Dependence of the duration of the embryonic period of development of the sevryuga (Acipenser stellatus Pallas, 1771) and the thorn (Acipenser nudiventris Lovetsky, 1828) on the temperature regime of wintering of producers

Fisheries ◽  
2021 ◽  
Vol 2021 (4) ◽  
pp. 68-75
Author(s):  
Eduard Vladimirovich Bubunets ◽  
Alexander Vladislavovich Labenets ◽  
Alexey Vasilevich Zhigin
Keyword(s):  
Temperature Regime ◽  
Natural Populations ◽  
Similar Data ◽  
Volga River ◽  
Embryonic Period ◽  
Temperature Conditions ◽  
Acipenser Nudiventris ◽  
Acipenser Stellatus

The temperature conditions and the results of wintering of producers, incubation of caviar of sevryuga and thorn in farms on waste warm waters are considered. The studied indicators are compared with similar data obtained when keeping producers from natural populations in the lower reaches of the Volga River. In the considered species, with a shortened and comfortable "warm" wintering (for sevryuga at 5-11, thorn – 3-15°C), an increase in the duration of incubation up to a day or more was recorded in comparison with individuals from natural populations. The temperature regulations of wintering for producers, incubation and maintenance of free embryos are proposed.

scholarly journals Patterns of thermal adaptation in a worldwide plant pathogen: local diversity and plasticity reveal two-tier dynamics

2019 ◽  
Author(s):  
Anne-Lise Boixel ◽  
Michaël Chelle ◽  
Frédéric Suffert
Keyword(s):  
Plant Pathogen ◽  
Natural Populations ◽  
Thermal Adaptation ◽  
Thermal Conditions ◽  
List Type ◽  
Zymoseptoria Tritici ◽  
Local Conditions ◽  
Temperature Conditions ◽  
Spatiotemporal Scales ◽  
Pathogen Populations

SummaryPlant pathogen populations inhabit patchy environments with contrasting, variable thermal conditions. We investigated the diversity of thermal responses in populations sampled over contrasting spatiotemporal scales, to improve our understanding of their dynamics of adaptation to local conditions.Samples of natural populations of the wheat pathogen Zymoseptoria tritici were collected from sites within the Euro-Mediterranean region subject to a broad range of environmental conditions. We tested for local adaptation, by accounting for the diversity of responses at the individual and population levels on the basis of key thermal performance curve parameters and ‘thermotype’ (groups of individuals with similar thermal responses) composition.The characterisation of phenotypic responses and genotypic structure revealed: (i) a high degree of individual plasticity and variation in sensitivity to temperature conditions across spatiotemporal scales and populations; (ii) geographic adaptation to local mean temperature conditions, with major alterations due to seasonal patterns over the wheat-growing season.The seasonal shifts in functional composition suggest that populations are locally structured by selection, contributing to shape adaptation patterns. Further studies combining selection experiments and modelling are required to determine how functional group selection drives population dynamics and adaptive potential in response to thermal heterogeneity.

scholarly journals Marking fin spine of juvenile sturgeon (acipenseriformes: acipenseridae) using oxytetracycline and the comparing of growth performance

2021 ◽  
Vol 73 (4) ◽  
pp. 902-908
Author(s):  
S. Bakhshalizadeh ◽  
A. Bani ◽  
S. Abdolmalaki ◽  
J.T. Ponce-Palafox
Keyword(s):  
Growth Parameter ◽  
First Year ◽  
Pectoral Fin ◽  
Persian Sturgeon ◽  
Acipenser Persicus ◽  
Juvenile Sturgeon ◽  
Acipenser Nudiventris ◽  
Acipenser Stellatus ◽  
Unbiased Estimates ◽  
Persian Sturgeon Acipenser Persicus

