Water

Research

10 pages, 569 KiB

Open AccessArticle

Feeding of the Amphipod Gammarus aequicauda in the Presence of the Planktonic Cladoceran Moina salina and the Benthic Chironomid Larvae Baeotendipes noctivagus

by Nickolai Shadrin, Vladimir Yakovenko and Elena Anufriieva

Water 2022, 14(23), 3948; https://doi.org/10.3390/w14233948 - 4 Dec 2022

Cited by 4 | Viewed by 1685

Abstract

The energy balance approach helps to understand the limits within which the ‘predator–prey’ relationship can form, but cannot explain the formation of trophic links in natural multispecies systems. A time balance approach to the study of feeding has been developed to complement it. [...] Read more.

The energy balance approach helps to understand the limits within which the ‘predator–prey’ relationship can form, but cannot explain the formation of trophic links in natural multispecies systems. A time balance approach to the study of feeding has been developed to complement it. In the hypersaline Lake Moynaki (Crimea) which has a simple food web, there is one omnivorous species, Gammarus aequicauda, and two abundant prey, planktonic Moina salina and benthic Baeotendipes noctivagus. The size of M. salina ranges from 1.0 to 1.2 mm, and the size of B. noctivagus larvae from 9.0 to 10.0 mm. In experiments, elements of time balance were evaluated during feeding of G. aequicauda in the presence of both prey species, i.e., the duration of time spent searching before capture, handling prey, and resting between attempts to eat a chironomid larva. In all experiments, G. aequicauda consumed both kinds of prey. The maximum predation rate of G. aequicauda on the smaller sized M. salina was limited by searching and handling time, but on the larger B. noctivagus it was limited by digestion time. Feeding solely on chironomid larvae may well satisfy the energy needs of G. aequicauda. However, the food ration of G. aequicauda may be 50% higher if it feeds in the presence of both prey species than if feeding only on chironomid larvae. The presence of chironomid larvae more than halved the consumption of M. salina, compared to when cladocerans were the only prey. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

17 pages, 1236 KiB

Open AccessArticle

Daily Rhythms and Oxygen Balance in the Hypersaline Lake Moynaki (Crimea)

by Nickolai Shadrin, Elena Anufriieva, Alexander Latushkin, Alexander Prazukin and Vladimir Yakovenko

Water 2022, 14(22), 3753; https://doi.org/10.3390/w14223753 - 18 Nov 2022

Cited by 5 | Viewed by 1889

Abstract

Field observations of the diurnal behavior of several parameters (oxygen concentration, chlorophyll fluorescence, photosynthetically active radiation (PAR), wind speed, temperature, suspended matter concentration, and zooplankton abundance) were conducted at three sites in the marine hypersaline lake Moynaki (Crimea). The diurnal course of PAR [...] Read more.

Field observations of the diurnal behavior of several parameters (oxygen concentration, chlorophyll fluorescence, photosynthetically active radiation (PAR), wind speed, temperature, suspended matter concentration, and zooplankton abundance) were conducted at three sites in the marine hypersaline lake Moynaki (Crimea). The diurnal course of PAR followed a bell-shaped form, with the maximum at 14:00 on the 15th and 16th of September 2021. The oxygen concentration varied over a wide range from 3.2 to 9.3 mg L⁻¹, demonstrating a clear diurnal rhythm. From sunrise until about 17:30, it increased. Both the maximum and minimum values were marked on the site where there were Ruppia thickets. The daily rhythm of Chlorophyll a concentration was clearly expressed during the observation period, varying from 2.49 to 18.65 µg L⁻¹. A gradual increase in the concentration of chlorophyll a began after 10:00 and lasted until about 2:30–3:00 of the next day. The daily production of oxygen during photosynthesis averaged 27.3 mgO L⁻¹ day⁻¹, and the highest values were noted at the windward site of 37.9 mgO L⁻¹ day⁻¹, and the lowest at the leeward site of 19 mgO L⁻¹ day⁻¹. The total respiration of the community per day was, on average, 15.9 mgO L⁻¹ day⁻¹. It averaged 63% of the primary production created. The contribution of animals to the total oxygen consumption of the community was small, averaging 5%. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

13 pages, 2814 KiB

Open AccessArticle

Influence of Seawater Salinity on the Survival, Growth, Development and Neonate Production of Scapholeberis mucronata (O. F. Müller) (Crustacea: Cladocera)

by Lei Wang, Wen Zhao, Yuanzi Huo, Xuwang Yin, Jie Wei, Shan Wang and Yujie Wang

Water 2022, 14(22), 3706; https://doi.org/10.3390/w14223706 - 16 Nov 2022

Cited by 1 | Viewed by 2182

Abstract

The effect of salinity on the survival, growth, development and neonate production of the cladoceran Scapholeberis mucronata (O. F. Müller) was studied by using Chlorella pyrenoidosa as feed at 1, 2, 3, 4 salinity gradients and control group according to the pre-experiment and [...] Read more.

