Abstract：
:Extracellular DNA (exDNA) pool in aquatic environments is a valuable source for biomonitoring and bioassessment. However, degradation under particular environmental conditions can hamper exDNA detectability over time. In this study, we analyzed how different biotic and abiotic factors affect the degradation rate of extracellular environmental DNA using 16S rDNA sequences extracted from the sediment of a eutrophic lake and Anabaena variabilis cultured in the laboratory. We exposed the extracted exDNA to different levels of temperature, light, pH, and bacterial activity, and quantitatively analyzed the concentration of exDNA during 4 days. The solution containing bacteria for microbial activity treatment was obtained from the lake sediment using four consecutive steps of filtration; two mesh filters (100 μm and 60 μm mesh) and two glass fiber filters (2.7 μm and 1.2 μm pore-sized). We found that temperature individually and in combination with bacterial abundance had significant positive effects on the degradation of exDNA. The highest degradation rate was observed in samples exposed to high microbial activity, where exDNA was completely degraded within 1 day at a rate of 3.27 day-1. Light intensity and pH had no significant effects on degradation rate of exDNA. Our results indicate that degradation of exDNA in freshwater ecosystems is driven by the combination of both biotic and abiotic factors and it may occur very fast under particular conditions.
journal_name
Int J Environ Res Public Healthauthors
Zulkefli NS,Kim KH,Hwang SJdoi
10.3390/ijerph16183339subject
Has Abstractpub_date
2019-09-10 00:00:00issue
18eissn
1661-7827issn
1660-4601pii
ijerph16183339journal_volume
16pub_type
杂志文章abstract：:This study aimed to investigate the effects of temperature on the quality of vermicompost and microbial profiles of dewatered sludge during vermicomposting. To do this, fresh sludge was separately vermicomposted with the earthworm Eisenia fetida under different temperature regimes, specifically, 15 °C, 20 °C, and 25 °...
journal_title：International journal of environmental research and public health
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abstract：BACKGROUND:Despite a long average lifespan, increased life expectancy does not guarantee higher quality of life. METHODS:To contribute in understanding some determinants of healthy life expectancies in older Japanese individuals in a snowy winter region, we investigated the indicators of health. Local residents (n = 1...
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journal_title：International journal of environmental research and public health
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更新日期：2019-02-17 00:00:00
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更新日期：2020-11-18 00:00:00
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更新日期：2019-09-12 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2020-09-30 00:00:00
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更新日期：2019-11-18 00:00:00
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journal_title：International journal of environmental research and public health
pub_type： 杂志文章
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更新日期：2019-01-31 00:00:00
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更新日期：2020-06-12 00:00:00
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更新日期：2020-07-15 00:00:00
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