scholarly journals ECOSYSTEMS STATE OF EASTERN AND WESTERN BASINS OF SAKSKOE LAKE (CRIMEAN REPUBLIC)

2021 ◽  
Vol 7 (73) (1) ◽  
pp. 218-228
Author(s):  
V. V. Chaban ◽  
I. I. Rudneva ◽  
N. V., Guskova ◽  
V. G. Shaida
Keyword(s):  
Total Content ◽  
The Other ◽  
Water Bodies ◽  
Lake Ecosystem ◽  
Western Basin ◽  
Eastern Basin ◽  
Building Activity ◽  
Anthropogenic Processes ◽  
Basin Brine ◽  
Resources Exploitation

Sakskoe Lake is the most thoroughly studied water body in Crimea. Its therapeutic mud and brine are exploited by balneological treatment methods. During the two centuries, when the lake was used by humans, it was subdivided into seven water bodies by dams, with two of these bodies (Eastern and Western) being now utilized for medical purposes, and the other five being protective. The Eastern (currently exploited) basin is now used to produce therapeutic mud and brine. The bottoms of the saline basins are covered by sediments: an upper layer of black silt, which is underlain by gray, steel-gray, occasionally bluish silt, which is used as therapeutic mud. The lake is fed by surface and groundwaters. Retaining dams and flood embankments erected in nearby ravines preclude desalination of the lake with flood and rain waters. Seawater is pumped to the lake through channels to preclude its drying. A quay is now actively constructed around the lake and will likely notably affect its hydrological and ecological conditions. The aim of the present study was the comparative analysis of the chemical and physical characteristics of the Eastern and Western basins of the Sakskoe Lake at the period of intensive building activity on their coasts at the summer period of 2019. Brine samples were collected at two tested sites in each of the lakes. Water salinity was measured by a PAL-06S LTA GO (Japan) refractometer and was expressed in ‰. The pH and Eh of the waters and oxygen dissolved in them were determined in the laboratory by an Expert-001 (Econix-Expert Moexa CoLtd, Russia) analyzer, with the use of appropriate Volta (Russia) selective electrodes. Ions concentration was determined spectrophotometrically and by atomic absorption method. Various living stages of Artemia populations in two water bodies were studied according the standard microscopic methods. The obtained results demonstrated, that the total content of the cations in the brine of the Western basin was in 1,5-fold higher as compared with the data of the brine in the Eastern basin (108,4 and 71,2 g/l respectively). The values were directly correlated with the high salinity of the Western basin brine. The identical trend was shown for the anions concentration, which was significantly greatly in the Western basin related to Eastern one (193,14 and 125,41 g/l correspondingly), which was connected with the different hydrogeological conditions of the formation of the ecosystems of the tested water bodies. At the other hand, pH, salinity and Eh of the brine in the Eastern basin were lower than in the brine of the Western basin, while the concentration of dissolved oxygen was higher. In the brine of the Eastern basin of the lake all living stages of Artemia, including cysts, nauplia and adults were found, while in the Western basin only cysts were shown. Therefore, according the obtained results we could suggest, that anthropogenic processes which were taken place on the coasts of the Sakskoe Lake accompanied with the intensive building activity did not influence on the lake ecosystem. The further monitoring studies including the testing of the ions concentrations in the brine of two basins, Artemia populations state are required for the understanding the changes of the both ecosystems and the possible reasons of their changes. It is important for development of the optimization of the management of Sakskoe lake and its resources exploitation.

Maturity and Fecundity of Walleyes from the Eastern and Western Basins of Lake Erie

1969 ◽  
Vol 26 (7) ◽  
pp. 1877-1888 ◽  
Author(s):  
David R. Wolfert
Keyword(s):  
Lake Erie ◽  
The Other ◽  
Western Basin ◽  
Eastern Basin ◽  
Total Length ◽  
Younger Age ◽  
Mean Diameter ◽  
The Mean ◽  
Egg Diameter ◽  
Accurate Indicator

