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Biosystems
Diversity
ISSN 2519-8513 (Print) ISSN 2520-2529 (Online) Biosyst. Divers., 26(2), 123-127 doi: 10.15421/011819
Features of the daily dynamics of trophic activity of various types of blood-sucking mosquitoes (Diptera, Culicidae) in the south of Tyumen region
Khlyzova, T. A (2018). Features of the daily dynamics of trophic activity of various types of blood-sucking mosquitoes (Diptera, Culicidae) in the south of Tyumen region. Biosystems Diversity, 26(2), 123-127. doi:10.15421/011819
We conducted research on the determination of the daily activity of blood-sucking mosquitoes of the family Culicidae in 2005-2015 in the south of Tyumen region in three climatic zones (subzones): the subzone of the southern taiga (Nizhnetavdinsky district), the subzone of aspen-birch forests (Tyumen and Yalutorovsky districts) and in the forest-steppe zone (Isetsky district). In each of the three subzones, counts were conducted twice for the summer season - in June and July. A high number of blood-sucking mosquitoes in the south of the Tyumen region have 24-hour activity. The maximum number in all natural and climatic zones of the region is observed at 23 hours. The daily rhythm of activity of certain species of mosquitoes depends on their abundance in the summer season and on their ecological characteristics. The optimal meteorological conditions under which an active flight of mosquitoes are observed: air temperature 12.6-26.0 °C, relative humidity of air - 54-100% and illuminance - 0-8600 lux. In studying the circadian rhythm, 29 mosquito species of the family Culicidae, belonging to 6 genera: Anopheles, Culiseta, Coquillettidia, Aedes, Ochlerotatus and Culex, were recorded. In the subzone of the southern taiga, we recorded a flight of 25 species, in the subzone of small-leaved aspen-birch forests -20, and in the forest-steppe zone - 24. The peak of species diversity in all three subzones coincided with the maximum number. All registered species in terms of temperature preferences (thermophilicity) can be conditionally divided into two groups. The first group (10 species) are species that actively attack at a temperature 10-20 °C. The second group (19 species) are species that actively attack at an air temperature 10-30 °C.
Keywords: mosquitoes; species diversity; daily rhythm of activity; air temperature
T. A. Khlyzova
Tobolsk Complex Scientific Station UD RAS, Tobolsk, Russia
Article info
Received 03.03.2018 Received in revised form
19.04.2018 Accepted 21.04.2018
Tobolsk Complex Scientific Station UD RAS, acad. Y. Osipova st., 15, Tobolsk, 626152, Russia. Tel.: +7-909-735-84-88 E-mail:
labdezinsekcii@mail. ru
Introduction
Over the day, the activity of Culicidae changes due to the constant impact of periodically changing environmental factors. According to the literature data, daily rhythm of Culicidae activity significantly depends on the number of these insects over the year of study and meteorological conditions during the period of the study. The greatest impact on the activity of mosquitoes, according to a number of researchers, is caused by the temperature and relative humidity, illuminance and wind (Monchadskiy, 1950, 1958; Polyakova & Patrusheva, 1974; Chernyshev, 1981). Depending on the fluctuations of these meteorological characteristics over the day, the activity of mosquitoes significantly varies. The activity of mosquitoes increases in the evening - before sundown and in the morning - before sunrise. Quick transition of daylight to twilight and night darkness to sunrise is a stimulus for female mosquitoes. Over the day, the activity of mosquitoes is inhibited by high temperature and bright light, and in the night - by decrease in the temperature and the dark. The activity of mosquitoes is to a large extent affected by heavy rains and dew. Insignificant rains have no impact on the most species of mosquitoes. The optimum humidity for mosquitoes ranges within 50-99% (Anuf-riyeva, 1971; Red'kina, 2008). Because in various geological areas and natural-climatic zones, different meteorological conditions are formed, the daily local rhythm of mosquito activity has a number of peculiarities.
Materials and methods
tavdinsky District), the subzone of aspen-birch forests (Tyumen & Yalutorovsky Districts) and the forest-steppe zone (Isetsky District). In each of the three subzones, counts were made twice over the summer season - in June and July.