The effect of salinity on the survival, growth, development and neonate production of the cladoceran Scapholeberis mucronata (O. F. Müller) was studied by using Chlorella pyrenoidosa as feed at 1, 2, 3, 4 salinity gradients and control group according to the pre-experiment and median lethal concentration experiment. The acute effect of salinity on this species indicated that 4 and 4.5 was its limit superior of reproduction and survival. The survival rate and growth rate of individuals reared at 1 and 2 salinity gradients were higher than that of those reared at the other gradients. The mean size of the female adult decreased from 820 to 743 μm when the salinity increased from 1 to 4. Among individuals reared at 1 and 2, the intrinsic rate of natural increase (r_m) of population was 1.021 and 0.903, respectively; the rate of egg production was 1.281 and 1.390, respectively; the cumulative egg production was 83.2 and 106.0 and the mean life span was 16.05 and 17.30, respectively. These values of life history parameters were higher than those of individuals reared at 3. No eggs were produced by females reared at 4 during the whole experiment. Furthermore, individuals reared at 1 and 2 had faster embryonic development. The above results implied that S. mucronata is relatively well adapted to low-salinity conditions (1–2). Resting egg formation and sexual reproduction did not occur at all the tested salinity gradients. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

14 pages, 974 KiB

Open AccessArticle

The Prawn Palaemon adspersus in the Hypersaline Lake Moynaki (Crimea): Ecology, Long-Term Changes, and Prospects for Aquaculture

by Vladimir Yakovenko, Nickolai Shadrin and Elena Anufriieva

Water 2022, 14(18), 2786; https://doi.org/10.3390/w14182786 - 7 Sep 2022

Cited by 6 | Viewed by 2343

Abstract

For several years, the prawn Palaemon adspersus population was studied in a hypersaline lake (Crimea) for the first time. P. adspersus is a more halotolerant species than previously thought and can survive and breed up to a salinity of 55 g/L and probably [...] Read more.

For several years, the prawn Palaemon adspersus population was studied in a hypersaline lake (Crimea) for the first time. P. adspersus is a more halotolerant species than previously thought and can survive and breed up to a salinity of 55 g/L and probably higher. A significant positive correlation was found between the number and biomass of the prawns and the seagrass Ruppia shoot density. The spring temperature increase from 5.5 to 24 °C was accompanied by a significant increase in the prawn number (p = 0.001). In the males and females, the spatial heterogeneity of the distribution of prawns significantly (p = 0.005) negatively correlated with the abundance of prawns. In the period from 2018 to 2021, the area of Ruppia cover and the prawn abundance in the lake decreased, and a significant correlation was found between those changes. High salinity, judging by our data, can reduce the production potential of the species, but the absence of predators in Lake Moynaki allowed the prawns to reach a higher abundance than was observed in other habitats. P. adspersus can be successfully cultivated in hypersaline waters with a salinity up to 55 g/L as a perspective object for Integrated Multi-Trophic Aquaculture. The development of aquaculture in hypersaline waters may help to save freshwater resources, and the development of aquaculture in brines formed during the desalination of seawater will make it more economically viable to obtain freshwater from seawater. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

11 pages, 1289 KiB

Open AccessArticle

Artemia spp. (Crustacea, Anostraca) in Crimea: New Molecular Genetic Results and New Questions without Answers

by Anastasia Lantushenko, Yakov Meger, Alexandr Gadzhi, Elena Anufriieva and Nickolai Shadrin

Water 2022, 14(17), 2617; https://doi.org/10.3390/w14172617 - 25 Aug 2022

Cited by 6 | Viewed by 2412

Abstract

Many works have been devoted to the study of the molecular genetic diversity of Artemia in different regions; however, there are regions such as Crimea, the largest peninsula in the Black Sea, which has seen few studies. Artemia specimens from several Crimean hypersaline [...] Read more.

Many works have been devoted to the study of the molecular genetic diversity of Artemia in different regions; however, there are regions such as Crimea, the largest peninsula in the Black Sea, which has seen few studies. Artemia specimens from several Crimean hypersaline lakes were analyzed using the mitochondrial marker cytochrome oxidase C (COI). The analyzed individuals from bisexual populations formed clades with the species A. salina, A. urmiana, A. sinica, and A. monica (=A. franciscana). A. sinica and A. monica had not been recorded in Crimea previously. In Lake Adzhigol, the three species A. urmiana, A. sinica, and A. monica were found at the same time, which has not been noted anywhere before. In the Crimean lakes, a total of 10 haplotypes were found, six of them for the first time: Once for A. monica, once for A. sinica, and four for A. salina. Those haplotypes may be regarded as endemic to Crimea. In the 1990s, experiments were carried out in Lake Yanyshskoe using mainly purchased cysts of Artemia, so A. monica and A. sinica were introduced into Crimea and could then have easily been spread by birds to other Crimean lakes. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

