalonil-in-the-estuarine-polychaete-laeonereis-acuta
#18
Juliano da Silva Barreto, Fabio de Melo Tarouco, Filipe Guilherme Andrade de Godoi, Márcio Alberto Geihs, Fiamma Eugenia Lemos Abreu, Gilberto Fillmann, Juliana Zomer Sandrini, Carlos Eduardo da Rosa
Chlorothalonil is an active biocide applied in antifouling paints, and also used as fungicide in agricultural activities with the purpose to protect plants from foliar and seed diseases. Thus, the aim of this study was to evaluate the effects of chlorothalonil exposure on biochemical biomarkers of oxidative metabolism as well as on cholinesterases in the estuarine polychaete Laeonereis acuta. Animals were exposed for 24 and 96 h to the following nominal concentrations of chlorothalonil: 0.1, 10.0 and 100...
December 15, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29248761/low-dose-metformin-exposure-causes-changes-in-expression-of-endocrine-disruption-associated-genes
#19
Nicholas J Niemuth, Rebecca D Klaper
The presence of intersex fish in watersheds around the world is a warning of the presence of anthropogenic endocrine-disrupting compounds (EDCs) being deposited into the aquatic environment. The anti-diabetic drug metformin is among the most prevalent and ubiquitous of the myriad pharmaceuticals found in wastewater effluent and watersheds worldwide. In addition to its prescription for type-2 diabetes, metformin is indicated as a treatment in cancers and the endocrine disorder polycystic ovarian syndrome (PCOS)...
December 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29247975/6-2-fluorotelomer-sulfonamide-alkylbetaine-6-2-ftab-a-novel-perfluorooctane-sulfonate-alternative-induced-developmental-toxicity-in-zebrafish-embryos
#20
Guohui Shi, Yu Xie, Yong Guo, Jiayin Dai
6:2 fluorotelomer sulfonamide alkylbetaine (6:2 FTAB) is a major component of Forafac®1157, a novel perfluorooctane sulfonate (PFOS) alternative used globally in aqueous film forming foams (AFFFs). Although 6:2 FTAB has been recently detected in the aquatic environment, its toxic effects on aquatic organisms remain unclear. Here, zebrafish embryos were exposed to various concentrations of 6:2 FTAB (0, 5, 10, 20, 40, 60, 80, and 100 mg/L) from 6 to 120 h post-fertilization (hpf) to investigate its developmental toxicity and possible mechanism of action...
December 7, 2017: Aquatic Toxicology
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