Distribution of aquatic vascular plants in lowland rivers: separating the effects of local environmental conditions, longitudinal connectivity and river basin isolation

2005 ◽  
Vol 50 (3) ◽  
pp. 418-437 ◽  
Author(s):  
BENOIT O. L. DEMARS ◽  
DAVID M. HARPER
Keyword(s):  
River Basin ◽  
Environmental Conditions ◽  
Vascular Plants ◽  
Lowland Rivers ◽  
Longitudinal Connectivity

Organochlorine Contaminants in Headwater Peatlands, and Selected Estuary Sites of the Moose River

1986 ◽  
Vol 21 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Robert C. McCrea ◽  
Greg M. Wickware
Keyword(s):  
Atmospheric Deposition ◽  
Organochlorine Pesticides ◽  
River Basin ◽  
Vascular Plants ◽  
Typha Latifolia ◽  
Coastal Marshes ◽  
Surficial Sediments ◽  
Organochlorine Contaminants ◽  
Hexachlorocyclohexane Isomers ◽  
Moose River

Abstract Peatland waters of the Moose River basin, as well as surficial sediments and vascular plants of the estuary were sampled in 1982. Elevated levels of PCBs were found at all five peatland sites; concentrations ranged from 28 to 65 ng/L. Of the seventeen organochlorine pesticides investigated, the hexachlorocyclohexane isomers (a-and y-BHC) were the most prominent with total BHC concentrations ranging from 1.5 to 13.7 ng/L. The presence of these contaminants in ombrotrophic bogs indicated that there was atmospheric deposition of organochlorine contaminants in the basin. Analyses of surficial sediments, collected from tidal flats and coastal marshes, showed that PCBs and organochlorine pesticides were not present. Samples of Triglochin maritima L. seed heads and Typha latifolia L. roots were also free of PCBs.

Analysis of fishways in the Middle and Lower Jinsha River Basin (China)

2021 ◽  
Author(s):  
Siqi Tong ◽  
Silke Wieprecht ◽  
Martin Schletterer
Keyword(s):  
River Basin ◽  
Jinsha River ◽  
Vertical Slot ◽  
Upper Yangtze River ◽  
Artificial Breeding ◽  
Longitudinal Connectivity ◽  
Target Fish ◽  
Regional Sustainable Development ◽  
Vertical Slot Fishway ◽  
Hydropower Stations

<p>This study was carried out in the middle and lower reaches of the Jinsha River in southwest China, which represents the upper Yangtze River. Hydraulic structures (14 cascade hydropower stations) are planned and/or constructed in this system, which is considered as largest hydropower base. We aim to summarize appropriate measures to restore the riverine continuum in the middle and lower reaches of the Jinsha River, where high-head cascade hydropower dams are located or planned.</p><p>We distributed a questionnaire to Chinese researchers in the related fields (scientists, hydropower operators and NGOs in China, n = 60). According to the responses, fishways, fish lift, fish lock, trap-and-truck system as well as fish hatcheries (artificial breeding) are recognized to ensure passing respectively preserving fish in the Jinsha River basin.</p><p>A longitudinal connectivity assessment of the study area revealed a severely disturbed continuity status. Based on the biological analyses of the demands of the target fish species and review of fish pass technologies, a vertical-slot fishway is proposed.</p><p>Considering the dam heights and the geographical conditions, it is recommended to combine the vertical-slot fishway with these alternatives to achieve a higher efficiency in passing fish as well as to recover the river continuity towards regional sustainable development.</p>

scholarly journals Floristic findings in the Maya River basin (Khabarovsk Territory)

Turczaninowia ◽  
2021 ◽  
Vol 24 (1) ◽  
pp. 37-43
Author(s):  
Maria I. Vernoslova
Keyword(s):  
River Basin ◽  
Russian Federation ◽  
Vascular Plants ◽  
Medicago Lupulina ◽  
New Locations ◽  
Gentiana Macrophylla ◽  
The Russian Federation ◽  
Bupleurum Scorzonerifolium ◽  
Saxifraga Cernua ◽  
Campanula Punctata