17 pages, 2338 KiB

Open AccessArticle

Differences in Mercury Concentrations in Water and Hydrobionts of the Crimean Saline Lakes: Does Only Salinity Matter?

by Nickolai Shadrin, Aleksandra Stetsiuk and Elena Anufriieva

Water 2022, 14(17), 2613; https://doi.org/10.3390/w14172613 - 25 Aug 2022

Cited by 6 | Viewed by 2345

Abstract

Of significant scientific and public concern is the high toxicity, significant bioaccumulation, and magnified concentration within the food web of mercury (Hg). Hg content both dissolved and in suspended forms in water as well as in biomass of different hydrobiont taxa was studied [...] Read more.

Of significant scientific and public concern is the high toxicity, significant bioaccumulation, and magnified concentration within the food web of mercury (Hg). Hg content both dissolved and in suspended forms in water as well as in biomass of different hydrobiont taxa was studied in 18 saline lakes in Crimea from 2012 to 2021. The impact of different factors (salinity, seasonality, anthropogenic activities, geological background, etc.) was analyzed. The generalization of data for all lakes showed that the average concentration of Hg in dissolved form was 129 ng L⁻¹, varying over a wide range. The content of Hg in total suspended substrates was an average of 151 ng L⁻¹, and the total content of Hg in lake water averaged 291 ng L⁻¹. Geological background and anthropogenic activities can determine the total Hg content in lakes. In most lakes, a significant positive correlation was noted between the concentration of one, two, or all three indicators of Hg content and the month of the year, with indicators increasing from winter through to autumn. When analyzing the entire data array, a significant positive correlation was found between the concentration of the suspended form of Hg and salinity; such correlation between the concentration of the dissolved form of Hg and salinity was absent. The highest average Hg concentrations in biomasses were noted in Artemia and were the lowest in plants. Geological background and human activity contribute to high Hg content in lakes. Hydrobionts can significantly influence the distribution and behavior of Hg, being an important factor of its cycle in the lakes. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

13 pages, 1755 KiB

Open AccessArticle

The Sedimentation Rate in the Crimean Hypersaline Lake Aktashskoye Estimated Using the Post-Chernobyl Artificial Radionuclide ⁹⁰Sr as a Radiotracer

by Natalia Mirzoeva, Nickolai Shadrin, Vladislav Proskurnin, Svetlana Arkhipova, Igor Moseychenko and Elena Anufriieva

Water 2022, 14(16), 2506; https://doi.org/10.3390/w14162506 - 14 Aug 2022

Cited by 3 | Viewed by 2732

Abstract

Artificial ⁹⁰Sr is one of the most important long-lived radionuclides of global radioactive fallout from the atmosphere after the testing of nuclear weapons and the accident at the Chernobyl Nuclear Power Plant in 1986. In addition to fallout from the atmosphere, secondary [...] Read more.

Artificial ⁹⁰Sr is one of the most important long-lived radionuclides of global radioactive fallout from the atmosphere after the testing of nuclear weapons and the accident at the Chernobyl Nuclear Power Plant in 1986. In addition to fallout from the atmosphere, secondary radioactive contamination of Crimea was mainly from the Dnieper River and the North Crimean Canal, which occurred until 2014. ⁹⁰Sr was used as the optimal radiotracer for estimating the rate of sedimentation in the Crimean hypersaline lake. Its vertical distribution in the bottom sediments was assessed. In the core of the bottom sediments, the detectable activity of ⁹⁰Sr in layers 0–1.5 cm and 16.7–21.9 cm was absent, and it was determined again in the layer of 15.5 cm, which was associated with atmospheric fallout of the radionuclide after the Chernobyl NPP accident. There were well-isolated peaks of specific activity in layers at a depth of 4.6 and 13.3–14.3 cm. The calculated rate of sedimentation varied within 0.5–1.5 cm year⁻¹: the minimum rate corresponded to the period 1971–2017, and the highest rate corresponded to the period 1954–1971. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

22 pages, 5829 KiB

Open AccessArticle

Using Wavelet Analysis to Examine Long-Term Variability of Phytoplankton Biomass in the Tropical, Saline Lake Alchichica, Mexico

by Javier Alcocer, Benjamín Quiroz-Martínez, Martín Merino-Ibarra, Luis A. Oseguera and Miroslav Macek

Water 2022, 14(9), 1346; https://doi.org/10.3390/w14091346 - 21 Apr 2022

Cited by 2 | Viewed by 2197

Abstract

The phytoplankton biomass (chlorophyll-a, Chl-a) is directly related to the total production of lakes. Chl-a in temperate lakes oscillates on an annual scale. However, Chl-a oscillations in tropical lakes have hardly been documented, particularly over multiple years. Here, we described the periodicity of [...] Read more.