Of 2427 walleyes (Stizostedion vitreum vitreum (Mitchill)) examined from Lake Erie in 1964–66, no females were mature at ages below III and all were mature at age V. All male walleyes from the eastern basin were mature at age II, and those from the western basin at age III. Females from the western basin matured at a shorter length and a younger age than those from the eastern basin. Males from the western basin, on the other hand, matured at a longer length and greater age than those from the eastern basin.Egg production, which was estimated for 60 walleyes from the eastern basin and 78 from the western basin, ranged from 48,000 to 614,000. The number of eggs increased rapidly with increase in total length, but the relation between fecundity and weight was almost linear. Walleyes from the western basin were much more fecund for any given length, weight, or age than those from the eastern basin. Weight was the most accurate indicator of fecundity. The mean diameter of eggs from 32 ripe walleyes was 1.72 mm. Little relation existed between egg diameter and length or age of fish.

scholarly journals Ecology of aerobic anoxygenic phototrophic bacteria along an oligotrophic gradient in the Mediterranean Sea

2011 ◽  
Vol 8 (4) ◽  
pp. 973-985 ◽  
Author(s):  
D. Lamy ◽  
C. Jeanthon ◽  
M. T. Cottrell ◽  
D. L. Kirchman ◽  
F. Van Wambeke ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Bacterial Growth ◽  
Growth Response ◽  
Anoxygenic Phototrophic Bacteria ◽  
Carbon Limitation ◽  
Organic Substrates ◽  
Western Basin ◽  
Eastern Basin ◽  
Nutrient Additions ◽  
The Mediterranean

Abstract. Aerobic anoxygenic phototrophic (AAP) bacteria are photoheterotrophic prokaryotes able to use both light and organic substrates for energy production. They are widely distributed in coastal and oceanic environments and may contribute significantly to the carbon cycle in the upper ocean. To better understand questions regarding links between the ecology of these photoheterotrophic bacteria and the trophic status of water masses, we examined their horizontal and vertical distribution and the effects of nutrient additions on their growth along an oligotrophic gradient in the Mediterranean Sea. Concentrations of bacteriochlorophyll-a (BChl-a) and AAP bacterial abundance decreased from the western to the eastern basin of the Mediterranean Sea and were linked with concentrations of chlorophyll-a, nutrient and dissolved organic carbon. Inorganic nutrient and glucose additions to surface seawater samples along the oligotrophic gradient revealed that AAP bacteria were nitrogen- and carbon-limited in the ultraoligotrophic eastern basin. The intensity of the AAP bacterial growth response generally differed from that of the total bacterial growth response. BChl-a quota of AAP bacterial communities was significantly higher in the eastern basin than in the western basin, suggesting that reliance on phototrophy varied along the oligotrophic gradient and that nutrient and/or carbon limitation favors BChl-a synthesis.

scholarly journals Análisis comparativo de los moluscos en la reserva de la biosfera Los Petenes y lagunas costeras del sureste de México

2018 ◽  
Vol 47 (1) ◽  
Author(s):  
Alicia González-Solis ◽  
Daniel Torruco ◽  
Ángel D. Torruco-González
Keyword(s):  
Comparative Evaluation ◽  
Environmental Changes ◽  
Sediment Cores ◽  
Biosphere Reserve ◽  
Study Data ◽  
The Other ◽  
Water Bodies ◽  
Terminos Lagoon ◽  
Multiple Uses ◽  
Trophic Chains

The phylum Mollusca is widely distributed in all types of environments. The species it contains are important for their multiple uses as food (as part of several trophic chains), as vectors of other groups of organisms, for the extraction of substances, and as sentinels ofnatural and induced environmental changes. In this work, a comparative evaluation of the malacological biodiversity associated with different habitats in the Los Petenes Biosphere Reserve in Campeche and in eight coastal water bodies in southeastern Mexico was performed.To obtain data comparable to those that were used in a previous study, data from the Los Petenes mollusks were obtained by collection of sediment cores 10 cm in diameter at a depth of 15 cm at 20 sites in different habitats every four months during 2014. For the other lagoons,records were obtained from various published sources. For Los Petenes, a total of 175 species and 12,850 individuals were recorded. The species Rissoella caribaea was the most common and the most abundant. Comparative evaluation of each of the habitats that coexist in this ecosystem did not show significant changes in abundance. Similarly, faunal associations exhibited a sea-land gradient, and although thedifferences in biomass were significant, species richness did not show the same pattern among habitats. The Los Petenes system as a whole exhibited some of the greatest biodiversity among the water bodies analyzed, and the Terminos lagoon showed the highest biodiversity (169and 175 species, respectively). In contrast, the Sabancuy estuary featured fauna records with a richness of 43 species; in the Tupilco-Ostión lagoon, only 62 species were recorded, and in the rest of the lagoons, the numbers of species were even lower.