The count of attacking mosquitoes was conducted using a butterfly net with removable mesh (Rasnitsyn & Kosovskikh, 1979) in 5 replications. The trajectory of every sweep of the butterfly net resembled the figure "eight" and consisted of two moves: at the level of the head and level of the knees. One replication included 10 such sweeps. Each replication of the count was made at a new spot, moving 20-30 steps along a fixed route in a selected plot after a change of net by, i.e. along a so called transect. Because during the day, mosquitoes prefer forest areas of pastures, an area of collecting usually was a forest edge and forest 30 m away from the edge. At the same time, we used the schemes suggested by Lubishevy (1958) and Pesenko (1982). Unlike the method of quantitative count along a transect, described by Petrozhytska et al. (2002), we made our counts only in particular areas, without repeated visits, and not constantly along a route in a there and back manner. The interval between the counts was two hours. At the same time, we recorded the temperature and relative humidity, wind speed, the amount of precipitation.
For identification of the species composition of mosquito imagoes, we used special identification tables of Kukharchuk (1980) and Gornostayeva & Danilov (1999), classifying Ochlerotatus subgenus as a genus (Gornostayeva, 2009).
Results
We conducted our study on the determination of daily activity of Culicidae in 2005-2015 in the south of Tyumen oblast and three natural-climatic zones (subzones): the subzone of northern taiga (Nizhne-
The studies conducted earlier determined that in the conditions of the subzone of the southern taiga, under the canopy of the forest, during the mass flight in the June-July - mosquitoes struck humans
throughout the day (Khlyzova & Pavlova, 2006; Khlyzova & Latkin, 2015). In June, the highest number of mosquitoes was observed at 23 h (i.e. 11 pm ) and from 3h to 7h (i.e. 3 am - 7 am). In late July, two maxima were observed over the 24 h activity: 21-23 h and 5-7 h. On open ground, the number of mosquitoes was much lower compared to the forest, and the daily dynamic of the flight in June was characterized by prolonged activity in the night (from 23 to 5 h) and the absence of strikes over the day.
During the study on the daily rhythm of mosquitoes activity in the conditions of the subzone of the southern taiga, we recorded flight of 25 species (Table 1). The maximum species diversity was recorded at 23 h. At that time, there were observed strikes by 20 species of mosquitoes: the complex Anopheles maculipennis Mg., Culiseta alaskaensis Ludl., Coquillettidia richiardii Fic., Aedes cinereus Mg., Ae. rossicus D. G. M., Ae. vexans Mg., Ochlerotatus caspius Pall., O. cantans Mg., O. riparius D. K., O. mercurator Dyar., O. behningi Mart., O. excrucians Walk., O. euedes H. D. K., O. cyprius Ludl., O. flavescens Mull., O. communis Deg., O. punctor Kirby, O. dian-taeus H. D. K., O. intrudens Dyar., Culex modestus Fic. For the rest of the time, the number of attacking species ranged from 12 to 19. We observed the minimum species diversity of mosquitoes at 15 h, when active strikes were made by females of 12 species of mosquitoes. 24 h activity was manifested by 10 species: Ae. cinereus, Ae. ve-xans, O. cantans, O. riparius, O. excrucians, O. euedes, O. cyprius, O. communis, O. punctor, O. diantaeus. The shortest period of activi-
ty was observed among C. richiardii and C. modestus, these species were found caught only at 23 h.
In the subzone of small-leaved aspen-birch forests of Tyumen oblast in June, the peak activity of strikes of mosquitoes in the forests was recorded in the period 23-5 h, and at 23 h and 7-11 h on open ground. The peaks of the number of mosquitoes were observed in June under the forest canopy at 23 and 5 h. On open ground, the maximum activities of mosquito strikes were recorded at hour 23 h and 7 h as under the forest canopy (Khlyzova & Latkin, 2015).
In July, the period of the highest mosquito activity under the forest canopy and on open ground lasted from 21 h to 5 h. The peaks of activity were recorded at 21 h and 5 h, and at 1 h on open ground.
During recording the 24 h rhythm of mosquitoes' activity, we observed active strikes at humans by females of 20 species of mosquitoes (Table 2). The period of activity of most species recorded during the counts (17-19 species) lasted from 21 h to 3 h, i.e. in the period of the optimum meteorological conditions (temperature and relative humidity and illuminance). The peak of species diversity was recorded at 23 h, when the highest number of striking mosquitoes during the 24 h period was observed. At that time, we recorded strikes of females of 19 species: Culiseta morsitans Theob., Ae. cinereus, Ae. rossicus, Ae. vexans, O. caspius, O. cantans, O. riparius, O. mercurator, O. behningi, O. excrucians, O. euedes, O. cyprius, O. flavescens, O. communis, O. punctor, O. diantaeus, O. intrudens, O. cataphylla Dyar. and C. modestus.