The phytoplankton biomass (chlorophyll-a, Chl-a) is directly related to the total production of lakes. Chl-a in temperate lakes oscillates on an annual scale. However, Chl-a oscillations in tropical lakes have hardly been documented, particularly over multiple years. Here, we described the periodicity of the Chl-a by performing a continuous wavelet analysis of 21 years (1998–2018), monthly Chl-a data from tropical, saline Lake Alchichica, Mexico. Parallel wavelet analyses were made on environmental time series (i.e., euphotic zone, mixed layer, temperature, dissolved oxygen concentration, dissolved inorganic nitrogen, soluble reactive phosphorus, soluble reactive silica). Throughout the time series, the wavelet transforms identified a regular and predictable annual cycle of the Chl-a associated with the warm-monomictic thermal-mixing pattern, the variability of the annual Chl-a cycle, and the presence of other cyclicities, 2-year and ~4–5 years, associated with external forcing agents (e.g., North Pacific Oscillation). The water quality variables display a recurrent annual cycle. At the same time, the trophic variables (nutrient concentration) showed the same cyclicity as Chl-a (1-year, 2-year, and 4-year), suggesting the external forcing agents promote Chl-a augment through nutrient increase made available from stronger, deeper, mixing periods. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

21 pages, 1841 KiB

Open AccessArticle

Applying Generic Water Quality Criteria to Cu and Zn in a Dynamic Aquatic Environment—The Case of the Brackish Water Formation Strömmen-Saltsjön

by Daniel Ragnvaldsson, Gunilla Herting, Anders Jönsson and Inger Odnevall

Water 2022, 14(6), 847; https://doi.org/10.3390/w14060847 - 8 Mar 2022

Cited by 4 | Viewed by 2361

Abstract

The EU Water Framework Directive stipulates that all EU waterways shall have good chemical and ecological status by 2027. Methodologies are described for how to assess and classify waterbodies and make 7-year management plans. Aquatic risk assessment methodologies and environmental quality standards are [...] Read more.

The EU Water Framework Directive stipulates that all EU waterways shall have good chemical and ecological status by 2027. Methodologies are described for how to assess and classify waterbodies and make 7-year management plans. Aquatic risk assessment methodologies and environmental quality standards are defined and a biotic ligand model methodology is available to assess the influence of water chemistry on the ability of aquatic organisms to take up metals. Aquatic status classification practices of naturally occurring river basin-specific metals are discussed, specifically how Cu and Zn water quality criteria guideline values have been adopted and defined for Swedish coastal and estuarine waters and how well they represent possible ecological risks. Calculations of bioavailability and ecotoxicity are conducted using recognised models for the Strömmen-Saltsjön water body in Stockholm, in which naturally occurring metals, especially Cu, have among the highest background concentrations of Sweden. Proposals are made to improve risk assessment methodologies to better reflect the vitality of living organisms, and to what extent current levels of these metals in Swedish waterways may influence their welfare. The study concludes that a more local assessment including, e.g., studies of the benthic fauna would be relevant for ecological status classification. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

17 pages, 21437 KiB

Open AccessArticle

Human-Induced Sharp Salinity Changes in the World’s Largest Hypersaline Lagoon Bay Sivash (Crimea) and Their Effects on the Ecosystem

by Elena Anufriieva, Elena Kolesnikova, Tatiana Revkova, Alexander Latushkin and Nickolai Shadrin

Water 2022, 14(3), 403; https://doi.org/10.3390/w14030403 - 28 Jan 2022

Cited by 16 | Viewed by 3339

Abstract

Lakes and lagoons play an important role worldwide, and salinity fluctuations significantly affect their ecosystems. Bay Sivash, the world’s largest hypersaline water body, underwent a sharp change in salinity, induced by the closing of the North Crimean Canal. To monitor a shift in [...] Read more.

Lakes and lagoons play an important role worldwide, and salinity fluctuations significantly affect their ecosystems. Bay Sivash, the world’s largest hypersaline water body, underwent a sharp change in salinity, induced by the closing of the North Crimean Canal. To monitor a shift in the ecosystem, a study was carried out from 2014 to 2020 at 15 sites of the lagoon. Since the closure of the canal, the average salinity increased from 22 g L⁻¹ (2013) to 94 g L⁻¹ (2020). Suspended solids and dissolved organic matter also increased. When salinity increased above 50 g L⁻¹, the number of taxa significantly decreased; this was a negative linear relation. The increase in salinity significantly changed the structure of zooplankton and benthos. The most dramatic changes occurred with the salinity increase from 25 to 70 g L⁻¹. Chironomidae larvae numbers began to increase greatly in the ecosystem of the bay, and since 2014, they have rapidly increased their contribution to the abundance of benthos and plankton. The concentration of benthic–planktonic species increased in plankton, in particular, in Harpacticoida and Chironomidae. At salinity above 80–90 g L⁻¹, nauplii and adult brine shrimp appeared to become abundant in plankton and benthos. The transit of the ecosystem to a new alternative state occurred. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

