Distribution of certain soil inhabiting chytrid and chytridiaceous species related to some physical and chemical factors

1971 ◽  
Vol 49 (10) ◽  
pp. 1743-1755 ◽  
Author(s):  
Tom Booth
Keyword(s):  
Organic Matter ◽  
Standard Deviation ◽  
Environmental Factors ◽  
Environmental Parameters ◽  
Physical Parameters ◽  
Ecological Studies ◽  
Mean Values ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Linear Correlations

Most ecological studies of chytrids and chytridiaceous fungi in soils are primarily distributional, and autecological information for particular species is scant. In this study the distribution of 11 species, Schizochytrium aggregatum, Thraustochytrium roseum, Chytriomyces hyalinus, Rhizophlyctis harderi, Rhizophydium sp. (utriculare?), R. sphaerocarpum, R. carpophilum, R. sphaerotheca, Phlyctochytrium chaetiferum, P. palustre, and P. reinboldtae, is numerically expressed by an index (DII) derived from occurrence and frequency for 19 habitats. Mean values of various environmental parameters—pH, organic matter, bulk density, osmolarity, Ca2+, Mg2+, and Na+—are calculated for each habitat, and linear correlations of DII against means of the environmental factors of each habitat are calculated for each species. Also the range, mean, and standard deviation of chemical and physical parameters at sites where each species occurs are calculated. By these methods some autecological facts appear for each species. Basically the fungi are divisible into four groups: (1) obligately marine, S. aggregatum; (2) marine, T. roseum; (3) facultatively marine, C. hyalinus, R. harderi, R. sphaerocarpum, P. chaetiferum, R. carpophilum, R. sphaerotheca, Rhizophydium sp. (utriculare?); and (4) marine occasionals, P. palustre, P. reinboldtae. Problematic aspects of the study are discussed and another line of investigation is proposed.

Physical and chemical factors affecting microbial biomass and activity in contaminated subsurface riverine sediments

2006 ◽  
Vol 52 (5) ◽  
pp. 397-403 ◽  
Author(s):  
Jennifer J Mosher ◽  
Robert H Findlay ◽  
Carl G Johnston
Keyword(s):  
Microbial Biomass ◽  
Microbial Activity ◽  
River Sediments ◽  
Environmental Parameters ◽  
Industrial Effluents ◽  
Factors Affecting ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Water Holding ◽  
Direct Discharge

Over 80 years of direct discharge of industrial effluents into the Mahoning River, located in northeastern Ohio, USA, has led to the accumulation of a wide variety of pollutants within its sediments. This study examined the physical and chemical parameters, including lipophilic pollutants, affecting microbial activity and biomass in subsurface (10–40 cm horizon) sediments. Microbial biomass was higher in anthropogenically contaminated sediments, and step-wise linear regression showed that approximately 82% of the variation in microbial biomass could be explained by total hexane extractable hydrocarbons, sediment particle size, and water content. There was no correlation between microbial activity and biomass. Independent variables influencing anaerobic activity were temperature and water holding capacity. The results of this study indicate that freshwater, sedimentary anaerobic microbial communities respond to a range of environmental parameters, many of which influence subsurface river sediments, and that lipophilic pollutants, when present, can cause increases in total microbial biomass.Key words: microbial activity, microbial biomass, anaerobic sediments, PAH, metals.

Analysis on Relationship of Chlorophyll-a and Environmental Factors in Wuliangsuhai Lake

2012 ◽  
Vol 178-181 ◽  
pp. 804-807
Author(s):  
Zhong Feng Jiang ◽  
Chang You Li ◽  
Sheng Zhang
Keyword(s):  
System Theory ◽  
Environmental Factors ◽  
Chlorophyll A ◽  
Grey System Theory ◽  
Grey System ◽  
Connection Method ◽  
Chemical Factors ◽  
Research Relationships ◽  
Relationship Of ◽  
Physical And Chemical

Using grey system theory to research relationships between Chlorophyll-a and environmental factors in Wuliangsuhai lake was done in the present study. The effects of physical and chemical factors on chlorophyll-a in Wuliangsuhai lake, were evaluated by using of the gray connection method, providing a row order of those effects, and creating the “advantage factors” that exhibited the greatest effects on chlorophyll-a in wuliangsuhai lake, including temperature、illumination、EC、SD.

