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40 records – page 1 of 4.

[Chromosomal variability in natural populations of Chironomus cingulatus Meigen (Diptera, Chironomidae)]

https://arctichealth.org/en/permalink/ahliterature89315
Source
Tsitologiia. 2009;51(2):138-48
Publication Type
Article
Date
2009
Author
Istomina A G
Kiknadze I I
Gunderina L I
Source
Tsitologiia. 2009;51(2):138-48
Date
2009
Language
Russian
Publication Type
Article
Keywords
Animals
Chironomidae - genetics
Chromosome Mapping
Chromosomes - genetics
Europe
Karyotyping
Larva - genetics
Polymorphism, Genetic
Siberia
Abstract
Chromosomal polymorphism has been investigated in 7 natural populations from West Europe, West Siberia and Sakha Republic (Yakutia). The pool of polytene chromosome banding sequences of this species includes 15 banding sequences. The chromosomal polymorphism has been revealed in 5 of chromosomal arms. The most polymorphic is the arm B, there are 4 banding sequences in it. There are 3 banding sequences in the arm A. The arms D, E and G have 2 banding sequences. No chromosome rearrangements have been found in the arms C and F. The populations of Chironomus cingulatus differ clearly in the number and frequencies of banding sequences. This is evidence of that different gene sequences are adaptive in different populations.
PubMed ID
19371021 View in PubMed
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[Chromosomal variation in Chironomus plumosus L. (Diptera, Chironomidae) from populations of Bryansk region, Saratov region (Russia), and Gomel region (Belarus)].

https://arctichealth.org/en/permalink/ahliterature263710
Source
Genetika. 2015 Feb;51(2):166-76
Publication Type
Article
Date
Feb-2015
Author
S I Belyanina
Source
Genetika. 2015 Feb;51(2):166-76
Date
Feb-2015
Language
Russian
Publication Type
Article
Keywords
Animals
Chironomidae - cytology - genetics
Chromosomes - genetics
Genetics, Population
Heterozygote
Karyotype
Polymorphism, Genetic
Republic of Belarus
Russia
Abstract
Cytogenetic analysis was performed on samples of Chironomus plumosus L. (Diptera, Chironomidae) taken from waterbodies of various types in Bryansk region (Russia) and Gomel region (Belarus). Karyotypes of specimens taken from stream pools of the Volga were used as reference samples. The populations of Bryansk and Gomel regions (except for a population of Lake Strativa in Starodubskii district, Bryansk region) exhibit broad structural variation, including somatic mosaicism for morphotypes of the salivary gland chromosome set, decondensation of telomeric sites, and the presence of small structural changes, as opposed to populations of Saratov region. As compared with Saratov and Bryansk regions, the Balbiani ring in the B-arm of chromosome I is repressed in populations of Gomel region. It is concluded that the chromosome set of Ch. plumosus in a range of waterbodies of Bryansk and Gomel regions is unstable.
PubMed ID
25966582 View in PubMed
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Cladotanytarsus saetheri sp. nov. and C. gedanicus Gilka: Holarctic sibling species (Diptera: Chironomidae).

https://arctichealth.org/en/permalink/ahliterature292062
Source
Zootaxa. 2018 Mar 14; 4394(3):428-436
Publication Type
Journal Article
Date
Mar-14-2018
Author
Mateusz Puchalski
Lauri Paasivirta
Wojciech GiLka
Author Affiliation
University of Gdansk, Faculty of Biology, Department of Invertebrate Zoology and Parasitology, Laboratory of Systematic Zoology; Wita Stwosza 59, 80-308 Gdansk, Poland. user@example.com.
Source
Zootaxa. 2018 Mar 14; 4394(3):428-436
Date
Mar-14-2018
Language
English
Publication Type
Journal Article
Keywords
Animals
Canada
Chironomidae
Colorado
Diptera
Far East
Male
Manitoba
New Mexico
Russia
South Carolina
Wisconsin
Abstract
Cladotanytarsus saetheri, sp. nov., a widely distributed species (Fennoscandia; Russia: Far East; Canada: Manitoba; USA: Colorado, Michigan, South Carolina, Wisconsin) is described and compared with C. gedanicus Gilka, 2001 on the basis of new records (Fennoscandia; Canada: Manitoba, Nunavut; USA: Colorado, New Mexico). Intraspecific morphological variability of adult males is presented in order to delimit the two previously misidentified species.
PubMed ID
29690363 View in PubMed
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A comparison of contaminant dynamics in arctic and temperate fish: A modeling approach.

