排序方式： 共有58条查询结果，搜索用时 15 毫秒
1.
The specific features of freshwater bodies are shown to facilitate the accumulation of oil products in bottom deposits. The oil product components are found to be represented by hydrocarbons and tars. The latter component can account for more than 50% of their total. The extent of bottom deposits pollution by oil products is assessed for a number of freshwater bodies in Russia. 相似文献
2.
A. V. Zhulidov J. V. Headley R. D. Robarts A. M. Nikanorov A. A. Ischenko M. A. Champ 《Marine pollution bulletin》1997,35(7-12):252-259
The spatial distribution of the concentrations of heavy metals Cd, Pb, Zn and Cu were studied for contaminated wetlands located by industrial centres and villages influenced by anthropogenic contamination in the Russian Arctic. For comparison, non-contaminated wetlands were also studied in neighbouring areas. Samples were collected during the period 1977–1994 and included: (a) water, (b) particulate matter, (c) bottom sediments, (d) hydric soils and (e) hummock bog peat and polygonal bog peat. For impacted wetlands, the observed ranges for the concentrations of Cd, Pb, Zn, and Cu in water were 0.12–0.8, 0.9–2.5, 2.4–15 and 16–34 μg l−1, respectively. For (b)- (e) the corresponding values were [1.2–5.4; 24–37; 120–320; 80–116]; [6.4–17; 34–59; 240–570; 115–280]; [10–32; 57–78; 315–480; 87–350] and [5.1–53; 51–150; 125–520; 80–440] mg/kg, dry wt, respectively. The metal concentrations were up to 1000 times higher than background levels determined for non-contaminated wetlands in the Russian Arctic. The contaminants appear to be a direct result of localized anthropogenic activity, arising primarily from geoprospecting, the oil and coal industry, and domestic waste. 相似文献
3.
Nikanorov A. M. Khoruzhaya T. A. Stradomskaya A. G. Mironova T. V. 《Water Resources》2004,31(2):189-194
The toxicity of river water in the Lower Don basin was studied using biotesting with different biological objects. Water taken from most examined reaches of the Don and its tributaries was shown to exert toxic effect on crustaceans, algae, protozoa, and Rotifera. 相似文献
4.
5.
In order to study the effect of pollutants on intrabasin processes, a series of nature experiments has been made in natural
model ecosystems (mesocosms). The intensity of photosynthetic production and organic matter destruction have been studied
as generalized thermodynamical parameters of the state of the ecosystem. On the basis of the ratio between destruction and
overall production, dynamical phase patterns have been built. Analysis has shown that the dynamics of the state of the ecosystem
described by these parameters corresponds to general regularities of the evolution of the state of dissipative systems. Consequently,
the destruction-to-production ratio can be considered as a thermodynamic criterion for assessment in the evolution of the
state of water ecosystems. On the basis of this criterion, and with the help of the approach proposed, methods of ecological
load normalization can be elaborated. 相似文献
6.
Ways to improve the pesticide content observations in surface water bodies of the Russian Federation
Considered is the dynamics of pesticide content in surface water bodies of the Russian Federation during the long-term period. Demonstrated are the key directions of improving and optimizing observations of pesticide content in surface waters. Proposed is a priority list of pesticides recommended to be determined in water bodies of the country based on the known criteria of estimating the potential hazard of pesticides. 相似文献
7.
A. M. Nikanorov L. P. Sokolova O. S. Reshetnyak M. Yu. Kondakova A. O. Danilenko 《Russian Meteorology and Hydrology》2010,35(4):281-288
The results of calculation and analysis of the inflow of dissolved chemical substances to the estuarine area of the Northern
Dvina River are considered. Based on the long-term regime hydrochemical information of the State Service of Observation and
Monitoring of the Natural Environmental State, the anthropogenic load of dissolved chemical substances on the estuarine area
and on the estuarine coastal water is estimated per inflow volumes. The extent of the water environment pollution of the near-delta
part of the Northern Dvina River and its delta is estimated. The distribution of pollutant inflow among arms and channels
in delta is under consideration. 相似文献
8.
A. M. Nikanorov L. I. Minina V. A. Bruzgalo L. S. Kosmenko M. Yu. Kondakova O. S. Reshetnyak A. O. Danilenko 《Water Resources》2016,43(5):791-802
Many-year variations of water pollution and the state of more than two hundred of rivers (or their segments) in different latitudinal zones in European Russia are estimated. In accordance with latitudinal zonality, space and time trends in variations of water quality and the state of rivers are identified. By the level of water pollution, most river ecosystems (or their segments) were classified as polluted and very polluted, very polluted and dirty, dirty and very dirty. A tendency toward water quality improvement could be seen in the recent decade. More than 50% of the examined river ecosystems are at the transitional state of passing from natural (and/or equilibrium) to crisis state. 相似文献
9.
In coastal populations of invertebrates and fishes, the distribution of discrete subpopulations is influenced by adult and larval dispersal, as well as by the effects of habitat heterogeneity on site fidelity or connectivity. Here, we examine evidence for spatial structure of sea perch, Helicolenus percoides, populations among four fjords in the Fiordland region of southwestern New Zealand. We examine patterns in adult morphology, length-at-age, δ13C and δ15N of muscle tissue, and trace elemental composition of whole otoliths as proxies for population isolation among the four inner fjord regions. A multivariate analysis of morphometrics reveals significant differences among populations from each of the four sites, suggesting existence of four distinct subpopulations. These patterns are consistent with observed differences in δ13C and δ15N, and length-at-age estimates among the four subpopulations. Differences in whole otolith concentrations of Sr, Ba, Mg and Li, and high classification scores based on the whole otolith elemental fingerprint are also consistent with significant subdivision among areas. Patterns across all four markers are consistent with discrete subpopulation structure of adult sea perch among the four study sites. These data indicate that the newly implemented network of marine protected areas in Fiordland is likely to contain discrete populations of sea perch. 相似文献
10.