Accumulation Features of Micro and Macroelements in Indigenous and Alien Molluscs in Saldanha Bay, South Africa

Bezuidenhout, J; Nekhoroshkov, Pavel; Zinicovscaia, Inga; Yushin, Nikita; Frontasyeva, Marina

doi:10.2478/eces-2020-0030

Cited by 6 publications

(8 citation statements)

References 29 publications

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“…From a comparison of the maximums in the calcite sharpest pole figure (0006), it can be seen that the first sample with a maximum at 12.94 MRD is closer to the second one (11.5 MRD) than to the third (10.35 MRD). The fact that such a trend is not observed for the second calcite pole figure (10)(11)(12)(13)(14) and both aragonite pole figures can be explained by measurement errors, that, at the pole density maximum, are approximately 0.2 MRD. Furthermore, the changes between the maximums of the same pole figures of the three samples are in the range of variability identified for the genus Mytilus [24].…”

Section: Crystallographic Texture Resultsmentioning

confidence: 93%

“…The samples of mussels were collected from three stations in the Saldanha Bay from April 16 to May 09, 2019, before the spawning period ( Figure 1 ). The stations were chosen as the most representative in terms of availability of mussels, stability of environmental parameters, and differences in pollution level according to previous studies [ 13 , 14 , 15 , 16 ]:…”

Section: Methodsmentioning

confidence: 99%

“…To decrease the inter-individual variability, which was previously studied [ 14 , 16 ], the soft tissues and shells of all mussels from each site were grouped into pooled samples and homogenized.…”

Section: Methodsmentioning

confidence: 99%

“…The shells consist of two mineral phases which are calcite and aragonite. The most intense diffraction reflections corresponding to crystallographic planes with Miller indices (0006) and (10)(11)(12)(13)(14) for calcite and (012)/(121) and (102)/(200) for aragonite were analyzed. The neutron diffraction pattern for one of the samples is presented in Figure 2, and it is the sum of 1368 partial patterns measured for different directions.…”

Section: Statisticsmentioning

confidence: 99%

“…However, according to ecological state reports, the concentrations of trace elements in mussels from the studied area decreased in the last decade [ 9 ]. In mussels from the Saldanha area, the levels of elements were analyzed by several authors [ 11 , 12 ], including our works [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Elemental Content of Shells of the Bivalve Mollusks (Mytilus galloprovincialis) from Saldanha Bay (South Africa) on Their Crystallographic Texture

Nekhoroshkov

Zinicovscaia

Nikolayev

et al. 2021

Biology

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A both wild and farmed mussels in natural conditions, anthropogenic inputs are usually reflected in the increase of the content of specific elements. To determine the possible effect of the elemental patterns of farmed and wild mussels (Mytilus galloprovincialis) collected in the Saldanha Bay area (South Africa) on the crystallographic texture of the shells, the content of 20 elements in shells and 24 in the soft tissue of mussels was determined by neutron activation analysis. The crystallographic texture of mussel shells was analyzed using time-of-flight neutron diffraction. The wild mussels from open ocean site live in stressful natural conditions and contain higher amounts of the majority of determined elements in comparison with mussels farmed in closed water areas with anthropogenic loadings. The changes between the maximums of the same pole figures of the three samples are in the range of variability identified for the genus Mytilus. The content of Cl, Sr, and I was the highest in mussels from the open ocean site, which is reflected by the lowest mass/length ratio. The determined crystallographic textures of mussels are relatively stable as shown in the analyzed pole figures despite the concentrations of Na, Mg, Cl, Br, Sr, and I in shells, which significantly differ for wild and farmed mussels. The stability of the crystallographic texture that we observed suggests that it can be used as a reference model, where if a very different texture is determined, increased attention to the ecological situation should be paid.

