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A one-dimensional model for phytoflagellate distribution in the meromictic lake [Text] / I. G. Prokopkin, Y. V. Barkhatov, E. B. Khromechek // Ecol. Model. - 2014. - Vol. 288. - P. 1-8, DOI 10.1016/j.ecolmode1.2014.05.011. - Cited References: 22. - This work was supported by Russian Foundation for Basic Research (RFBR) No. 13-04-01514 and Integrative Project of Siberian Branch of Russian Academy of Sciences No. 56. The anonymous reviewers are kindly acknowledged for valuable suggestions and criticism. . - ISSN 0304-3800. - ISSN 1872-7026

РУБ Ecology
Рубрики:
VERTICAL-DISTRIBUTION
   CHLOROPHYLL MAXIMUM
   SOUTH SIBERIA
   RUSSIA
   KHAKASIA
   SHIRA
   CRYPTOPHYTES
   CRYPTOMONAS
   CHEMOCLINE
   MIGRATION
Кл.слова (ненормированные):
Phytoflagellates -- Meromictic lake -- Simulation modeling -- Lake Shira
Аннотация: Using mathematical modeling methods, the work investigates possible existence of a phytoflagellate population in the ecosystem of a stratified lake (Lake Shira, Khakasia, Russia). Until this study was carried out, no phytoflagellate population had been detected in the lake, although there had been indirect evidence of the possible presence of a cryptomonad population in this water body. To answer the question if this population may be present in this water body, as the first step of investigation, a mathematical model was developed describing the microorganism biomass dynamics and phytoflagellate relationship with the lake food web. The calculations showed that cryptophytic algae were abundant in the water column layers above the lake chemocline at the beginning of summer but showed low biomass concentrations during other periods of time. In the summer following the construction of the model, samples were collected from Lake Shira, as the next step of the study. A cryptophytic algae population was found in the water column, and the pattern of its distribution in the ecosystem was similar to that predicted by the model. In addition to that, we studied theoretically possible reasons for the early summer development of the population in the deep water layers and found that it was the result of the mixotrophic feeding strategy of cryptomonads and trophic interactions in the food web. The study shows that preliminary modeling of the locational and temporal distribution of populations whose presence in the ecosystem is only suggested by indirect evidence may be useful as a tool for searching for the species in natural ecosystems and as an approach enabling a more accurate description of the food web structure of a water body. (C) 2014 Elsevier B.V. All rights reserved.

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Держатели документа:
[Prokopkin, I. G.
Barkhatov, Y. V.
Khromechek, E. B.] Akademgorodok, Inst Biophys, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Prokopkin, I.G.; Barkhatov, Y.V.; Khromechek, E.B.; Russian Foundation for Basic Research (RFBR) [13-04-01514]; Integrative Project of Siberian Branch of Russian Academy of Sciences [56]

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An in situ method for the investigation of vertical distributions of zooplankton in lakes: test of a two-compartment enclosure [Text] / A. P. Tolomeyev, Y. S. Zadereev // Aquat. Ecol. - 2005. - Vol. 39, Is. 2. - P. 181-188, DOI 10.1007/s10452-004-5732-0. - Cited References: 21 . - ISSN 1386-2588

РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
MIGRATION
   DAPHNIA
   RADIATION
   COPEPODS
   EXPOSURE
   PATTERNS
   LIGHT
Кл.слова (ненормированные):
anoxic hypolimnion -- solar radiation -- stratified lake -- vertical migration -- zooplankton
Аннотация: Two-section enclosures were designed for the investigation of the effect of various physicochemical and biological factors on vertical distribution of zooplankton in situ. The framework of the enclosure was a cylindrical polyethylene column without any partitions inside, in which the isolation of animals in different sections after in situ exposure was achieved by pinching the flexible central part of the column. Enclosures were tested at the brackish stratified meromictic Lake Shira (Russia, Khakasia). The absence of fish and carnivorous zooplankton in the lake suggests that the vertical distribution of zooplankton is mainly determined by physicochemical gradients in the water column. Experiments and field observations demonstrated that all age and size groups of Arctodiaptomus salinus and Brachionus plicatilis strongly avoided surface layers during the daylight. The escape of zooplankton from the anoxic hypolimnion was less active. Statistically significant avoidance was observed only for copepodites C4-C5 and females of A. salinus. The relatively simple construction of the columns and easy handling during the experiment were the factors that favoured the use of this device to perform in situ basic tests of the effect of different factors on the vertical distribution of zooplankton.

WOS
Держатели документа:
SB RAS, Inst Biophys, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Tolomeyev, A.P.; Zadereev, Y.S.

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Ecological Forms of Black Sea Brown Trout (Salmo trutta labrax) in the Mzymta River as Manifestation of Ontogenetic Plasticity / A. A. Makhrov [et al.] // Russ. J. Dev. Biol. - 2018. - Vol. 49, Is. 2. - P117-127, DOI 10.1134/S1062360418020054. - Cited References:77. - This study was supported by the Russian Scientific Foundation, project no. 16-14-10001. . - ISSN 1062-3604. - ISSN 1608-3326

РУБ Developmental Biology
Рубрики:
ATLANTIC SALMON
   POPULATIONS
   HISTORY
   L.
   MIGRATION
   SURVIVAL
Кл.слова (ненормированные):
Salmonidae -- brown trout -- trout -- ontogenesis -- migrations -- maturation -- phenotypic plasticity -- gonads -- smolts
Аннотация: Populations of brown trout in the Mzymta River and its tributaries include anadromous (mainly female) and resident (mainly males) fish. Some resident males in the basin of the Mzymty River attain sexual maturity at the age 1+, and resident females mature at the age 2+ or 3+. The maximum age of resident fish is 4+ in the samples studied. Migrations of anadromous brown trout to the sea occur at the ages 1+, 2+, or 3+. Future spawners spend from 1 to 4 years at feeding grounds in the sea. Smolts of the population are characterized by performing not only spring but also autumn migrations to the sea. One smolt specimen has been detected upstream from the dam in the river where spawners of anadromous brown trout do not migrate; this means that the capability for sea migrations persists long in the population represented only by resident specimens of brown trout. The diversity of life cycles and ecological forms in populations of brown trout is not lower than in populations of brown trout in Northern and Western Europe. The comparison of the data obtained with published data makes it possible to come to the conclusion about the high plasticity of ontogenesis of Black Sea brown trout.

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Держатели документа:
Russian Acad Sci, Severtsov Inst Ecol & Evolut, Moscow 119071, Russia.
Russian Acad Sci, Fed Res Ctr Krasnoyarsk Sci Ctr, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia.
St Petersburg State Univ, St Petersburg 199034, Russia.
Azov Res Inst Fisheries, Krasnodar Branch, Krasnodar 350000, Russia.
Moscow MV Lomonosov State Univ, Moscow 119991, Russia.
Kuban State Univ, Krasnodar 350040, Russia.

Доп.точки доступа:
Makhrov, A. A.; Artamonova, V. S.; Murza, I. G.; Pashkov, A. N.; Ponomareva, M. V.; Reshetnikov, S. I.; Christoforov, O. L.; Russian Scientific Foundation [16-14-10001]

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