https://arctichealth.org/en/permalink/ahliterature83098
Source
Chemosphere. 2006 May;63(8):1328-41
Publication Type
Article
Date
May-2006
Author
Gewurtz Sarah B
Laposa Rebecca
Gandhi Nilima
Christensen Guttorm N
Evenset Anita
Gregor Dennis
Diamond Miriam L
Author Affiliation
Department of Geography, University of Toronto, 100 St. George Street, Toronto, ON, Canada M5S 3G3.
Source
Chemosphere. 2006 May;63(8):1328-41
Date
May-2006
Language
English
Publication Type
Article
Keywords
Animals
Chironomidae - chemistry
Climate
Diet
Environmental monitoring
Feces - chemistry
Gills - metabolism
Models, Theoretical
Norway
Ontario
Polychlorinated Biphenyls - analysis - metabolism
Trout - metabolism
Water Pollutants, Chemical - analysis - metabolism
Zooplankton - chemistry
Abstract
In order to compare the abilities of arctic and temperate fish to accumulate PCBs we conduct a metabolic analysis to determine how process rates in a mathematical fish contaminant model change with temperature. We evaluate the model by applying the original and adapted models to estimate PCB concentrations in lake trout (Salvelinus namaycush) in Trout Lake, Ontario, Canada, and in arctic char (Salvelinus alphinus) in Lake Øyangen, in the Norwegian high arctic. Modeled concentrations are, for the most part, within 50% of mean measured values and are comparable to the error associated with the fish data. In order to evaluate differences in fish bioaccumulation processes, the model is applied to hypothetical arctic and temperate systems, assuming the same contaminant input values in water and diet. The model predicts that temperate salmonids are able to biomagnify PCBs 6-60% more than arctic salmonids. For all congeners, the lower BMF(MAX) of arctic fish contribute to their lower concentrations. For congeners with log K(ow) 7.0. These processes are controlled by the influence of lipid in the fish and their diet as well as the dependence of growth on temperature. We suggest that fish models originally calibrated for temperate systems may be directly applied to arctic lakes after accounting for the lipid content of the fish and their diet as well as water temperature.
PubMed ID
16293292 View in PubMed
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A decision framework for possible remediation of contaminated sediments in the River Kymijoki, Finland.