scholarly journals Příspěvek k poznání vodní malakofauny Hrubého Jeseníku, Rychlebských hor, Zlatohorské vrchoviny a Žulovské pahorkatiny (severní Morava, Česká Republika) [Contribution to the knowledge of aquatic molluscs of the Hrubý Jeseník Mountains, the Rychlebské hory Mountains, the Zlatohorská vrchovina Highlands and the Žulovská pahorkatina Highlands (Northern Moravia, Czech Republic)]

2003 ◽  
Vol 2 ◽  
pp. 3-10
Author(s):  
Luboš Beran
Keyword(s):  
Czech Republic ◽  
Nature Reserve ◽  
Lymnaea Stagnalis ◽  
First Record ◽  
The Other ◽  
Water Bodies ◽  
Galba Truncatula ◽  
Radix Peregra

Aquatic malacofauna of the Hrubý Jeseník Mountains, the Rychlebské hory Mountains, the Zlatohorská vrchovina Highlands and the Žulovská pahorkatina Highlands (Northern Moravia, Czech Republic) was investigated in 2000, 2001 and 2003. Altogether 26 species (17 gastropods, 9 bivalves) were found at 56 localities. Species Galba truncatula, Radix peregra s.str., Ancylus fluviatilis and P. casertanum, which often inhabit springs and smaller brooks, belong to the most common molluscs in this territory. Ponds and different water bodies originated by mining enrich aquatic malacofauna of this area by e.g., Lymnaea stagnalis, Gyraulus albus, G. crista, Hippeutis complanatus, Anodonta anatina or Musculium lacustre. The finding of Ferrissia clessiniana is the first record of this non-native mollusc in the territory of Northern Moravia. Water bodies in the Vidnavské mokřiny Wetlands Nature Reserve on the Czech-Poland frontier are inhabited by molluscan community with many species living in lowlands and this community is different in comparison with molluscan communities of the other investigated localities.

scholarly journals Does behavioural thermoregulation underlie seasonal movements in Lake Erie walleye?

2018 ◽  
Vol 75 (3) ◽  
pp. 488-496 ◽  
Author(s):  
Graham D. Raby ◽  
Christopher S. Vandergoot ◽  
Todd A. Hayden ◽  
Matthew D. Faust ◽  
Richard T. Kraus ◽  
...  
Keyword(s):  
Lake Erie ◽  
Seasonal Migration ◽  
Central Basin ◽  
Behavioural Thermoregulation ◽  
Long Distance ◽  
Western Basin ◽  
Eastern Basin ◽  
Temperature Records ◽  
Thermal Preferences

Thermoregulation is presumed to be a widespread determinant of behaviour in fishes, but has not often been investigated as a mechanism shaping long-distance migrations. We used acoustic telemetry and animal-borne thermal loggers to test the hypothesis that seasonal migration in adult walleye (Sander vitreus) in Lake Erie is size- and (or) sex-specific and related to behavioural thermoregulation. Female walleye migrated out of the warm, shallow western basin earlier than did males and were 1.8 times more likely to be detected on acoustic receivers in the deeper and cooler eastern basin. The few fish that remained in the western basin were restricted to a smaller range of higher temperatures (≥20 °C) than those that migrated to the central and eastern basins (∼16–21 °C). However, temperature records from walleye in the central basin were nearly indistinguishable from those in the eastern basin, suggesting thermal preferences alone could not explain migration to the eastern basin. As such, our effort to understand the mechanisms that cause migratory behaviours has generated mixed evidence on the role of temperature and that factors like foraging opportunities may have synergistic roles in the migration.

scholarly journals Changes of S-alk(en)ylcysteine sulfoxide levels during the growth of different garlic morphotypes

