Lobunicheva E. Zooplankton of anthropogenic habitats of the Severo-Dvinsky sluice system // Principy èkologii. 2019. № 2. P. 63‒75. DOI: 10.15393/j1.art.2019.7642


Issue № 2

Original research

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Zooplankton of anthropogenic habitats of the Severo-Dvinsky sluice system

Lobunicheva
   Ekaterina
Ph.D., Vologda department FSBSI "VNIRO", lobunicheva_ekat@mail.ru
Keywords:
Zooplankton
anthropogenic habitats
Severo-Dvinsky water system
canals
Vologda region
Summary: The article presents the results of studying zooplankton anthropogenic habitats of the Severo-Dvinsky sluice system (Vologda region). The research was conducted on six canals in July 2010. Sampling stations were distributed throughout the water system. Artificial water bodies of the Severo-Dvinsky water system were studied in Vologda region for the first time. In the zooplankton composition the species affiliation of rotifers (Rotifera) and crustaceans (Cladocera, Copepoda) was considered and determined. The dominant complex of species was revealed. The average number and biomass of species and groups, the Shannon-Weaver species diversity indices, and the average individual mass of organisms were calculated. The results showed that the composition of zooplankton of the canals was similar, and included 33 taxons (11 – Rotifera, 15 – Cladocera, 7 – Copepoda). Most species are typical for the water bodies of the taiga zone and have a wide ecological plasticity. Pelagic and benthic species prevail in the communities. Zooplankton of the canals is characterized by high values of species diversity index, low abundance and biomass, pronounced dominance of copepods. The colonization of the canals was carried out by organisms from small lakes and the Sheksna reservoir. Simple bottom configuration, the absence of a pronounced shallow-water zone and the wave impact determined the structure of modern communities. The absence of a vegetation zone and high turbidity of water are unfavorable for the development of a lot of organisms. Compared to small lakes, zooplankton of the canals is characterized by low species richness, abundance and biomass, the dominance of a small number of species, the predominance of small size individuals. Wherein, the structure of the dominant complex is similar. The identified features of the zooplankton of the canals are directly related to their anthropogenic origin and use as transport routes.

© Petrozavodsk State University

Received on: 13 March 2018
Published on: 17 June 2019

Introduction

At present, there are practically no territories and water areas on the earth's surface that are not affected by human activities. The existing classifications of modern landscapes distinguish anthropogenic landscapes, the structure and occurrence of which are associated with human activity (Milkov, 1973). Artificial water bodies (ponds, watered quarries, canals, reservoirs et al.) are characterized by special hydrologo- hydrochemical conditions and community structure (Waterworks, 1978, Konstantinov, 1986).

The largest artificial water-bodies (canals and reservoirs) were created for the purpose of shipping and energy production. At that, most of reservoirs were formed as a result of regulation of the existing riverbeds, which largely determines the dynamics of their communities (Pidgaiko, 1984). Canals are water supply structures and have artificial riverbed. Specificity of formation of biocenoses in canals is caused by their origin and features of communities of water objects which they connect. By their characteristics, canal communities occupy an intermediate position between typical lake and river cenoses.

In the territory of Vologda region the largest canals are Belozersky by-pass canal and the canals of Severo-Dvinskoy water system. Until the present, hydrobionts of these water objects are not practically studied. Earlier studies of zooplankton of water bodies of the North Dvina sluice system were fragmentary and limited only to lakes (Rivyer, 1978, 1982, 1988, 1992, 2012 etc., Rodionova, 1988).

The purpose of the work is to reveal the features of zooplankton of the canals of North Dvina sluice system as a typical anthropogenic habitat.


Materials

The investigations were carried out on 6 canals of North-Dvina sluice system in June 2010. North-Dvina water system is located in the central part of Vologda region in the territory of “Russky Sever” national park (Fig.1). It was constructed in 1825-1828, it connects the Sheksna and Sukhona rivers thus linking the basins of the Volga and Northern Dvina rivers. By its economical significance, North-Dvina system considerably inferior to the Volga-Baltic. Recently, its importance as a tourist route has been increasing.