https://arctichealth.org/en/permalink/ahliterature154615
Source
Environ Sci Pollut Res Int. 2009 Jan;16(1):95-105
Publication Type
Article
Date
Jan-2009
Author
Matti Verta
Hannu Kiviranta
Simo Salo
Olli Malve
Markku Korhonen
Pia K Verkasalo
Päivi Ruokojärvi
Esko Rossi
Ari Hanski
Kare Päätalo
Terttu Vartiainen
Author Affiliation
Finnish Environment Institute (SYKE), P.O. Box 140, 00251, Helsinki, Finland. matti.verta@ymparisto.fi
Source
Environ Sci Pollut Res Int. 2009 Jan;16(1):95-105
Date
Jan-2009
Language
English
Publication Type
Article
Keywords
Animals
Chironomidae - drug effects
Decision Support Techniques
Ecosystem
Environmental Exposure
Environmental Remediation - methods
Female
Finland
Geologic Sediments - chemistry
Humans
Lipids - blood
Milk, human - chemistry
Public Health
Risk factors
Rivers - chemistry
Water Pollutants, Chemical - chemistry - toxicity
Abstract
The paper describes the spatial contamination of the River Kymijoki, South-Eastern Finland, and the coastal region of the Gulf of Finland with PCDD/Fs and mercury. The findings of ecotoxicologial and human health studies are also reported, including environmental and human risk assessments. Sediments from the River Kymijoki, draining into the Gulf of Finland, have been heavily polluted by the pulp and paper industry and by chemical industries. A wood preservative, known as Ky-5, was manufactured in the upper reaches of the river between 1940 and 1984 causing severe pollution of river sediments with polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF). Moreover, the sediments have been polluted with mercury (Hg) from chlor-alkali production and the use of Hg as a slimicide in pulp and paper manufacturing.
An extensive sediment survey was conducted as well as sediment transport modeling, toxicity screening of sediment invertebrates, and a survey of contaminant bioaccumulation in invertebrates and fish. Studies on human exposure to PCDD/Fs and the possible effects on hypermineralization of teeth as well as an epidemiological study to reveal increased cancer risk were also conducted. An assessment of the ecological and human health risks with a null hypothesis (no remediation) was undertaken.
The sediment survey revealed severe contamination of river and coastal sediments with PCDD/Fs and Hg. The total volume of contaminated sediments was estimated to reach 5x10(6) m3 and hot spots with extremely high concentrations (max 292,000 ng g(-1) or 1,060 ng I-TEQ g(-1) d.w.) were located immediately downstream from the pollution source (approximately 90,000 m3). Sediment contamination was accompanied by changes in benthic assemblages, but direct effects were masked by many factors. The fish showed only slightly elevated PCDD/F levels in muscle, but orders of magnitude higher in the liver compared with reference freshwater sites and the Baltic Sea. The concentrations in human fat did not reveal high human exposure in the Kymijoki area in general and was lower than in sea fishermen. The relative risk for total cancer among farmers was marginally higher (RR=1.13) among those living close to the river, compared with farmers living further away, and the possibility of increased cancer risk cannot be ruled out. A conservative risk assessment revealed that the present probability of exceeding the WHO upper exposure limit of 4 pg WHO-TEQ kg(-1) d(-1) for PCDD/Fs and DL-PCBs was 6%. The probability of exceeding the WHO limit value of 0.23 mug kg(-1) d(-1) for methyl mercury was estimated to be notably higher at 62%. Based on these studies and the estimated risks connected with different remediation techniques a general remediation plan with cost benefit analysis was generated for several sub-regions in the river. Dredging, on-site treatment, and a close disposal of the most contaminated sediments (90,000 m3) was suggested as the first phase of the remediation. The decision regarding the start of remediation will be made during autumn 2008.
The sediments in the River Kymijoki are heavily polluted with PCDD/Fs and mercury from earlier chlorophenol, chlor-alkali, and pulp and paper manufacturing. A continuous transport of contaminants is taking place to the Gulf of Finland in the Baltic Sea. The highly increased PCDD/F and Hg levels in river sediments pose an ecotoxicological risk to benthic fauna, to fish-eating predators and probably to human health. The risks posed by mercury exceed those from PCDD/Fs and need to be evaluated for (former) chlor-alkali sites and other mercury releasing industries as one basis for remediation decision making.
The studies form the basis of a risk management strategy and a plan for possible remediation of contaminated sediments currently under consideration in the Southeast Finland Regional Environment Centre. It is recommended that a detailed restoration plan for the most seriously contaminated areas should be undertaken. Based on current knowledge, the restoration of the whole river is not feasible, considering the current risk caused by the contaminated sediment in the river and the costs of an extensive restoration project. The experiences gained in the present case should be utilized in the evaluation of PCDD/F- and mercury-contaminated sites in other countries. The case demonstrates that the historic reservoirs are of contemporary relevance and should be addressed, e.g., in the national implementation plans of the Stockholm Convention.
PubMed ID
18941816 View in PubMed
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Description of the adult and larva of Clunio balticus Heimbach, 1978 (Diptera, Chironomidae) from the seashore of Bergen (Norway).