ABSTRACT This study aimed to describe and validate the formation of the rings in the spine of the pectoral fin and to determine the coherence of the OTC mark with the rings of three species of Caspian Sea sturgeon, the Persian sturgeon (Acipenser persicus), the Starry sturgeon (Acipenser stellatus) and Ship sturgeon (Acipenser nudiventris). Validation was achieved by comparing the total radius of the fin spine of fish of known age after one and two years of growth with the measured radius of the first and second rings in the zone. There was no overlap between the measured radius for the first year and the increase for the second. The Ship sturgeon showed the largest width of the second ring followed by the Persian sturgeon and Stellate sturgeon. The results indicate that the highest growth parameter belongs to the juvenile Ship sturgeon. This research showed that chemically marking the fin spines of juvenile Acipenseridae leads to unbiased estimates and contributes to the knowledge of the population dynamics of these species. The study found that the combination of the dial ring of the pectoral fin spine with growth validated the age estimation in juvenile sturgeon Ship, Persian, and Starry sturgeon.

scholarly journals Evaluation of genetic polymorphism of proteins in stellate sturgeon Acipenser stellatus (Pall) in aquaculture with reference to economically valuable traits

2021 ◽  
Vol 937 (3) ◽  
pp. 032033
Author(s):  
Elena Shishanova ◽  
Grigory Shishanov ◽  
Dmitry Isaev
Keyword(s):  
Genetic Polymorphism ◽  
Survival Rates ◽  
Natural Populations ◽  
Natural Environments ◽  
Economic Traits ◽  
Allelic Variants ◽  
Stellate Sturgeon ◽  
Size Growth ◽  
Economically Valuable Traits ◽  
Acipenser Stellatus

Abstract One of the main goals of sturgeon aquaculture is the restoration and renewal of wild populations of sturgeon fish in nature, which creates a tension between selective breeding with maintenance of valuable economic traits in a homozygous state and the need to conserve genetic diversity ensuring fitness in natural environments. It is generally assumed that important economic characteristics, such as body weight and size, growth rate, fecundity, etc., as well as fitness in fish, are associated with heterozygosity and genetic polymorphism of some key metabolic enzymes. It remains unclear whether aquaculture conditions can be as a whole selection factor in favor of certain allelic variants of these enzymes. To establish the relationship between some economic traits and enzymatic polymorphism, we studied the distribution of allelic variants of LDH-3, AAT-2, FGM, and Est enzymes in stellate sturgeon reared in aquaculture. We revealed a frequency bias of some allelic variants of the studied enzymes in a cohort of fish from the generation bred in aquaculture compared to the frequencies of those alleles in wild natural populations. Our study suggests that industrial breeding promotes selection in the direction of reducing size but increasing survival rates, which correlates with certain allelic variants.

The effects of wetting and drying on the subsequent germination of Rumex crispus

1978 ◽  
Vol 56 (18) ◽  
pp. 2207-2217 ◽  
Author(s):  
Elizabeth M. Vincent ◽  
Paul B. Cavers
Keyword(s):  
Constant Temperature ◽  
Temperature Regime ◽  
Continuous Darkness ◽  
Wetting And Drying ◽  
Rumex Crispus ◽  
Mannitol Solution ◽  
Temperature Conditions ◽  
Secondary Dormancy ◽  
Nearly Continuous

A period of 1 to 3 days imbibition followed by drying altered the subsequent germination responses of seeds of Rumex crispus L. When the imbibition took place under alternating light and temperature conditions subsequent germination was faster and more complete. In contrast, when the seeds imbibed at a constant temperature and in nearly continuous darkness subsequent germination was delayed and less complete. Subsidiary tests demonstrated that (a) within a 24-h drying period, the seeds lost virtually all water imbibed over 1 to 3 days; (b) a 3-day imbibition pretreatment was followed by faster, more complete germination in a 0.25 M mannitol solution; (c) the duration of the drying period (up to 29 days) had little effect on the outcome; and (d) seeds pretreated for 1 to 3 days under an alternating light and tempèrature regime germinated more rapidly than untreated seeds when sown in soil in a greenhouse. These results help to explain why seedlings of R. crispas appear rapidly each summer following a drought-ending downpour, whereas seeds of the same species buried deep in the soil acquire a secondary dormancy and may remain viable for up to 80 years.

scholarly journals New Phyto-Incubator with Temperature and Illumination Adjustment for Water Ecosystems’ Ecological Parameters Monitoring

