scholarly journals The distribution of bluegrass (Poa L., Poaceae), section Stenopoa Dumort. within the Altai Mountain Country

2020 ◽  
Vol 19 (2) ◽  
pp. 243-248
Author(s):  
M. V. Olonova ◽  
T. S. Vysokikh
Keyword(s):  
Spatial Distribution ◽  
Model Species ◽  
Altai Mountain ◽  
Distribution Study ◽  
Exact Location ◽  
Gis Technologies ◽  
Reliable Source ◽  
First Results ◽  
Species Groups ◽  
Mountain Country

The study of the formation and spatial distribution of biodiversity is currently one of the most importantproblems of biology. The use of modern GIS-technologies open up the great opportunities for research in the fieldof biogeography and ecology, but it requires a large amount of data on the exact location of the samples. Herbariumcollections are the most reliable source of this data. A detailed research of the model species groups are widely used in thestudy of florogenesis, so, a detailed study of such a model groups distribution seems to be very promising for solution ofbiogeographic problems. The first results of the bluegrass (Poa L.) distribution study within the Altai mountain country,obtained on the basis of local taxonomic database, are presented.

scholarly journals Modelling Maritime Pine (Pinus pinaster Aiton) Spatial Distribution and Productivity in Portugal: Tools for Forest Management

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 368
Author(s):  
Cristina Alegria ◽  
Natália Roque ◽  
Teresa Albuquerque ◽  
Paulo Fernandez ◽  
Maria Margarida Ribeiro
Keyword(s):  
Spatial Distribution ◽  
Forest Management ◽  
Species Distribution ◽  
Pinus Pinaster ◽  
Landscape Planning ◽  
Environmental Data ◽  
Maritime Pine ◽  
Future Climate Change ◽  
Sequential Simulation ◽  
Model Species

Research Highlights: Modelling species’ distribution and productivity is key to support integrated landscape planning, species’ afforestation, and sustainable forest management. Background and Objectives: Maritime pine (Pinus pinaster Aiton) forests in Portugal were lately affected by wildfires and measures to overcome this situation are needed. The aims of this study were: (1) to model species’ spatial distribution and productivity using a machine learning (ML) regression approach to produce current species’ distribution and productivity maps; (2) to model the species’ spatial productivity using a stochastic sequential simulation approach to produce the species’ current productivity map; (3) to produce the species’ potential distribution map, by using a ML classification approach to define species’ ecological envelope thresholds; and (4) to identify present and future key factors for the species’ afforestation and management. Materials and Methods: Spatial land cover/land use data, inventory, and environmental data (climate, topography, and soil) were used in a coupled ML regression and stochastic sequential simulation approaches to model species’ current and potential distributions and productivity. Results: Maritime pine spatial distribution modelling by the ML approach provided 69% fitting efficiency, while species productivity modelling achieved only 43%. The species’ potential area covered 60% of the country’s area, where 78% of the species’ forest inventory plots (1995) were found. The change in the Maritime pine stands’ age structure observed in the last decades is causing the species’ recovery by natural regeneration to be at risk. Conclusions: The maps produced allow for best site identification for species afforestation, wood production regulation support, landscape planning considering species’ diversity, and fire hazard mitigation. These maps were obtained by modelling using environmental covariates, such as climate attributes, so their projection in future climate change scenarios can be performed.

Phylogeny, taxonomy and biology of mites of the genera Chelacheles and Neochelacheles (Acari : Cheyletidae)

2004 ◽  
Vol 18 (5) ◽  
pp. 547 ◽  
Author(s):  
Andre V. Bochkov ◽  
Barry M. OConnor
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
North America ◽  
Taxonomic Revision ◽  
Single Species ◽  
Model Species ◽  
Species Groups

Taxonomic revision and parsimony-based phylogenetic analysis of species in two closely related genera of predaceous Cheyletidae, Chelacheles Baker and Neochelacheles Smiley & Williams, are conducted. Among species of these genera, C. algericus Fain & Bochkov, syn. nov. and C. humilis Rasool, Chaudhri & Akbar, syn. nov. are synonymised with C. strabismus Baker and C. bakeri Attiah, respectively. Six new species are described: C.�aigamuxa, sp. nov.; C. klimovi, sp. nov.; C. seminole, sp. nov.; C. temoak, sp. nov.; N. corpuzrarosae, sp. nov.; and N. mendicus, sp. nov. The genus Chelacheles includes two species-groups, strabismus (seven species) and peritremaculatus (seven species), and two ungrouped species, C. michalskii Samsinak and C. stigmaeoides Barilo. The genus Neochelacheles (three species) is represented by a single species from North America and by two Philippine endemics. New diagnoses of the genera are given as well as descriptions of postembryonic stages of a model species in each genus, a key, and redescriptions for most species. The biology of these mites is briefly discussed. Phylogenetic analysis indicates that the associations of some species with polypore bracket fungi have arisen independently in the genera Chelacheles and Neochelacheles.