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Section: Crystallographic Texture Resultsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Statisticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of the Elemental Content of Shells of the Bivalve Mollusks (Mytilus galloprovincialis) from Saldanha Bay (South Africa) on Their Crystallographic Texture

Nekhoroshkov

Zinicovscaia

Nikolayev

et al. 2021

Biology

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The Effect of Maintenance Works to Physical and Chemical Conditions of Small Rivers in Agricultural Areas

Brysiewicz

Czerniejewski

Bonisławska

et al. 2022

Ecological Chemistry and Engineering S

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Abiotic and biotic bounty of riparian waters may be affected by inadequate maintenance works. Improper planning and execution of maintenance works cause changes to hydrological and hydrochemical condition of water in small rivers, affecting biocenose of riverbeds by modifying the taxonomic composition of organisms inhabiting the regulated river section. Five (5) rivers were subject to studies - Plonia, Mysla, Tywa, Rurzyca, and Wardynka (Odra river basin), which were monitored before and after maintenance works consisting in desilting, mowing and removal of aquatic plants. This study examined hydrological (mean depth and width of small rivers, speed and flow), physical and chemical parameter of water (temperature, pH, O2, N-NO3, N-NH4, P-PO4) before and after dredging of selected rivers. Obtained results and resulting statistical analysis demonstrated increase in hydrological indices - depth, width, speed and flow. Among other physical and chemical properties that significantly increased following completion of maintenance works, were O2 and NH4. NO3 concentration and temperature dropped, but not statistically significant. Changes in hydrological and hydrochemical properties of waters caused by maintenance works may affect biodiversity of the regulated river sections, including changes in composition of ichthyofauna species.

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Physicochemical Changes and Abundance of Freshwater Snails in Anambra River (Nigeria) During the Rainy Season

Okoye

Echude

Chiejina

et al. 2022

Ecological Chemistry and Engineering S

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Rapid diversification is a way of responding to environmental change for freshwater organisms. This work examined the physicochemical changes and abundance of freshwater snails in Anambra River (Nigeria) during the rainy season. Field studies were conducted fortnightly from June to August 2019 at three stations of the river namely: Otuocha (station I), Otunsugbe (station II), and Ukwubili (station III) about 8.35 kilometers apart from each other. A scoop net of 2 cm mesh size and handpicking was used to sample freshwater snails randomly and water samples were taken to the laboratory for physicochemical analysis. A total of 896 freshwater snails belonging to 6 species (Afropomus balanoidea, Pomacea maculata, Lymnea stagnalis, Lanistes ovum, Pila wernei, and Saulea vitrea) were collected. Pomacea maculata was the most dominant species with a relative abundance of 45.87 %, while Saulea vitrea was the least dominant species with a relative abundance of 2.34 %. There was a significant negative correlation between dissolved oxygen and Pomacea maculate (r = –0.877, p = 0.002) and a positive correlation between dissolved oxygen and Stagnalis lymnea (r = 0.840, p = 0.005). The diversity of species was highest at Otuocha (1.171) followed by Ukwubili (1.133) and Otunsugbe (0.856) with average mean temperatures of (23.1 ±0.1) °C, (27.30 ±0.00) °C, and (26.80 ±0.03) °C respectively. The distribution of freshwater snails was influenced by the physicochemical variability of Anambra River during the rainy season. Therefore, further studies for a longer time and different seasons to examine the impact of physicochemical changes on the snail distribution are encouraged.

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Accumulation Features of Micro and Macroelements in Indigenous and Alien Molluscs in Saldanha Bay, South Africa

Cited by 6 publications

References 29 publications

Effect of the Elemental Content of Shells of the Bivalve Mollusks (Mytilus galloprovincialis) from Saldanha Bay (South Africa) on Their Crystallographic Texture

Effect of the Elemental Content of Shells of the Bivalve Mollusks (Mytilus galloprovincialis) from Saldanha Bay (South Africa) on Their Crystallographic Texture

The Effect of Maintenance Works to Physical and Chemical Conditions of Small Rivers in Agricultural Areas

Physicochemical Changes and Abundance of Freshwater Snails in Anambra River (Nigeria) During the Rainy Season

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