scholarly journals Distribution Patterns of Grasshoppers and Their Kin in the Boreal Zone

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Michael G. Sergeev
Keyword(s):  
North America ◽  
Distribution Patterns ◽  
Monotypic Genus ◽  
Boreal Zone ◽  
Flood Plains ◽  
The North ◽  
Mountain Steppes ◽  
Different Types ◽  
Low Levels ◽  
North Western

The distribution patterns of Orthoptera are described for the boreal zone. The boreal fauna of Eurasia includes more than 81 species. Many of them are widely distributed. The monotypic genusParacyphoderrisStorozhenko and at least 13 species are endemics or subendemics. About 50 species are known from boreal North America. Four endemic species are distributed very locally. Relationships between the faunas of the Eurasian and North American parts of the boreal zone are relatively weak. The boreal assemblages are usually characterized by the low levels of species diversity and abundance. Grasshoppers and their relatives occupy almost exclusively open habitats, such as different types of meadows, mountain steppes and tundras, clearings, openings, bogs, and stony flood plains. The local endemics and subendemics are found only in some habitats of the eastern part of Eurasia and the north-western part of North America. Retrospective and prospective of the boreal fauna of Orthoptera are also discussed.

Kamiesbergia, a new monotypic genus of the Amaryllideae-Strumariinae (Amaryllidaceae) from the north-western Cape

Bothalia ◽  
1991 ◽  
Vol 21 (2) ◽  
pp. 171-175 ◽  
Author(s):  
D. A. Snijman
Keyword(s):  
South America ◽  
Western Cape ◽  
The Novel ◽  
Monotypic Genus ◽  
The North ◽  
Granite Outcrops ◽  
Andean South America ◽  
North Western

Kamiesbergia Snijman is a new monotypic genus from raised granite outcrops in the north-western Cape. A member of the subtribe Strumariinae of the Amaryllideae, it is most closely related to  Hessea Herb, and  Namaquanula D. U. Miiller-Doblies. The dissimilar inner and outer stamens, the uniquely club-shaped inner filaments and the novel insertion of the filament in the proximal quarter of the anther connective are the main apomorphies of the genus. The number of rare and monotypic genera of Amaryllidaceae in this region is comparable to that of Andean South America.

scholarly journals Interfertility between Armillaria cepistipes and A. sinapina

2005 ◽  
Vol 77 (2) ◽  
pp. 67-74 ◽  
Author(s):  
J.A. Bérubé ◽  
M. Dessureault ◽  
S. Berthelay ◽  
J.-J. Guillaumin
Keyword(s):  
North America ◽  
Sympatric Species ◽  
Biological Species ◽  
Malt Extract ◽  
Low Level ◽  
Different Types ◽  
Genetic Barriers ◽  
Low Levels ◽  
Incubation Temperatures ◽  
Armillaria Cepistipes

European strains of Armillaria cepistipes were reported to be interfertile with strains from three American Armillaria species known as North American Biological Species (NABS) V (A sinapina), NABS X and NABS XI. Such interfertility between species raises some doubts about using different Latin binomials for species capable of mating. This interfertility was reinvestigated by mating 24 haploid isolates of European A cepistipes with 23 isolates of A sinapinafrom North America and Asia. Individual pairings were independently performed at least once at Universite Laval, Canada and at INRA Clermont-Ferrand, France. From the 420 interspecific pairings performed at Laval, two were positive and seven were ambiguous for a total of 2.1% of all the pairings. From the 506 pairings made at Clermont-Ferrand, 10 were positive and 24 were ambiguous for a total of 6.7%. The differences in the pairing results may be explained by incubation temperatures, and the different types and concentrations of malt extract used at each laboratory. The low levels of interfertility found between A. cepistipes and A. sinapina may result from the absence of genetic barriers that are usually present between sympatric species. This low level of interfertility reflects differences in morphology, distribution, and habitat for these two species of Armillaria and this supports the retention of different species denominations.

scholarly journals A database of Holocene temperature records for north‐eastern North America and the north‐western Atlantic

2020 ◽  
Vol 7 (1) ◽  
pp. 38-43
Author(s):  
Simon van Bellen ◽  
Anne de Vernal ◽  
Anna To ◽  
Marie‐Michèle Ouellet‐Bernier ◽  
Natasha Roy ◽  
...  
Keyword(s):  
North America ◽  
Eastern North America ◽  
Western Atlantic ◽  
The North ◽  
North Eastern ◽  
Temperature Records ◽  
North Western

Qualitative research in accounting: the North American perspective

2014 ◽  
Vol 11 (4) ◽  
pp. 278-285 ◽  
Author(s):  
Richard Baker
Keyword(s):  
Qualitative Research ◽  
North America ◽  
North American ◽  
Design Methodology ◽  
Content Type ◽  
The North ◽  
American Perspective ◽  
Different Types ◽  
Qualitative Work ◽  
North American Perspective

