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排序方式: 共有196条查询结果,搜索用时 46 毫秒
121.
Julie Lucas Prescilla Perrichon Marine Nouhaud Alexandre Audras Isabelle Leguen Christel Lefrancois 《Environmental science and pollution research international》2014,21(24):13888-13897
The increase of anthropogenic activities on coastal areas induces discharges of polycyclic aromatic hydrocarbons (PAHs) in aquatic ecosystem. PAH effects depend not only on their concentration and the way of contamination but also on the different developmental stages of the organism. Zebrafish were exposed to relevant concentration of pyrolytic PAHs from the first meal (i.e., 5-day post fertilization, dpf) to mature adults. Parental effect of this type of exposure was evaluated through the assessment of aerobic metabolic scope, cardiac frequency, and cardiac mRNA expression on larval and/or embryo progeny of contaminated fish. Our results suggest that cardiac frequency increased in larval descendants of fish exposed to the environmental concentration of pyrolytic PAHs (i.e., 5 ng.g?1 of food), while a lack of effect on aerobic metabolism in 5 dpf larvae was highlighted. A surexpression of mRNA related to the cardiac calcium transporting ATPase atp2a2a, a protein essential for contraction, is in accordance with this increasing cardiac frequency. Even if cardiac development genes cmlc1 and tnnt2a were not affected at early life stages tested, complementary work on cardiac structure could be interesting to better understand PAHs action. 相似文献
122.
Poulain AJ Orihel DM Amyot M Paterson MJ Hintelmann H Southworth GR 《Chemosphere》2006,65(11):2199-2207
The purpose of our study was to test the hypothesis that dissolved gaseous mercury (DGM) production and evasion is directly proportional to the loading rate of inorganic mercury [Hg(II)] to aquatic ecosystems. We simulated different rates of atmospheric mercury deposition in 10-m diameter mesocosms in a boreal lake by adding multiple additions of Hg(II) enriched with a stable mercury isotope (202Hg). We measured DGM concentrations in surface waters and estimated evasion rates using the thin-film gas exchange model and mass transfer coefficients derived from sulfur hexafluoride (SF6) additions. The additions of Hg(II) stimulated DGM production, indicating that newly added Hg(II) was highly reactive. Concentrations of DGM derived from the experimental Hg(II) additions (“spike DGM”) were directly proportional to the rate of Hg(II) loading to the mesocosms. Spike DGM concentrations averaged 0.15, 0.48 and 0.94 ng l−1 in mesocosms loaded at 7.1, 14.2, and 35.5 μg Hg m−2 yr−1, respectively. The evasion rates of spike DGM from these mesocosms averaged 4.2, 17.2, and 22.3 ng m−2 h−1, respectively. The percentage of Hg(II) added to the mesocosms that was lost to the atmosphere was substantial (33–59% over 8 weeks) and was unrelated to the rate of Hg(II) loading. We conclude that changes in atmospheric mercury deposition to aquatic ecosystems will not change the relative proportion of mercury recycled to the atmosphere. 相似文献
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Fagundes Soares Garcia AC Marcon AE Ferreira Dde M Barbosa dos Santos EA do Amaral VS de Medeiros SR 《Journal of environmental monitoring : JEM》2011,13(12):3329-3335
The present study evaluated the mutagenic potential of surface water from the Lucrecia dam. The Tradescantia-micronucleus (Trad-MCN) test and CBMN assay in human peripheral blood lymphocytes were applied, corresponding to an in vivo and in vitro system, respectively. Heavy metals and some physicochemical properties were also measured. Water samples were collected in November 2009 (dry season) and May 2010 (rainy season) at three different points. Results of both assays for raw water showed positive responses for the points analyzed when compared to the negative control. The CBMN assay showed that diluted water was still able to induce a significant increase in micronucleus frequency. For both assays, the highest mean MN was observed in the dry season. Chemical analyses detected an increase in heavy metal levels at the sampling points and in the different seasons. These findings indicate the presence of genotoxins, such as heavy metals, in the water, which may be affecting the entire ecosystem, as well as human health. More prolonged monitoring is recommended in order to better characterize this public water supply. 相似文献
125.
Pisa Lennard Goulson Dave Yang En-Cheng Gibbons David Sánchez-Bayo Francisco Mitchell Edward Aebi Alexandre van der Sluijs Jeroen MacQuarrie Chris J. K. Giorio Chiara Long Elizabeth Yim McField Melanie Bijleveld van Lexmond Maarten Bonmatin Jean-Marc 《Environmental science and pollution research international》2021,28(10):11749-11797
Environmental Science and Pollution Research - New information on the lethal and sublethal effects of neonicotinoids and fipronil on organisms is presented in this review, complementing the... 相似文献
126.
Zerrifi Soukaina El Amrani Redouane El Mahdi Mugani Richard Ribeiro Inês de Fátima Carvalho Maria Campos Alexandre Barakate Mustapha Vasconcelos Vitor Oudra Brahim El Khalloufi Fatima 《Environmental science and pollution research international》2021,28(1):235-245
Environmental Science and Pollution Research - In recent decades, harmful cyanobacterial blooms (HCBs) have become a severe hazard for human health mainly in drinking water resources and are... 相似文献
127.
Melanin is the most common pigment in animal integuments and is responsible for some of the most striking ornaments. A central tenet of sexual selection theory states that melanin-based traits can signal absolute individual quality in any environment only if their expression is condition-dependent. Significant costs imposed by an ornament would ensure that only the highest quality individuals display the most exaggerated forms of the signal. Firm evidence that melanin-based traits can be condition-dependent is still rare in birds. In an experimental test of this central assumption, we report condition-dependent expression of a melanin-based trait in the Eurasian kestrel (Falco tinnunculus). We manipulated nestling body condition by reducing or increasing the number of nestlings soon after hatching. A few days before fledging, we measured the width of sub-terminal black bands on the tail feathers. Compared to nestlings from enlarged broods, individuals raised in reduced broods were in better condition and thereby developed larger sub-terminal bands. Furthermore, in 2?years, first-born nestlings also developed larger sub-terminal bands than their younger siblings that are in poorer condition. This demonstrates that expression of melanin-based traits can be condition-dependent. 相似文献
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129.
Vulnerability of Soil and Its Associated Organic Matter to Degradation in a Subtropical Region: A Study From São Paulo State,Brazil
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