 

Fig. 1. Schematic map of Severo-Dvinsk water system (hydrological sampling sites are denoted by red punch)

 

At present, the North-Dvina water system consists of the chain of small lakes connected by canals. The lakes of the water system are typical glacial water-bodies. Excluding Lake Siverskoye, all water-bodies are shallow, they are characterized by a pronounced thicket zone occupying up to 50% of the water area (Антипов и др., 1981; Краснова, 1999). Lake Siverskoye is the deepest of the lakes of the water system (maximum depth 25 m) and has a pronounced temperature stratification as well as small development of macrophytes, which occupy 5-10% of the lake area. Unlike lakes, canals are characterized by similar morphometric parameters, which is due to their earlier use as transport routes (Tabl.1). All the canals are characterized by a special wave regime, increased turbidity of water and the absence of pronounced macrophyte thickets.

 

Table 1. Main morphometric characteristics of the canals of the North Dvina gateway system

The canal name Objects that the connects canal Length, км Average width, м Depth, м
1 Toporninskiy Sheksninsky reservoir and Siverskoye lake 6.6 45.0 3.00
2 Kuz’minskiy Siverskoye and Pokrovskoye lakes 1.3 40.7 3.00
3 Pozdyshskiy (riv. Pozdyshka) PokrovskoyeandZaulomskoyelakes 2.7 65.0 3.00
4 1-stVazerinskiy Zaulomskoye and Pigasovo lakes 2.3 39.5 2.94
5 2-ndVazerinskiy PigasovoandKishemskoyelakes 2.8 42.5 2.94
6 Kishemskiy Kishemskoye lake and Itkla riv. 2.7 38.5 3.00

 


Methods

Zooplankton samples were collected in July 2010. The collection was carried out by a small Jedi network (74 microns mesh). A total of 45 samples were taken. Sampling stations were distributed throughout the canals (see Fig. 1). To clarify the species composition of zooplankton, samples were taken from areas occupied by macrophytes. Samples were fixed with 4% formalin. Cameral processing of samples was carried out in the Bogorov chamber in accordance with generally accepted methods in Hydrobiology using modern qualifier (Методика изучения…, 1975; Определитель зоопланктона…, 2010). In the zooplankton composition, the species of rotifers (Rotifera) and crustaceans (Cladocera, Copepoda) were taken into account and determined. The total body length was determined for each organism. The zooplankton biomass was calculated according to the equations for the relationship of individual body mass with body length (Балушкина, Винберг, 1979).

The analysis evaluated the average number and biomass of species and groups, the dominant complex of species (relative abundance more than 5 %) was determined, the Shannon-Weaver’s indices of species diversity (by numbers and biomass of zooplankton), Chekanovsky-Sjörensen of faunal similarity (Песенко, 1982), the average individual weight of zooplankton (Крючкова, 1987) were calculated. To assess the degree of variation of indicators in the calculations, the corresponding results of processing of several hydrobiological samples for each studied water object were used. The comparative analysis uses published data (Гордеева и др., 1978; Ривьер, 1978) and own unpublished materials on zooplankton of small lakes in the North Dvina water system.


Results

33 species were found in the zooplankton of the canals of the North Dvina system, including rotifers-11, cladocerans-15, and copepods – 7. The species richness of zooplankton in separate canals ranged from 17 (Kishemsky) to 28 (Toporninsky) species (table. 2). A feature of the canal zooplankton is the presence of the cold-loving Cyclops scutifer in its composition, which is also characteristic of small lake communities in the water system (Ривьер, 1982). Differences in species richness are mainly due to the different representation of cladocerans in the zooplankton, in particular species from family Sididae and Chydoridae.

 

Table 2. Taxonomic composition of zooplankton in water bodies of the North Dvina sluice system