Purpose – The purpose of this Special Issue of Qualitative Research in Accounting & Management is to focus on qualitative research in accounting from a North American perspective. The goal is to highlight the possibility of greater contributions to qualitative research in accounting from researchers based in North America and to highlight some significant contributions produced by authors in North American universities in the qualitative domain. Design/methodology/approach – The paper is conceptual in nature. Findings – This sample of North American qualitative research in accounting provides an example of some of the different types of qualitative work being done. In most respects the articles are similar to qualitative research being done in other parts of the world. Perhaps the key difference is that the research has been undertaken for the most part by senior researchers who have been able to take some risks with a research paradigm that may not be widely accepted at their universities or they may be fortunate to be located at universities which value such research. Originality/value – The paper broadens the view of qualitative research to North America where it appears that qualitative research has been relatively undervalued in recent years.

scholarly journals VARIABILITY OF THE GROUND MOLLUSK SHELL

2021 ◽  
Author(s):  
Ekaterina V. Komarova ◽  
◽  
Alexander A. Komarov ◽  
Elena A. Artemieva ◽  
Tamara G. Stojko ◽  
...  
Keyword(s):  
Growth Period ◽  
Shell Structures ◽  
Significant Heterogeneity ◽  
Terrestrial Mollusk ◽  
The North ◽  
Large Size ◽  
Different Types ◽  
Ulyanovsk Region ◽  
North Western ◽  
Mollusk Shell

The variability of conchiological characters of the shell of the terrestrial mollusk Chondrula tridens (Müller 1774) from 4 different types of landscapes of the Ulyanovsk region was studied. Analysis of elementary characters, proportions and wellhead armament of shell structures demonstrates a significant heterogeneity of the species. The large size of the shell of the snails is explained by an increase in the growth period due to an increase in temperature and humidity in the conditions of the north-western and southern landscapes of the Ulyanovsk region, as well as in the urbanized environment. Reducing the height of the shell, increasing roundness and better development of the mouth teeth of mollusks living in the chalk steppe reflects their adaptability to the conditions of more xerothermic landscapes, and also determines the position of the shell in space.

scholarly journals Distribution patterns of polyphenols and alkaloids in instant coffee, soft and energy drinks, and tea

2013 ◽  
Vol 31 (No. 5) ◽  
pp. 483-500 ◽  
Author(s):  
N. Manchón ◽  
L. Mateo-Vivaracho ◽  
D. Arrigo M ◽  
A. García-Lafuente ◽  
E. Guillamón ◽  
...  
Keyword(s):  
Black Tea ◽  
Distribution Patterns ◽  
Energy Drinks ◽  
Soft Drinks ◽  
Instant Coffee ◽  
Different Types ◽  
Low Levels ◽  
Using Data ◽  
Phytochemical Profiles

A previously developed method of HPLC-DAD-Fl has been used for the determination of phytochemical profiles in different types of drinks: instant coffee, soft drinks, energy drinks, and different types of tea (green, white, black, and red tea). Using data on the concentrations of 20 main phytochemicals (phenolic acids, flavan-3-ols, flavonols, flavones, and alkaloids) it was possible to identify most of the sample types. Chlorogenic and caffeic acids, and caffeine are the main target compounds in instant coffee; in soft and energy drinks, only caffeine was found. Tea has a more complex phytochemical composition. Unfermented tea is mainly composed of flavan-3-ols and alkaloids, with a high caffeine concentration. Black tea is composed of alkaloids and low levels of flavan-3-ols, which are affected by oxidative reactions during the fermentation. Flavonols are present in lower concentrations in all kinds of teas. The identified phytochemical distribution patterns were used to correctly differentiate instant coffee, soft drinks, energy drinks, unfermented tea and fermented tea (within fermented tea, black tea from red tea can also be differentiated).

Soil changes in forest ecosystems: evidence for and probable causes

1990 ◽  
Vol 97 ◽  
pp. 81-116 ◽  
Author(s):  
Dale W. Johnson ◽  
Malcolm S. Cresser ◽  
S. Ingvar Nilsson ◽  
John Turner ◽  
Bernhard Ulrich ◽  
...  
Keyword(s):  
North America ◽  
Soil Acidification ◽  
Forest Ecosystems ◽  
Acidic Deposition ◽  
Acid Soils ◽  
Western North America ◽  
Managed Forests ◽  
The North ◽  
North Western ◽  
Soil Changes

SynopsisA review of the literature on forest soil change in North America, Central Europe. Sweden, U.K., and Australia reveals that changes are occurring in both polluted and unpolluted sites at a greater rate than previously suspected. Acid deposition has played a major role in recent acidification in some areas of Europe and, to a more limited extent, in Sweden and eastern North America. However, rapid rates of soil acidification are occurring in western North America and Australia due to internal processes such as tree uptake and nitrification associated with excessive nitrogen fixation. The presence of extremely acid soils is not necessarily an indicator of significant acidic deposition, as evidenced by their presence in unpolluted, even pristine forests of the north-western U.S.A. and Alaska. Numerous studies in Sweden, Australia, and North America show the important effects of tree uptake and harvesting upon soil acidification in managed forests. Furthermore, arguments can be presented that harvesting takes a greater toll upon the pools of potentially limiting cations than leaching.The rate at which soils are changing in some instances calls for a re-evaluation of the budget analyses used to predict soil change. Specifically, inter-horizon changes due to uptake and recycling by vegetation, the interactions of such changes with naturally- and anthropogenically-produced acids, and the effects of aluminium uptake and recycling need further evaluation and study.

