LONG-TERM DYNAMICS OF THE SIZE-WEIGHT AND SEXUAL STRUCTURE IN POPULATIONS OF PELOBATES FUSCUS (ANURA, PELOBATIDAE) IN THE MEDVEDITSA RIVER VALLEY (SARATOV REGION)

In the course of our long-term studies of the phenology of spawning migrations of anuran amphibians, which began in the Medveditsa river valley (near the Uritskoye village, Lysogorsky district, Saratov region) in 2009, an abnormally early end of the wintering period was recorded for the red-bellied toad (Bombina bombina) in the spring of 2020, namely, March 13. The anomaly was longer than a month in relation to the long-term average date of arrival of this species to its spawning grounds (April 18). The water temperature in the shallow waters of the spawning reservoir on this day was 10.2°С to a depth of 0.1 m, and 4.8°С at a depth of 0.5 m, and did not differ significantly from the average values typical for this phase of the B. bombina annual cycle in adjacent populations. The possible significance of this anomaly for the reproduction of local populations of B. bombina is discussed.

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Morphometric studies of artemia males from different populations of the Altai region

Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries) ◽

10.33920/sel-09-2007-03 ◽

2020 ◽

pp. 28-38

Author(s):

L. Vesnina ◽

G. Lukerina ◽

T. Ronzhina ◽

A. Savos’kin ◽

D. Surkov

Keyword(s):

Sexual Dimorphism ◽

Hydrogen Index ◽

Morphometric Parameters ◽

Altai Region ◽

Sexual Structure ◽

Different Populations ◽

Artemia Population ◽

Term Data ◽

Brine Salinity

The long-term data from morphometric studies of Artemia males from bisexual and parthenogenetic populations from hyperhaline reservoirs of the Altai region (Bolshoe Yarovoe Lake, Maloe Shklo Lake, and the Tanatar Lakes system) is analyzed in this paper. The description of signs of sexual dimorphism and sexual structure in different populations is given. The influence of brine salinity and hydrogen index on morphometric parameters of males was analyzed. There are differences in the sexual structure of the Artemia population: in the lakes Maloe Shklo and the thanatar system, the populations are bisexual (the share of males is 28.5 — 75.0 %), in the lake Bolshoe yarovoe — parthenogenetic (the share of males on average does not exceed 3 %). At the same time, sexual dimorphism is typical for both types of populations: females are larger than males, males have a larger head (the distance between the eyes is greater by 15.5 %, the diameter of the eye is 26.1 %, the length of the antenna is 22.3 %) and a larger number of bristles (36.1 %). The greatest variability is observed in the parameters of the Furka structure associated with the salinity of water by feedback and the pH — line indicator. Significant differences between the samples of males were revealed. The largest number of significant differences in morphometric indicators was found between samples of males from bisexual populations (lake thanatar and lake Maloe Shklo), the smallest — between males from the parthenogenetic population of lake Bolshoe yarovoe and males from lake Maloe Shklo.

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Wind Power Potential over the World’s Deepest River Valley

Journal of Nepal Physical Society ◽

10.3126/jnphyssoc.v4i1.17337 ◽

2017 ◽

Vol 4 (1) ◽

pp. 54

Author(s):

Ram P. Regmi ◽

Sangeeta Maharjan

Keyword(s):

Wind Power ◽

River Valley ◽

Weather Research And Forecasting ◽

Valley Wind ◽

Wind Characteristic ◽

Wind Characteristics ◽

Long Term Observation ◽

Wrf Modeling ◽

Sustainable Power

Wind power potential prevailing over the world’s deepest river gorge, the Kali Gandaki River Valley, located in the western trans-Himalaya region of Nepal, has been assessed and mapped at 1 km × 1 km horizontal grid resolution with the application of Weather Research and Forecasting (WRF) modeling system. The wind power potential maps cover 70 km × 70 km area, which encloses the very first and failed wind power project in the country and the Jomsom Airport at the center. The simulated wind characteristics compare well with the available observed wind characteristic. The wind power potential appears to vary from good to outstanding over 200 km2 area along the axis of Kali Gandaki River Valley. However, a detail long-term observation, numerical simulation as well as engineering examinations are desired to address abnormal valley wind characteristics for sustainable power production over the area.Journal of Nepal Physical Society Volume 4, Issue 1, February 2017, Page : 54-59

