Hydrological Regime of the Lower Volga River under Modern Conditions

Gorelits, O. V.; Ermakova, G. S.; Терский, П.Н.

doi:10.3103/s1068373918100035

Cited by 6 publications

(11 citation statements)

References 1 publication

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“…To make matters worse, hydrological conditions in the remaining sturgeon spawning habitat of the Volga are often unfavorable [52]. Under regulated conditions, the Volga's runoff volume during the April-July period of high water is 30% lower than that under natural conditions, but runoff during the December-March period surges to 65 km 3 -more than twice that measured prior to dam construction [53][54][55]. These flow dynamics are doubly detrimental to the small sturgeon populations remaining in the river.…”

Section: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Pueppke,

Nurtazin,

Murzashev

et al. 2023

Water

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Although Eurasia’s Caspian basin once supported the world’s richest and most diverse complex of sturgeon species, recent human activities have decimated populations of these ecologically and economically important fish. All five anadromous Caspian sturgeon species are critically endangered, and the potamodromous sterlet is also threatened. The precipitous decline of these species is due to a combination of factors that includes illegal, unreported, and unregulated (IUU) fishing; destruction of feeding and spawning habitat; water pollution; and the environmental consequences of climate change. International efforts are currently underway to re-establish sustained naturally reproducing sturgeon populations in the basin. Here, we update and review the status of sturgeon in the Caspian Sea with emphasis on the northern basin and the inflowing Volga and Ural rivers. We then focus on efforts to restore sturgeon in the Ural, which originates in Russia and flows through Kazakhstan before entering the Caspian Sea. With nearly ideal hydrological conditions for sturgeon, the Ural is the basin’s sole remaining river that allows migrating sturgeon unimpeded access to potentially productive spawning grounds. The challenge of re-establishing sturgeon in the Ural River exhibits the classical characteristics of wicked problems: ambiguous definitions, changing assumptions and unanticipated consequences, tradeoffs and economic dependencies, an incomplete and contradictory knowledge base, and no straightforward pathway toward a final solution. This challenge is examined here for the first time from the perspective of its wicked dynamics, with consideration given to approaches that have proven effective elsewhere in resolving wicked environmental problems.

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Section: The Caspian Basin As An Environment For Sturgeonmentioning

confidence: 99%

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Pueppke,

Nurtazin,

Murzashev

et al. 2023

Water

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“…The complexity of the reservoir operation problem depends on purposes compatibility. If the purposes are more compatible -less effort is needed for coordination [10]. The main peculiarity for the VKC management is the combination of many requirements of various sectors of the economy: technical safety, energy, navigation, water needs for domestic and industrial services, agriculture and irrigation, fishery, recreation and ecological requirements.…”

Section: Management Principlesmentioning

confidence: 99%

Hydropower in Russia: Case Study on Hydrological Management of the Volga-Kama Cascade

Терский¹,

Ermakova²,

Gorelits³

2022

Technological Innovations and Advances in Hydropower Engineering

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The capacity of hydroelectric power plants (HPPs) in the Russian Federation (RF) exceeds 50 GW. It is about 20% of the total capacity of all power plants in the country. The Volga River basin is the biggest in Europe with the catchment area of 1 360 000 km2. It covers the most populated and most industrialized part of the European Russia. The largest cascade of reservoirs in Russia and Europe is the Volga-Kama cascade (VKC) constructed in 1930–1980. It consists of 12 great water reservoirs and HPPs with total capacity about 12 GW. The main peculiarity for the VKC management is the combination of different requirements by various economy sectors: safety, energy, navigation, water needs for domestic and industrial services, agriculture and fishery, recreation and ecological rules. These sectors often make conflicting demands for the VKC operation. The VKC management principle is to balance and satisfy all of them taking into account the changing climate and economical effectiveness. Modern decisions for the VKC management are based on two principles. First is the constant optimization of the whole VKC management rules, taking into account both climate change and the Strategy of the country development. The second is the constant technical modernization of the VKC equipment to achieve the best economical effectiveness and safety for ecosystems and population.

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“…A series of helminthological studies were conducted in the Volga River delta, Russia, in the 1960s and early 1970s (Lugovoi and Kurochkin 1962;Chernobai 1966Chernobai , 1969Budkin 1974). This region has specific properties because the Volga River has strong seasonal dynamics (Gorelits et al 2018); therefore, the study birds had a unique dietary composition following regular flood events. Several large-scale studies were conducted in the 1950s and 1960s in other Eastern and central European countries (Macko 1957;Luft 1960;Stoimenov 1962;Rutkowska 1963;Baruš et al 1972;Koubek and Vojtek 1973).…”

Section: Introductionmentioning

confidence: 99%

Avian trematodes of central European corvids are heterogeneous regarding preferences for host species and age

Sitko,

Heneberg

2024

J. Helminthol.

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Corvids are highly adaptive birds that respond well to anthropogenic changes in their environment. Trematode communities of corvids were studied mainly in the 1950s through 1970s in regularly flooded parts of the Volga River delta in Russia; more recent studies and data from other regions where the corvids are in less contact with postflooding habitats are limited. Data for Corvus corax were lacking. Using our samples obtained from 1963 to 2023, we performed a large-scale analysis of trematode species composition and community structure in Corvus frugilegus, Corvus cornix, C. corax, Coloeus monedula, Pica pica, and Garrulus glandarius; all originated from the Czech Republic. We identified corvids as hosts of mutually overlapping component communities of only a few species of trematodes (Brachylecithum lobatum, Lyperosomum petiolatum, Lyperosomum longicauda, Tamerlania zarudnyi, Urogonimus macrostomus), with the presence of many rare and incidental findings of other trematode species. Only a few species used corvids as their core hosts (L. longicauda and B. lobatum). Trematode component communities in first-year birds included Prosthogonimus cuneatus, Prosthogonimus ovatus, Plagiorchis asperus, and Morishitium dollfusi due to an increased share of insects (intermediate hosts of Prosthogonimus and Plagiorchis) and snails (intermediate hosts of Morishitium) in the diet of juveniles. The trematode component communities of corvid species overlapped but were heterogeneous at the level of host individuals, likely reflecting differences in food sources related to the respective host ages and nesting sites.

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Hydrological Regime of the Lower Volga River under Modern Conditions

Cited by 6 publications

References 1 publication

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Re-Establishing Naturally Reproducing Sturgeon Populations in the Caspian Basin: A Wicked Problem in the Ural River

Hydropower in Russia: Case Study on Hydrological Management of the Volga-Kama Cascade

Avian trematodes of central European corvids are heterogeneous regarding preferences for host species and age

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