The article provides an information about floristic findings in the Maya Aldanskaya River basin. As a result of expeditionary researches, new locations of 25 species and 1 subspecies of vascular plants were revealed, including for the Aldan floristic region – 9 species: Bupleurum scorzonerifolium, Cardamine prorepens, C. macrophylla, Gentiana macrophylla, Linum komarovii, Medicago lupulina, Packera heterophylla, Triglochin maritima, Valeriana alternifolia; for the Maya River valley – 9 species and 1 subspecies: Campanula punctata, Iris laevigata, Leontopodium conglobatum, Linaria acutiloba, Lysimachia thyrsiflora, Micranthes staminosa, Polemonium boreale, Rhodiola rosea, Saxifraga cernua, Hypericum ascyron subsp. gebleri; in the Red Data Books of the Regions and the Russian Federation – 7 species: Aconogonon amgense, Alyssum obovatum, Anemone tamarae, Borodinia macrophylla, Ephedra monosperma, Hedysarum dasycarpum, Saxifraga lactea.

Mobilization of bacteriophages from soil matrix to soil water in the Attert River basin: A case study

2021 ◽  
Author(s):  
Perrine Florent ◽  
Henry-Michel Cauchie ◽  
Leslie Ogorzaly
Keyword(s):  
Soil Water ◽  
River Basin ◽  
Dna Sequences ◽  
Environmental Conditions ◽  
Viral Population ◽  
Soil Matrix ◽  
Shotgun Metagenomics ◽  
Water Compartment ◽  
Soil Temperatures ◽  
The 1960S

<p>Bacteriophages are numerous, tremendously diverse and ubiquitous in the environment. Since the 1960s, bacteriophages have been proposed as new tracers to investigate the hydrological processes in addition to conventional tracers (i.e. isotopes, salts, dyes). Their dynamic into water (i.e. surface water, groundwater) have been well studied. However, the soil compartment known for its important microbial activity, have been few characterized in terms of bacteriophage diversity. Hence, in the present study, the objective is to investigate the transport of soil viral population from the soil matrix to the soil water compartment. This mobilization from the soil matrix is mainly driven by the adsorption/desorption mechanisms to which bacteriophages are subjected. Therefore, in order to understand the dynamics of the bacteriophage population, both soil and soil water were sampled from the Weierbach forest, located in the Attert River basin (Grand-Duchy of Luxembourg) at the topsoil level (i.e. 0-20 cm) over a period of one month. Due to a lower abundance of the microbial population in soil water, an enrichment method was carried out to increase the concentration. Subsequently, a shotgun metagenomics analysis was performed on the soil and soil water samples to obtain the DNA sequences, which were then sorted using bioinformatics and statistical analyses, allowing ultimately the identification of the viral populations. The moving of the bacteriophage populations from the soil to the soil water provides information on their transport capacity, in particular by taking into account environmental conditions such as air and soil temperatures, precipitation, soil humidity, soil pH, etc.  </p><p> </p><p><strong>Key words</strong>: bacteriophages, soil, water, transport, environmental conditions</p>

The influence of simulated canopy light on the growth of six acrocarpous moss species

1979 ◽  
Vol 57 (11) ◽  
pp. 1236-1242 ◽  
Author(s):  
John Hoddinott ◽  
John Bain
Keyword(s):  
Opposite Direction ◽  
Natural Environment ◽  
Environmental Conditions ◽  
Vascular Plants ◽  
The Other ◽  
Growth Responses ◽  
Moss Species ◽  
Growth Chambers

Six moss species were grown in two growth chambers with similar environmental conditions except for their ç ratios (E660:E730). One chamber simulated a sunlit situation the other a subcanopy shade situation. Different growth responses were observed for several species in the two chambers, which were often in the opposite direction to observations made on vascular plants. The ç ratio may be an important factor in regulating the distribution of mosses in the natural environment.

scholarly journals Environmental conditions associated with occurrences of the threatened Yaqui Catfish in the Yaqui River basin, Mexico

2021 ◽  
Author(s):  
Thomas Hafen ◽  
Andrew T. Taylor ◽  
Dean A. Hendrickson ◽  
David R. Stewart ◽  
James M. Long
Keyword(s):  
River Basin ◽  
Environmental Conditions
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