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Long-term seasonal forecasting of a major migrant insect pest: the brown planthopper in the Lower Yangtze River Valley

Journal of Pest Science ◽

10.1007/s10340-018-1022-9 ◽

2018 ◽

Vol 92 (2) ◽

pp. 417-428 ◽

Cited By ~ 15

Author(s):

Gao Hu ◽

Ming-Hong Lu ◽

Don R. Reynolds ◽

Hai-Kou Wang ◽

Xiao Chen ◽

...

Keyword(s):

Yangtze River ◽

Insect Pest ◽

Brown Planthopper ◽

Yangtze River Valley ◽

River Valley ◽

Seasonal Forecasting ◽

Lower Yangtze

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Long term effects of climate on human adaptation in the middle Gila River Valley, Arizona, America

Water History ◽

10.1007/s12685-015-0145-7 ◽

2015 ◽

Vol 7 (4) ◽

pp. 511-531 ◽

Cited By ~ 2

Author(s):

Tianduowa Zhu ◽

M. W. Ertsen ◽

N. C. van der Giesen

Keyword(s):

River Valley ◽

Human Adaptation ◽

Long Term Effects ◽

Gila River

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Carbon Dioxide Emissions as Affected by Alternative Long-Term Irrigation and Tillage Management Practices in the Lower Mississippi River Valley

The Scientific World JOURNAL ◽

10.1155/2014/626732 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6

Author(s):

S. F. Smith ◽

K. R. Brye

Keyword(s):

Carbon Dioxide ◽

Soil Respiration ◽

Mississippi River ◽

Management Practices ◽

River Valley ◽

Mississippi River Valley ◽

Growing Seasons ◽

Lower Mississippi River ◽

Lower Mississippi River Valley

Ensuring the sustainability of cultivated soils is an ever-increasing priority for producers in the Lower Mississippi River Valley (LMRV). As groundwater sources become depleted and environmental regulations become more strict, producers will look to alternative management practices that will ensure the sustainability and cost-effectiveness of their production systems. This study was conducted to assess the long-term (>7 years) effects of irrigation (i.e., irrigated and dryland production) and tillage (conventional and no-tillage) on estimated carbon dioxide (CO2) emissions from soil respiration during two soybean (Glycine maxL.) growing seasons from a wheat- (Triticum aestivumL.-) soybean, double-cropped production system in the LMRV region of eastern Arkansas. Soil surface CO2fluxes were measured approximately every two weeks during two soybean growing seasons. Estimated season-long CO2emissions were unaffected by irrigation in 2011 (P>0.05); however, during the unusually dry 2012 growing season, season-long CO2emissions were 87.6% greater (P=0.044) under irrigated (21.9 Mg CO2ha−1) than under dryland management (11.7 Mg CO2ha−1). Contrary to what was expected, there was no interactive effect of irrigation and tillage on estimated season-long CO2emissions. Understanding how long-term agricultural management practices affect soil respiration can help improve policies for soil and environmental sustainability.

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Meander Loops and the Cahokia Site

American Antiquity ◽

10.2307/277637 ◽

1964 ◽

Vol 30 (1) ◽

pp. 89-91 ◽

Cited By ~ 3

Author(s):

Charles J. Bareis

Keyword(s):

Mississippi River ◽

River Channel ◽

River Valley ◽

Mississippi Valley ◽

Channel Migration ◽

Mississippi River Valley ◽

Lower Mississippi Valley

AbstractThe locations of certain mounds at the Cahokia site indicate that the rate of Mississippi River channel migration in the American Bottoms in the Upper Mississippi Valley has differed from the rate of channel movement in the Lower Mississippi Valley. The American Bottoms was probably the most favorable section of the Mississippi River Valley for long-term prehistoric settlement with regard to location within the present meander belt of the river.

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