Environmental parameters influencing the distribution of Platanthera blephariglottis and Platanthera clavellata (Orchidaceae) in peatlands on the Avalon Peninsula, Newfoundland

1997 ◽  
Vol 75 (6) ◽  
pp. 974-980 ◽  
Author(s):  
C. J. Brown ◽  
P. J. Scott
Keyword(s):  
Organic Matter ◽  
Environmental Factors ◽  
Key Words ◽  
Water Level ◽  
Environmental Parameters ◽  
Individual Species ◽  
Terrestrial Species ◽  
Water Ph ◽  
Avalon Peninsula

Populations of two terrestrial species of orchids, Platanthera blephariglottis (Willd.) Lindl. and Platanthera clavellata (Michx.) Luer, were investigated for two field seasons (1991-1992) to determine what environmental factors (substrate constituents, water pH, water level) may influence their distributions within a peatland. Peat constituent values (magnesium, phosphorus, nitrogen, potassium, iron, calcium, pH, moisture, organic matter, ash) associated with individual species were, for the most part, not significantly different among sites or between species, although the values associated with P. clavellata tended to be higher and to have a greater range than those associated with P. blephariglottis. Water level values associated with species were significantly different between species, suggesting mat it is on this basis that these species partition their habitat. Key words: water level, environmental parameters, distribution, peatland, Platanthera blephariglottis, Platanthera clavellata.

scholarly journals Characterization of the physical and chemical parameters of Ubatuba Bay, Northern Coast of São Paulo State, Brazil

1999 ◽  
Vol 59 (1) ◽  
pp. 23-31 ◽  
Author(s):  
F. L. M. MANTELATTO ◽  
A. FRANSOZO
Keyword(s):  
Dissolved Oxygen ◽  
Organic Matter Content ◽  
Environmental Parameters ◽  
Size Composition ◽  
Organic Content ◽  
Matter Content ◽  
Northern Coast ◽  
Mean Values ◽  
Close Relationship ◽  
Physical And Chemical

The objective of the present study is to characterize the physical and chemical environmental parameters of Ubatuba Bay (SP), as a subsidy for studies of the composition and distribution of benthic crustaceans which live on the non-consolidated sublittoral bottom of this area. Depth, temperature, salinity, dissolved oxygen, organic content and granulometric composition of the sediments were measured monthly from September/95 to August/96 in eight subareas of the bay. The bay presents an average depth of 9.3 m and is characterized by the following annual mean values for the hydrologic factors: temperature 23.8 ºC, salinity 33.2‰ and dissolved oxygen 5.11 mg/l. The annual mean for the organic matter content of the bay bottom sediments was 11.8% and most subareas presented a grain size composition dominated by pelitic sediments. These peculiar abiotic characteristics are very important for the reproduction and development principally of brachyuran and anomuran crabs, and shrimps which have a close relationship with those substrates.

scholarly journals Bryophyte communities and seston in a karst stream (Jankovac Stream, Papuk Nature Park, Croatia)

2012 ◽  
Vol 48 (1) ◽  
pp. 125-138 ◽  
Author(s):  
Maria Špoljar ◽  
Tvrtko Dražina ◽  
Ana Ostojić ◽  
Marko Miliša ◽  
Marija Gligora Udovič ◽  
...  
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Environmental Factors ◽  
Environmental Parameters ◽  
Community Diversity ◽  
Nature Park ◽  
Community Assemblages ◽  
Abundance And Diversity ◽  
Bottom Cover ◽  
Source Site

An investigation into bryophyte communities in karst Jankovac Stream (Papuk Nature Park, Croatia) was carried out once a month from July 2008 to June 2009. Samples were taken from two lotic microhabitats: (i) Jankovac Spring (JS), a hypocrenal habitat with dense bryophyte clusters (90% bottom cover) and (ii) Jankovac Waterfall (JW), with scattered bryophyte clusters (50% bottom cover). At the same time, seston samples were collected during the spring as the source site and after the JW, as the outflow site. The goals of this study were to understand the (i) algal, protozoan and metazoan bryophyte community assemblages in these two lotic microhabitats, (ii) influence of environmental factors on the structuring of the bryophyte community and (iii) structure of seston along the longitudinal profile. A total of 172 taxa were determined: 68 algae, 55 protozoa, 24 meiofauna and 25 macroinvertebrates. Statistically significant differences between two microhabitats differing in percentage of bryophyte cover were established testing 13 environmental parameters. In dense bryophyte clusters, community structure was determined by flow velocity and pH, and macroinvertebrates achieved higher diversity and abundance. On the contrary, in scattered bryophyte coverage algae, protozoa and meiofauna reached higher abundance and diversity governed by the amount of suspended organic matter and epiphyton. In contrast to previous studies, the inverse ratio of community diversity and abundanceversuspercentage of bryophyte cover was established. We assume this to be the result of an enrichment of the scattered bryophyte clusters by upstream seston. Additionally, the effects of anthropogenic hydromorphological disturbance are reflected in macroinvertebrate diversity and abundance reduction.