Taxon Canals* Lakes of the water system
1 2 3 4 5 6
Тип Rotifera Cuvier, 1817              
Сем. Philodinidae Bryce, 1910              
Dissotrocha sp. +
Rotaria sp. + +
Сем. Euchlanidae Ehrenberg, 1838              
Euchlanis sp. + + +
Сем. Brachionidae Ehrenberg, 1838              
Brachionus diversicornis (Daday, 1883) + +
Keratella quadrata (Müller, 1786) + + + +d
K. cochlearis (Gosse, 1851) +d
Kellicottia longispina (Kellicott, 1879) +
Сем. Mytilinidae Harring, 1913              
Mytillina sp. +
Сем. Asplanchidae Eckstein, 1883              
Asplanchna priodonta Gosse, 1850 +d + +d + +d +d +
Сем. Trichocercidae Harring, 1913              
Trichocerca sp. + + + + + +
Сем. Synchaetidae Hudson and Gosse, 1886              
Polyarthra euryptera Wierzejski, 1891 +
Polyarthra sp. + + + + + + +
Сем. Conochilidae Harring, 1913              
Conochilus sp. + + + +
Сем. Filiniidae Harring and Myers              
Filinia longiseta (Ehrenberg, 1834) + + +d + +d + +
Сем. Lecanidae Lemane, 1933              
Lecane sp. +
Тип Arthropoda Latreille, 1829              
Надотряд Cladocera Latreille, 1829              
Сем. Sididae Baird, 1850              
Sida crystallina crystallina (O. F. Müller, 1776) + + + +
Diaphanosoma brachyurum Lievin, 1848 + + + + +
Сем. Daphniidae Straus, 1820              
Daphnia сristata Sars, 1862 + + + + + + +
D. сucullata Sars, 1862 + + + + + + +
D. longispina O. F. Müller, 1785 +
D. longiremis Sars, 1862 +
Ceriodaphnia quadrangula (O. F. Müller, 1785) + + + + + +
Scapholeberis mucronata (O. F. Müller, 1776) +
Сем. Bosminidae Sars, 1865              
Bosmina (Eubosmina) cf. coregoni Baird, 1857 + + +
Bosmina (E.) cf. longispina Leydig, 1860 +
B. (Bosmina) longirostris (O. F. Müller, 1785) +d + + + + + +d
Сем. Chydoridae Dybowski et Grochowski, 1894              
Acroperus harpae (Baird, 1834) + + + +
Alona affinis (Leydig, 1860) +
A. quadranqularis (O. F. Müller, 1785) +
A. rectangula Sars, 1862 +
Camptocercus lilljeborgi Schoedler, 1862 + + +
Chydorus sphaericus (O. F. Müller, 1785) + + + +d + + +d
Disparalona rostrata (Koch, 1841) + + + + +
Graptoleberis testudinaria (Fischer, 1851) + + +
Pleuroxus trigonellus (O. F. Müller, 1785) +
Pleuroxus sp. +
Сем. Eurycercidae Kurz, 1875              
Eurycercus (Eurycercus) lamellatus (O. F. Müller, 1776) +
Сем. Polyphemidae Baird, 1845              
Polyphemus pediculus (Linnaeus, 1761) +
Cем. Leptodoridae Lilljeborg, 1861              
Leptodora kindtii (Focke, 1844) + + + + + + +
Подкласс Copepoda Milne-Edwards, 1840              
Cем. Diaptomidae G.O. Sars, 1903              
Eudiaptomus gracilis (Sars, 1863) + + + + + + +
E. graciloides (Lilljeborg, 1888) +
Сем. Temoridae Sars, 1902              
Heterocope appendiculata (Sars, 1863) + + +
Ceм. Cyclopidae Dana, 1846              
Diacyclops bicuspidatus (Claus, 1857) +     +
Thermocyclops oithonoides (Sars, 1863) +
T. crassus (Fischer, 1853) +
Mesocyclops leuckarti (Claus, 1857) +d + +     + +d
Paracyclops affinis (Sars, 1863) +d +d +d +d +
Cyclops scutifer Sars, 1863 +d +d +d +d +d +d +d
Cyclops strenuus Fischer, 1851 +
Megacyclops viridis (Jurine, 1820) +
Eucyclops serrulatus (Fischer, 1851) +
Ectocyclops phaleratus (Koch, 1838) +
Cyclops sp. + + +
Harpactiformes + +
Total number of species, including: 28 21 17 22 19 17 48
Rotifera 7 6 7 6 5 5 12
Cladocera 14 9 6 10 10 8 22
Copepoda 7 6 4 6 4 4 14

Note. «–» – species is not detected, «+» – species is detected, «+d» – dominant view; * – canal designations are similar to table. 1.

 

The studied plankton communities of canals are characterized by significant equalization (table. 3). The values of the Shannon-Weaver’s indices of species diversity calculated from the number of zooplankton in the canals ranged from 1.8 ± 0.19 (2nd Vazerinskiy) to 3.2 ± 0.18 (Toporninskiy), and from 2.3 ± 0.18 (Kuzminskiy) to 3.1 ± 0.29 (1st Vazerinskiy), which corresponds to indicators in oligo- and mesotrophic reservoirs (Андроникова, 1996).

