Dependence of ecological characteristics of macrobenthos on content of organic matter in the coastal zone of the Japan Sea

2014 ◽  
Vol 176 (1) ◽  
pp. 233-239
Author(s):  
Yulia A. Galysheva ◽  
Alexey A. Somov
Keyword(s):  
Organic Matter ◽  
Species Diversity ◽  
Trophic Structure ◽  
Diversity Index ◽  
Total Content ◽  
Japan Sea ◽  
Organic Content ◽  
Chemical Parameters ◽  
Ecological Optimum ◽  
The Japan Sea

Inflow and accumulation of organic matter in the bays at Russian coast of the Japan Sea are evaluated using the data on chemical parameters of seawater and total content of carbon in the bottom sediments. Complex index of organic content in the environment (CIOCE) is proposed. Shannon diversity index (I) and the index of trophic structure disturbance (ITSD) are assessed for macrobenthos of these areas and compared with CIOCE; non-linear parabolic dependence is revealed with the 90 % confidence level. The value of CIOCE ecological optimum (when macrobenthos has the highest species diversity and healthy trophic structure) is determined as 1.5-2.5; both higher and lower CIOCE values cause reduction of species diversity and disturbance of trophic structure that means that the organic matter supply is favorable for macrobenthos until a certain threshold.

Vertical micro-distribution of psammonic ciliates and their relationship to physical and chemical parameters in two lakes of different trophic status

2012 ◽  
Vol 41 (2) ◽  
Author(s):  
Tomasz Mieczan ◽  
Dorota Nawrot
Keyword(s):  
Surface Layer ◽  
Community Structure ◽  
Species Diversity ◽  
Trophic Structure ◽  
Trophic Status ◽  
Chemical Parameters ◽  
Water Parameters ◽  
Physical And Chemical Parameters ◽  
Physical And Chemical ◽  
Chemical Water

AbstractThe aim of this study was to examine the community structure and vertical micro-distribution of psammonic ciliates in two lakes of different trophic status in eastern Poland. Additionally, the size and trophic structure of these microorganisms, and the influence of physical and chemical water parameters on their abundance, were analysed. Psammon samples were collected during spring, summer, and autumn of 2010. In each of the lakes samples were collected in the euarenal, higroarenal, and hydroarenal zones of the psammolittoral. In order to determine the micro-vertical distribution of ciliates, each sample was divided into two sub-samples: the upper part (0–1cm) and the lower part (1–2cm). The species diversity of ciliates decreased with depth. The tendency was particularly clear in mesotrophic lakes. Irrespective of the lake’s trophic type and arenal zones, significantly higher numbers and biomass of ciliates were recorded in the surface layer of the psammolittoral. The upper layer of sand was dominated by omnivorous taxa, whereas the deeper layer showed increases in the proportions of bacterivore species. The factors limiting the occurrence of ciliates are mainly concentrations of total organic carbon and nutrients.

scholarly journals Accumulation of humic-like fluorescent dissolved organic matter in the Japan Sea

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Kazuki Tanaka ◽  
Kenshi Kuma ◽  
Koji Hamasaki ◽  
Youhei Yamashita
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Japan Sea ◽  
Fluorescent Dissolved Organic Matter ◽  
The Japan Sea

scholarly journals Impact of Land Use Changes on Soil and Vegetation Characteristics in Fereydan, Iran

Agriculture ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 58 ◽  
Author(s):  
Hanieh Eghdami ◽  
Ghanimat Azhdari ◽  
Philippe Lebailly ◽  
Hossein Azadi
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Species Diversity ◽  
Diversity Index ◽  
Good Condition ◽  
Organic Matter Content ◽  
Matter Content ◽  
Influential Factor ◽  
Species Diversity Index ◽  
Significant Difference

To understand and manage ecosystem complexity, it is important to determine the relationships between soil characteristics, human activities, and biodiversity. This study analyzes the relationships between vegetation, soil, and man-made damage with regards to land use change in the Fereydan region, Iran. Soil physical properties such as sand and silt content, clay, saturated soil’s moisture content, and gravel percentage as well as chemical properties such as lime content, pH, electro conductivity (EC), and organic matter content were measured. In order to trace these variables, the principle component analysis (PCA) was applied. The study area was divided into three states of conditions; i.e., good condition rangelands, poor condition rangelands, and abandoned rain-fed area. Based on the results there was a significant difference between species diversity in good condition rangelands compared with two other sites. The results further revealed that among soil chemical and physical characteristics, only soil organic matter had a significant difference between different rangeland sites. According to the results, the rangelands with good conditions had the highest amount of organic matter (1.43–1.50%) compared with two other studied rangelands (poor conditions: 1.02–1.09%; abandoned rain-fed: 1.2–1.46%). The most influential factor on the species diversity index was the distance to village parameter that revealed the important role of humans in degrading rangelands and reducing species diversity.

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