Canonical correspondence analysis
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In this paper, some important statistical techniques, including principal component analysis (PCA), canonical correspondence analysis (CCA) and cluster analysis, are explained briefly. Each of them is also examined by a corresponding case-study.
6p viwilliamleiding 10-12-2021 13 1 Download
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Within the scope of the European Union Water Framework Directive, diatom assemblages as biological quality components were used to evaluate the ecological status of 12 surface waters in the Araban-Yavuzeli catchment between October 2013 and October 2014. A total of 75 diatom species were identified during the study period. Amphora ovalis, Denticula elegans, Gomphonema parvulum, Gomphonema truncatum, and Navicula cryptocephala were commonly observed.
11p tudichquannguyet 29-11-2021 11 0 Download
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The present study aimed to elucidate relationships between phytoplankton species and stressors using multivariate approaches and assess the environmental condition of Burç Reservoir’s surface water using phytoplankton metrics from September 2018 to August 2019 according to implementations of the Water Framework Directive. Burç Reservoir had a characteristic of a warm monomictic pattern. Phytoplankton functional groups (E, F, J, LO, LM, MP, P, S1, T, and W1) were found in the reservoir. A significant difference was found in total biovolume values changed from 2.
18p tudichquannguyet 29-11-2021 10 1 Download
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Canonical correlation analysis (CCA) is a classic statistical tool for investigating complex multivariate data. Correspondingly, it has found many diverse applications, ranging from molecular biology and medicine to social science and finance.
13p vicoachella2711 27-10-2020 9 0 Download
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Nghiên cứu nhằm khảo sát về trạng thái phú dưỡng và mối tương quan giữa quần xã tảo lục với các thông số môi trường ở hồ Trị An. Mẫu được thu tại 6 vị trí từ tháng 3 năm 2016 đến tháng 2 năm 2017. Trạng thái phú dưỡng được đánh giá thông qua chỉ số TSI (Trophic State Index). Mối tương quan giữa các chỉ số với thông số môi trường được xác định bằng phân tích tương quan chính tắc CCA (Canonical Correspondence Analysis). Kết quả cho thấy khu hệ tảo lục ở hồ Trị An khá phong phú với 98 loài thuộc 4 lớp, 6 bộ, 16 họ, 31 chi, trong đó hai chi Staurastrum và Scenedesmus chiếm ưu thế về số loài.
10p angicungduoc2 02-01-2020 55 5 Download
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In the present study, the Biological diatom index (BDI) and the Trophic diatom index (TDI) were calculated for the assessment the ecological status and the water quality of the Sai Gon river in comparison with the physico-chemical variables. In addition, a multivariate method was used to elucidate the main environmental variables driving the diatom community. A total of 87 diatom species were identified and used to calculate the diatom indices.
7p caygaocaolon1 13-11-2019 23 0 Download
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We describe the spatial distribution of the genus Acantholimon Boiss. (Plumbaginaceae) taxa in Turkey, and assess the role that environmental variables may be playing on this distribution. We collected a large number of specimens from 418 geo-referenced sampling sites between 2000 and 2004, and established a point database using geographic information systems (GIS) software.
20p vibasque27 27-03-2019 20 3 Download
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Different populations of epiphytic lichens were studied in a microsite in Lower Nahal Keziv, Western Upper Galilee, Israel, which is designated as an “Evolution Canyon” (EC) II. In all, 24 lichen species from 5 orders, 11 families and 17 genera were registered, about one third of them (7 species) for the first time in Israel. Species richness was higher on the warmer, drier, climatically more fluctuating and biotically more heterogeneous south-facing slope (SFS).
13p vibasque27 27-03-2019 23 0 Download
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In the rainy and dry seasons the algal taxonomic compositions were very different, with prevailing diatoms in the winter and cyabobacteria and greens in summer. Bio-indication shows that the taxonomic preference for the self-purification process was more intensive during the rainy season, while the low level of river water in the dry season stressed the algal community.
20p vibasque27 27-03-2019 14 1 Download
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The composition of aquatic bryophyte and vascular plant assemblages, and 4 environmental variables (water velocity, shading, mean depth, and substrate type), together with altitude, ecological status, and river type were monitored at 223 sites along 204 rivers during 2009 in the Pontic Province and Eastern Balkan Ecoregions, Bulgaria.
12p vi4mua 24-02-2019 8 1 Download
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In January 2010, torrential rains that had suddenly swept away a limited area in the Eastern Desert facing Qena Province in Upper Egypt resulted in the enriching of the vegetation of some extremely dry wadis at this location. A vegetation survey carried out shortly after this event, in April, revealed the prevalence of annuals in considerable abundance, which are hardly recognisable in such usually dry habitats.
10p vi4mua 24-02-2019 18 1 Download
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The present study provides an analysis of floristic composition, vegetation types, and structure and species distribution at 20 sites, emphasising the environmental factors that affect species distribution.
14p vi4mua 24-02-2019 17 0 Download
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Triticeae Dumort. (Poaceae), or true grasses, the fifth-largest plant family in the world, are of great importance in terms of human life and civilization. Therefore, understanding the spatial distribution of the family members is important for botanists, plant producers, and breeders.
10p vikimsa 22-02-2019 12 0 Download
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In the summers of 2012 and 2013, vegetation of Thandiani in the Western Himalayas of Pakistan was surveyed and quantified. We took evidence from relationships between 252 species and 11 measured environmental factors as well as changes in the associations’ structure among 50 analysed stations with 1500 m2 plots.
15p vikimsa 22-02-2019 13 1 Download
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The research on algal communities’ response to altitude and altitude-related climatic conditions is sparse. So far, a full, accessible list of algae from the water bodies of the South-Tajik Depression has not been available.
34p vikimsa 22-02-2019 19 2 Download
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The segregation of these groups along the first two axes of the biplot demonstrated that soil texture, moisture content, salinity, sulfates, and organic matter contents were highly correlated with the distribution of species.
15p vikimsa 22-02-2019 35 1 Download
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The Bowman–Birk protease inhibitors have recently attracted attention for their potential as cancer preventive and suppressing agents. They contain two canonical binding loops, both consisting of nine highly conserved resi-dues capable of inhibiting corresponding serine proteases.
14p mobifone23 18-01-2013 42 4 Download
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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "Canonical correspondence analysis for forest site classification. A case study...
10p toshiba6 07-10-2011 70 2 Download