2011 ◽  
Vol 29 (No. 4) ◽  
pp. 373-381 ◽  
Author(s):  
J. Horníčková ◽  
R. Kubec ◽  
J. Velíšek ◽  
CejpekK ◽  
J. Ovesná ◽  
...  
Keyword(s):  
Amino Acids ◽  
Total Content ◽  
Vegetation Period ◽  
The Other ◽  
Flowering Plant ◽  
Other Hand

The contents of three S-alk(en)ylcysteine sulfoxides (alliin, methiin, and isoalliin) were determined in the leaves, pseudostems, and bulbs of six garlic genotypes (two flowering plant morphotypes, two semi bolters, and two scape absent morphotypes) cultivated for five consecutive years at the same location. The average levels of alliin, methiin, and isoalliin were found to be as follows: 1.92, 0.44, and 0.07 mg/g fw in the leaves, 1.57, 0.27, and 0.08 mg/g fw in the pseudostems, and 1.71, 0.20 and 0.13 mg/g fw in the bulbs, respectively. No statistically significant year-to-year differences were observed between the samples. Furthermore, the total contents and relative proportions of S-alk(en)ylcysteine sulfoxides in various parts of the plants (leaves, pseudostems, bulbs and roots) were evaluated in detail during the whole vegetation period. It was observed that the total content of these amino acids gradually decreased in all parts except for the bulbs. In the bulbs, the total content initially decreased after planting but significantly increased in June and culminated before harvest. Analogous trends were also observed for alliin and methiin concentrations. On the other hand, isoalliin levels steadily decreased during the whole vegetation period in all parts of the plants.

Seasonal Distribution, Constitution, and Abundance of Zooplankton in Lake Erie

1969 ◽  
Vol 26 (9) ◽  
pp. 2459-2476 ◽  
Author(s):  
Charles C. Davis
Keyword(s):  
Chlorophyll A ◽  
Lake Erie ◽  
Seasonal Distribution ◽  
Severe Weather ◽  
The Other ◽  
Western Basin ◽  
Lake Morphology ◽  
Similar Series ◽  
Ice Conditions ◽  
Work Done

Zooplankton samples, collected by vertical hauls from near bottom to the surface, were obtained from 28 stations along the length of Lake Erie in October 1967. A partial similar series, confined largely to the Western Basin because of ice conditions, was collected in January 1968. The results of the analyses are tabulated as numbers of individuals per m3, and are discussed. Comparisons are made with results previously published for a comparable series of stations visited in July 1967.As in July, distinct differences were to be seen among the three major basins (Western, Central, and Eastern) in the October results. These differences are summarized. In July an expected decrease in zooplankton, such as would be predicted from lake morphology, amount of runoff from rivers, etc., occurred from west to east in the lake. In October, however, the zooplankton of the Western Basin was extremely impoverished, and the expected distribution of biomass was reversed. It is shown, on the other hand, from work done by others on samples taken from the same series of stations in October, that phytoplankton, chlorophyll a, and seston exhibited the expected distribution, emphasizing the danger of judging an ecosystem by the examination of only limited components of the community and at single periods of the year.In July the bulk of the zooplankters consisted of large cladocerans (especially daphnids) and copepods. In October there were much larger populations of rotifers and of small cladocerans (Bosmina, Chydorus). Copepods were relatively sparse. The January samples were characterized by greater numbers and a greater variety of diaptomids than in October, and the rotifers remained very important. All of the January samples contained many partially decayed microcrustaceans. This was interpreted as indicating a seasonal die-off associated with the very severe weather of the period.

scholarly journals Radiological Assessment of Reservoirs in Volyn Region that is Under Radioactive Contamination

2020 ◽  
Keyword(s):  
Heavy Metals ◽  
Radioactive Contamination ◽  
Scientific Information ◽  
Total Content ◽  
Ecological Monitoring ◽  
Water Bodies ◽  
Toxic Substances ◽  
Zinc Cadmium ◽  
Heavy Metal Salts ◽  
The Village

