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Токсичность природных вод Куршского залива в период массового развития цианобактерий для Daphnia magna Straus (Crustacea, Cladocera) и эмбрионов Lymnaea stagnalis (Linnaeus, 1758) (Mollusca, Gastropoda)

January 2016

Authors:

Mariia Smirnova

Institute of Oceanology. PP Shirshov Russian Academy of Sciences

The toxicity of the raw waters of the coastal part of the Curonian Lagoon in the National Park «Curonian Spit» during cyanobacterial "blooms" for the organisms of zooplankton and zoobenthos is experimentally proved. The impact of toxic water on planktic crustacean Daphnia magna Straus (Crustacea, Cladocera) and the development of broods of pulmonate water snail Lymnaea stagnalis (L., 1758) (Gastropoda) is described.

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سمية مخلفات مصفى الدورة على بعض اللافقريات المائية‬

May 2021

Mohammed J. Al-Obaidi

Toxicity of AL-Daura refinery waste was measured on three aquatic invertebrates, using bioassay. The study groups included, two species of cladocera, Daphnia magna and Simocephalus exspinosus, as well as two species of gastropoda, Lymnaea auricularia and Melanopsis nodosa, and two species of oligochaeta, Limondrilus hoffmeisteri and Branchiura sowerbyi. Three test positions were chosen out ... [Show full abstract] in the refinery waste treatment unit. They represent different stages of purification in the unit . Different scales were used to estimate waste toxicity on the organism. It included median lethal concentration (LC50), median effect concentration (EC50), median lethal time (LT50) and safe concentration (SC). Some analyses were used to .know resources of different responses. It was found that crustacea cladocera were more sensitive than digochaeta to the petroleum wastes. It was reported that the lethal percentage of cladocera was higher than oligochaeta. It was also noticed that oligochaeta was more sensitive than mollusca gastropoda. Regarding species„ sensitivity comparison under study, it was found that Daphnia magna was more sensitive than Simocephalus exspinosus, also that swimming effectiveness in the second species less impressed than the first species against petroleum wastes. No differences were noticed regarding cohesion sensitivity and activity in the two species of gastropoda. It was also found that oligochaeta, Branchiura sowerbyi species was more sensitive than Lemnodrilus hoffmeisteri species . Sub lethal impressions were not reported for both species of oligochaeta. It is shown from the recent study, that basins of treatment unit of Al-Daura refinery are graded in their wastes toxicity. The unit has a great role in minimizing wastes toxicity before they are sent to Tigris River.

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OBSERVATIONS ON THE EMBRYONIC DEVELOPMENT OF FRESHWATER PULMONATE SNAIL LYMNAEA ACUMINATA (LAMARCK,...

January 1970

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Distribution of algae and crustacea (Copepoda and Cladocera) in mountain lakes in Slovenia with diff...

April 1997

Background and purpose: In the Triglav National Park in the Julian Alps in the NW of Slovenia there are 14 lakes at an altitude between 1300 and 2200 m. In the last five years some of these lakes were faced with an increasing number of visitors. To evaluate tourists' influence combined with trans-boundary pollution, an intensive monitoring program started in 1991. The program was designed to ... [Show full abstract] provide a high quality biological and chemical datasets, as a baseline for the observation of long-term environmental changes. Material and methods: The lakes were sampled in September between 1991 and 1993. Physical and chemical parameters were measured at several points down a vertical profile. Transparency, temperature pH, conductivity and oxygen concentration were measured on-site, while concentrations of sulphate, nitrate, total nitrogen, phosphate, total phosphorus and chlorophyll a were undertaken in a laboratory, according to standardised methods. Biological investigations included qualitative and quantitative analyses of phytoplankton, periphyton, zooplankton and zoobenthos (Cladocera and Copepoda). Result and conclusion: The basic characteristics of all lakes is the large diversify of fauna and flora species. One hundred-ninety taxa of periphytic algae and 144 planktonic algal taxa were recorded. Ten planktonic and 28 benthic taxa of Crustacea were established as well. Despite the relatively large number of species of algae and crustacea, only a few are present throughout the full range of lakes. The introduction of fish and eutrophication are the main factors for biotic changes in some mountain lakes.

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Temperature-based variation of rRNA secondary structure models: A case study in the insect Drosophil...

January 2001 · Canadian Journal of Zoology

Georg F J Armbruster

The influence of a temperature default on ribosomal RNA (rRNA) secondary structure models was studied with the "Mfold" energy-optimization program. Folding models of the internal transcribed spacer (ITS) 1 rRNA for both Drosophila simulans (Insecta) and Isabellaria adriani (Gastropoda) were generated at two different temperatures. The folding models are compared with the models previously shown ... [Show full abstract] for the ITS-1 of D. melanogaster Oregon R strain and I. adriani. A search for phylogenetically informative ITS-1 folding motifs was conducted for D. simulans. In I. adriani, a new approach for ITS-1 secondary structure analyses is suggested. The paper also elucidates results inferred from three energy-optimizing programs (Mfold, GeneBee, and STAR). These three folding programs give different information on the structure and free energy of a ITS-1 rRNA molecule. Furthermore, secondary-structure models of the small subunit (ssu) rRNA of Daphnia pulex (Crustacea: Cladocera) were investigated. The ssu rRNA molecule is usually folded according to alignment information. Here, ssu folding patterns are computed with Mfold using two temperature conditions. The two Mfold models are compared with the alignment model previously suggested for D. pulex. Three cladoceran-specific motifs and a short stem motif within the ssu rRNA of eukaryotes are discussed with respect to structure and phylogenetic information.