SPECIES DIVERSITY OF CYANOBACTERIA AND ALGAE IN THE BUREYA RIVER BASIN (KHABAROVSK TERRITORY)

2019 ◽  
Vol 8 ◽  
pp. 91-113
Author(s):  
L.A. Medvedeva ◽  
◽  
T.V. Nikulina ◽  
Keyword(s):  
Species Diversity ◽  
River Basin ◽  
Cyanobacteria And Algae

scholarly journals Vegetation Dynamic Assessment by NDVI and Field Observations for Sustainability of China’s Wulagai River Basin

2021 ◽  
Vol 18 (5) ◽  
pp. 2528
Author(s):  
Panpan Chen ◽  
Huamin Liu ◽  
Zongming Wang ◽  
Dehua Mao ◽  
Cunzhu Liang ◽  
...  
Keyword(s):  
Species Diversity ◽  
River Basin ◽  
Vegetation Change ◽  
Vegetation Index ◽  
Dynamic Assessment ◽  
Indicator System ◽  
Vegetation Changes ◽  
Vegetation Dynamic ◽  
Management Policies ◽  
The Impact

Accurate monitoring of grassland vegetation dynamics is essential for ecosystem restoration and the implementation of integrated management policies. A lack of information on vegetation changes in the Wulagai River Basin restricts regional development. Therefore, in this study, we integrated remote sensing, meteorological, and field plant community survey data in order to characterize vegetation and ecosystem changes from 1997 to 2018. The residual trend (RESTREND) method was utilized to detect vegetation changes caused by human factors, as well as to evaluate the impact of the management of pastures. Our results reveal that the normalized difference vegetation index (NDVI) of each examined ecosystem type showed an increasing trend, in which anthropogenic impact was the primary driving force of vegetation change. Our field survey confirmed that the meadow steppe ecosystem increased in species diversity and aboveground biomass; however, the typical steppe and riparian wet meadow ecosystems experienced species diversity and biomass degradation, therefore suggesting that an increase in NDVI may not directly reflect ecosystem improvement. Selecting an optimal indicator or indicator system is necessary in order to formulate reasonable grassland management policies for increasing the sustainability of grassland ecosystems.

Origin of species diversity in the catfish genus Hypostomus (Siluriformes: Loricariidae) inhabiting the Paraná river basin, with the description of a new species

Zootaxa ◽  
2012 ◽  
Vol 3453 (1) ◽  
pp. 69 ◽  
Author(s):  
YAMILA P. CARDOSO ◽  
ADRIANA ALMIRÓN ◽  
JORGE CASCIOTTA ◽  
DANILO AICHINO ◽  
MARTA S. LIZARRALDE ◽  
...  
Keyword(s):  
New Species ◽  
Species Diversity ◽  
River Basin ◽  
Mitochondrial Control Region ◽  
Paraná River ◽  
Sea Level Changes ◽  
Parana River ◽  
D Loop ◽  
A New Species ◽  
Paraná River Basin

Within the Loricariidae, the genus Hypostomus is one of the most diversified freshwater catfish groups. Using new se-quence data from the mitochondrial Control Region (D-loop) we examined the phylogeny of this genus. Our phylogeneticanalyses suggest that, in the Paraná river basin, species diversity in the genus Hypostomus has been shaped by two proc-esses: 1) by inter-basin diversification, generating groups of species that inhabit different basins, as a result of dispersalevents; and 2) via intra-basin speciation as a result of basin fragmentation due to past marine transgressions, which pro-duced groups of species within a basin. Using the D-loop as a molecular clock, each event of diversification was datedand linked with documented hydrological events or sea level changes. We also assessed the possible dispersal routes be-tween the Paraná and Uruguay rivers, in addition to the obvious dispersal route via the Río de la Plata estuary. Finally, wedescribe a new species of Hypostomus inhabiting Middle Paraná river, Hypostomus arecuta n. sp. This species can be sep-arated from all other Hypostomus by having light roundish dots on a darker background and by number of premaxillary/ dentary teeth.

Relationships among plant species diversity, biomass, and the groundwater table in the Hailiutu River basin

2017 ◽  
Vol 37 (6) ◽  
Author(s):  
朱丽 ZHU Li ◽  
徐贵青 XU Guiqing ◽  
李彦 LI Yan ◽  
唐立松 TANG Lisong ◽  
牛子儒 NIU Ziru
Keyword(s):  
Species Diversity ◽  
River Basin ◽  
Plant Species ◽  
Groundwater Table ◽  
Plant Species Diversity

scholarly journals Odonata diversity of the middle and lower reaches of the Red River basin, Yunnan, China

2013 ◽  
Vol 1 (9) ◽  
pp. 1
Author(s):  
Jin Chen ◽  
Xin Yu
Keyword(s):  
Species Diversity ◽  
Biodiversity Conservation ◽  
River Basin ◽  
Yunnan Province ◽  
Red River ◽  
Red River Basin ◽  
Forest Streams ◽  
First Time

Eighty six species of Odonata are recorded from the middle and lower reaches of the Red River basin. Archineura hetaerinoides is recorded from China for the first time. Five genera and five species are new to Yunnan Province. Among the six types of odonate habitats, forest streams have the highest species diversity whereas ponds have the most species shared with other habitats. Both of these two habitats are important in biodiversity conservation and need urgent protection.

