Determination of (palaeo-)ecological preferences of dinoflagellates by applying Detrended and Canonical Correspondence analysis to Late Pliocene dinoflagellate cyst assemblages of the south Italian Singa section

1994 ◽  
Vol 84 (1-2) ◽  
pp. 181-199 ◽  
Author(s):  
Gerard J.M. Versteegh ◽  
Karin A.F. Zonneveld
Keyword(s):  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
The South ◽  
Late Pliocene ◽  
Dinoflagellate Cyst ◽  
Ecological Preferences

The vegetation and ecological gradients of calcareous mires in the South Park valley, Colorado

2003 ◽  
Vol 81 (3) ◽  
pp. 201-219 ◽  
Author(s):  
J Bradley Johnson ◽  
David A Steingraeber
Keyword(s):  
Water Table ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Environmental Conditions ◽  
Detrended Correspondence Analysis ◽  
Nutrient Level ◽  
Ecological Gradients ◽  
The South ◽  
Rich Fen ◽  
South Park

The vegetation, environment, and ecological gradients present on three calcareous mires in the South Park valley, Park County, Colorado, were investigated. Vegetation was classified into four habitat classes, nine subclasses, and twelve species associations using two-way species indicator analysis (TWINSPAN). Detrended correspondence analysis (DCA) was used to ordinate vegetation samples along two axes representing the three predominant ecological gradients: water table height, miremargin to expanse, and region. Canonical correspondence analysis (CCA) was used to directly relate local environmental conditions to vegetation. Water table depth, microtopographical development, soil and water pH and nutrient level, soil organic matter, and hydraulic head were significantly correlated with vegetation gradients. The mire soils consist of intermixed areas of organic and mineral soils. Mire soils and water are highly alkaline and nutrient-rich. Mean pore water calcium concentration on these mires is 115 mg/L, electrical conductivity averages 575 µS, and mean pH is 7.4. Owing to these conditions, the fen floras include a number of highly minerophilic species. Based on water chemistry and species criteria, each site was classified as rich to extremely rich fen, with the two fen types mixing in complex patterns according to local environmental conditions. The species Trichophorum pumilum, Salix candida, Salix myrtillifolia, Carex microglochin, Carex viridula, Carex scirpoidea, Eriophorum gracile, Triglochin maritimum, Triglochin palustris, Kobresia myosuroides, Kobresia simpliciuscula, Thalictrum alpinum, Scorpidium scorpioides, Scorpidium turgescens, and Calliergon trifarium were determined to be indicative of extremely rich fen conditions in the southern Rocky Mountains.Key words: Colorado, canonical correspondence analysis, detrended correspondence analysis, extremely rich fen, gradient analysis, mire.

Species-environment relationships in three woodlands using canonical correspondence analysis

1990 ◽  
Vol 55 ◽  
Author(s):  
R. Keymeulen ◽  
H. Beeckman
Keyword(s):  
Plant Communities ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Environmental Variables ◽  
Ecological Study ◽  
Basal Area ◽  
Environmental Variable ◽  
Light Penetration ◽  
Indicator Values

Relations  between plant communities and environment were investigated in an ecological  study in three woodlands in the south of Flanders, Belgium. The vegetation  was sampled and three environmental variables (light penetration, chemical  composition of the soil and species composition of the tree and shrub layer)  were measured. By application of canonical correspondence analysis (CCA),  relations between the vegetation and the environmental variables could be  evaluated. The percentage of Fagus sylvatica in the basal area seemed to be the most decisive environmental  variable determining the presence of plant communities. It could be derived  as well that CCA can be a very useful technique for the determination of the  indicator values of the species for their environment.

scholarly journals Bankfull discharge determination using the new Invertebrate Bankfull Assessment Method

2008 ◽  
Vol 12 (1) ◽  
pp. 145-153 ◽  
Author(s):  
Artur Radecki-Pawlik ◽  
Tomasz Skalski
Keyword(s):  
Cross Section ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Water Discharge ◽  
Assessment Method ◽  
Mountain Stream ◽  
Invertebrate Species ◽  
Bankfull Discharge ◽  
Method Of Determination