The average number of zooplankton in the canals of the North Dvina system was 110.2 ± 11.82 thousand specimens / m3, and the biomass was 0.6 ± 0.09 g / m3. The highest values of these characteristics were determined in a small Pozdyshkiy canal (Fig. 2). The dominant numbers and biomass in all the studied canals were Copepoda (see Fig. 2). They ranged from 68 (Kishemsliy) to 85% (2-nd Vazerinskiy) the total number and 67 (1st Aserinsky and Ceselski) to 89 % (Kuzminsky) of the total zooplankton biomass.

 

 

Fig. 2. The average abundance (A) and biomass (Б) of zooplankton of canals of Severo-Dvinsky water system (canals are indicated as in Table 1)

  

The dominant zooplankton complex in all canals is similar and includes 2-3 species. The only exception is Toporninskiy canal, where the composition of the dominant species is more diverse. The dominant species are mainly copepods – Cyclops scutifer, Paracyclops affinis. In separate canals (Toporninskiy, Pozdyshskiy, 2-nd Vazerinskiy, Kishemsliy) rotifers – Asplanchna priodonta and Filinia longiseta are dominant too. The predatory Asplanchna priodonta makes up from 5 (Toporninskiy) to 21% (Kishemskiy) of the total zooplankton biomass, the relative number of Filinia longiseta reaches 6 and 8% in the 2-nd Vazerinskiy and Pozdyshskiy canals, respectively. Among cladoceras, only Bosmina longirostris reaches in the Toporninsky canal the relatively high number and biomass. The share of this crustacean in the total average zooplankton population is 7 %, and in the biomass-2 %. The peculiarity of zooplankton in the canals is their small size, which causes small amounts of total biomass (table. 3). Thus, the average length of sexually matured dominant individuals (Cyclops scutifer and Paracyclops affinis) does not exceed 0.6–0.7 mm. In addition, copepodites make up a significant proportion of the number of these species (up to 10-15% in the sample).

 

Table 3. Zooplankton indicators of water bodies of the North Dvina sluice system

Indicators Canals* Lakes of the water system
1 2 3 4 5 6
Shannon-Weaver index (бит/экз.) 3.2 2.8 3.1 2.1 1.8 3.2 2.8
Shannon-Weaver index (бит/г) 2.9 2.3 2.5 3.1 2.4 2.7 2.5
The ratio of number of Cladocera and Copepoda 0.36 0.10 0.03 0.14 0.06 0.19 0.22
Average individual weight, mg 0.006 0.005 0.007 0.002 0.002 0.004 0.012

Note. * - canal designations similar to table. 1.


Discussion

Zooplankton of the canals of the North Dvina sluice system is represented by eurybiont organisms that are widely distributed in the region. The basis of the communities are pelagic and bottom species. The continuity of macrophyte thickets causes a small proportion of phytophilic organisms. The registered phytophilic organisms were represented by single individuals, most likely introduced into canals from nearby lakes. The similarity of morphological characteristics and the history of formation cause a significant similarity in the taxonomic composition of zooplankton in all canals, which is confirmed by the values of the Chekanovsky-Sjörensen Index indices (more than 0.7). The most specific, compared to other canals, is the zooplankton composition of the Toporninskiy canal. Macrophyte thickets, including submerged ones, formed on some parts of this water body, which are favorable for the habitat of some cladocerans. In addition, the fauna of this canal is being enriched from the nearby sections of the Sheksninsky reservoir.

After the creation of artificial water bodies, they are populated by organisms that can adapt to new living conditions (Caley, Schluter, 1997; Louette et al., 2008; Hadasova, Kopp, 2014). The few data on the structure of canal communities in the Vologda region indicate that the species composition and structure of the dominant zooplankton complex of these water bodies are determined by water source reservoirs. Thus, for the Belozerskiy bypass canal, the dominance of Kellicottia longispina, Bosmina longirostris, and Eudiaptomus gracilis, which are present as part of the dominant complex in Beloye lake (Думнич, Лобуничева, 2016), is noted. The zooplankton structure of the canals of the Northern slope of the Volga-Baltic water system is also very similar to that of the reservoirs they connect (Лобуничева, 2013). Similar patterns are observed for other canals (Гордеева и др., 1978, Akopian et al., 1999).