Table 1
Twenty-four-hour activity of different species of mosquitoes in the conditions of the southern taiga
The number of individuals caught
species 07 h 09 h 11 h 13 h 15 h 17 h 19 h 21 h 23 h 01 h 03 h 05 h Total
Aedes cinereus Mg. 115 111 36 15 59 72 52 215 321 47 26 64 1 133
Ae. vexans Mg. 36 22 36 4 6 18 20 54 170 35 36 31 468
Ochlerotatus cantans Mg. 423 302 215 126 66 127 111 379 590 133 93 354 2 919
O. riparius D. K. 59 134 70 16 16 5 26 34 60 40 62 85 607
O. excrucians Walk. 249 203 123 72 66 72 78 190 390 135 98 337 2 013
O. euedes H. D. K. 40 91 40 10 4 7 7 25 68 27 26 55 400
O. cyprius Ludl. 27 20 4 3 5 9 10 16 9 18 7 42 170
O. communis Deg. 61 26 7 6 7 14 4 55 82 15 3 57 337
O. punctor Kirby 199 181 76 27 16 24 19 98 353 177 144 279 1 593
O. diantaeus H. D. K. 139 45 16 6 17 27 31 44 124 24 19 52 544
Ae. rossicus D. G. M. 8 - 1 - - - - 9 7 4 - 9 38
O. caspius Pall. 3 7 - - - 14 - 13 50 1 11 2 101
O. mercurator Dyar. 3 15 - - 4 8 5 7 5 6 2 - 55
O. intrudens Dyar. 80 5 20 8 - - - - 10 - 3 - 126
Culiseta longiareolata Macq. 8 - - - - - - - - - - - 8
O. dorsalis Mg. - 1 1 1 - 7 6 9 - 1 1 - 27
O. leucomelas Mg. - 3 - - - - - - - - - - 3
O. cataphylla Dyar. - - 10 1 - - - - - - - - 11
O. flavescens Mull. - - - - 2 - 3 6 24 5 - 3 43
O. behningi Mart. - - - - - - - 3 4 2 3 - 12
Комплекс Anopheles maculipennis Mg. - - - - - - - - 22 7 5 - 34
Cs. ochroptera Peus - - - - - - - - - 3 3 - 6
Cs. alaskaensis Ludl. - - - - - - - - 7 5 2 - 14
Coquillettidia richiardii Fic. - - - - - - - - 16 - - - 16
Culex modestus Fic. - - - - - - - - 11 - - - 11
Total: individuals 1 450 1 166 655 295 268 404 372 1 157 2 323 685 544 1 370 10 689
of species 15 15 14 13 12 13 13 16 20 19 18 13 25
In the daytime, the number of flying species decreased to 8-16. Twenty-four-hour activity was observed among 5 species of mosquitoes: Ae. cinereus, Ae. rossicus, Ae. vexans, O. cantans and O. excru-cians. The shortest period of flight was recorded for two species: C. morsitans, strikes of females of this species on humans were recorded only at 23 h, and Ochlerotatus sticticus Mg., single females of this species were caught at 3 h.
In the conditions of forest-steppe zone of Tyumen oblast, we determined that in June under the forest canopy, mosquitoes struck humans throughout the 24 h period. On open ground, mosquitoes were not active in the daytime, their strikes was not recorded from 9 h to 17 h and at 21 h. In the twenty-four-hour rhythm of activity in both habitats, we observed two peaks at 23 h and 05 h (Khlyzova & Latkin, 2015). In July, under the forest canopy, mosquito strikes were
not observed only at 15 h and 19 h, and on open ground, they actively struck only at 23 h and 5 h.
During the study of the twenty-four-hour rhythm of mosquito activity in the forest-steppe zone of Tyumen oblast, we recorded strikes of 24 species of mosquitoes (Table 3). Active flight of the highest number of species (14-16 species) was observed in the period from 23 h to 1 h, i.e. during the maximum 24 h activity. Maximum species diversity was observed at 23 h - at that time, we recorded strikes on humans by C. richiardii, Ae. cinereus, Ae. rossicus, Ae. vexans, O. caspius, O. dorsalis Mg., O. behningi, O. cantans, O. riparius, O. excrucians, O. euedes, O. cyprius, O. punctor, O. diantaeus, O. intrudens and C. pipiens. In the daytime, only individuals of the most common species were observed. The minimum species diversity was recorded at 11 h (i.e. 11 am), when humans were struck by
single individuals of O. riparius, O. punctor and O. diantaeus, and at 13 h, when the counts included O. cantans, O. diantaeus and Ae. rossicus. The species which in the southern taiga and small-leaved aspen-birch forests were characterized by twenty-four-hour activity, due to their low number, struck mostly in the evening and morning hours in the forest-steppe zone.
