New stomatocysts discovered in Sphagnum peatlands, central China

Phytotaxa ◽  
2020 ◽  
Vol 477 (2) ◽  
pp. 151-170
Author(s):  
XUE BAI ◽  
JOLANTA PIĄTEK ◽  
KONRAD WOŁOWSKI ◽  
ZHAOJUN BU ◽  
XU CHEN
Keyword(s):  
Working Group ◽  
Central China ◽  
Mountainous Region ◽  
Conservation Priority ◽  
Subtropical Region ◽  
Comprehensive Investigation ◽  
Sem Micrographs ◽  
Arctic Regions ◽  
Chrysophyte Stomatocysts ◽  
Algal Distribution

Chrysophyte stomatocysts have been studied widely in temperate and arctic regions, while they are rarely investigated in tropical and subtropical areas. The subtropical mountainous region in central China is one of the Global 200 conservation priority ecoregions, due to its high biodiversity. There are some patches of pristine peatlands developed in lowlands of this region, while little knowledge is available on algal distribution in this high biodiversity region. Twenty-four stomatocysts were identified and described in this paper following International Statospore Working Group (ISWG) guidelines and illustrated by SEM micrographs, with eighteen previously described stomatocysts and six new stomatocysts. This is the first comprehensive investigation of stomatocysts in subtropical montane peatlands in central China, which can improve our knowledge on the richness and distribution of stomatocysts in the subtropical region.

Three new chrysophycean stomatocysts with long spines from the Gulf of Finland, Baltic Sea

Phytotaxa ◽  
2021 ◽  
Vol 528 (4) ◽  
pp. 255-260
Author(s):  
SVETLANA N. SHADRINA
Keyword(s):  
Baltic Sea ◽  
Working Group ◽  
Gulf Of Finland ◽  
Sem Micrographs ◽  
Biological Affinity ◽  
The Gulf Of Finland

Three new morphotypes of chrysophycean stomatocysts with long spines are described following International Statospore Working Group (ISWG) guidelines and illustrated by SEM micrographs. Differences of our new morphotypes from known stomatocysts are discussed. Their biological affinity is currently unknown.

Chrysophycean stomatocysts from freshwater habitats of the Strømness Bay area, South Georgia, Antarctica

2000 ◽  
Vol 78 (1) ◽  
pp. 88-97 ◽  
Author(s):  
Bart Van de Vijver ◽  
Louis Beyens
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Working Group ◽  
South Georgia ◽  
Chrysophyte Cysts ◽  
Bay Area ◽  
Freshwater Habitats ◽  
Chrysophyte Stomatocysts ◽  
Scanning Electron

The chrysophycean stomatocyst flora of freshwater samples from the Strømness Bay area, located in the northern part of the Sub-Antarctic Island of South Georgia, was investigated, using scanning electron microscopy. A total of 59 stomatocyst morphotypes were recorded. Thirty-one of them were previously observed and 28 are described as new, following guidelines of the International Statospore Working Group. Since this is only the second study of chrysophyte cysts from South Georgia, this large number of new morphotypes is not surprising. The cyst flora show only a small resemblance to the stomatocyst flora found on mosses of the same area.Key words: chrysophyte stomatocysts, South Georgia, Sub-Antarctica.

scholarly journals Forest dynamics and carbon storage under climate change in a subtropical mountainous region in central China

Ecosphere ◽  
2020 ◽  
Vol 11 (3) ◽  
Author(s):  
Yu Wu ◽  
Dongya Wang ◽  
Xiujuan Qiao ◽  
Mingxi Jiang ◽  
Qianxi Li ◽  
...  
Keyword(s):  
Climate Change ◽  
Carbon Storage ◽  
Forest Dynamics ◽  
Central China ◽  
Mountainous Region

scholarly journals Air Stagnations for China (1985–2014): Climatological Mean Features and Trends

2017 ◽  
Author(s):  
Qianqian Huang ◽  
Xuhui Cai ◽  
Yu Song ◽  
Tong Zhu
Keyword(s):  
Inner Mongolia ◽  
Eastern China ◽  
Central China ◽  
Positive Trend ◽  
Major City ◽  
Comprehensive Investigation ◽  
Shandong Peninsula ◽  
Wind Speeds ◽  
Meteorological Measurement ◽  
Inner Mongolia Plateau