scholarly journals Duvalius (Duvalius) lencinai Mateu & Ortuño, 2006 (Coleoptera, Carabidae, Trechini) una especie hipogea del sur de la península ibérica. Morfología, reubicación taxonómica, sistemática y biología

2013 ◽  
Vol 36 (2) ◽  
pp. 141-152
Author(s):  
V. M. Ortuño ◽  
◽  
P. Barranco ◽  
Keyword(s):  
Spatial Distribution ◽  
Iberian Peninsula ◽  
Type Locality ◽  
Temporal And Spatial Distribution ◽  
Municipal District ◽  
Arthropod Fauna ◽  
New Localities ◽  
Species Groups ◽  
Temporal And Spatial ◽  
Península Ibérica

Duvalius (Duvalius) lencinai Mateu & Ortuño, 2006 (Coleoptera, Carabidae, Trechini) a hypogean species from the south of the Iberian peninsula. Morphology, new taxonomic placement, systematics and biology Duvalius (Duvalius) lencinai Mateu & Ortuño, 2006 was discovered in two new localities in the municipal district of Siles (Jaen, Spain): Sima Curva del Espino and Sima de los 30 Años, approximately 10 and 17 km, respectively, away from the type locality. The study of several individuals through dissection and use of optic and electronic microscopic preparations has increased the knowledge of the anatomy of this species. Evagination of the internal sac allowed further study of the sclerotized structures and led to the proposal of a new placement for this species within the genus Trechus Clairville 1806: Trechus (Trechus) lencinai (Mateu & Ortuño, 2006) n. comb. Although it comprises characters of the T. fulvus group and the T. pyrenaeus group, the endophallus is more similar to several species of the T. quadristriatus group and the T. tingitanus group. It could not therefore be placed in any of the species groups proposed by Jeannel. Some data about its biology (temporal and spatial distribution) and accompanying arthropod fauna are given.

scholarly journals Notes on Potentilla (Rosaceae) of Altai. 8. A new species with a disjunctive area for the flora of Kazakhstan

Turczaninowia ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 144-155
Author(s):  
Aleksey A. Kechaykin ◽  
Norbert Bauer ◽  
Michail V. Skaptsov ◽  
Alexander I. Shmakov
Keyword(s):  
Flow Cytometry ◽  
New Species ◽  
Genome Size ◽  
Morphological Characters ◽  
Altai Mountain ◽  
Southwestern Part ◽  
New Finding ◽  
First Time ◽  
A New Species ◽  
Mountain Country

For the first time, the Potentilla laciniosa is reported for the flora of Kazakhstan and Altai Mountain Country with the exact location. After a large disjunction of the range, the species was found in the Kyzylbeltau mountains of the Urdzhar region in the southwestern part of the Tarbagatai ridge. Some morphological characters of the new finding are discussed in comparison with closely related taxa and data on the genome size obtained for the first time from seeds using the method of flow cytometry. The lectotypification of Potentilla laciniosa is carried out on the basis on the investigated herbarium material and literature sources.

scholarly journals Arabidopsis thaliana zinc accumulation in leaf trichomes is correlated with zinc concentration in leaves

2020 ◽  
Author(s):  
Felipe K. Ricachenevsky ◽  
Tracy Punshon ◽  
David E. Salt ◽  
Janette P. Fett ◽  
Mary Lou Guerinot
Keyword(s):  
Arabidopsis Thaliana ◽  
Spatial Distribution ◽  
Growth And Yield ◽  
Zn Deficiency ◽  
Model Species ◽  
Nutritional Disorder ◽  
Leaf Trichomes ◽  
Zn Accumulation ◽  
Zn Homeostasis ◽  
Zn Status