During conducting all the recording of the 24-h rhythm of mosquito activity, the air temperature fluctuated within 10-30 °C. We recorded no temperature below 10 and above 30 °C. The analysis of meteorological conditions over the 24-h recording in 2005-2015 indicated active strikes of mosquito females at the temperature of 12.6-30.0 °C, relative humidity of 33-100% and 0-37,000 lux illuminance. During the highest activity of mosquitoes, the air temperature equaled 12.6-26.0 °C, relative humidity - 54-100%, illuminance -0-8,600 lux. All 29 species recorded over the study could be conventionally divided into two groups in relation to their preferences (ther-
mophilicity): the species which actively struck at the temperature 1020 °C, and species which actively struck at the air temperature 1030 °C (Table 4). The first group included 10 species, one of them (C. ochroptera) had a clearly manifested peak of activity at the temperature range of 10-15 °C, 6 species (A. maculipennis complex, C. alaskaensis, C. morsitans, C. richiardii, C. modestus and C. pipi-ens) struck most actively at 15-20 °C, three species (O. sticticus, O. pionips and O. behningi) had no clearly manifested peak of activity and practically equally struck both at 10-15 and at 15-20 °C.
The second group is represented by 19 species. Among them, 14 species had their peak strike activity at the temperature of 1520 °C, and two species (O. leucomelas and C. pipiens) were observed to strike only at this temperature, one species (O. dorsalis) at the air temperature of 20-25 °C. O. punctor was the most active at 1020 °C, and O. cantans - at 15-25 °C. Therefore, the highest number of mosquitoes was caught at the air temperature of 15-20 °C.
Table 2
Twenty-four-hour activity of different species of mosquitoes in the conditions of the subzone of small-leaved aspen-birch forests
Number of individuals caught
species 07 h 09 h 11 h 13 h 15 h 17 h 19 h 21 h 23 h 01 h 03 h 05 h Total
Aedes cinereus Mg. 211 61 51 27 31 44 36 272 441 170 140 102 1 586
Ae. rossicus D. G. M. 4 14 14 6 7 4 7 51 95 41 43 25 311
Ae. vexans Mg. 16 24 19 10 2 14 13 21 52 37 25 49 282
Ochlerotatus cantans Mg. 98 84 67 52 45 17 21 98 378 109 138 206 1 313
O. excrucians Walk. 51 20 26 24 47 7 12 46 162 83 101 130 709
O. caspius Pall. 1 6 10 8 12 6 5 6 5 2 - - 61
O. riparius D. K. 7 7 1 - 1 - 3 4 22 4 18 8 75
O. mercurator Dyar. 7 7 7 - - - - 7 37 4 2 4 75
O. euedes H. D. K. 7 8 5 5 2 - 2 7 36 38 25 36 171
O. cyprius Ludl. 3 - - 7 4 2 3 16 52 2 7 14 110
O. punctor Kirby 11 19 23 6 - 3 10 29 45 14 28 18 206
O. communis Deg 2 - - - - - - 14 8 8 4 8 44
O. diantaeus H. D. K. 3 1 - 8 - - - 5 17 8 11 18 71
O. intrudens Dyar. 6 - - - - - - - 7 13 10 13 49
O. cataphylla Dyar. 2 - - 3 - - - 1 1 - - 8 15
O. behningi Mart. 1 - - - - - - - 7 5 1 - 14
O. flavescens Mull. - 8 - 3 2 - 5 9 77 22 27 4 157
Culiseta morsitans Theob. - - - - - - - - 8 - - - 8
O. sticticus Mg. - - - - - - - - - - 2 - 2
Culex modestus Fic. - - - - - - - - 6 4 2 - 12
Total: individuals 430 259 223 159 153 97 117 586 1 451 564 584 643 5 271
of species 16 12 10 12 10 8 11 15 19 17 17 15 20
Table 3
Twenty-four-hour activity of different species of mosquitoes in the conditions of forest-steppe zone
Species Number of individuals caught Total
07 h 09 h 11 h 13 h 15 h 17 h 19 h 21 h 23 h 01 h 03 h 05 h