https://arctichealth.org/en/permalink/ahliterature304569
Source
Zootaxa. 2020 Aug 05; 4822(2):zootaxa.4822.2.4
Publication Type
Journal Article
Date
Aug-05-2020
Author
Joel Moubayed-Breil
P Michailova
Author Affiliation
Freshwater Marine biology, 10 rue des Fenouils, F-34070 Montpellier, France. joelmb34@free.fr.
Source
Zootaxa. 2020 Aug 05; 4822(2):zootaxa.4822.2.4
Date
Aug-05-2020
Language
English
Publication Type
Journal Article
Keywords
Animals
Chironomidae
Female
Larva
Male
Norway
Abstract
The male and female adult and larva of Clunio balticus Heimbach, 1978 are diagnosed and described based on reared material, which was collected in the marine littoral zone along the coast of Bergen (Norway). Male and female adults and larvae of C. balticus can be easily distinguished from other known European Clunio species on the basis of some atypical features found in the male and female adults and fourth instar larvae. The biological cycle (reproduction and emergence) of C. balticus is a slight semilunar-periodic synchronization on days near the high tides. C. balticus is a local biogeographic representative of the northern Atlantic coast, which includes the eastern and western seashores. Remarks on related known Clunio species from Europe with comments on the ecology and geographical distribution of C. balticus are given.
PubMed ID
33056289 View in PubMed
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DNA barcode data reveal biogeographic trends in Arctic non-biting midges.

https://arctichealth.org/en/permalink/ahliterature298564
Source
Genome. 2018 Nov; 61(11):787-796
Publication Type
Journal Article
Date
Nov-2018
Author
Torbjørn Ekrem
Elisabeth Stur
Matthew G Orton
Sarah J Adamowicz
Author Affiliation
a Department of Natural History, NTNU University Museum, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Source
Genome. 2018 Nov; 61(11):787-796
Date
Nov-2018
Language
English
Publication Type
Journal Article
Keywords
Animals
Arctic Regions
Biodiversity
Chironomidae - classification - genetics
DNA Barcoding, Taxonomic
Female
Male
Phylogeography
Abstract
Chironomid flies (non-biting midges) are among the most abundant and diverse animals in Arctic regions, but detailed analyses of species distributions and biogeographical patterns are hampered by challenging taxonomy and reliance on morphology for species-level identification. Here we take advantage of available DNA barcode data of Arctic Chironomidae in BOLD to analyse similarities in species distributions across a northern Nearctic - West Palearctic gradient. Using more than 260?000 barcodes representing 4666 BINs (Barcode Index Numbers) and 826 named species (some with interim names) from a combination of public and novel data, we show that the Greenland chironomid fauna shows affinities to both the Nearctic and the West Palearctic regions. While raw taxon counts indicate a strong Greenland - North American affinity, comparisons using Chao's dissimilarity metric support a slightly higher similarity between Greenland and West Palearctic chironomid communities. Results were relatively consistent across different definitions of species taxonomic units, including morphologically determined species, BINs, and superBINs based on a ~4.5% threshold. While most taxa found in Greenland are shared with at least one other region, reflecting circum-Arctic dispersal, our results also reveal that Greenland harbours a small endemic biodiversity. Our exploratory study showcases how DNA barcoding efforts using standardized gene regions contribute to an understanding of broad-scale patterns in biogeography by enabling joint analysis of public DNA sequence data derived from diverse prior studies.
PubMed ID
30365909 View in PubMed
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[Effect of p-chloromercuribenzoic acid and dithiothreitol on the Ca(2+) content of salivary glands and their protein secretion]