AbstractZinc (Zn) is a key micronutrient. In humans, Zn deficiency is a common nutritional disorder, and most people acquire dietary Zn from eating plants. In plants, Zn deficiency can decrease plant growth and yield. Understanding Zn homeostasis in plants can improve agriculture and human health. While root Zn transporters in plat model species have been characterized in detail, comparatively little is known about shoot processes controlling Zn concentrations and spatial distribution. Previous work showed that Zn hyperaccumulator species such as Arabidopsis halleri accumulate Zn and other metals in leaf trichomes. The model species Arabidopsis thaliana is a non-accumulating plant, and to date there is no systematic study regarding Zn accumulation in A. thaliana trichomes. Here, we used Synchrotron X-Ray Fluorescence mapping to show that Zn accumulates at the base of trichomes of A. thaliana, as had seen previously for hyperaccumulators. Using transgenic and natural accessions of A. thaliana that vary in bulk leaf Zn concentration, we demonstrated that higher leaf Zn increases total Zn found at the base of trichome cells. Furthermore, our data suggests that Zn accumulates in the trichome apoplast, likely associated with the cell wall. Our data indicates that Zn accumulation in trichomes is a function of the Zn status of the plant, and provides the basis for future studies on a genetically tractable plant species aiming at understanding the molecular steps involved in Zn spatial distribution in leaves.

Spatial distribution study of phosphorus forms in lake sediment

2019 ◽  
Vol 12 (9) ◽  
Author(s):  
Ali Dehbi ◽  
Hind Omari ◽  
Adil Lammini ◽  
Abdellah El Hmaidi ◽  
Abdelaziz Abdallaoui
Keyword(s):  
Spatial Distribution ◽  
Lake Sediment ◽  
Distribution Study ◽  
Phosphorus Forms

scholarly journals Observations of Atmospheric NO2 Using a New Low-Cost MAX-DOAS System

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 129 ◽  
Author(s):  
Adrian Roşu ◽  
Daniel-Eduard Constantin ◽  
Mirela Voiculescu ◽  
Maxim Arseni ◽  
Alexis Merlaud ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Optical Absorption ◽  
Low Cost ◽  
Trace Gases ◽  
Elevation Angle ◽  
Local Source ◽  
Optical Absorption Spectroscopy ◽  
Optic System ◽  
First Results ◽  
Spectroscopy System

This article describes the prototype of a new MAX-DOAS (multi-axis differential optical absorption spectroscopy) system built at “Dunarea de Jos” University of Galati (UGAL), Romania, and the first results of its use to observe NO2 content over Galati city (45.42° N, 28.04° E). The new equipment is a ground-based MAX-DOAS system capable of measuring the spatial distribution of DSCD (differential slant column densities) of several trace gases using horizontal and vertical observations. The new optic system, named UGAL-2-DOAS, is an in-house, low-cost, solution in comparison to the existing market of the MAX-DOAS systems. This paper describes the technical design and capabilities of the new MAX-DOAS instrument. The UGAL-2D-DOAS system was tested in April and June 2017 in Galati city. Measurements over three days were selected for the present manuscript. Full azimuthal (0–360°), local celestial meridian observations and other elevation angle sequence measurements (e.g., E–W) were performed. We found that the new MAX-DOAS system is able to detect diurnal variation and the local source emissions of NO2 from the urban environment. Also, we present concomitant zenith-sky car-DOAS observations measurements around the location of the new MAX-DOAS instrument. Comparing the horizontal scanning sequence of the new developed instrument with the mobile DOAS observations, we found that both systems can indicate and detect the same NO2 sources.

Magnetic fabric of Devonian and Precambrian dikes from the northeastern Kola Peninsula, Russia

2021 ◽  
Author(s):  
Sofya Fursova ◽  
Roman Veselovskiy
Keyword(s):  
Magnetic Susceptibility ◽  
Spatial Distribution ◽  
Kola Peninsula ◽  
Magnetic Fabric ◽  
Laboratory Studies ◽  
Magma Flow ◽  
Northeastern Part ◽  
Geological Age ◽  
First Results ◽  
Magma Sources

<p>Nowadays, anisotropy of magnetic susceptibility (AMS) is a very widespread method to investigate the magnetic fabric of the rocks. AMS studies provide the information on the magma flow during formation of intrusives (dikes and sills) based on the orientation of the AMS ellipsoid. In this work we present the results of the AMS measurements of Devonian, Paleoproterozoic and Neoarchean dikes, which are located on the northeastern part of the Kola Peninsula. We use these data to reconstruct the direction of magma flow with the final aim to reconstruct the spatial distribution of the magma sources.</p><p>Laboratory studies of AMS were carried out on 1282 samples representing 102 dikes. At this stage, all studied dikes were typified based on their geological age and type of AMS (normal, reversed, intermediate). It is shown that not all the studied intrusive bodies retained the primary magnetic fabric and only a few of them can be used to reconstruct the position of magmatic centers and are promising for obtaining reliable paleomagnetic data. We also present the first results of interpretation of the direction of the magma flow during dike swarms forming.</p><p>The study is supported by the grant of RSF #16-17-10260.</p>

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