2015 ◽  
Vol 4 (4) ◽  
pp. 3-9 ◽  
Author(s):  
Гонтарев ◽  
S. Gontarev ◽  
Мошаров ◽  
Sergey Mosharov ◽  
Корсак ◽  
...  
Keyword(s):  
Primary Production ◽  
Water Samples ◽  
Sample Selection ◽  
Natural Populations ◽  
Isolated Cells ◽  
Temperature Conditions ◽  
Ecological Experiments ◽  
Correct Determination ◽  
Production Measurement ◽  
Water Ecosystems

During sea ecological expeditions at determination of organic substance formation speed in the course of photosynthesis (sizes of primary production) researchers face need related to creation of special conditions for an exposition of containing the phytoplankton water samples which have been selected at different stations and depths, widely spaced and with different temperature and illumination values. Now for primary production measurement in all marine ecosystems’ photosynthesis zone which has an extent equal to several tens of meters, the standard methods for incubation of containing the phytoplankton water samples in the conditions of constant temperatures and illumination, considerably different from those horizons, where the studied samples were taken, are used. Such a technique based on the water samples incubation at artificial lighting in controlled temperature conditions has been accepted as the main one in the international ecological and monitoring programs (HELCOM, SCOR, etc.). Discrepancy of light and temperature conditions in a sample selection point and in the experiment can lead to distortions at a primary production assessment and light dependences determination. Primary production sizes’ correct determination at photosynthesis zone’s different depths with different temperature and illumination values demands creation of the most approached to the natural conditions for the exposition of containing the phytoplankton water samples. A new phyto-incubator for the water sample incubation at the primary production measurement is described in this paper. The phyto-incubator consists of light and thermo isolated cells with a system of temperature and illumination individual adjustment in each of the cells. The incubation of different samples containing the phytoplankton is carried out in various stabilized conditions on temperature and illumination by a constant light stream, established for each cell separately. Illumination and temperature values can be choose as any of the set range of sizes. Such installation allows to set a "grid" of parameters on temperature and illumination, on exhibiting duration, and to receive predictive estimates for primary production at the change of external conditions. Invention patent No. 2547685 "Incubator and Approach for Water Samples Incubation" has been obtained on the developed incubator. This phyto-incubator type can be also used for various ecological experiments with natural populations of plankton organisms in laboratory conditions.

scholarly journals Study of the Stability of Factor VIII Activity in Human Plasma for Fractionation When Modeling Deviations in the Storage and Transportation Temperature Conditions

2020 ◽  
Vol 20 (3) ◽  
pp. 202-207
Author(s):  
A. A. Gorodkov ◽  
A. L. Poptsov ◽  
A. L. Khokhryakov
Keyword(s):  
Factor Viii ◽  
Human Plasma ◽  
Temperature Regime ◽  
Factor Viii Activity ◽  
Clotting Factors ◽  
Short Term ◽  
Temperature Conditions ◽  
Plasma For Fractionation ◽  
The Stability ◽  
And Storage

The European Pharmacopoeia requires that the transportation and storage of human plasma for fractionation should be carried out at –20 °C or below, while allowing for some deviations in the temperature regime. The current Russian regulatory documentation requires the transportation and storage of plasma intended for the production of labile protein preparations (blood clotting factors) at –30 °C or lower. However, acceptable deviations from the temperature regime are not specified, which creates certain difficulties in their assessment by an authorised person during plasma batch release. The main tool in risk assessment is in-process control of factor VIII activity in plasma stored at inadequate temperature, which entails significant financial costs. The aim of the study was to assess stability of factor VIII activity in human plasma for fractionation when modeling deviations in the storage and transportation temperature regime and to assess the possibility of amending the regulatory documentation requirements. Materials and methods: only full individual doses of plasma obtained by apheresis were used in the experiments. The tests were performed under simulated high temperature conditions with accurate continuous recording of temperature by a measuring system. An automatic coagulation analyser was used to determine factor VIII activity. Quantitative evaluation of the results was carried out by comparing factor VIII activity in the plasma before freezing and in the tested plasma. Statistical processing of data was performed by descriptive statistics methods using Microsoft Excel 2007 applications. Results: no significant effect of short-term deviations in the storage temperature on the stability of factor VIII activity in human plasma for fractionation was observed. Conclusions: the obtained data can be used as a rationale for introducing changes in the official requirements for the storage and transportation temperature regime for human plasma for fractionation, as well as for including details of acceptable short-term deviations of the storage and transportation temperature regime in the regulatory documentation.