Impact factor analysis of aquatic species diversity in the Huai River Basin, China

2019 ◽  
Vol 19 (7) ◽  
pp. 2061-2071
Author(s):  
Hao Chen ◽  
Qi-ting Zuo ◽  
Yong-yong Zhang
Keyword(s):  
Species Diversity ◽  
River Basin ◽  
Environmental Indicators ◽  
Analysis Method ◽  
Factors Affecting ◽  
Physicochemical Variables ◽  
Huai River Basin ◽  
Huai River ◽  
Main Factors ◽  
The Huai River Basin

Abstract Water pollution has been a significant issue in the Huai River Basin (HRB) of China since the late 1970s. From December 2012, five experiments were carried out along the main streams of the HRB. The monitoring indices contained physicochemical variables, habitat environmental indicators and the community structure of phytoplankton, zooplankton and zoobenthos. The correlations between species diversity and physicochemical variables were analyzed using cluster analysis, correlation analysis method and redundancy analysis method. Results indicated that the species diversities of the Shaying River's upstream and Huai River's mainstream were better than the Shaying River's midstream and downstream. All the sections were divided into five clusters, and different clusters were affected by different physicochemical factors. Dissolved oxygen (DO), habitat quality index (HQI) and chemical oxygen demand (CODCr) were the main factors affecting the species diversity of the Shaying River's upstream; total phosphorus (TP), total nitrogen (TN), ammonia nitrogen (NH4-N), CODCr and permanganate index (CODMn) had a great influence on the Shaying River's midstream and downstream; DO, water temperature (WT), HQI and CODCr were the main factors affecting the Huai River's mainstream. These results provide valuable information for policy decision makers and stakeholders on water quality assessment, water ecosystem restoration, and sustainable watershed management in the HRB.

Soil algae of the Northeastern European Russia

2018 ◽  
Vol 52 (2) ◽  
pp. 311-353 ◽  
Author(s):  
E. N. Patova ◽  
I. V. Novakovskaya
Keyword(s):  
Species Diversity ◽  
River Basin ◽  
Original Data ◽  
European Russia ◽  
Soil Algae ◽  
Subpolar Urals ◽  
Mountain Tundra

The literature and original data on the species diversity of soil algae in the Northeastern European Russia are summarized. The table of 692 species belonging to 242 genera, six divisions with data on their distribution, known ecological and phytogeographical characteristics is presented. The most studied areas of this territory in soil algae are the Bolshezemelskaya tundra (Vorkuta tundra) where 251 species were identified, the Pechora lowland (Voseiskoye deposit) — 205 species, and the mountain tundra of the Subpolar Urals (the Kozhym River Basin) — 206 species. Taxonomic and ecological-geographical analyses of the flora of soil algae of the Northeastern European Russia are provided.

Spatial-typological structure of blackflies communities (Diptera: Simuliidae) of the River Tisa basin within of the Ukrainian Carpathians

2019 ◽  
Vol 15 (2) ◽  
pp. 59-70
Author(s):  
A. M. Tepliuk ◽  
K. B. Sukhomlin
Keyword(s):  
Species Diversity ◽  
High Altitude ◽  
River Basin ◽  
Dominant Species ◽  
Common Species ◽  
High Mountain ◽  
Typological Structure ◽  
Subdominant Species

A total of 46 species of blackflies from 2 genera were recorded in the watercourses of the Tisa River basin within Ukrainian Carpathians. In qualitative terms, the genus Simulium Latreille, 1802 predominates, with 42 species in 5 subgenera: Nevermannia Enderlein, 1921 (9 species), Eusimulium Roubaud, 1906 (2 species), Wilhelmia Enderlein, 1921 (4 species), Obuchovia Rubtsov, 1947 (2 species) and Simulium Latreille, 1802 (25 species). The genus Prosimulium Roubaud, 1906 is represented with only 4 species. Moreover, 33 species develop in streams (the index of the species diversity of Simpson (Is) is 0,094), and 32 species (Is – 0,087) of Simuliidae develop in rivers. There are 19 common species for both types of watercourses (the index of similarity of Chekanovsky-Sorensen (I) is 0.37). Only 14 species of blackflies develop in streams, and only 13 species develop in rivers. Two dominant species (S. (s.str.) intermedium, S. (s.str.) trifasciatum) and 4 subdominant species (S. (s.str.) argyreatum, S. (s.str.) ornatum, S. (s.str.) reptans, S. (s.str.) variegatum) form the nucleus of the fauna Simuliidae of the Tisa River basin. The species diversity of blackflies reaches 33 species (Is – 0,075) at watercourses of the low mountain level (at altitudes up to 499 m), is has 38 species (Is – 0,067) at the middle mountain level (500–999 m) and only 24 species (Is – 0,021) at high mountain level (above 1000 m). Only 6 species (S. (Eusimulium) velutinum, S.(Obuchovia) brevifile, S. (s.str.) noelleri, S. (s.str.) rostratum, S. (s.str.) tuberosum and S. (s.str.) voilense) develop in the watercourses of the low mountain level, 5 blackfly species (S. (Nevermannia) codreanui, S. (Wilhelmia) pseudoequinum, S. (s.str.) argenteostriatum, S. (s.str.) paramorsitans and S. (s.str.) vulgare) develop in the watercourses of the middle mountain level and 2 species blackflies (S. (Nevermannia) crenobium and S. (Nevermannia) oligotuberculatum) develop in the watercourses of the high mountain level. There are 16 species of Simuliidae common for this high altitude belts, among them S. (Nevermannia) vernum, S. (s.str.) fontanum, S.(s.str.) intermedium, S.(s.str.) ornatum and S. (s.str.) trifasciatum did not reveal the definite patterns of belonging to the specific altitudes, since their quantity was approximately the same at different heights.

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