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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Borovikova E. A., Kodukhova J. V., Semenova A. V.
Заглавие : Phenotypic Plasticity and Allometry of Craniological Characters of Anadromous and Lacustrine Forms of Whitefish Coregonus lavaretus (Linnaeus, 1758) as an Indication of the Wrong Species Status of Coregonus pidschian
Место публикации : Contemp. Probl. Ecol.: Pleiades journals, 2020. - Vol. 13, Is. 6. - С. 620-630. - ISSN 19954255 (ISSN), DOI 10.1134/S1995425520060049
Аннотация: Abstract—: The variability of craniological characters has been studied for anadromous and lacustrine forms of whitefish Coregonus lavaretus (Linnaeus, 1758) from waterbodies of the Karelian coast of the White Sea. The significant phenotypic plasticity of craniological characters of the whitefish depends on the environmental conditions. Moreover, there is a correlation between indexes of the craniological traits (except for the index of the snout length) and the body and/or head length (allometric effect). These results suggest that it is unreasonable to separate anadromous and lacustrine forms of C. lavaretus as distinct taxonomical units and argues for the invalidity of C. pidschian and C. oxyrinchus species. © 2020, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makhutova O.N., Sushchik N.N., Gladyshev M.I., Ageev A.V., Pryanichnikova E.G., Kalachova G.S.
Заглавие : Is the fatty acid composition of freshwater zoobenthic invertebrates controlled by phylogenetic or trophic factors?
Место публикации : Lipids. - 2011. - Vol. 46, Is. 8. - С. 709-721. - ISSN 00244201 (ISSN) , DOI 10.1007/s11745-011-3566-9
Ключевые слова (''Своб.индексиров.''): benthic invertebrates--feeding strategy--fish--phylogeny--polyunsaturated fatty acids--arachidonic acid--docosahexaenoic acid--icosapentaenoic acid--article--controlled study--dendrocoelopsis--eulimnogammarus viridis--fatty acid analysis--feeding behavior--freshwater fish--habitat--lipid composition--nonhuman--nutritional value--phylogeny--species differentiation--taxonomy--animals--environment--fatty acids--fresh water--humans--invertebrates--phylogeny--ara--crustacea--dendrocoelopsis--eulimnogammarus viridis--invertebrata--turbellaria
Аннотация: We studied the fatty acid (FA) content and composition of ten zoobenthic species of several taxonomic groups from different freshwater bodies. Special attention was paid to essential polyunsaturated fatty acids, eicosapentaenoic acid (EPA, 20:5n-3), docosahexaenoic acid (DHA, 22:6n-3), and arachidonic acid (ARA, 20:4n-6); and the n-3/n-6 and DHA/ARA ratios, which are important for consumers of higher trophic levels, i.e., fish. The content and ratios of these FA varied significantly in the studied zoobenthic species, consequently, the invertebrates were of different nutritional quality for fish. Eulimnogammarus viridis (Crustacea) and Dendrocoelopsis sp. (Turbellaria) had the highest nutrition value for fish concerning the content of EPA and DHA and n-3/n-6 and DHA/ARA ratios. Using canonical correspondence analysis we compared the FA profiles of species of the studied taxa taking into account their feeding strategies and habitats. We gained evidence that feeding strategy is of importance to determine fatty acid profiles of zoobenthic species. However, the phylogenetic position of the zoobenthic species is also responsible and may result in a similar fatty acid composition even if species or populations inhabit different water bodies or have different feeding strategies. В© 2011 AOCS.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Semenchenko V.P., Dubovskaya O.P., Fefilova E.B., Makhutova O.N., Buseva Z.F., Sushchik N.N., Razlutskij V.I., Lepskaya E.V., Baturina M.A., Kalachova G.S., Kononova O.N.