scholarly journals ANALISIS KESESUAIAN PERAIRAN TELUK LHOK RIGAH SEBAGAI LOKASI BUDIDAYA IKAN KERAPU BEBEK (Cromileptes altivelis) DENGAN SISTEM KERAMBA JARING APUNG (KJA)

2017 ◽  
Vol 4 (1) ◽  
pp. 33
Author(s):  
Ika Kusumawati ◽  
Muhammad Arif Nasution ◽  
Riska Diana
Keyword(s):  
Fish Farming ◽  
Mean Value ◽  
Physical Parameters ◽  
Sampling Point ◽  
Chemical Parameters ◽  
Mean Values ◽  
Global Positioning ◽  
High Level ◽  
Physical And Chemical ◽  
Survey Approach

Humpback grouper requires suitable water quality for life whether physics, biology, or chemistry aspect. The purpose of this study is to determine the physical indicators, chemical parameters, and the appropriateness level of waters for potentially conducting fish farming activities of Humpback grouper by employing floating cage in waters of Bay Rigaih, Aceh Jaya District. Researcher conducted the study from August to September 2016 and employed survey approach. Determining the location of the sampling point is by using purposive sampling. The sampling coordinates recorded with the Global Positioning System (GPS). Based on data from research sampling, The results show mean value for each physical parameters such as: a). The depth is 9.5 m; b). the brightness is 3.7 m; c). water temperature is27,66 oc; d). The current speed is 20.25 cm/sec. Samples of some stations show mean values of chemical parameters such as: a). DO is 7.65 mg / l; b). pH is 7.59; c). salinity is 38.75 ppt. The High level of appropriatenessfor humpback grouper farming was shown at station 4 for every physical and chemical parameter, so itconcludesthat station 4 meet the criteria of quality waters for the development

scholarly journals Uncertainties Analysis of Collapse Susceptibility Prediction Based on Remote Sensing and GIS: Influences of Different Data-Based Models and Connections between Collapses and Environmental Factors

2020 ◽  
Vol 12 (24) ◽  
pp. 4134
Author(s):  
Wenbin Li ◽  
Xuanmei Fan ◽  
Faming Huang ◽  
Wei Chen ◽  
Haoyuan Hong ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Environmental Factors ◽  
Mean Value ◽  
Information Value ◽  
The Other ◽  
Weight Of Evidence ◽  
Coupled Models ◽  
Mean Values ◽  
Large Standard Deviation ◽  
Average Rank

To study the uncertainties of a collapse susceptibility prediction (CSP) under the coupled conditions of different data-based models and different connection methods between collapses and environmental factors, An’yuan County in China with 108 collapses is used as the study case, and 11 environmental factors are acquired by data analysis of Landsat TM 8 and high-resolution aerial images, using a hydrological and topographical spatial analysis of Digital Elevation Modeling in ArcGIS 10.2 software. Accordingly, 20 coupled conditions are proposed for CSP with five different connection methods (Probability Statistics (PSs), Frequency Ratio (FR), Information Value (IV), Index of Entropy (IOE) and Weight of Evidence (WOE)) and four data-based models (Analytic Hierarchy Process (AHP), Multiple Linear Regression (MLR), C5.0 Decision Tree (C5.0 DT) and Random Forest (RF)). Finally, the CSP uncertainties are assessed using the area under receiver operation curve (AUC), mean value, standard deviation and significance test, respectively. Results show that: (1) the WOE-based models have the highest AUC accuracy, lowest mean values and average rank, and a relatively large standard deviation; the mean values and average rank of all the FR-, IV- and IOE-based models are relatively large with low standard deviations; meanwhile, the AUC accuracies of FR-, IV- and IOE-based models are consistent but higher than those of the PS-based model. Hence, the WOE exhibits a greater spatial correlation performance than the other four methods. (2) Among all the data-based models, the RF model has the highest AUC accuracy, lowest mean value and mean rank, and a relatively large standard deviation. The CSP performance of the RF model is followed by the C5.0 DT, MLR and AHP models, respectively. (3) Under the coupled conditions, the WOE-RF model has the highest AUC accuracy, a relatively low mean value and average rank, and a high standard deviation. The PS-AHP model is opposite to the WOE-RF model. (4) In addition, the coupled models show slightly better CSP performances than those of the single data-based models not considering connect methods. The CSP performance of the other models falls somewhere in between. It is concluded that the WOE-RF is the most appropriate coupled condition for CSP than the other models.