Coquillettidia richiardii Fic. 4 - - - - - - - 9 1 - 10 24
Ochlerotatus cantans Mg. 4 6 - 2 5 4 - 7 22 4 4 11 69
O. riparius D. K. 2 2 1 - - - - - 6 1 - 5 17
O. excrucians Walk. 6 2 - - 2 4 3 5 5 5 8 10 50
O. punctor Kirby 2 8 1 - 7 4 - 2 28 8 21 50 131
O. diantaeus H. D. K. 3 4 1 1 - 2 4 6 2 - 12 24 59
Aedes cinereus Mg. 4 - - - - - - 6 13 4 - 2 29
Ae. rossicus D. G. M. 2 - - 1 - - - 1 4 1 - - 9
O. intrudens Dyar. - 2 - - - - 3 - 2 - - - 7
O. euedes H. D. K. - - - - 2 2 3 2 9 3 2 12 35
O. flavescens Mull. - - - - - - 3 - - 1 - - 4
O. cataphylla Dyar. - - - - - - 3 - - - 1 - 4
O. caspius Pall. - - - - - - - 1 6 1 - 5 13
O. communis Deg. - - - - - - - 1 - - - 2 3
Ae. vexans Mg. - - - - - - - 2 18 4 - 9 33
O. dorsalis Mg. - - - - - - - - 4 - - - 4
O. behningi Mart. - - - - - - - - 4 1 1 10 16
O. cyprius Ludl. - - - - - - - - 2 - - - 2
Culex pipiens L. - - - - - - - - 2 - - - 2
O. mercurator Dyar. - - - - - - - - - 1 - - 1
O. sticticus Mg. - - - - - - - - - 1 - - 1
Culiseta alaskaensis Ludl. - - - - - - - - - - 1 - 1
Cs. morsitans Theob. - - - - - - - - - - 1 - 1
O. pionips Dyar. - - - - - - - - - - 2 2 4
Total: individuals of species 27 24 3 4 16 16 19 33 136 36 53 152 519
8 6 3 3 4 5 6 10 16 14 10 13 24
Table 4
The correspondence of the blood-sucking mosquitoes to different air temperatures
№ Species mosquitoes 10-15 15-20 20-25 25-30
caught °C °C °C °C
1 Complex Anopheles maculipennis Mg. 34 9 25
2 Culiseta ochroptera Peus 6 5 1 - -
3 Cs. alaskaensis Ludl. 15 6 9 - -
4 Cs. morsitans Theob. 9 1 8 - -
5 Coquillettidia richiardii Fic. 40 8 32 - -
6 Ochlerotatus sticticus Mg. 3 2 1 - -
7 O. pionips Dyar. 4 3 1 - -
8 Culex modestus Fic. 23 6 17 - -
9 O. behningi Mart. 42 19 23 - -
10 Cs. longiareolata Macq. 8 6 2 - -
11 O. leucomelas Mg. 3 - 3 - -
12 Cx. pipiens L. 2 - 2 - -
13 Aedes cinereus Mg. 2 748 313 1 557 703 175
14 Ae. rossicus D. G. M. 358 88 159 60 51
15 Ae. vexans Mg. 783 182 359 155 87
16 O. caspius Pall. 175 21 65 50 39
17 O. dorsalis Mg. 31 3 5 23 -
18 O. cantans Mg. 4 301 981 1 697 1 125 498
19 O. riparius D. K. 699 178 212 155 154
20 O. mercurator Dyar. 131 17 63 40 11
21 O. excrucians Walk. 2 772 718 929 601 524
22 O. euedes H. D. K. 606 175 204 126 101
23 O. flavescens Mull. 204 57 101 22 24
24 O. cyprius Ludl. 282 70 103 61 48
25 O. communis Deg. 384 88 172 81 43
26 O. punctor Kirby 1 930 576 593 393 368
27 O. diantaeus H. D. K. 674 92 335 181 66
28 O. intrudens Dyar. 182 31 116 29 6
29 O. cataphylla Dyar. 30 6 9 11 4
Total: of species 29 27 29 17 16
individuals 16 479 3 661 6 803 3 816 2 199
Discussion
Practically all available domestic literature characterizes the quantitative aspect of the 24-h rhythm of mosquitoes, i.e. reflects the fluctuations of their number. At the same time, the materials do not reveal the changes in the species composition of striking females over the 24-h period. The foreign literature contains some fragmented data on the ecological preferences of certain species of mosquitoes (Forat-tini & de Castro Gomes, 1988; Charlwood, 1996; Voorham, 2002; Montarsi et al., 2015; Kim et al., 2016). The study we conducted on 24-h rhythm of activity of blood-sucking mosquitoes in the conditions of the southern Tyumen oblast allowed us to reveal both the quantitative (Khlyzova & Latkin, 2015) and qualitative aspect of the issue.
