Biology

Features of the species composition and structure of fish communities in small anthropogenic reservoirs with different content of dissolved mineral nitrogen

In 22 small anthropogenic reservoirs with an area of 0.4 to 62 ha located in the territory of the Udmurt Republic, individuals of different fish species were captured and water samples were taken in late spring for analysis of NO3 –, NO2 – and NH4 + content. In many reservoirs, concentrations of ammonium exceed the maximum permissible according to the fishing standards for water quality, and in some this is also the case with nitrites.

Economic and biological characteristics of the biotypical composition of spring wheat varieties

The aim of this work is to study the component composition and intravarietal polymorphism of storage proteins of three soft and one hard varieties of spring wheat and their relationship with a complex of economically valuable traits. The studies were carried out in 2018–2020 by the department of genetics and immunity at the institute, in the conditions of the southeast of the Central Black Earth Region.

The structure of productivity elements of durum wheat varieties of Saratov selection

The objects of the study were plants of 14 varieties of durum wheat Triticum durum Desf., permitted for use at different times in the period from 1975 to 2014. An analysis of the elements of ear productivity in durum wheat plants of Saratov varieties under the conditions of 2020 was carried out. The varietal features of the development of the spike of the main shoot were revealed according to a number of characteristics: the number of spikelets in a spike, the number of grains in an ear, the weight of a grain, the number of ungrained and grained spikelets.

Vegetation of the natural monument “Urochishche Kuzilinka” and its surroundings (Orel region)

The article describes the calciphytic steppe communities located in the territory of the natural monument “Urochische Kuzilinka” and its surroundings (Orel region). The communities were assigned to the association Onosmato simplicissimae–Salvietum nutantis Averinova ass. nov. That unit was included in the sub-union Bupleuro falcati–Gypsophilenion altissimae Averinova 2005 (union Festucion valesiacae Klika 1931, order Festucetalia valesiacae Soó 1947, class Festuco–Brometea Br.-Bl. et Tx. ex Soó 1947) on the basis of a diagnostic species analysis. The new association was characterized.

The Genus Alchemilla L. (Rosaceae) in the Flora of Chuvashia

In the flora of the Chuvash Republic, 40 species of the genus are revealed. 11 of these (A. altaica, А. argutiserrata, A. barbulata, A. cheirochlora, A. exilis, A. gibberulosa, A. hebescens, A. oxyodonta, A. plicata, A. sibirica, A. vorotnikovii) are registered in the Republic for the first time. Earlier, two species (A. pustynensis Czkalov and A. obtusa auct. non Buser) were noted here erroneously. Species are revealed whose richness corresponds to the level seen in neighbouring regions and approaches the maximum possible.

Influence of Amanita muscaria (class Agaricomycetes, fam. Amanitaceae) and Flammulina velutipes (class Agaricomycetes, fam. Physalacriaceae) on the growth and development of seedlings of Picea abies (class Pinophyta, fam. Pinaceae) and Abies sibirica (cla

The article presents studies of the influence of Amanita muscaria and Flammulina velutipes on the growth and development of seedlings of species of the Pinaceae family. The positive effect of mycorrhization by these fungi species on the growth and development of Picea abies and Abies sibirica was established. Thus, the presence of Flammulina velutipes and Amanita muscaria in the substrate accelerated the appearance of the first shoots by 4–8 days. Mycorrhization of Amanita muscaria influenced the morphometry of the seedlings of Picea abies and Abies sibirica.

Diagnostics of Seed Reproduction Mode in Some Species Calamagrostis Adans. from Flora of Peninsula Kamchatska

The mode of seed reproduction in four species Calamagrostis of peninsula Kamchatka (Russia) flora has been examined (C. langsdorffii (Link) Trin., C. lapponica Wahl., C. neglecta (Ehrh.) Gaertn., C. sesquiflora Trin.). In C. lapponica and C. neglecta studied plants are characterized by highly degree of pollen sterility (61,2 and 24,8% respectively) and significant variation of pollen grains size (CV = 17,4 and 18,7%), which is typical for apomictic forms. The embryological particulars specific to apomictic plants were found in the analysis of female generative sphere too.

Species Composition of Beetles (Insecta: Coleoptera) Border Area «Wate – Land» of Medveditsa River Lysogorsky District (Saratov Area)

The article contains the results of the coastal beetles research (Medveditsa river Lysogorsky district Saratov region). There is also a brief description of the investigated biotope. List of 19 faunal species of beetles, that contains 9 species and one family, which are specified as new to the fauna of the Saratov Area, is presented. The representatives of investigated set of beetles are divided into ecological groups.

To the Question of the Suitability of Soils Territory the Educational Centre «Botanical Garden» of Saratov State University for Growing Hybrid Gladiolus

The hybrid gladiolus occupies one of the leading places among the huge number of perennial plants thanks to its decorative qualities and the timing of flowering. In order to select a site for the cultivation of gladiolus it is necessary to consider its requirements for agrochemical soil condition. The analysis was made of the soil territory the Educational Centre «Botanical Garden» of Saratov State University, which is used for the cultivation of corms gladioli. Necessary measure agrochemicals have been considered, in order to successfully cultivate gladioli in a botanical garden. 

Water Buttercups in Herbarium of Saratov State University (SARAT, SARP)

Labels of specimens of genus Batrachium in Herbarium of Saratov State University (SARAT, SARP) are given. Comments to determination of some species of this genus are given.

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