Yan Liu

Harbin Normal University | HRBNU · Life and Science technology

Tibet is a very important biodiversity hot spot in China and the diatom flora of this region has drawn a lot of attention. Diatom samples were collected from several places across Tibet. During research on the biodiversity of diatoms from Tibet, one Achnanthidium species showed unique features compared with other known taxa. It has linear-lanceolat...

The upper Han River plays an important role in the Middle Route of the North to South Water Transfer Project in China. During an investigation of diatom biodiversity in this area, a new benthic monoraphid diatom, Achnanthidium ampliatum sp. nov. was observed from an alkaline tributary. This new species has relatively large valves, with a lanceolate...

A new species, Epithemia agharkarii sp. nov., is described from the Mula River, Western Ghats, India. The new species is described based on light and scanning electron microscopy; it is characterized by having lanceolate to slightly elliptical valves with rounded apices and being 16-38 μm long and 12.5-17.5 μm wide. Based on morphology, especially...

Biodiversity "hotspot" areas have been shown to possess unique diatom floras. During our diatom studies of some of these types of areas in China, samples were collected from Hainan and Guangdong Provinces, and four species from 4 different genera are proposed as new to science based on LM and SEM observations. These new taxa are Eunotia dinghunsis...

The relationship between biodiversity and ecological functioning is a central issue in freshwater ecology, but how this relationship is influenced by hydrological connectivity stress is still unknown. In this study we analyzed the dynamic of the phytoplankton alpha diversity indices and their relationships with trophic state in two hydrologically c...

a new Gomphonema species is described from the Shiwan Mts. in guangxi Zhuang autonomous region, Southwest China. this new species differs from other known members of the genus Gomphonema by its linear-lanceolate shape, wide axial area, slit-like areolae openings, one short spine at the headpole externally, and large pseudoseptum at each end interna...

In this paper we inventory the continental diatom taxa described from inland waters in China, from the first species descriptions dating back to 1848 through 2019. China's geography and hydrography are complex, including the world's highest mountains, many large rivers, salty lakes, and large karst regions. From this area, a total of 1128 taxa have...

Organophosphorus pesticides, one of the most extensively used organic chemicals to control several insect pests, making them threaten the aquatic creatures. Here, we analysed the response mechanism of Nitzschia palea to insecticides (acephate and trichlorfon) exposure, through physiological, biochemical, morphological changes and the removal abilit...

The Lalin River Basin (LLRB) is a major drainage basin in northeastern China, that has been significantly influenced by agricultural activities. This study focused on exploring diatom taxonomic composition linked to environmental factors at the taxonomic levels of genus and species during ice-covered periods. Nine sampling stations were divided int...

We present light and scanning electron microscope observations on a new species of the diatom genus Sellaphora, Sellaphora wangii Y.Liu & Kociolek, sp. nov., described from Hainan Island, China. This species has a raised conopeum with an axial groove or trough on either side of the axial area containing striae extending into the trough, and round d...

A new Neidium species was observed from a wet-wall in Shiwan Mountains National Forest Park, Guangxi Zhuang Autonomous Region, in the Southwest of China. This region of China has not had much previous attention focused on the biodiversity of freshwater algae. The new species, Neidium convolutum Y.Liu & Kociolek, is very distinctive compared with ot...

A new triundulate naviculoid diatom genus is described from the Western Ghats of Peninsular India and Hainan Province, China. The new taxon, Kulikovskiyia gen. nov. has robust conical spines along its margin and at the apices and the external valve face has longitudinally‐oriented siliceous slat system extending the length of the valve. The externa...

Background and aims-We examine the possibility of the independent evolution of the same features multiple times across the pennate diatom tree of life. Methods and key results-Features we have studied include symmetry, raphe number and amphoroid symmetry. Phylogenetic analysis, with both morphological and molecular data suggest in each of these cas...

During an investigation of the diatom biodiversity of Yunnan Province, one new Gomphonema species was observed from a plateau wetland / nature reserve area associated with Lashi Lake. The new species resembles members of the Gomphonema acuminatum complex, possessing a distinctive outline where the tumid center of the valve is as wide or wider than...

In recent years, there have been significant advances in the knowledge and understanding of the pollution attributed to effects of aquatic toxic metals on fresh water benthic diatoms. In this study, the cell growth, chlorophyll a content and superoxide dismutase activity in Halamphora veneta (Kützing) Levkov and Surirella crumena Brébisson exposed...