In the rhythmicity of dusk-flying insects, including mosquitoes, relation to the illuminance is the most clearly manifested (Nayar & Sauerman, 1971; Chernyshev, 1981). According to Monchadskiy (1950, 1958), the periodic changes in the light over 24-h is determined by development and the main patterns of the 24-h rhythm, i.e. its qualitative aspect, and the changes in the temperature within the optimum and transitional zones influence only on the qualitative aspect of the 24-h rhythm. According to Monchadskiy (1950) and Pestryakova et al. (1976), the optimum illuminance equals 10-500 lux. In the forest-steppe zone of Tyumen Oblast, the study of the 24-h rhythm was conducted at a low level of mosquito abundance, the highest activity of mosquitoes occurred in the period of dusk, which indicates that the illuminance is one of the main limiting factors. Under the forest canopy in June, mosquitoes struck throughout the twenty-four-hour period, however, during the daytime, their number significantly decreased. In July, when the number of mosquitoes was significantly low, their strikes during the daylight hours either were not observed or the strikes were made by single individuals. Over the seasons of the study in the southern taiga and small-leaved aspen-birch forests, the number of mosquitoes was high, and the active
strikes of females on humans and animals was observed at illuminance from 0 to 3700 lux, which is 7 times higher than the border value mentioned in the literature. Some researchers mention the influence of the moon's cycle on the activity of mosquitoes, the literature describes the fact that one species were more active over the new moon phase, and the other preferred full moon (Davies, 1975; Charlwood et al., 1986; Guimaraes et al., 2000).
According to the literature data, in all landscape-climatic zones of Western Siberia, mosquitoes are active at the temperature 2-37 °C, with optimum of 7-5 °C (Anufriyeva, 1971; Kukharchuk, 1981; Red'-kina, 2008). The analysis of meteorological conditions developed during the study indicated that at relatively high temperatures in the night (not lower than 13 °C), the main factor which inhibits the intensity and the duration of the night activity at that time is mist with increased relative air humidity of up to 100%, which coincides with the data of other researchers (Haufe, 1964). Low air humidity also negatively affects the activity of mosquitoes (Guimaraes et al., 2000). We determined no negative impact of temperature 12.6-30.0 °C during the records.
One of the inhibiting factors for mosquitoes is strong wind. According to Kukharchuk (1981), their flight stopped at the wind speed of over 4 m/s. During our studies, we recorded strikes of single mosquitoes at the wind speed of 5 m/s.
Thus, apart from the main abiotic factors, the activity of mosquito females during their search of food is affected also by such biotic factors as their total number. The higher the number of mosquitoes, the harder it is for them to find food and receive the needed portion of blood. Hungry females were significantly active despite non-optimum conditions of the environment.
Conclusions
During the study of the 24-h activity of mosquitoes in southern Tyumen oblast, we recorded flight of 29 species of mosquitoes: in the subzone of the southern taiga - 25, in the subzone of small-leaved aspen-birch forests - 20, in the forest-steppe zone - 24 species. The highest species diversity of striking mosquitoes occurred in all landscape-climatic zones of southern Tyumen oblast over the period of evening flight, i.e. at 23 h. The minimum species diversity was observed in the daytime (11-17 h), when only the females of the commonest species struck actively. The pattern of 24-h activity of each species of mosquito depends on the total number of mosquitoes in the season of study and on the ecological peculiarities of the species, which is determined by the range of the main meteorological conditions optimum for its flight. For most species recorded during the study, the optimum temperature range for active flight and strikes was 15-20 °C.
This report was prepared thanks to financial support from FANO Russia within the framework of the topic FSR No 0408-2014-0025 "Current state of biodiversity of Southwest Siberia as a reflection of anthropogenic transformation of the landscape".
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