Settlement of the canals of the North Dvina water system occurred primarily by organisms from small lakes, which are reservoirs-water sources. These lakes are characterized by a rich zooplankton inherent of meso-eutrophic reservoirs (see table. 2). Differences in the structure of zooplankton in lakes are related to their morphological features. Thus, the zooplankton of the relatively deep-water lake Siverskoye, where hypolimnion is expressed and the highest water transparency is noted (1.5-2 m), is characterized by oligotrophy, in particular low biomass values (0.3-0.4 g / m3). Other lakes are shallow, have a pronounced thicket zone, the water transparency in them does not exceed 1.5 m. In these reservoirs, higher values of zooplankton biomass (Kishemskoe – 0.4 g/m3, Zaulomskoe – 1.4 g/m3 (Ривьер, 1978; own unpublished data)). The structure of the dominant zooplankton complex in all natural reservoirs of the water system is similar.

The dominant group of organisms in all canals were copepoda crustaceans. The predominance of Cyclopidae among zooplankters is directly related to the formation of their communities. In the small lakes of the North Dvina system, the zooplankton is mainly based on Cyclopidae, which is associated with increased turbidity of the water (Ривьер, 1978, 1982). In addition, the absence of a shallow coastal zone occupied by macrophytes in the canals does not allow many species of cladoceras, which are typical for most water bodies in the region, to develop in masse (even in the warmest summer period).

The number and biomass of planktonic animals in the studied canals is slightly higher than in water bodies similar in origin, as well as in small rivers in the region. According to our own research, the average zooplankton biomass in the Belozersky bypass canal and the canals of the Northern slope of the Volga-Baltic water system in the summer is 0.2 and 0.4 g / m3, respectively. Apparently, some increase in the level of zooplankton development in the canals of the North Dvina sluice system is associated with a more pronounced lake regime. The number and biomass of zooplankton in canals with river water sources is significantly lower (Гордеева и др., 1978, Akopian et al., 1999). For reservoirs of the Northern slope of the White sea-Baltic canal, it is indicated that the average zooplankton biomass of the lake part of the canal route is 0.4 g/m3, while in the river part it is only 0.1 g/m3 (Гордеева и др., 1978).


Conclusions

A total of 33 species (Rotifera – 11, Cladocera – 15, Copepoda – 7) were found in the zooplankton of the canals of the North Dvina sluice system. Most species are eurybiont. The taxonomic composition of zooplankton in canals is similar (the Chekanovsky-Sjörensen coefficient is more than 0.7). Initially, the settlement of these water bodies was due to organisms from small lakes and the Sheksninsky reservoir, with which the canals are directly connected. Currently, the penetration of planktonic animals in the canals also happened. However, the morphological features of the canals (simplified bottom relief, absence of a pronounced shallow zone) and wave action determine the structure of the communities formed in them. The almost complete absence of thickets of higher aquatic plants is unfavorable for the development of many zooplankton species. As a result, zooplankton canals are characterized by low species richness with a predominance of pelagic and bottom-dwelling species.

Compared with small lakes, zooplankton canals are characterized by low numbers and biomass, the dominance of a small number of species, and the predominance of small individuals. The structure of the dominant complex is similar. With relatively low numbers and biomass, the basis of zooplankton is made up of copepoda crustaceans. The identified features of zooplankton in canals are directly related to their anthropogenic origin and operation as transport routes. Specific morphological and hydrological characteristics of these water bodies cause a simplified structure and a low level of zooplankton development.


References

Akopian M., Garnier J., Pourriot R. A large reservoir as a source of zooplankton for the river: structure of the populations and influence of fish predation, Journal of Plankton Research. 1999. Vol. 21. P. 285–297.

Andronikova I. N. Structural and functional organization of zooplankton in lake ecosystems. SPb.: Nauka, 1996. 189 p.

Antipov N. P. Zhakov L. A. Lebedev V. G. Shevelev N. N. The lakes of landscapes of hilly-glacier plains, Ozernye resursy. Vologda, 1981. P. 38–93.

Balushkina E. V. Vinberg G. G. The relationship between the length and weight of plankton Crustacea, Eksperimental'nye i polevye issledovaniya biologicheskih osnov produktivnosti ozer. L.: ZIN AN SSSR, 1979. P. 58–79.

Caley M. J., Schluter D. The relationship between local and regional diversity, Ecology. 1997. Vol. 78. P. 70–80.

Dumnich N. V. Lobunicheva E. V. Zooplankton dynamics in the lake area of Sheksna reservoir (Vologda region), Sovremennoe sostoyanie bioresursov vnutrennih vodoemov i puti ih racional'nogo ispol'zovaniya: Materialy dokladov Vserop. konf. s mezhdunar. uchastiem, posvyasch. 85-letiyu Tatarskogo otdeleniya GosNIORH (Kazan', 24–29 oktyabrya 2016 g.). Kazan', 2016. P. 338–349.

