scholarly journals ANALYSIS OF THE STATE OF THE NURA RIVER FORAGE BASE

2021 ◽  
Vol 6 (4(37)) ◽  
pp. 3-10
Author(s):  
V.N. Krainyuk ◽  
Zh. Kurzhikaev ◽  
A.S. Assylbekova ◽  
G.K. Barinova
Keyword(s):  
Total Mass ◽  
Dominant Species ◽  
The State ◽  
Frequency Of Occurrence ◽  
Bivalve Mollusks ◽  
Widespread Species ◽  
Commercial Fish ◽  
Forage Base ◽  
Total Species ◽  
Very High

This article presents the results of research on the state of the Nura River forage base. The species composition, total mass, and abundance of zooplankton and zoobenthos were determined in the reservoirs. The zooplankton of the studied reservoirs is also diverse and includes widespread species that can be divided into 3 groups: rotifers, branched-moustached, oar-footed crustaceans. In the studied reservoirs, 40 taxa were noted as part of zooplankton, of which 11 species are rotifers, 16 are branched crustaceans, and 13 are oar-footed crustaceans. A.priodonta, P.remata and F.longiseta are dominant in the frequency of occurrence in rotifers, D.сuclata and D.galeata in branchiformes, and representatives of the genus Mesocyclops in copepods. The total species diversity of the benthic complex of the Nura River contains more than 100 species. The abundance of small bivalve mollusks of the families Euglessidae and Pisidiidae, which form the basis of benthic biomass, is very high in the rheotic areas. The bottom population of limnic and areas close to them in terms of characteristics is more diverse in species terms. The dominant species here are the chironomids Chironomidae spp., which had a high number. The forage base of the river sections corresponds to the environmental conditions and allows a certain herd of commercial fish to exist.

scholarly journals Land Use and Land Cover Change Assessment in the Context of Flood Hazard in Lagos State, Nigeria

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1105
Author(s):  
Dorcas Idowu ◽  
Wendy Zhou
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Flood Hazard ◽  
The State ◽  
Land Cover Type ◽  
Lulc Change ◽  
Cover Type ◽  
Lulc Changes ◽  
Lagos State ◽  
Very High

Incessant flooding is a major hazard in Lagos State, Nigeria, occurring concurrently with increased urbanization and urban expansion rate. Consequently, there is a need for an assessment of Land Use and Land Cover (LULC) changes over time in the context of flood hazard mapping to evaluate the possible causes of flood increment in the State. Four major land cover types (water, wetland, vegetation, and developed) were mapped and analyzed over 35 years in the study area. We introduced a map-matrix-based, post-classification LULC change detection method to estimate multi-year land cover changes between 1986 and 2000, 2000 and 2016, 2016 and 2020, and 1986 and 2020. Seven criteria were identified as potential causative factors responsible for the increasing flood hazards in the study area. Their weights were estimated using a combined (hybrid) Analytical Hierarchy Process (AHP) and Shannon Entropy weighting method. The resulting flood hazard categories were very high, high, moderate, low, and very low hazard levels. Analysis of the LULC change in the context of flood hazard suggests that most changes in LULC result in the conversion of wetland areas into developed areas and unplanned development in very high to moderate flood hazard zones. There was a 69% decrease in wetland and 94% increase in the developed area during the 35 years. While wetland was a primary land cover type in 1986, it became the least land cover type in 2020. These LULC changes could be responsible for the rise in flooding in the State.

scholarly journals Composition and diversity of anurans in the Restinga of the Conde municipality, northern coast of the state of Bahia, northeastern Brazil

2016 ◽  
Vol 16 (3) ◽  
Author(s):  
Felipe Augusto Trindade Gondim-Silva ◽  
Alessandra Rodrigues Santos Andrade ◽  
Rafael Oliveira Abreu ◽  
Jamile Santos Nascimento ◽  
Geovane Paixão Corrêa ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Species Composition ◽  
Rainy Season ◽  
Dominant Species ◽  
The State ◽  
Northeastern Brazil ◽  
Freshwater Wetland ◽  
Northern Coast ◽  
Anuran Species