Abstract. Air stagnation is an important meteorological measurement for unfavourable air pollution conditions, but little is known about it in China. We conducted a comprehensive investigation of air stagnation in China, based on sounding and surface observations of 81 stations, from January 1985 to December 2014. The stagnation criteria were revised to be topographically dependent for the great physical diversity in this country. It is found that the annual mean air stagnation occurrences are closely related to general topography and climate features. Two basins in the northwest and southwest of China—Tarim and Sichuan Basins—exhibit the most frequent stagnation occurrence (50 % days per year), whereas two plateaus (Tibet-Qinghai and Inner Mongolia Plateau) and the east coastal areas experience the least (20 % days per year). Over the whole country, air stagnations achieve maxima in summer and minima in winter, except for Urumqi, a major city in the northwest of China, where stagnations keep a rather constant value yearly around with a minimum in spring. There is a nationwide positive trend in stagnation occurrence during 1985–2014, with the strongest increasing centres over Shandong Peninsula in eastern China and the south of Shaanxi in central China. Dependence degrees of air stagnations on three components (upper- and lower-air winds, precipitation-free days) are examined. It shows that the spatial distribution and trend of air stagnations are mainly driven by the behaviours of upper-air wind speeds.

scholarly journals Chrysophycean stomatocysts from Morskie Oko and Żabie Oko lakes in the Tatra National Park, Poland

2011 ◽  
Vol 74 (4) ◽  
pp. 305-314 ◽  
Author(s):  
Jolanta Cabała
Keyword(s):  
Working Group ◽  
National Park ◽  
Sem Micrographs ◽  
Tatra National Park

Sixteen chrysophycean stomatocysts are reported from the lakes Morskie Oko and Żabie Oko in the Tatra National Park, Poland. Of these, six morphotypes are new to Poland, and two morphotypes plus one forma are new to science. These stomatocysts are illustrated with SEM micrographs and described according to International Statospore Working Group (ISWG) guidelines. The comparison of stomatocyst community between Morskie Oko and Żabie Oko lakes is given.

Four new chrysophycean stomatocysts with true complex collar from the Shichengskoe raised bog in Central Russia

Phytotaxa ◽  
2016 ◽  
Vol 288 (3) ◽  
pp. 285 ◽  
Author(s):  
DMITRY A. KAPUSTIN ◽  
DMITRIY A. PHILIPPOV ◽  
EVGENIY S. GUSEV
Keyword(s):  
Working Group ◽  
Raised Bog ◽  
Sem Micrographs ◽  
Central Russia ◽  
Biological Affinity

Four new morphotypes of chrysophycean stomatocysts with true complex collar are described following International Statospore Working Group (ISWG) guidelines and illustrated by SEM micrographs. Stomatocyst 1 is ornamented with long ridges while three other morphotypes are ornamented with spines. Differences of our new morphotypes from known stomatocysts are discussed. We suppose that our stomatocysts are produced by acidobiontic and oligotraphentic species but biological affinity of them are currently unknown.

2.2. Working Group 2: Conceptual Definitions of Reference Coordinate Systems for Earth Dynamics

1975 ◽  
Vol 26 ◽  
pp. 21-26
Keyword(s):  
Coordinate System ◽  
Working Group ◽  
General Character ◽  
Coordinate Systems ◽  
Reference Coordinate System ◽  
Group 2 ◽  
Definition Of ◽  
Earth Dynamics

An ideal definition of a reference coordinate system should meet the following general requirements:1. It should be as conceptually simple as possible, so its philosophy is well understood by the users.2. It should imply as few physical assumptions as possible. Wherever they are necessary, such assumptions should be of a very general character and, in particular, they should not be dependent upon astronomical and geophysical detailed theories.3. It should suggest a materialization that is dynamically stable and is accessible to observations with the required accuracy.

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

Hexachlorobenzene toxicity in the rat ovary: II. Ultrastructure induced by medium (10 mg/kg) dose exposure

1992 ◽  
Vol 50 (1) ◽  
pp. 668-669
Author(s):  
Amreek Singh ◽  
Warren G. Foster ◽  
Anna Dykeman ◽  
David C. Villeneuve
Keyword(s):  
Germ Cells ◽  
Primordial Germ Cells ◽  
Surface Epithelium ◽  
Morphological Parameters ◽  
Comprehensive Investigation ◽  
Ovary Surface Epithelium ◽  
Rat Ovary ◽  
High Doses

Hexachlorobenzene (HCB) is a known toxicant that is found in the environment as a by-product during manufacture of certain pesticides. This chlorinated chemical has been isolated from many tissues including ovary. When administered in high doses, HCB causes degeneration of primordial germ cells and ovary surface epithelium in sub-human primates. A purpose of this experiment was to determine a no-effect dose of the chemical on the rat ovary. The study is part of a comprehensive investigation on the effects of the compound on the biochemical, hematological, and morphological parameters in the monkey and rat.

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