https://arctichealth.org/en/permalink/ahliterature10163
Source
Fiziol Zh. 2001;47(3):35-41
Publication Type
Article
Date
2001
Author
N V Fedirko
V V Man'ko
M Iu Klevets'
Author Affiliation
Ivan Franko Nataional University of Lviv.
Source
Fiziol Zh. 2001;47(3):35-41
Date
2001
Language
Ukrainian
Publication Type
Article
Keywords
Animals
Ca(2+)-Transporting ATPase - metabolism
Calcium - metabolism
Chironomidae
Dithiothreitol - pharmacology
Dose-Response Relationship, Drug
English Abstract
Eosine Yellowish-(YS) - pharmacology
Homeostasis
In Vitro
Insect Proteins - drug effects - secretion
Salivary Glands - drug effects - metabolism - secretion
Sodium-Calcium Exchanger - drug effects - metabolism
Sulfhydryl Compounds - metabolism
Sulfhydryl Reagents - pharmacology
p-Chloromercuribenzoic Acid - pharmacology
Abstract
It has been shown, less concentrations of p-chlormercuribenzoate (1 and 2.5 mM) increased Ca2+ content in gland tissue and thereby protein secretion level that may occurred mainly by suppression Ca(2+)-pump or/and stimulation of Na(+)-Ca(2+)-exchange (both in cell plasma membrane) through modulation of SH-groups which form part of their molecules. Higher PCMB concentrations markedly decreased Ca2+ content in gland tissue as well as protein secretion. Effects of PCMB (5 and 10 mM), depending on the direction of Na(+)-Ca(2+)-exchange functioning (Ca(2+)-efflux or Ca(2+)-influx), were evoked or presumably by suppression of endoplasma reticulum Ca(2+)-pump (at conditions Na(+)-dependent Ca(2+)-efflux) or Na(+)-dependent Ca(2+)-influx into the cells that clearly confirmed when PCMB was added on the background of eosin Y (specific Ca(2+)-ATPase inhibitor). Possible role of potential dependent Ca(2+)-channnels in the mediating of PCMB effects is discussed. Introducing of dythiothreitol (DTT) increased Ca2+ content in glands and decreased secretion level obviously by protection of SH-groups of cell Ca(2+)-transporting systems and thereby diminished [Ca2+]i. Finally, we confirm important functional role of SH-groups in the regulation of Ca(2+)-homeostasis in secretory cells of exocrine glands.
PubMed ID
11519248 View in PubMed
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[Genetic Differentiation of Populations of Baikal Endemic Sergentia baicalensis Tshern. (Diptera, Chironomidae)].

https://arctichealth.org/en/permalink/ahliterature268179
Source
Genetika. 2015 Jul;51(7):826-9
Publication Type
Article
Date
Jul-2015
Author
L S Kravtsova
Yu S Bukin
T E Peretolchina
D Yu Shcherbakov
Source
Genetika. 2015 Jul;51(7):826-9
Date
Jul-2015
Language
Russian
Publication Type
Article
Keywords
Animals
Chironomidae - genetics
Electron Transport Complex IV - genetics
Genes, Mitochondrial
Genetic Speciation
Genetics, Population
Haplotypes
Siberia
Abstract
The population structure of endemic species Sergentia baicalensis (Diptera, Chironomidae) from Lake Baikal was studied using the first subunit of the cytochrome C oxidase mitochondrial gene (Col). Two populations inhabiting different basins of this lake, the southern-central and northern, were detected. It was confirmed that the divergence time of this species was dated to Late Miocene (9.53 ± 3.9 Mya), during the period when geographically separated basins existed in the Baikal rift zone.
PubMed ID
26410937 View in PubMed
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[Geographic differentiation of genomic DNA of Chironomus plumosus (Diptera, Chironomidae) in natural holarctic populations]

https://arctichealth.org/en/permalink/ahliterature89906
Source
Genetika. 2009 Jan;45(1):64-72
Publication Type
Article
Date
Jan-2009
Author
Gunderina L I
Kiknadze I I
Istomina A G
Batler M.
Source
Genetika. 2009 Jan;45(1):64-72
Date
Jan-2009
Language
Russian
Publication Type
Article
Keywords
Animals
Chironomidae - genetics
DNA - genetics
Europe
Genetics, Population
Genome, Insect
North America
Polymorphism, Genetic
Random Amplified Polymorphic DNA Technique
Siberia
Abstract
Using RAPD markers, polymorphism and differentiation of genomic DNA was examined in seven natural populations of Chironomus plumosus from Europe, Siberia, and North America. All these populations showed high polymorphism of genomic DNA. The Palearctic and Nearctic populations of this species were not statistically significantly different in the genomic DNA polymorphism level. The genetic distance (GD), which characterizes the extent of intraspecific differentiation of population genetic structure, was determined among the natural populations of C. plumosus. The genetic distance was on average 0.0245. It was demonstrated that genetic structures of the Palearctic and Nearctic populations of C. plumosus was differentiated to a higher extent than in Palearctic. However, the genetic distances between the populations from different zoogeographical zones (0.313) did not exceed the level characteristic of the among-population differences, which do not disturb the species genetic integrity.
PubMed ID
19239099 View in PubMed
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40 records – page 1 of 4.