Заглавие : Effect of temperature on contents of essential highly unsaturated fatty acids in freshwater zooplankton
Место публикации : Limnologica. - 2011. - Vol. 41, Is. 4. - С. 339-347. - ISSN 00759511 (ISSN) , DOI 10.1016/j.limno.2011.03.001
Ключевые слова (''Своб.индексиров.''): cladocerans--copepods--essential polyunsaturated fatty acids--freshwater zooplankton--water temperature--biomass--climate effect--community structure--fatty acid--freshwater ecosystem--gas chromatography--lake ecosystem--multivariate analysis--seston--taxonomy--temperature effect--trophic level--zooplankton--animalia--copepoda--crustacea
Аннотация: In 11 lakes from cold and warm regions we studied the content of highly unsaturated fatty acids (HUFA) in seston (130?m) and crustacean zooplankton using gas chromatography-mass spectrometry. An increase of temperature correlated with a decrease of HUFA content in zooplankton. A multivariate canonical correlation analyses revealed, that the decrease of HUFA content was related with a decrease of per cent of copepods in zooplankton communities, which are known to have higher HUFA levels in their biomass, than cladocerans. This means that temperature primarily affected the HUFA levels indirectly, via changing of taxonomic structure of zooplankton community, while the homeoviscous adaptation of zooplankton individuals had comparatively lower importance. As found, water temperature was better predictor of HUFA contents of zooplankton, than the fatty acid composition of seston. Thus, it can be predicted, that a probable climate warming will decrease the content of the essential HUFA in freshwater zooplankton with possible negative consequences for animals of higher trophic levels. В© 2011 Elsevier GmbH.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Sushchik N.N., Makhutova O.N., Dubovskaya O.P., Kravchuk E.S., Kalachova G.S., Khromechek E.B.
Заглавие : Correlations between fatty acid composition of seston and zooplankton and effects of environmental parameters in a eutrophic Siberian reservoir
Место публикации : Limnologica. - 2010. - Vol. 40, Is. 4. - С. 343-357. - ISSN 00759511 (ISSN) , DOI 10.1016/j.limno.2009.12.004
Ключевые слова (''Своб.индексиров.''): eicosapentaenoic acid--fatty acids--phytoplankton--temperature--zooplankton--canonical analysis--correlation--eutrophic environment--fatty acid--multivariate analysis--phytoplankton--seasonal variation--seston--taxonomy--temperature effect--water temperature--zooplankton--algae--bacillariophyta--ciliophora--cyanobacteria--cyclopoida--rotifera
Аннотация: During two sampling seasons we analyzed on weekly basis fatty acid (FA) composition of seston fraction 130?m and zooplankton fraction 130?m, and compared them using a multivariate canonical correlation analysis (CCA). Besides, we evaluated a possible impact of water temperature and inorganic nutrients on FA composition of the seston and the zooplankton.In spite of significant differences in percentages of several individual FAs, we found very strong canonical correlation (cross-correlation, 1-week lag) between FA composition of the seston and the zooplankton. The most important factor, providing the overall canonical cross-correlation between FA profiles of the seston and the zooplankton fractions was eicosapentaenoic acid (20:5?3, EPA). FA composition of the zooplankton fraction had comparatively poor correlations with taxonomic composition of the zooplankton. Thus, seasonal variations of FA composition of the zooplankton were determined primarily by seasonal changes in FA composition of the seston, rather than by taxonomic differences of FA profiles between rotifers, cyclopoids and cladocerans. FA composition of the seston was strongly affected by its taxonomic composition, namely by that of phytoplankton. According to CCA, the highest factor loadings pertained to diatoms interacting with their marker acids, including EPA, and cyanobacteria and greens, interacting with their marker acids. Ciliates and small rotifers composed considerable and sometimes major part of the seston biomass, but according to CCA their contributions to seasonal variations of the total FA profile of the seston were insignificant. This finding indirectly support the conclusion of the other authors, that the main source of FAs presented in ciliates and rotifers must be sought in algae and that they do not modify FA composition of food consumed, apart from repackaging it.Water temperature was the principal environmental parameter which drove the overall variations of FA composition. Factor loadings for the inorganic nutrients were comparatively negligible. The main contribution in the seasonal variation of FA composition of the seston was given by negative interaction between water temperature and percentage of EPA in the seston. В© 2009 Elsevier GmbH.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rota E..., Zalesskaja N.T., Rodionova N.S., Petushkov V.N.