Abstract The Conde municipality is located in the northern coast of the state of Bahia (NC), northeastern Brazil, and is part of the Atlantic Tropical domain. The anuran fauna of the northern portion of the NC is still poorly known if compared to the southern portion. The Restinga is one of the predominant environments of the coastal plains of the NC and it is characterized essentially by presenting sandy soil covered by herbaceous and shrubby vegetation. The objective of this study was to determine the anuran species composition and diversity for the Restinga of the Conde municipality. Sampling was carried out at night by active search over four periods of five consecutive days each, two over the 'main rainy season' and two in a 'lesser rainy season', using 14 sample units (SUs) and five extra sample plots (EPs). We calculated dominance and species diversity using the Berger-Parker and Shannon-Wiener H' indices, respectively. We used accumulation curves and the Jackknife 1 estimator to estimate anuran species richness, considering only the data obtained from the SUs. We recorded 713 anuran specimens distributed within 33 species, 13 genera and five families (Bufonidae, Craugastoridae, Hylidae, Leptodactylidae and Microhylidae). The Hylidae and Leptodactylidae families had the highest species richness. Considering only the SUs (Jackknife 1 estimator in brackets), we recorded 28 species in the study area (33.9 ± 2.3), 13 in Shrubby Vegetation Zones - SVZ (20.8 ± 2.9) and 25 in Freshwater Wetland Zones - FWZ (28.9 ± 1.9). The abundance and species diversity of the FWZ (n = 638 specimens; H'= 2.4) were higher than those recorded for the SVZ (n = 52 specimens; H' = 1.9). The SVZ and FWZ showed distinct dominant species, wherein Pristimantis paulodutrai was the dominant species in SVZ and Scinax fuscomarginatus in FWZ. The Restinga of the Conde municipality stands out as the one with the highest anuran species richness already recorded considering only SVZ and FWZ. Moreover, its anuran species composition represented 55% of the anuran species known for the NC and included taxa common to three different morphoclimatic domains (Tropical Atlantic, Cerrado and Caatinga).

scholarly journals Experimental infection with Schistosoma mansoni of Biomphalaria straminea from different parts of the Northeast of Brazil

1986 ◽  
Vol 28 (3) ◽  
pp. 160-165 ◽  
Author(s):  
E. A. Malek ◽  
M. Z. Rouquayrol
Keyword(s):  
Schistosoma Mansoni ◽  
Puerto Rican ◽  
Experimental Infection ◽  
Snail Host ◽  
The State ◽  
Infection Rates ◽  
Biomphalaria Straminea ◽  
Albino Strain ◽  
Very High ◽  
Different Parts

In the western part of the State of Bahia Biomphalaria straminea and B. glabrata both occur, but in the majority of cases they do not share the same habitat. In the State of Ceará, however, B. straminea is the sole snail host of Schistosoma mansoni. In this survey, no naturally infected B. straminea was found among snails collected from Bahia and Ceará, evidently because of the very low infection rates. The susceptibility of laboratory-reared specimens to infection with a Puerto Rican strain of S. mansoni was then tested experimentally. In general, the snails showed very low susceptibility. The infection rates were 1.1% among snails from Redenção (Ceará); 2.3% in those from Pentecoste (Ceará); 2.9% in snails from São Desidério (Bahia), while they were very high among an albino strain (NIH) of B. glabrata used as control. Another group of B. straminea from São Desidério was exposed to a Bahian strain of S. mansoni and the infection rate was still very low (3.6%) Apparently, the very low susceptibility of B. straminea, despite high snail density, is correlated with moderate infection rates with S. mansoni among humans, as shown by the results of stool examinations conducted by SUCAM in the municipalities of Redenção and Pentecoste, in Ceará.