18 pages, 1827 KiB

Open AccessArticle

Metabarcoding under Brine: Microbial Ecology of Five Hypersaline Lakes at Rottnest Island (WA, Australia)

by Mattia Saccò, Nicole E. White, Matthew Campbell, Sebastian Allard, William F. Humphreys, Paul Pringle, Farid Sepanta, Alex Laini and Morten E. Allentoft

Water 2021, 13(14), 1899; https://doi.org/10.3390/w13141899 - 9 Jul 2021

Cited by 6 | Viewed by 4324

Abstract

Hypersaline ecosystems—aquatic environments where concentration of salt exceeds 35 g L⁻¹—host microbial communities that are highly specialised to cope with these extreme conditions. However, our knowledge on the taxonomic diversity and functional metabolisms characterising microbial communities in the water columns of [...] Read more.

Hypersaline ecosystems—aquatic environments where concentration of salt exceeds 35 g L⁻¹—host microbial communities that are highly specialised to cope with these extreme conditions. However, our knowledge on the taxonomic diversity and functional metabolisms characterising microbial communities in the water columns of hypersaline ecosystems is still limited, and this may compromise the future preservation of these unique environments. DNA metabarcoding provides a reliable and affordable tool to investigate environmental dynamics of aquatic ecosystems, and its use in brine can be highly informative. Here, we make use of bacterial 16S metabarcoding techniques combined with hydrochemical analyses to investigate the microbial patterns (diversity and functions) from five hypersaline lakes located at Rottnest Island (WA). Our results indicate lake-driven microbial aquatic assemblages that are characterised by taxonomically and functionally moderately to extremely halophilic groups, with TDS (total dissolved solids) and alkalinity amongst the most influential parameters driving the community patterns. Overall, our findings suggest that DNA metabarcoding allows rapid but reliable ecological assessment of the hypersaline aquatic microbial communities at Rottnest Island. Further studies involving different hypersaline lakes across multiple seasons will help elucidate the full extent of the potential of this tool in brine. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

18 pages, 1980 KiB

Open AccessFeature PaperArticle

Explaining Variation in Abundance and Species Diversity of Avian Cestodes in Brine Shrimps in the Salar de Atacama and Other Chilean Wetlands

by Stella Redón, Gonzalo Gajardo, Gergana P. Vasileva, Marta I. Sánchez and Andy J. Green

Water 2021, 13(13), 1742; https://doi.org/10.3390/w13131742 - 23 Jun 2021

Cited by 6 | Viewed by 3343

Abstract

Further biogeographical studies of parasites are vital to improve our understanding of biodiversity distribution and predict the impacts of global change. Hypersaline lakes are good laboratories to investigate the avian cestode abundance and species diversity given the abundance of hosts (waterbirds and Artemia [...] Read more.

Further biogeographical studies of parasites are vital to improve our understanding of biodiversity distribution and predict the impacts of global change. Hypersaline lakes are good laboratories to investigate the avian cestode abundance and species diversity given the abundance of hosts (waterbirds and Artemia) and their broad latitudinal distribution. We analysed cestode infection in brine shrimp Artemia franciscana in northern (Atacama) and central Chile and compared them to results from A. persimilis in southern Chile (Patagonia). Thus, we covered a broad latitudinal gradient from 23° to 53° S. Five cestode taxa including two species of the genus Flamingolepis, Gynandrotaenia stammeri, Eurycestus avoceti, and Fuhrmannolepis averini were recorded from A. franciscana in Atacama lagoons (prevalence = 4.1%). In contrast, no cestode infection was detected in central Chile, likely because they are temporary wetlands. Parasites of flamingos and shorebirds were associated with Atacama lagoons (arid and higher salinity), while Confluaria podicipina and Fimbriarioides sp. (parasites of grebes and ducks, respectively) were dominant in Patagonian lagoons (sub-antarctic and of lower salinity). These differences mirror changes in the relative abundance of the respective final hosts. The flamingo parasite Flamingolepis sp. 1 was the most prevalent and abundant cestode in Atacama, where it was recorded only in autumn. Seasonality and habitat effects (especially abundance and phenology of different bird species) appear to override any latitudinal trends in the prevalence, diversity, and distribution of cestodes. Cestode prevalence was higher in larger wetlands but was not related to the sex of either intermediate host. We recorded a greater taxonomic richness at the cestode family level in Atacama, but a greater dominance of a single family of avian hosts (the flamingos). Ours is the first spatio–temporal study of Artemia cestodes at local and regional scales in the southern hemisphere. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Graphical abstract