Заглавие : Redescription of Fridericia heliota (Annelida, Clitellata : Enchytraeidae), a luminous worm from the Siberian taiga, with a review of bioluminescence in the Oligochaeta
Колич.характеристики :9 с
Место публикации : J. Zool.: CAMBRIDGE UNIV PRESS, 2003. - Vol. 260. - P291-299. - ISSN 0952-8369, DOI 10.1017/S0952836903003777
Примечания : Cited References: 45
Предметные рубрики: EARTHWORM BIOLUMINESCENCE
SIMILARITIES
Ключевые слова (''Своб.индексиров.''): fridericia heliota--taxonomy--siberian taiga--bioluminescence--enchytraeidae
Аннотация: The Siberian enchytraeid Fridericia heliota Zalesskaja, 1990 has so far been known only through a paper in Russian briefly describing its luminescence and the major external and internal morphological features. The present study expands that preliminary description, amending it as regards the chaetal formula, the clitellar pattern, the form of the nephridia and the occurrence of glands at the spermathecal orifices, and providing a more comprehensive taxonomic characterization of the species. More detailed information is also given on its habitat and geographical range as well as on its unusual luminous properties. In F heliota, the production of light is confined to the body wall with a pattern corresponding to that of the epidermal gland cells, although it does not involve discharge of luminous mucus. This contrasts with observations on other enchytraeids and on the oligochaetes in general. Records of luminosity in the Oligochaeta are reviewed with comments.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rota E., Zalesskaja N.T., Rodionova N.S., Petushkov V.N.
Заглавие : Redescription of Fridericia heliota (Annelida, Clitellata: Enchytraeidae), a luminous worm from the Siberian taiga, with a review of bioluminescence in the Oligochaeta
Место публикации : Journal of Zoology. - 2003. - Vol. 260, Is. 3. - С. 291-299. - ISSN 09528369 (ISSN) , DOI 10.1017/S0952836903003777
Ключевые слова (''Своб.индексиров.''): bioluminescence--enchytraeidae--fridericia heliota--siberian taiga--taxonomy--annelid--bioluminescence--ecomorphology--taxonomy--russian federation--annelida--clitellata--enchytraeidae--hirudinea--invertebrata--oligochaeta (metazoa)
Аннотация: The Siberian enchytraeid Fridericia heliota Zalesskaja, 1990 has so far been known only through a paper in Russian briefly describing its luminescence and the major external and internal morphological features. The present study expands that preliminary description, amending it as regards the chaetal formula, the clitellar pattern, the form of the nephridia and the occurrence of glands at the spermathecal orifices, and providing a more comprehensive taxonomic characterization of the species. More detailed information is also given on its habitat and geographical range as well as on its unusual luminous properties. In F. heliota, the production of light is confined to the body wall with a pattern corresponding to that of the epidermal gland cells, although it does not involve discharge of luminous mucus. This contrasts with observations on other enchytraeids and on the oligochaetes in general. Records of luminosity in the Oligochaeta are reviewed with comments.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Trusova M.Y., Gladyshev M.I.
Заглавие : Phylogenetic diversity of winter bacterioplankton of eutrophic Siberian reservoirs as revealed by 16S rRNA gene sequences
Колич.характеристики :8 с
Место публикации : Microb. Ecol.: SPRINGER-VERLAG, 2002. - Vol. 44, Is. 3. - P252-259. - ISSN 0095-3628, DOI 10.1007/s00248-002-2020-1
Примечания : Cited References: 34
Предметные рубрики: RIBOSOMAL-RNA ANALYSIS
COMMUNITY COMPOSITION
BACTERIAL DIVERSITY
LAKE
IDENTIFICATION
BIODIVERSITY
CULTIVATION
TAXONOMY
DYNAMICS
RIVER
Аннотация: Using 16S rRNA gene sequence analyses we investigated the bacterial diversity of winter bacterioplankton of two eutrophic Siberian reservoirs. These reservoirs show similarity in phytoplankton community composition in spring and autumn but tend to differ in summer in exhibiting cyanobacterial bloom. Forty-eight unique partial 16S RNA gene sequences retrieved from two libraries were mostly affiliated with the class Actinobacteria, beta subdivision of the class Proteobacteria, and the phylum Cytophaga-Flavobacterium-Bacteroides The clone library of the pond exhibiting summer cyanobacterial bloom showed more diversity in sequence composition. A significant number of bacterial 16S rRNA gene clones were closely related to freshwater bacteria previously found in different aquatic ecosystems. This finding confirms the assumption that some bacterial clades are globally distributed.
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