We describe Sinoperonia gen. nov. for freshwater diatoms from mountainous regions of south-central China and northern Vietnam, whose single species, S. polyraphiamorpha sp. nov., develops monoraphid, biraphid and araphid frustules in the general proportions of 4:2:1 (China) or 2:1:1 (Vietnam), respectively, in different populations. Light and scann...

This study investigates the effects of copper and mercury on growth rate, chlorophyll a content, superoxide dismutase (SOD) activity, SOD mRNA gene expression, and frustule morphology of the benthic freshwater diatom Halamphora veneta (Kützing) Levkov and the potential utility of each for toxicity assessment in aquatic habitats. Results showed the...

Urosolenia and Acanthoceras are reported as cosmopolitan centric genera, but records of these two taxa are infrequent. During an investigation of the diatom flora from Hainan Province, South of China, three Urosolenia and one Acanthoceras species were observed. Based on the morphological and ultrastructural features, we propose these three Urosolen...

Two new monoraphid diatoms, Psammothidium hainanii Kociolek & Liu sp. nov. and Platessa guagnzhouae Liu & Kociolek sp. nov., are described. Both species were collected from southern China, from Hainan and Guangzhou province, respectively. Psammothidium hainanii is distinguished from other species by its unique outline and rectangular central area o...

During an extensive survey of diatoms from Xingkai Lake, China, one unusual species of the genus Gomphonema was discovered. Detailed morphology of this species is presented using light (LM) and scanning electron microscopy (SEM). These specimens are described as new and named Gomphonema subinsigniforme sp. nov. It is distinguished from other known...

A new species, Neidium limuae Liu & Kociolek, is described from Limu Mountain, which is located in the middle part of the Hainan Province, China. The valves of this new species have a distinct linear outline with rostrate apices. The areolae forming the striae are externally covered by volate projections that show a reticulated design. These occlud...

Six new species of the diatom genus Gomphonema Ehrenberg are described from lakes, swamps, bogs and streams from the Great Xing'an Mountains region of Northeastern China. Descriptions are based on light and scanning electron microscope observations of valve shape, size and ultrastructure. Of the six new species, four are known from the Great Xing'a...

A morphological investigation of populations of Navicula occulta Krasske from Great Xing'an Mountains (northeastern China) was undertaken. Light and scanning electron microscopic observations clearly showed that although it shared some features with Fallacia Stickle & Mann, it differed from both typical Navicula Bory and Fallacia species by several...

A population of Meridion circulare var. circulare (Greville) C. A. Agardh from Inner Mongolia was found to produce Innenschalen or internal spores. Examination of this population with light and scanning electron microscopy showed morphological differentiation between vegetative and spore morphologies. Vegetative valves typically bear costae and one...

Located in the southwestern region of the Great Xing'an Mountains, Da'erbin lake is characterized by extensive acid bogs surrounding the lake. The taxonomy of its diatom flora is poorly documented, although diatoms are recognized as important indicators of the environment. From July 2004 to May 2006, the diatom flora of the Da'erbin Lake habitats a...

A new species of the genus Diatoma was discovered while studying the diatom flora of Great Xing'an Mountains, Northeast China. Diatoma rupestris sp. nov. is described based on both light and scanning electron microscopic observations. It is primarily distinguished from known Diatoma taxa by its narrow, linear outline, acutely rounded, slightly prot...

During an extensive survey of diatoms from the Great Xing'an Mountains, China, two unusual species of the genus Pinnularia Ehrenb. were discovered. Based on both light and scanning electron microscopic observations, both species are described as new: Pinnularia subaldenii sp. nov. and Pinnularia paludosa sp. nov. The morphology of both species is c...

Spanning a large latitudinal range (N34°25'-49°10'), the diatom flora of the Xinjiang Uygur Autonomous Region includes both cold and temperate diatom taxa, as well as some unique taxa adapted to alkaline or alpine conditions. We collected diatoms from 311 sites distributed in representative water bodies throughout Xinjiang, at altitudes between 450...

Synedra ulna var. repanda Q. X. Wang & Q. M. You, a new variety of Synedra (Bacillariophyta) from Xinjiang, China, is described and illustrated, and the characteristic of the variety: includes undulate-linear valves and straight pseudoraphe, differs from other species of Synedra. Keyword Synedra ulna var. repanda Q. X. Wang & Q. M. You-Fragilariac...