Key-words:Astacus astacus, Austropotamobius torrentium, crayfish, distributionThe species Austropotamobius torrentium and Astacus astacus are two species known in the EU directives to require deeper understanding of their autecologic requirements before any sustainable conservation effort could be successfully applied. Therefore, the paper aims to analyze the occurrence of these two species of crayfish in the Anina Mountains (Romania) in relation to several physical-chemical indicators measured on site. The results suggest that the anthropogenic impacts registered in some of the sampling sites (e.g. organic pollution and river bed modification) might have triggered the disappearance of both species from the areas of the water sheds situated downstream villages and towns, deforestation sites and sewage treatment plants. The analysis suggest that both species might have similar ecologic requirements, with a BMWP score of 8 (out of a possible 10), therefore good indicators of pristine aquatic environments and with a possible toleration to pollution but only up to a moderate level. Nevertheless, the lack of cohabitation of the populations of both species at a local scale was discussed along with two possible explaining hypotheses: behavioral exclusion or different times and/or modalities of dispersal history. RÉSUMÉ L'évaluation de l'habitat et des exigences de qualité de l'eau de l'écrevisse des torrents (Austropotamobius torrentium) et de l'écrevisse à pieds rouges (Astacus astacus) dans les rivières des montagnes d'Anina (sud-ouest de la Roumanie) Mots-clés : Astacus astacus,Austropotamobius torrentium et Astacus astacus sont deux espèces de l'UE reconnues comme nécessitant une meilleure compréhension de leurs besoins autécologiques avant qu'aucun effort de conservation durable puisse être appliqué avec succès. Par conséquent, l'article vise à analyser la présence de ces Article published by EDP Sciences L. Pârvulescu et al.: Knowl. Managt. Aquatic Ecosyst. (2011) 401, 03 Austropotamobius torrentium, écrevisses, distribution deux espèces d'écrevisses dans les montagnes d'Anina (Roumanie) par rapport à plusieurs indicateurs physico-chimiques mesurés sur les sites. Les résultats suggèrent que les impacts anthropiques enregistrés dans certains des sites d'échan-tillonnage ont pu influencer la disparition de ces deux espèces. Elles présentent des exigences écologiques similaires, ce qui suggère que l'espèce A. astacus est plus résistante à la pollution organique que A. torrentium. Néanmoins, l'absence de cohabitation des populations de ces deux espèces est également discutée.
Multifaceted implications of the competition between native and invasive crayfish: a glimmer of hope for the native's long-term survival-Manuscript Draft-Manuscript Number: BINV-D-18-00491R1 Full Title: Multifaceted implications of the competition between native and invasive crayfish: a glimmer of hope for the native's long-term survival Article Type: Research paper
Whereas the response of lotic benthic macroinvertebrates to different environmental stressors is a widespread practice nowadays in assessing the water and habitat quality, the use of hyporheic zone invertebrates is still in its infancy. In this study, classification and regression trees analysis were employed in order to assess the ecological requirements and the potential as bioindicators for the hyporheic zone invertebrates inhabiting four lowland chalk rivers (south England) with contrasting eutrophication levels (based on surface nitrate concentrations) and magnitude of land use (based on percentage of fine sediments load and median interstitial space). Samples of fauna, water and sediment were sampled twice, during low (summer) and high (winter) groundwater level, at depths of 20 and 35 cm. Certain groups of invertebrates (Glossosomatidae and Psychomyiidae caddisflies, and riffle beetles) proved to be good indicators of rural catchments, moderately eutrophic and with high fine sediment load. A diverse community dominated by microcrustaceans (copepods and ostracods) were found as good indicators of highly eutrophic urban streams, with moderate-high fine sediment load. However, the use of other taxonomic groups (e.g. chironomids, oligochaetes, nematodes, water mites and the amphipod Gammarus pulex), very widespread in the hyporheic zone of all sampled rivers, is of limited use because of their high tolerance to the analysed stressors. We recommend the use of certain taxonomic groups (comprising both meiofauna and macroinvertebrates) dwelling in the chalk hyporheic zone as indicators of eutrophication and colmation and, along with routine benthic sampling protocols, for a more comprehensive water and habitat quality assessment of chalk rivers.
To better understand the potential of drug repurposing in COVID-19, we analyzed control strategies over essential host factors for SARS-CoV-2 infection. We constructed comprehensive directed protein–protein interaction (PPI) networks integrating the top-ranked host factors, the drug target proteins and directed PPI data. We analyzed the networks to identify drug targets and combinations thereof that offer efficient control over the host factors. We validated our findings against clinical studies data and bioinformatics studies. Our method offers a new insight into the molecular details of the disease and into potentially new therapy targets for it. Our approach for drug repurposing is significant beyond COVID-19 and may be applied also to other diseases.
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