Film Condensation of Liquid Metals

1972 ◽  
Vol 1 (1) ◽  
pp. 5-12 ◽  
Author(s):  
W. M. Rohsenow
Keyword(s):  
Liquid Metals ◽  
Measurement Precision ◽  
The State ◽  
Film Condensation ◽  
Condensation Coefficient ◽  
Test Systems ◽  
Metal Vapors ◽  
Very High

A survey of the state of data for condensation of metal vapors is presented and includes a discussion of the influence of measurement precision and traces of non-condensable gas on the observed results. A careful review of data suggests that the condensation coefficient σ is very high, near 1.0, in the absence of non-condensable gas and that most condensation test systems are plagued to a greater or lesser degree by the presence of traces of non-condensable gas.

scholarly journals Efecto de la época y tipo de limpia en el frijol (Phaseolus vulgaris L.) de humedad residual.

2016 ◽  
Vol 8 (1) ◽  
pp. 59
Author(s):  
Valentín A. Esqueda ◽  
Arturo Durán ◽  
Ernesto López
Keyword(s):  
Phaseolus Vulgaris ◽  
Grain Yield ◽  
Central Area ◽  
The State ◽  
Phaseolus Vulgaris L ◽  
Residual Moisture ◽  
Grain Yields ◽  
Weed Density ◽  
Hand Weeding ◽  
Very High

Three experiments were carried out in the central area of the state of Veracruz, Mexico, during the Fall-Winter seasons of 1989-90, 1991-92 and 1992-93. The main objective was to determine the effect of the time and type of weeding on the yield of residual moisture growing beans. Twelve treatments, arranged in a CRBD with four replications were evaluated. Treatments consisted in hoeing at different times. In some treatments, hoeing was complemented with hand-weeding. The highest grain yields were obtained when the weeds were eliminated at least in two ocations during the early stages of development of the crop. The yield of these treatments was significantly higher than that obtained with the traditional weeding practice (hoeing at 25 days after emergence).Handweeding after hoeing increased grain yields at high weed densities,but when the weed density was not very high, handweeding after hoeing made no difference. The increase in grain yield obtained when two weeding operations were performed instead of one, was sufficient to cover for the expenses of this additional practice and to generate economic profits.

scholarly journals Describing the Mountainsnails (Oreohelix Sp.) of Grand Teton National Park, Wyoming

2013 ◽  
Vol 36 ◽  
pp. 94-97
Author(s):  
Lusha Tronstad ◽  
Gary Beauvais ◽  
Jeanne Serb ◽  
Kevin Roe
Keyword(s):  
National Park ◽  
National Park Service ◽  
Endangered Species Act ◽  
The State ◽  
Recent Past ◽  
Grand Teton National Park ◽  
Important Group ◽  
Park Service ◽  
Very High ◽  
The U.S

Invertebrates are receiving an increasing amount of conservation attention across North America. Currently, about 40% of the animals listed under the U.S. Endangered Species Act (ESA) are invertebrates (www.NatureServe.org). The National Park Service and other agencies require better information on invertebrate faunas in order to effectively conserve this important group of animals. One way to prioritize invertebrate groups for study is to assess the number of rare taxa within a given genus. In this context, Oreohelix (mountainsnails) are a top priority because the genus is assumed to support a very high percentage of rare and endemic taxa. Additionally, Oreohelix species in Wyoming and surrounding states have been petitioned for ESA listing in the recent past. The diversity of Oreohelix forms in Wyoming is not well-understood, and the current taxonomy may not reflect the true pattern of diversity within the state. Therefore, we are studying both the morphology and genetic structure of Oreohelix in Grand Teton National Park to begin to understand the diversity of mountainsnails in the state. We collected Oreohelix from 4 locations in Grand Teton National Park. Based on shell and internal characteristics, all individuals were identified as O. subrudis. We are currently preparing specimens for DNA sequencing.

scholarly journals Prospects of development of aquaculture in Russia and its regions

2019 ◽  
Vol 81 ◽  
pp. 01008
Author(s):  
Lyudmila Kalinina ◽  
Inga Zelenskaya ◽  
Sofya Trufanova ◽  
Nicolay Kalinin
Keyword(s):  
Agricultural Production ◽  
Fish Farming ◽  
The State ◽  
State Support ◽  
Commercial Fish ◽  
State Program ◽  
Irkutsk Region ◽  
Its Regions ◽  
Current Program ◽  
The Russian Federation