Assessment of food intensity and growth rate young sevryuga (Acipenser stellatus Pallas, 1771) depending on from the terms of fishing of growing ponds

2021 ◽  
pp. 36-47
Author(s):  
Ksenia Andreyevna Akhmedova ◽  
Lidia Mikhailovna Vasilyeva ◽  
Damelya Khazigaleeva Mazanova ◽  
Svetlana Alekseyevna Gutsulyak ◽  
Adelya Zakirovna Anokhina
Keyword(s):  
Growth Rate ◽  
Food Supply ◽  
Natural Populations ◽  
Water Bodies ◽  
Total Biomass ◽  
Artificial Reproduction ◽  
Feeding Intensity ◽  
Stellate Sturgeon ◽  
Acipenser Stellatus ◽  
Sturgeon Fish

Artificial reproduction of sturgeon fish in the Volga-Caspian basin in modern conditions is the only real opportunity to replenish natural populations with juveniles, therefore, increasing its efficiency is the key to restoring the stocks of these relict fish species. Improving the technological processes of growing juvenile sturgeon fish, including the Caspian stellate sturgeon, the number of which has been rapidly decreasing in recent years, is one of the main tasks at present. We studied the conditions for growing stellate sturgeon larvae in the nursery ponds for artificial reproduction at different periods of their watering. It is known that the stocking of ponds with larvae that have switched to exogenous feeding occurs at the end of June or the beginning of July, this coincides with the time of maximum water heating in nursery ponds to extreme (26–28 °C) values and with a depletion of the food supply in them. Hydrobiological studies were carried out to assess the food supply in water bodies that were watered in the traditional (June 12–14) terms (control option) and earlier (May 28) 2 weeks earlier than usual (experimental option). In addition, the intensity of feeding and the growth rate of juvenile starred sturgeon in the indicated ponds was studied for 20–24 days. The results of the studies performed showed that the food supply in the experimental pond was higher, so the zooplankton was represented by four orders, the biomass on average ranged from 2,8 to 4,6 g/m³, and in the control variant, planktonic organisms were represented by three orders, total biomass from 0,3 to 2,5 g/m³. The same tendency can be traced for zoobenthos. The feeding intensity of stellate sturgeon fry reared in ponds of early watering had indicators in terms of the gastrointestinal tract filling index, fatness coefficient and growth rates higher than the juveniles kept in water bodies of traditional watering periods.

scholarly journals Estimates of the genetic variability in a natural population of Bare-faced Curassow Crax fasciolata (Aves, Galliformes, Cracidae)

2001 ◽  
Vol 11 (4) ◽  
pp. 301-308 ◽  
Author(s):  
Sérgio Luiz Pereira ◽  
Anita Wajntal
Keyword(s):  
Genetic Variability ◽  
Power Plants ◽  
Captive Breeding ◽  
Natural Populations ◽  
Similar Data ◽  
Hydroelectric Power ◽  
Present Sample ◽  
In Captivity ◽  
The Mean ◽  
The Stability

Most of Brazil's electricity is generated by hydroelectric power plants that require the flooding of huge areas and affect the stability of local ecosystems. The area of the Porto Primavera power dam was flooded in 1998 and a rescue programme was executed to save the fauna sheltering on treetops or emerging islands. Using DNA fingerprinting we estimated the genetic variability in a sample of 23 Bare-faced Curassow Crax fasciolata rescued in this area and found that the mean heterozygosity was H=0.89. Although similar data on other natural populations of cracids is not available, the mean heterozygosity observed in the present sample is in the range found for free-living populations of two species of reintroduced cracids whose origin was captive breeding of a limited number of founders. We suggest that a collaborative captive breeding and reintroduction programme between the facilities holding the birds caught at Porto Primavera should start immediately to avoid the loss of genetic variability due to the small number of founders in captivity. Habitat protection, responsibility in fauna management and measures that prevent or correct the isolation of habitat fragments are needed to establish an equilibrium between progress and conservation in developing countries.

Sign in / Sign up

Export Citation Format

Share Document