17 pages, 660 KiB

Open AccessFeature PaperArticle

Microphytobenthos in the Hypersaline Water Bodies, the Case of Bay Sivash (Crimea): Is Salinity the Main Determinant of Species Composition?

by Nickolai Shadrin, Daria Balycheva and Elena Anufriieva

Water 2021, 13(11), 1542; https://doi.org/10.3390/w13111542 - 30 May 2021

Cited by 9 | Viewed by 3646

Abstract

In hypersaline water bodies, the microphytobenthos plays a very important ecosystem role and demonstrates variability along with a salinity change. Due to anthropogenic activity, the sharp salinity increase in Bay Sivash occurred after 2014. To assess the changes in the microalgae community during [...] Read more.

In hypersaline water bodies, the microphytobenthos plays a very important ecosystem role and demonstrates variability along with a salinity change. Due to anthropogenic activity, the sharp salinity increase in Bay Sivash occurred after 2014. To assess the changes in the microalgae community during the bay ecosystem transformation, the study was conducted four times in 2018 and 2019. At every sampling period, the samples were taken in a salinity gradient (from 7 to 10 sites). A total of 40 species of microalgae were identified during all research, including Cyanobacteria (Cyanophyceae, 2 species), Ochrophyta (Bacillariophyceae, 35 species), Haptophyta (Prymnesiophyceae, 2 species), and Miozoa (Dinophyceae, 1 species). According to the calculated similarity indices of Jaccard and Czekanowski–Sørensen–Dice, the species composition significantly differed during sampling periods. A total of 15 species were recorded at salinities of 80–90 psu, and 10 species at higher salinities, which contribute 64% of all species found in this study. The microalgae abundance was two times more in the floating green algae mat than on the bottom. There was no significant correlation between the number of species and salinity in all sampling periods. In November 2018, a significant positive correlation between the number of species in the sample and total suspended solids (TSS) and dissolved organic matter (DOM) was revealed. A significant correlation between the cell length in different species and salinity and DOM concentration was noted. Before the onset of the salinity increase, 61 species of microalgae were found in Eastern Sivash, of which only 12 have now been recorded, 31% of the currently found species. The characteristics of the total microphytobenthos abundance also significantly changed during all studies. Many characteristics have changed in the bay: the concentration of total suspended matter and dissolved organic matter, the temperature regime, composition of zoobenthos and plankton, and oxygen concentration. Due to this, it is unlikely that only the salinity increase caused the microphytobenthos changes in the lagoon. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

13 pages, 576 KiB

Open AccessArticle

Zooplankton Community Structure in Shallow Saline Steppe Inland Waters

by Katalin Zsuga, Zarina Inelova and Emil Boros

Water 2021, 13(9), 1164; https://doi.org/10.3390/w13091164 - 23 Apr 2021

Cited by 6 | Viewed by 2818

Abstract

Several shallow saline waters can be found in Central Asia in arid steppe climate, but our knowledge of their zooplankton community has been so far rather limited. The aim of our research was to provide data on the steppe zooplankton community in a [...] Read more.

Several shallow saline waters can be found in Central Asia in arid steppe climate, but our knowledge of their zooplankton community has been so far rather limited. The aim of our research was to provide data on the steppe zooplankton community in a large-scale regional study. Therefore, a baseline survey was carried out in 23 shallow inland waters of different salinity in Northern Kazakhstan. We measured the quantity and identified the taxonomic composition of zooplankton in the spring period and examined changes in community structure in correlation with salinity. Lesser salt concentration of the hyposaline–mesosaline waters was indicated by the presence of halophilic rotifer species: Brachionus asplanchnoides, Br. dimidiatus, Br. plicatilis. Mesosaline and hypersaline waters were indicated by the presence of halobiont crustaceans: Moina salina, Arctodiaptomus salinus, Cletocamptus retrogressus. Very high concentration of salt was indicated by presence of Artemia alone which is the only group, that can tolerate and adapt to this extreme environment. In the hypersaline waterbodies at over 79 gL⁻¹ high TDS conditions a very simple tropical structure was found. Artemia playing monopolistic ecological function in the zooplankton community. We identified three characteristic groups of shallow inland saline waters based on their zooplankton composition. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

18 pages, 1758 KiB

Open AccessArticle

Aquatic Invertebrate Community Resilience and Recovery in Response to a Supra-Seasonal Drought in an Ecologically Important Naturally Saline Lake

by Lizaan de Necker, Luc Brendonck, Johan van Vuren, Victor Wepener and Nico J. Smit

Water 2021, 13(7), 948; https://doi.org/10.3390/w13070948 - 30 Mar 2021

Cited by 14 | Viewed by 4133

Abstract

Climate induced drought is a prominent threat to natural saline aquatic ecosystems by modifying their hydrology and salinity, which impacts the biodiversity of these ecosystems. Lake Nyamithi is a naturally saline lake in South Africa that experienced the effects of a two-year supra-seasonal [...] Read more.