scholarly journals Microscopic algae of some lakes of the North-Western Black Sea coast (Ukraine)

Algologia ◽  
2020 ◽  
Vol 30 (4) ◽  
pp. 382-392
Author(s):  
V.P. Gerasimiuk ◽  
Keyword(s):  
New Species ◽  
Black Sea ◽  
New Record ◽  
Freshwater Species ◽  
The North ◽  
Black Sea Coast ◽  
Solid Substrates ◽  
Different Types ◽  
North Western ◽  
Sea Coast

Paper summarizes information on the diversity of microscopic algae of 10 lakes of the north-western Black Sea coast (Bile, Kahul, Kartal, Katlabukh, Kytai, Pysarske, Sasyk, Safyany and Yalpug). A total of 339 species belonging to 135 genera, 62 families, 30 orders, 10 classes, 7 divisions were identified. The richest divisions were Bacillariophyta (198) and Chlorophyta (62) and Cyanophyta (40). Representatives of Euglenophyta (18), Charophyta (15), Ochrophyta (5) and Dinophyta (1) were less diverse. In the studied lakes, 13 new species were found for the Danube lakes and four species are first cited for the water bodies of the North-Western Black Sea Coast and the territory of Ukraine. Among them Pinnularia fonticola Hustedt is new record to Europe. Genera Nitzschia Hassall (26), Navicula Bory (15), Сymbella C.Agardh (9), Tryblionella W.Sm. (9), Desmodesmus (F.Chodat) An, Friedl et E.Hegew.(9), Caloneis Cleve (8), Gomphonema (C.Agardh) Ehrenb. (8), Euglena Ehrenb. (7), Cosmarium Corda et Ralfs (7) and Oscillatoria Vaucher ex Gomont (7) formed the basis of the species composition of algae in studied lakes. Morphologically, 189 species are unicellular, 119 colonial and 31 multicellular algae. Of these, 157 species are known as motile and 182 as immotile forms. On different types of substrates different numbers of microalgae species were identified. 148 species grew epiphytically on macrophytes; on solid substrates, 42 species were revealed on concrete and 38 on stones. On the bottom, 110 species were found on silt and 41 on sand. In relation to the level of water mineralization in the lakes freshwater species dominated (281). They include 221 species of indifferents, 58 halophiles and 2 halophobes. Mesohalobes were represented by 52 species, six species are marine (polyhalobes). Lakes Yalpug (198 species), Kugurluy (198) and Katlabukh (192) were the richest in microalgae species.

North American Tychius: New synonymy and observations on phylogeny and zoogeography (Coleoptera: Curculionidae)

1977 ◽  
Vol 8 (4) ◽  
pp. 287-300 ◽  
Author(s):  
Wayne E. Clark
Keyword(s):  
North America ◽  
Host Range ◽  
North American ◽  
Distribution Patterns ◽  
Old World ◽  
The North ◽  
Native North American ◽  
Group Members ◽  
Close Relatives ◽  
New Synonymy

AbstractTychius mixtus Hatch is newly synonymized with T. tectus LeConte; T. lamellosus Casey, T. squamosus Hatch and T. intermixtus Hatch are synonymized with T. semisquamoslls LeConte, and T. hirsutus Clark is synonymized with T. soltaui Casey. New locality and host records are given for T. tectus LeConte, T. semisquamosus LeConte, T. sordidus LeConte, T. soltaui Casey, and T. liljebladi Blatchley. Comparison of North American Tyehius with species from Eurasia and Africa indicates that the North American species belong to at least 2 major groups, each of which has a greater number of species in the Old World. Phylogenetic and host plant relationships and distribution patterns indicate that Tyehius arose in the Old World; several independent dispersals from Eurasia have formed the North American fauna. Tyehius sordidus and T. caesius Clark are probably remnants of an old Holarctic fauna associated with the Arcto-Tertiary flora. Tyehius lineellus is probably related to the latter two species but dispersed via Beringia. T. liljebladi Blatchley and T. tectus LeConte are more closely allied to members of the semisquamosus Group; all of these have close relatives in Eurasia. The former 2 have as hosts species of Oxytropis and species of Astragalus which belong to Eurasian groups. They probably arrived in North America after the semisquamoslls Group was already established. T. tectus also has Astragalus hosts which belong to native North American groups. It appears to be extending its geographic and host range at the expense of some semisquamosus Group members. Members of the latter group are known only from species of Astragalus in American groups of from the genus Lotus.

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