Gordeeva L. I. Sokolova V. A. Makarov V. P. The hydrobiological regimes of the Belomor-Baltic of the canal, Gidrobiologiya Vygozerskogo vodohranilischa. Petrozavodsk, 1978. P. 134–156.

Hadasova L., Kopp R. Monitoring of the initial succession of zooplankton communities in newly created ponds within the Territorial System of Ecological Stability, MendelNet 2014. Proceedings of International PhD Students Conference. Mendel University in Brno, Czech Republic, November 19th and 20th. 2014. P. 245–249.

Identification guide to zooplankton and zoobenthos of freshwater bodies of European Russia. Vol. 1. Zooplankton. M.: Tovarischestvo nauchnyh izdaniy KMK, 2010. 495 p.

Konstantinov A. S. The general hydrobiology. M.: Vysshaya shkola, 1986. 472 p.

Krasnova A. N. Structure of hydrophilous flora in waterbodies of the North Dvina water system transformed under technogenic activity. Rybinsk: OAO «Rybinskiy Dom pechati», 1999. 200 p.

Kryuchkova N. M. The structure of zooplankton communities in water bodies of different types, Produkcionno-gidrobiologicheskie issledovaniya vodnyh ekosistem (Tr. ZIN AN SSSR). L., 1987. T. 165. P. 184–198.

Lobunicheva E. V. Zooplankton of the reservoirs of the northern slope of the Volga-Baltic Waterway, Biologiya vnutrennih vod: Materialy XV Shkoly-konferencii molodyh uchenyh (Borok, 19–24 oktyabrya 2013 g.). Kostroma, 2013. P. 246–250.

Louette G., De Meester L., Declerck S. Assembly of zooplankton communities in newly created ponds, Freshw. Biol. 2008. Vol. 53 (11). P. 2309–2320.

Mil'kov F. N. Man and landscapes: anthropogenic landscape studies essays. M.: Mysl', 1973. 224 p.

Pesenko Yu. A. Principles and methods of quantitative analysis in faunal studies. M.: Nauka, 1982. 287 p.

Pidgayko M. L. Zooplankton of reservoirs of European part of the USSR. M.: Nauka, 1984. 207 p.

Procedures of studying biogeocoenoses of inland waterbodies. M.: Nauka, 1975. 240 p.

Riv'er I. K. Cold-water zooplankton of the lakes of the Upper Volga basin. Izhevsk: Izdatel' Permyakov P. A., 2012. 390 p.

Riv'er I. K. Ecology of Cladocera in winter waterbodies, Sovremennye problemy izucheniya vetvistousyh rakoobraznyh. SPb.: Gidrometeoizdat, 1992. P. 65–80.

Riv'er I. K. The features of functioning zooplankton communities in waterbodies of various types, Struktura i funkcionirovanie presnovodnyh ekosistem. L.: Nauka, 1988. P. 80–111.

Riv'er I. K. The modern state of zooplankton of the waterbodies of the Volga-Baltic and Severo-Dvina water systems, Trudy IBVV AN. Vyp. 43 (46). Ekologicheskie issledovaniya vodoemov Volgo-Baltiyskoy i Severo-Dvinskoy vodnyh sistem. L.: Nauka, 1982. P. 90–103.

Riv'er I. K. Zooplankton in the waterbodies of the route of the northern rivers transfer, Biologicheskie resursy vodoemov Vologodskoy oblasti, ih ohrana i racional'noe ispol'zovanie: Tezisy k nauch, prakt. konf. Vologda, 1978. P. 26–28.

Rodionova N. V. The daily vertical distribution of zooplankton in two mesotrophic lakes, Intensifikaciya rybnogo hozyaystva na vnutrennih vodoemah: Sb. nauch. tr. GosNIORH. Vyp. 288. L., 1988. P. 104–105.

The hydrotechnical constructions. M.: Stroyizdat, 1978. 647 p.

Zhao Kun, Wang Lizhu, Riseng Catherine, Wehrly Kevin, Pan Yangdong, Song Kun, Da Liangjun, Pang Wanting, You Qingmin, Tian Hua, Liu Shuiqin, Wang Quanxi. Factors determining zooplankton assemblage difference among a man-made lake, connecting canals, and the water-origin river, Ecological Indicators. 2018. Vol. 84. P. 488–496.


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