Bankfull discharge determination using the new Invertebrate Bankfull Assessment MethodAlong the paper the new method called Invertebrate Bankfull Assessment method (IBA method) of determination of bankfull discharge is presented. The investigation of bankfull discharge using IBA were performed within one Polish Carpathian stream in the mountain region: the Ochotnica Stream. As an index of bankfull the existence of certain species of invertebrates was used which are present and resistant to specific water discharge conditions. The borders within a cross section of the mountain stream with a gravel bed were defined where characteristic invertebrates are present which are recognized as bankfull borders. Finally three invertebrates benches (IB-ms) were recognized which are characterized by very specific invertebrate species. Bankfull discharge was calculated up to this IB-ms and corelated using Canonical Correspondence Analysis with other values of bankfull calculated for a cross section using different bankfull.

scholarly journals Short Communication: Distribution of dragonflies (Odonata: Insecta) in South Ural lakes, Russia

2018 ◽  
Vol 19 (1) ◽  
pp. 202-207 ◽  
Author(s):  
IRINA V. MASHKOVA ◽  
TATYANA G. KRUPNOVA ◽  
ANASTASIYA M. KOSTRYUKOVA ◽  
NIKITA E. VLASOV
Keyword(s):  
Species Richness ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Short Communication ◽  
Jaccard Index ◽  
South Urals ◽  
The South ◽  
Number Of Species

Mashkova IV, Krupnova TG, Kostryukova AM, Vlasov NE. 2018. Short Communication: Distribution of dragonflies (Odonata: Insecta) in South Ural lakes, Russia. Biodiversitas 19: 202-207. This paper studies the diversity and distribution of Odonata (Insecta) in the South Urals region lakes such as Lake Large Miassovo, Lake Small Miassovo, Lake Ilmenskoe, Lake Savelkul and Lake Baraus. We revised dragonflies in five lakes during May-September 2014-2016. Dragonflies and larvae were identified up to the species. As results, 36 species (12 Zygoptera and 22 Anisoptera) belonging to 15 genera were recorded. To compare the similarities of dragonfly communities of different lakes we used the Canonical Correspondence Analysis (CCA) according the Jaccard index. Comparing the number of records of odonate species for selected lakes in our study, we found that the small richness of species was typical for lakes Savelkul and Baraus (22% and 25% of the total number of species, respectively) and the large values of the species richness was obtained for lakes Small Miassovo, Ilmenskoe and Large Miassovo (50%, 72%% and 80% of the total number of species, respectively).

A DETERMINATION OF THE AMOUNT OF VITAMIN C IN SOME MEDICAL PLANTS GROWING IN THE SOUTH– WESTERN ZARAFSHAN MOUNTAIN RANGES

2018 ◽  
pp. 48-49
Author(s):  
P. Mirkhamidova ◽  
U. E. Khujanazarov ◽  
D. A. Mamatqulov ◽  
S. Ziyamukhamedova ◽  
G. I. Mukhamedov
Keyword(s):  
Vitamin C ◽  
The South ◽  
Mountain Ranges ◽  
Medical Plants

Environmental factors including management practices as correlates of weed community composition in spring seeded crops

1992 ◽  
Vol 70 (10) ◽  
pp. 1931-1939 ◽  
Author(s):  
M. R. T. Dale ◽  
A. G. Thomas ◽  
E. A. John
Keyword(s):  
Community Composition ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Environmental Variables ◽  
Management Practices ◽  
Geographic Region ◽  
Climatic Conditions ◽  
Weed Species ◽  
Weed Communities ◽  
Seed Crops

The relationship between the weed communities and environmental variables such as soil, crop, and management was investigated in two provinces of Canada. The frequencies of weed species were recorded in cereal and oilseed fields in Saskatchewan (2244 fields over 4 years) and Manitoba (864 fields over 3 years), Canada. Information on some of the physical characteristics of the fields and on the management practices imposed on them was also collected, in part by questionnaire. The two kinds of data were ordinated together using canonical correspondence analysis to assess the relationships between the species and the environmental variables. In the Saskatchewan data, there was a clear and consistent separation of the species into groups along an axis correlated with soil zone and the associated climatic gradient. In the Manitoba data, the same groups of species did not separate as clearly or as consistently, although geographic region was a major determinant of the weed communities. The greater variability may be due to the fact that the gradient of soil types is much more restricted in Manitoba and not as closely correlated with climatic conditions. In both provinces, culture practices were less important as correlates of the weed community composition than soil type or, to a certain extent, the previous crop. Key words: canonical correspondence analysis, cereal crops, oil seed crops.

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