Chang J.,Nanjing Agricultural University |
Liu S.,Zhejiang University |
Zhou S.,Zhejiang Environmental Monitoring Center |
Wang M.,Nanjing Agricultural University |
Zhu G.,Zhejiang University
Experimental and Toxicologic Pathology | Year: 2013
Butachlor, a chloracetamide herbicide, is widely used in China. In the present study, paired adult male and female zebrafish (Danio rerio) were exposed to various concentrations of butachlor (0, 25, 50 and 100 μg/L) for 30 days, and the effects on reproduction and endocrine disruption were evaluated using fecundity, condition factor (CF), gonadosomatic index (GSI), liver somatic index (LSI), plasma vitellogenin (VTG), sex steroids and thyroid hormone levels as endpoints. Our results showed that the mean fecundity rates were significantly decreased at 50 and 100 μg/L butachlor during the 30-day exposure period. At the end of the exposure period, no significant changes were observed in CF and LSI in both females and males, while GSI was significantly reduced in males at 50 and 100 μg/L butachlor. At 100 μg/L butachlor, plasma testosterone (T) and 17β-estradiol (E2) levels were significantly decreased in females, while plasma VTG level was significantly increased in males. Plasma thyroxine (T4) and triiodothyronine (T3) levels were significantly increased at 50 and 100 μg/L butachlor in males, and at 100 μg/L in females. This work demonstrated that butachlor adversely affected the normal reproductive success of zebrafish, and disrupted the thyroid and sex steroid endocrine systems, which provides the basis for the estimated ecological risk during butachlor exposure. © 2011 Elsevier GmbH.
Lu L.,Zhejiang University |
Zhan Y.,Zhejiang University |
Zhan Y.,State Oceanic Administration |
Chen J.,State Oceanic Administration |
Mou Y.,Zhejiang Environmental Monitoring Center
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2010
Land use pattern is one of the important factors influencing regional ecosystem health. An assessment index system of "vigor-organization- resilience-service" was built to diagnose the regional ecosystem health of Zhoushan Island. Of which, the vigor index was represented by relative density of vegetation, and organization index was indicated by four indices of landscape pattern, including contagion, Shannon' s diversity, Shannon' s evennesss, and ineterfusion & juxtaposition. The administrative units of town, township or subdistrict were taken for evaluation. Based on remote sensing images and land-use-survey data, using GIS and RS techonologies, the spatial and temporal dynamics of ecosystem health of Zhoushan in 5 successive periods during 1970 - 2005 were assessed in terms of the comprehensive parameters evaluation modle. The results showed that the ecosystem health of Zhoushan Island declined in the past 35 years in general. It dropped by 18% and 8% in good and ordinary areas respectively, while increased by 26% in worse area. The main reasons causing the decrease of the ecosystem health of Zhoushan Island were urbanization, beach land reclamation and industrial development.
Mou Y.,Zhejiang Environmental Monitoring Center
2012 1st International Conference on Agro-Geoinformatics, Agro-Geoinformatics 2012 | Year: 2012
Noise impacts evaluation of island wind plant is significant for protecting the living environment of island residents and wildlife habitats. To analyze principle noise factor and its impacts on Zhejiang coastal area, both the distance attenuation theory and GIS spatial analysis tools were introduced in this research. Specifically, the noise distributions of different air blowers were analyzed. Different factors affecting the noise distribution were taken into account, which include distance, attenuation coefficient, topography and wind velocity. The analysis is based on 1:500 topographic map, which was further segmented into 1010 meter grids. According to the analysis, the error between research result and the on-the-spot datum of sensitive spots is 03dB (A), which proves that the method in this research is effective. © 2012 IEEE.
Wang K.,Zhejiang University |
Dai X.,Zhejiang University |
Li Z.,Zhejiang Environmental Monitoring Center |
Wei B.,Zhejiang University
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2010
Ammonia (NH3) and other air pollution emissions from concentrated animal feeding operations (CAFOs) are becoming more and more serious with the rapid development of livestock and poultry production in recent years. The ammonia emission factor is one of the effective methods for estimating ammonia emissions from CAFOs and evaluating of emission reduction technologies. A continual monitoring system of the NH3 concentration and environmental parameters is used in this research, and the ammonia emission factors and impact factors of the three types of floor systems in the pig buildings are studied. Mean daily emissions per pig fattened on the semi-slatted floor system, concrete floor system, and deep-litter system are (9.47±7.09), (11.23±4.23), (4.27±2.09)g/(d · pig), respectively.
Sun L.,Zhejiang University of Technology |
Shao X.,Zhejiang University of Technology |
Hu X.,Zhejiang University of Technology |
Chi J.,Zhejiang University of Technology |
And 3 more authors.
Aquatic Toxicology | Year: 2011
Determining ecotoxicological risks of exposure to mixtures of endocrine disrupting chemicals (EDCs) remains a daunting challenge in environmental toxicology. Recently, some studies have illustrated that transcriptional profiling of genes offers the potential to identify the chemical causation of effects that are induced by exposure to complex mixtures. In the present study, the transcriptional responses of a set of genes involved in the hypothalamic-pituitary-gonadal (HPG, or HPG[L]-liver) axis of Japanese medaka (Oryzias latipes) were systematically examined after treatment with a combination of an estrogen (17α-ethinylestradiol [EE2], 20 ng/L) and two model anti-estrogens, the aromatase inhibitor (AI) letrozole (LET) and the selective estrogen-receptor modulator (SERM) tamoxifen (TAM), at three concentrations (30, 100 and 300. μg/L) for 72 h. The data presented demonstrate that although gene transcription analyses increase our mechanistic understanding of the modes of action (MOAs) of EDCs, the characteristic of most genes altered by a certain single chemical exposure may not be useful for diagnostic chemical causation in a mixture exposure situation. For example, the induction of one vitellogenin gene (VTG1) transcription caused by EE2 in male fish was effectively blocked after exposure to a combination of EE2 and LET but not EE2 and TAM. Moreover, the responses in gene transcription to coexposure were elicited partially in a nonmonotonic concentration-dependent manner. Therefore, the application of transcriptional profiling of genes for screening complex environmental samples should be further evaluated until biomarker gene responses are robust and sensitive enough to properly assess the complex interactions. © 2011 Elsevier B.V.