Search results for "ekotoksikologia"
showing 6 items of 26 documents
Alterations in Daphnia magna exposed to enniatin B and beauvericin provide additional value as environmental indicators
2022
Mycotoxins beauvericin (BEA) and enniatin B (ENN B) affect negatively several systems and demand more studies as the mechanisms are still unclear. The simultaneous presence of contaminants in the environment manifests consequences of exposure for both animals and flora. Daphnia magna is considered an ideal invertebrate to detect effects of toxic compounds and environmental alterations. In this study, the potential toxicity and the basic mechanism of BEA and ENN B individually and combined were studied in D. magna. Acute and delayed toxicity were evaluated, and transcript levels of genes involved in xenobiotic metabolism (mox, gst, abcb1, and abcc5), reproduction, and oxidative stress (vtg-S…
Does Arsenic Contamination Affect DNA Methylation Patterns in a Wild Bird Population? : An Experimental Approach
2021
Pollutants, such as toxic metals, negatively influence organismal health and performance, even leading to population collapses. Studies in model organisms have shown that epigenetic marks, such as DNA methylation, can be modulated by various environmental factors, including pollutants, influencing gene expression, and various organismal traits. Yet experimental data on the effects of pollution on DNA methylation from wild animal populations are largely lacking. We here experimentally investigated for the first time the effects of early-life exposure to environmentally relevant levels of a key pollutant, arsenic (As), on genome-wide DNA methylation in a wild bird population. We experimentall…
SETAC GLB and SETAC Europe SAC: a liaison promoting the next generation of ecotoxicologists and environmental chemists
2018
Environmental sciences Europe 30(1), 41s12302-018-0171-z (2018). doi:10.1186/s12302-018-0171-z
Nikkelin kertyminen täplärapuun (Pacifastacus leniusculus) kahdessa eri lämpötilassa
2017
Kaivostoiminnan aiheuttamat metallipäästöt ovat maailmanlaajuinen ympäristöongelma. Kaivospäästöjen takia metalleja pääsee luontoon ja eliöstöön biosaatavassa vesiliukoisessa muodossa kuten sulfaatteina tai klorideina. Nikkeli on bioakkumuloituva eliöille haitallinen metalli, jota käytetään teollisuuden raaka-aineena ympäri maailmaa. Tässä tutkielmassa tarkasteltiin nikkelin kertymistä täplärapuun (Pacifastacus leniusculus) laboratorio-olosuhteissa kahdella 14 vrk:n altistuskokeella eri nikkelialtistuspitoisuuksilla kahdessa eri lämpötilassa (7 ja 17 °C). Eri testilämpötiloilla pyrittiin selvittämään, onko nikkelin kertyminen riippuvaista vaihtolämpöisen täpläravun aineenvaihduntatasosta. K…
Toxicity of silver nanoparticles to Lumbriculus variegatus is a function of dissolved silver and promoted by low sediment pH
2018
Toxicity of silver nanoparticles (AgNPs) to benthic organisms is a major concern. The use of AgNPs in industry and consumer products leads to increasing release of AgNPs into the aquatic environment—sediments being the major sink. Effects of sediment pH on the toxicity of AgNPs to benthic oligochaeta Lumbriculus variegatus were studied in a 23‐d toxicity test. Artificially prepared sediments (pH 5 and 7) were spiked with varying concentrations of uncoated AgNP, polyvinylpyrrolidone (PVP)‐coated AgNP, and silver nitrate (AgNO3) as dissolved Ag reference. Number of individuals and biomass change were used as endpoints for the toxicity. The toxic effects were related to the bioaccessible conce…
Effects of organic material on the bioavailability, toxicokinetics and toxicity of xenobiotics in freshwater organisms
2001
Pohjoisille ekosysteemeille tyypillinen runsas orgaanisen aineksen määrä joko liuenneena vedessä tai järvien pohjamudassa voi sitoa useita kemiallisia saasteita ja siten vähentää eliöiden altistumista niille sekä siitä syntyviä myös koko ekosysteemille haitallisia vaikutuksia. Anna Nikkilän tutkimuksessa havaittiin, että orgaaninen aines voi vähentää merkittävästi harvasukamadon sekä vesikirpun altistumista tietyille rasvaliukoisille ympäristömyrkyille aromaattisten monirenkaisten hiilivetyjen (pyreeni, reteeni) sekä kloorifenolien (2,4,5-trikloorifenoli, pentakloorifenoli) ryhmistä. Osa tutkituista yhdisteistä sitoutui orgaaniseen ainekseen eikä näin ollut eliöille altistavassa muodossa. V…