Climate induced drought is a prominent threat to natural saline aquatic ecosystems by modifying their hydrology and salinity, which impacts the biodiversity of these ecosystems. Lake Nyamithi is a naturally saline lake in South Africa that experienced the effects of a two-year supra-seasonal drought (2015–2016). This study aimed to determine potential effects of the drought and accompanying increased salinity (between 9.8 and 11.5 g L⁻¹) on aquatic invertebrate communities of Lake Nyamithi, and assess their potential recovery following the drought. Aquatic invertebrates and water were collected for biodiversity and chemical assessments during predrought conditions (2014), the peak of the drought (2016) and after the site had received water (2017). Taxon richness was considerably reduced during the peak of the drought as many biota could not tolerate the increased salinity. Ecological resilience and recovery was evident in the lake since numerous biota (re)colonized the lake promptly after the site received water and salinity decreased (<8 g L⁻¹). By the end of 2017, invertebrate biodiversity exceeded that of predrought conditions. Although some biota may be able to temporarily cope with extreme weather conditions, frequent or prolonged periods of drought and increased salinity pose a threat to naturally saline lakes such as Nyamithi and dilution with fresh water is vital for the persistence of species diversity and ecological integrity. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

15 pages, 1300 KiB

Open AccessEditor’s ChoiceArticle

Trace Elements in the Bottom Sediments of the Crimean Saline Lakes. Is It Possible to Explain Their Concentration Variability?

by Nickolai Shadrin, Natalia Mirzoeva, Natalia Kravchenko, Oksana Miroshnichenko, Nataliya Tereshchenko and Elena Anufriieva

Water 2020, 12(9), 2364; https://doi.org/10.3390/w12092364 - 23 Aug 2020

Cited by 7 | Viewed by 3023

Abstract

Knowledge of trace elements content and their behavior in aquatic ecosystems is important for their sustainable use. There is a lack of such data for saline and, especially, hypersaline lakes and lagoons. Concentrations of more than 20 elements were evaluated in bottom sediments [...] Read more.

Knowledge of trace elements content and their behavior in aquatic ecosystems is important for their sustainable use. There is a lack of such data for saline and, especially, hypersaline lakes and lagoons. Concentrations of more than 20 elements were evaluated in bottom sediments of 15 saline/hypersaline lakes and Lagoon Sivash in Crimea. An average salinity varied from 4 to 335 g/L in studied water bodies. The concentration of the trace elements varied from lake to lake. The highest variability was recorded for Cd, from 4.13 mg/kg to below the detectable level (CV = 1.463), and for Se, from 5.52 to 0.05 mg/kg (CV = 1.053). The lowest variability demonstrated by Cr, from 368 to 17 mg/kg (CV = 0.463), and by V, from 67.8 to 1.7 mg/kg (CV = 0.481). According to the found content of studied elements, all lakes were separated into three groups, and Lagoon Sivash was not included in these clusters. Salinity affected the concentration of some elements in bottom sediments, and this effect was not linear or unidirectional. In some cases, the action of other factors, often unknown, masked the effect of salinity. The geochemical background affects the structure and functioning of aquatic ecosystems, but the state of these ecosystems can significantly modify this background. An understanding of the differences in the elemental composition of bottom sediments in different lakes is possible only based on an integrated consideration of the interaction of all landscape, intra-ecosystem, and anthropogenic processes and factors that can influence this. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

Review

Jump to: Research, Other

12 pages, 1334 KiB

Open AccessFeature PaperReview

Ecosystems of Inland Saline Waters in the World of Change

by Nickolai Shadrin, Elena Anufriieva and Gonzalo Gajardo

Water 2023, 15(1), 52; https://doi.org/10.3390/w15010052 - 23 Dec 2022

Cited by 7 | Viewed by 3234

Abstract

Ecosystems of inland saline waters play a significant role in the biosphere and human life. Various articles of this Special Issue are devoted to a wide range of issues of their study and management. This introductory article gives a general overview of the [...] Read more.