The state program “Development of aquaculture (commercial fish farming) in the Russian Federation for 2015-2020” (hereinafter referred to as the State Program) determines the main directions for the development of the fisheries complex and its financial support. However, the current program does not sufficiently elaborate the forms of state support for this sphere of agricultural production, which would contribute to the accelerated development of the industry. It should also be noted that the existing potential of aquaculture in Russia is not fully utilized. The Institute of Economics of the Irkutsk State Agrarian University named after A.A. Ezhevsky, in collaboration with the Ministry of Agriculture of the Irkutsk Region, assessed the fulfillment of tasks of the State Program, identified factors hindering the development of aquaculture in Russia and its regions, and developed recommendations for improving the forms of state support for economic entities in the industry.

scholarly journals An Analysis of Smart Contracts Security Threats Alongside Existing Solutions

Entropy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 203
Author(s):  
Antonio López Vivar ◽  
Alberto Turégano Castedo ◽  
Ana Lucila Sandoval Orozco ◽  
Luis Javier García Villalba
Keyword(s):  
Economic Impact ◽  
State Of The Art ◽  
Public Domain ◽  
Third Parties ◽  
The State ◽  
Security Threats ◽  
Smart Contracts ◽  
Holistic View ◽  
Security Challenges ◽  
Very High

Smart contracts have gained a lot of popularity in recent times as they are a very powerful tool for the development of decentralised and automatic applications in many fields without the need for intermediaries or trusted third parties. However, due to the decentralised nature of the blockchain on which they are based, a series of challenges have emerged related to vulnerabilities in their programming that, given their particularities, could have (and have already had) a very high economic impact. This article provides a holistic view of security challenges associated with smart contracts, as well as the state of the art of available public domain tools.

Partitioning of Food and Niche Characteristics of Coexisting Accipiter During Breeding

The Auk ◽  
1984 ◽  
Vol 101 (4) ◽  
pp. 761-779 ◽  
Author(s):  
Richard T. Reynolds ◽  
E. Charles Meslow
Keyword(s):  
Prey Size ◽  
The State ◽  
Total Density ◽  
Frequency Of Occurrence ◽  
Number Of Species ◽  
Accipiter Striatus ◽  
Shrub Canopy ◽  
Northern Goshawks ◽  
Nesting Season ◽  
Cooper's Hawks

AbstractThe abundance of resources and their use by Accipiter in two areas within Oregon from 1969 through 1974 are presented. In the coastal mountains of northwestern Oregon only Sharp-shinned Hawks (Accipiter striatus) and Cooper's Hawks (A. cooperii) nested. In the remainder of the state, A. striatus, A. cooperii, and Northern Goshawks (A. gentilis) were syntopic during the nesting season. The number of species and the total density of birds in eastern Oregon were about one-half those in northwestern Oregon. Mean prey size of A. striatus in northwestern Oregon (12.8 g) was significantly smaller than that of the same species in eastern Oregon (28.4 g). Accipiter striatus diets in both areas were composed almost entirely of birds (<5% mammals). Mean prey size of A. cooperii in both areas was nearly the same (134.7 g vs. 136.3 g) and was significantly larger than mean prey size of A. striatus. The frequency of occurrence and the size of prey taxa in A. cooperii diets, however, varied between areas: 74% birds (x̄ = 79.2 g) and 25% mammals (x̄ = 296.4 g) in northwestern Oregon versus 47% birds (x̄ = 123.7 g) and 53% mammals (x̄ = 147.5 g) in eastern Oregon. Mean prey size of A. gentilis in eastern Oregon (306.6 g) was significantly larger than that of A. cooperii and consisted of 55% birds (x̄ = 195.5 g) and 45% mammals (x̄ = 445.2 g). An analysis of prey sizes, prey taxa, and foraging heights indicated that, in general, food was partitioned in both areas primarily according to prey size. In eastern Oregon, however, where A. cooperii and A. gentilis overlapped broadly in prey size, these species tended to take different prey taxa. Both A. cooperii and A. gentilis foraged primarily in the lower zones (ground-shrub and shrub-canopy), whereas A. striatus foraged in the upper canopy.

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