Purpose. To determine the content of radionuclides 137Сs, 90Sr and heavy metals in water bodies within the boundaries of settlements of Kamyn-Kashirsky, Lyubeshivsky and Manevychi administrative districts of Volyn region. Methods. During the expedition and laboratory work, standard methods of sampling, preparation and measurement of samples were used according to the current methods of radiochemical, radiospectrometric, ichthyological, hydrochemical, statistical analyses, etc. The determination of the total content of heavy metals was performed in laboratory conditions by conventional methods. Results. The research is based on its own analyses, as well as the stock materials of the Scientific Information Center for Water Management and Ecological Monitoring and Optimization of Water Use. Features of 137Сs, 90Sr radionuclides distribution in reservoirs (water, sediments, fish, birds) within the zone of radioactive contamination in Volyn Region are considered. The maximum concentrationі of 137Сs, 90Sr in the studied area were determined. The anthropogenic impact and excess of the maximum permissible concentrations and maximum permissible levels of toxic substances in the ecosystem links of certain water bodies of the partially contaminated region are identified. Conclusions. As a result of the study on the level of concentrations of 137Сs and 90Sr and heavy metals in water (within the boundaries of settlements) of the investigated area, it was found that reservoirs in village of Prylisne, village of Velyka Osnytsya, village of Cherevakha in Manevitsky District, village of Nuyno in Kamin-Kashirsky District and the village of Vetly in Lyubeshiv Administrative Distict are affected by the highest concentrations of 137Сs and 90Sr. The significant content of heavy metal salts is recorded in the reservoirs, namely in the village of Serhiv – lead, village of Prylisne in Manevytskyi District– zinc, cadmium; in the village Berezna Volia in Lyubeshiv District – copper; in the village of Nuyno in Kamin-Kashirsky District – lead.

scholarly journals Příspěvek k poznání vodní malakofauny Hrubého Jeseníku, Rychlebských hor, Zlatohorské vrchoviny a Žulovské pahorkatiny (severní Morava, Česká Republika) [Contribution to the knowledge of aquatic molluscs of the Hrubý Jeseník Mountains, the Rychlebské hory Mountains, the Zlatohorská vrchovina Highlands and the Žulovská pahorkatina Highlands (Northern Moravia, Czech Republic)]

2003 ◽  
Vol 2 ◽  
pp. 3-10
Author(s):  
Luboš Beran
Keyword(s):  
Czech Republic ◽  
Nature Reserve ◽  
Lymnaea Stagnalis ◽  
First Record ◽  
The Other ◽  
Water Bodies ◽  
Galba Truncatula ◽  
Radix Peregra

Aquatic malacofauna of the Hrubý Jeseník Mountains, the Rychlebské hory Mountains, the Zlatohorská vrchovina Highlands and the Žulovská pahorkatina Highlands (Northern Moravia, Czech Republic) was investigated in 2000, 2001 and 2003. Altogether 26 species (17 gastropods, 9 bivalves) were found at 56 localities. Species Galba truncatula, Radix peregra s.str., Ancylus fluviatilis and P. casertanum, which often inhabit springs and smaller brooks, belong to the most common molluscs in this territory. Ponds and different water bodies originated by mining enrich aquatic malacofauna of this area by e.g., Lymnaea stagnalis, Gyraulus albus, G. crista, Hippeutis complanatus, Anodonta anatina or Musculium lacustre. The finding of Ferrissia clessiniana is the first record of this non-native mollusc in the territory of Northern Moravia. Water bodies in the Vidnavské mokřiny Wetlands Nature Reserve on the Czech-Poland frontier are inhabited by molluscan community with many species living in lowlands and this community is different in comparison with molluscan communities of the other investigated localities.

scholarly journals Más allá del ʻinfierno verdeʼ y del ʻparaíso perdidoʼ

2019 ◽  
Author(s):  
Stefano Pau
Keyword(s):  
Natural Resources ◽  
Environmental Problems ◽  
The Other ◽  
Human Being ◽  
Garden Of Eden ◽  
Long Time ◽  
The One ◽  
Western View ◽  
Resources Exploitation ◽  
The Relationship

The Western view of the Amazon rainforest landscape has been for a long time (and partly still is) functional to the colonial ideology and aimed at its natural resources exploitation. Since the colonial penetration, a whole set of myths was created, which crystallised in two stereotyped and opposed images. On the one hand, the Amazonian landscape as ʻgreen hellʼ; on the other, the forest as the Garden of Eden. This paper will approach the theme of landscape and the relationship between human being and nature through the analysis of two Peruvian novels: Paiche, by César Calvo de Araújo and La virgen del Samiria by Róger Rumrrill, which outline a reflection on environmental problems.

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