Ecosystems of inland saline waters play a significant role in the biosphere and human life. Various articles of this Special Issue are devoted to a wide range of issues of their study and management. This introductory article gives a general overview of the types of inland waters on the planet, as well as the features of their ecosystems, reflected in 18 articles of this Special Issue. Attention is also paid to modern problems of conservation and integrated sustainable use of aquatic ecosystems in a changing climate and increasing anthropogenic pressure on water bodies. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

22 pages, 6544 KiB

Open AccessEditor’s ChoiceReview

Contrasting Management and Fates of Two Sister Lakes: Great Salt Lake (USA) and Lake Urmia (Iran)

by Wayne A. Wurtsbaugh and Somayeh Sima

Water 2022, 14(19), 3005; https://doi.org/10.3390/w14193005 - 24 Sep 2022

Cited by 22 | Viewed by 9684

Abstract

Many saline lakes throughout the world are shrinking due to overexploitation of water in their drainage basins. Among them are two of the world’s largest saline lakes, the U.S.A.’s Great Salt Lake, and Iran’s Lake Urmia. Here we provide a comparative analysis of [...] Read more.

Many saline lakes throughout the world are shrinking due to overexploitation of water in their drainage basins. Among them are two of the world’s largest saline lakes, the U.S.A.’s Great Salt Lake, and Iran’s Lake Urmia. Here we provide a comparative analysis of the desiccation of these two lakes that provides insights on management decisions that may help save them and that are relevant to saline lake management worldwide. Great Salt Lake and Lake Urmia were once remarkably similar in size, depth, salinity, and geographic setting. High rates of population growth in both basins have fueled a demand for irrigated agriculture and other uses. In the Great Salt Lake basin, this development began in the late 1800’s and is continuing. The lake’s volume has decreased by 67%, with 75% of the loss driven by water development and 25% by a millennial drought which may portend the start of global climate change impacts. This has greatly increased salinities to 180 g·L⁻¹ stressing the invertebrates in the lake on which birds depend. Only 1% of people in the basin are employed in agriculture; thus, reducing the demand for irrigation development. Population densities in the Urmia basin are double those of the Great Salt Lake basin, and 28% of people are employed in agriculture. These demographics have led to a rapid increase in reservoir construction since 2000 and the subsequent loss of 87% of Lake Urmia’s volume. The water development of Lake Urmia was later, but much faster than that of Great Salt Lake, causing Urmia’s salinity to increase from 190 to over 350 g·L⁻¹ in just 20 years, with subsequent severe ecological decline. Dust storms from the exposed lakebeds of both systems threaten the health of the surrounding populations. To save these lakes and others will require: (1) transparent and collaborative involvement with local interest groups; (2) shifts away from an agricultural-based economy to one based on manufacturing and services; (3) consideration of the diverse ecosystem services of the lakes including mineral extraction, recreation, bird habitats in surrounding wetlands, and dust control. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Graphical abstract

Other

Jump to: Research, Review

9 pages, 850 KiB

Open AccessBrief Report

A Note of a Unique Inland, Saline Water Fishery: Brine Flies (Diptera: Ephydridae) of Lake Cuitzeo, Mexico

by Jaquelina Beatríz Calderón-Arreola, Javier Alcocer and Luis A. Oseguera

Water 2022, 14(6), 900; https://doi.org/10.3390/w14060900 - 14 Mar 2022

Cited by 2 | Viewed by 2214

Abstract

Fisheries in Cuitzeo, the second largest Mexican lake, used to take place on the permanent freshwater East and Central Basins as opposed to the temporal, saline, and initially thought barren West Basin. The 1980 fisheries collapse forced fishers to look for non-conventional fishing [...] Read more.

Fisheries in Cuitzeo, the second largest Mexican lake, used to take place on the permanent freshwater East and Central Basins as opposed to the temporal, saline, and initially thought barren West Basin. The 1980 fisheries collapse forced fishers to look for non-conventional fishing products elsewhere in the lake. The West Basin’s temporal, saline-alkaline, and shallow water provides exceptional habitat for ephydrids to flourish. Locally known as “pupa”, ephydrids are collected in large numbers. Although consumed since pre-Hispanic times, no other commercial fisheries of ephydrids are known worldwide. This study records the species composition and abundance of the “pupa” throughout an annual cycle in the West Basin, where fisheries occur. Two species were found: Ephydra hians and Lamproscatella muria. Ephydrids co-occurred in June and July at the end of the dry season when salinity was highest. L. muria was more abundant (954 ± 2385 ind m⁻²) than E. hians (94 ± 38 ind m⁻²). The relatively low salinity of the West Basin favoured L. muria over E. hians, which prefers higher salinities. This “pupa” fishery is still unpredictable due to the astatic nature of the lake, and hence limited economic importance to the local fishers. Full article

(This article belongs to the Special Issue Ecosystems of Inland Saline Waters)

► Show Figures

Figure 1

Journal Menu

Journal Browser

Ecosystems of Inland Saline Waters

Share This Special Issue

Special Issue Editors

Special Issue Information

Keywords

Benefits of Publishing in a Special Issue

Published Papers (19 papers)

Research

Review

Other

Further Information

Guidelines

MDPI Initiatives

Follow MDPI