scholarly journals Modelling ecological specificities of freshwater molluscs: the exemplary case of Bythinella austriaca (v. Frauenfeld 1857) (Gastropoda, Prosobranchia)

2016 ◽  
Author(s):  
Robert Sturm
Keyword(s):  
Environmental Factors ◽  
Weighted Average ◽  
Ecological Niches ◽  
Freshwater Molluscs ◽  
Ability To Act ◽  
Average Analysis ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Related Population

<p>Main objective of the study was the description of Weighted Average Analysis (WAA) as appropriate mathematical method for modelling the demands of freshwater molluscs on their habitats. With this approach site-specific environmental factors defining a certain biotope are weighted by the related population density of a selected organism. This allows the determination of optimum ranges of physical and chemical factors, within which highest probabilities of occurrence of the investigated organism may be expected. As an exemplary case ecological demands of the Austrian spring snail, <em>Bythinella austriaca</em>, were modelled by using WAA. In addition, a global marginality coefficient, which reflects the ability of the gastropod to occupy ecological niches, and a global tolerance coefficient, describing the width of the niche colonized by the organism, were computed for 10 selected environmental factors. As suggested by the modelling results, <em>B. austriaca </em>exhibits specialist behaviour with regard to water temperature, electric conductivity, dissolved oxygen, and dissolved nitrate. Furthermore, the gastropod only tolerates small fluctuations of these environmental factors, which remarkably reduces its ability to act as a pioneer species. </p>

The Influence of Physical Parameters on the Mechanical Characteristics of Some Volcanic Magmatic Rocks of the Andesite Type

Mining Revue ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 30-41
Author(s):  
Ciprian Danciu ◽  
Diana Marchiș ◽  
Simona Cucăilă
Keyword(s):  
Mechanical Characteristics ◽  
Strength Characteristics ◽  
Physical Parameters ◽  
Internal Factors ◽  
Hard Rocks ◽  
Magmatic Rocks ◽  
Mineral Components ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Physical And Mechanical Characteristics

Abstract The factors that influence the strength characteristics of rocks can be different in nature, being divided into external and internal factors. The mechanical properties of hard rocks are a result of geological, physical and chemical factors. In order to highlight the physical parameters that influence the strength characteristics of the rocks, in this paper there were analyzed six types of volcanic magmatic rocks such as andesites. In terms of stress behavior, rocks are directly influenced by their physical properties, such as volumetric density, porosity, compactness, moisture and the degree of alteration of mineral components. For this purpose, several sets of tests were performed to determine the physical and mechanical characteristics of the rocks, based on which it was possible to analyze how the physical parameters influence the strength characteristics.

scholarly journals Effects of physical and chemical factors on Ephemeroptera (Insecta) assemblages in an urban river of the eastern Colombian Llanos

2021 ◽  
Vol 61 ◽  
pp. e20216107
Author(s):  
Jose Ismael Rojas-Peña ◽  
Jesús Manuel Vásquez-Ramos ◽  
Luis Gonzalo Salinas-Jiménez ◽  
Diana Paola Osorio-Ramirez ◽  
Clara Inés Caro-Caro
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Urban Area ◽  
High Sensitivity ◽  
Tropical Streams ◽  
New Genera ◽  
Physical Chemical ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Low Precipitation

The mayflies are insects widely known as indicators of aquatic quality in freshwater systems, they are abundant and diverse in tropical streams. In this study, it was determined the influence of physical, chemical and bacteriological characteristics on the Ephemeroptera assembly in a period of low precipitation in the Ocoa river of Meta department. There were 5,332 nymphs belonging to 4 families, 10 genera and 3 species. Three new genera records and one species are presented for Meta: Cloeodes, Zelusia, Lumahyphes and Americabaetis alphus. The genera Camelobaetidius and Varipes were found associated with conditions of contamination by organic matter and water mineralization. Likewise, Americabaetis, Thraulodes, Lumahyphes and Tricorythodes were associated with contamination conditions, especially with nitrites and nitrates. Nanomis, Cloeodes and Zelusia showed greater sensitivity to the contamination condition and were related to high percentages of dissolved oxygen in the water and they were in the sampling stations of the upper part in the river. It is important to mention that there were not Ephemeroptera in most of the stations associated with the urban area. That reflects their high sensitivity to polluting conditions at low precipitation period.

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