Open access peer-reviewed chapter

Karyology of the Bats from the Russian Far East

By Uliana V. Gorobeyko and Irina V. Kartavtseva

Submitted: March 22nd 2018Reviewed: May 17th 2018Published: November 5th 2018

DOI: 10.5772/intechopen.78767

Downloaded: 991

Abstract

Recent studies based on morphologic and molecular genetic data have revealed quite a serious variety in the trans-Palearctic species, which brought about taxonomic status changes in 14 of 18 Russian Far Eastern bat species. Far Eastern bat status revisions resulted in species growth whose chromosome characteristics have been described either under other names or have not been studied at all. This paper has inventoried bat chromosome research in the Russian Far East and neighboring regions and has improved the accuracy of chromosome characteristics for 17 of 18 valid species today. For the first time, the karyotypes and their variation type for the valid bat species in the Russian Far East have been described.

Keywords

  • Chiroptera
  • karyotype
  • chromosome
  • nucleolar organizer regions
  • heterochromatic material

1. Introduction

Till the middle of the twentieth century, most of the Russian bats were considered to belong to widespread Palearctic species. Since the mid-1960s, a gradual transition from the “wide” polytypic species concept appears to be replaced by the “narrow” monotypic one [1]. This is largely due to the improved morphological data processing methods [2, 3, 4] and the use of the molecular genetic [5, 6] and the karyological [7, 8, 9] methods in bat systematics. Many of the Far Eastern bat taxa were treated formerly as eastern subspecies within polytypical trans-Palearctic species. Recently, most of the Far Eastern subspecies have been elevated to a species rank, which resulted in taxonomic status changes of 14 Far Eastern bat species [56, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21]. However, the taxonomic status of certain forms needs to be clarified [22]. Most of these species are restricted to Northeast Asia, with the western species distribution bordering the Trans-Baikal and the Altai regions [22, 23].

Karyotype features are essential diagnostic characteristics of many mammalian species [24, 25]. Even species with similar diploid number (2n) and chromosome morphology have been shown to differ significantly in distributional patterns of nucleolar organizer regions (NOR) [26, 27, 28, 29] and the amount and location of heterochromatic material on chromosomes [30, 31, 32, 33, 34].

Bats are characterized by high level of karyotype stability at the genus and low intraspecific chromosomal variability, e.g., in MyotisKaup, 1929; EptesicusRafinesque, 1820; VespertilioLinnaeus, 1758; BarbastellaGray, 1821; PlecotusGray, 1866 [7, 35, 36, 37, 38, 39].

The so-called Myotis-typekaryotype with 2n = 44 and fundamental number (NFa) being 50 is accepted to be the ancestral karyotype of family Vespertilionidae Gray, 1821 [37]. The chromosomal arms are usually numbered using Bickham’s scheme, in which ordinal numbers have been assigned to all the autosomal arms based on GTG-banding patterns [40].

The position and number of the nucleolus organizer regions (NORs) and the amount and location of heterochromatic material (C-band) on chromosomes of many vespertilionid species have been shown to represent species-specific characteristics. The sequential staining methods (G-band; NOR; С-band) revealed karyological differences in species of the same karyotype [7, 8, 39, 41, 42, 43, 44, 45].

Chromosomal studies of the Far Eastern bats were initiated by N.N. Vorontsov [35] and continued by his colleagues and students [46, 47, 48, 49]. The conventional staining of 10 bat species karyotypes was described. Differential staining (NOR and С-band) was reported for two species, Plecotus ogneviKishida, 1927 and Eptesicus nilssoniiKeyserling & Blasius, 1839.

Species composition revision of the Far Eastern bats caused an increase in the number of species, whose chromosomal characteristics were reported either under the wrong species names or were not studied at all.

The paper presents an inventory of available karyological data on bats from the Russian Far East and neighboring regions. It provides revision of specified chromosomal characteristics of 18 valid bat species from the Russian Far East. The karyotype descriptions of valid Far Eastern bat species and their chromosomal variability are given for the first time.

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2. Karyotypes of Far Eastern bat

Table 1 shows valid Russian Far Eastern bat species. The columns represent species belonging to geographically various regions. The last one gives the species names describing the karyotypes. The table demonstrates the level of karyological knowledge available of certain bat species in every region studied. European and Northeastern Asian karyotype species have been studied to the fullest extent possible. Less data have been obtained regarding karyotype species in Siberia and the Russian Far East.

To illustrate the intrageneric and intraspecific variability of the Russian Far Eastern bat karyotypes based on data available, Table 2 is drawn, which made it possible to compare chromosome characteristics of a similar Far Eastern bat species from different geographic regions for the first time and to reveal availability or lack of this variability. For simplicity sake, three size groups have been introduced to analyze size variability of two-arm (M-SM) chromosomes: large, medium-sized, and small ones, with their respective karyotype numbers assigned. This allowed us to show the karyotype variability based on this feature. Besides, Table 2 also shows the previous study of the species by using different sequential staining methods for the chromosomes, thus making it possible to differentiate species with a similar chromosome formula.

Integrated data on the karyotypes, extent of their studies, and chromosome variability of the Russian Far Eastern bats are provided below.

2.1. Family Vespertilionidae Gray, 1821: common bats

2.1.1. Genus MyotisKaup, 1829: mouse-eared bats

All Myotisspecies have similar karyotypes: 2n = 44 [7, 35, 39, 42, 46]. The fundamental arms number varied from 50 to 52 in different studies. This is due to the fact that some authors accounted for short euchromatic arms on the seven autosomal pairs [7, 39], while the others described this one as an acrocentric [41, 43, 46, 47, 48, 54, 55, 56, 57]. For some authors, NFa also covered the additional heterochromatic short arms on 24 or 25 pairs of acrocentrics [41, 43, 52, 53, 55, 57]. The species of genus Myotisshowed the centromere-cap NORs (cmcNORs), with the distributional pattern of NORs in Myotiskaryotype being species-specific [7, 39, 42].

The amount and location of C-band in Eurasian Myotischromosomes varies intra- and interspecifically [39, 41, 43, 54, 55]. Eurasian Myotisspecies proved to have small heterochromatic segments close to the centromere on most of the chromosomal arms. Certain Myotisspecies show a distinct intercalary heterochromatic segments found in the proximal part of chromosome 15, in the vicinity of the centromere on chromosomal arm 16, and in the short arm of the X-chromosome adjacent to the centromere [39]. The size and morphology of Y-chromosome were species-specific and depended on amount of heterochromatic material in chromosome [39]. Asian bat species karyotypes have a distinctly pronounced totally heterochromatic short arm on one of the dot-like chromosomes 24 and 25. There might be a tiny second arm in several species or a large heterochromatic secondary arm of the same size as the euchromatic arm [39, 41, 43].

The genus Myotisis the most frequently found bats genus in the Russian Far East, with seven recorded species. Of these, six species are also spread in Northeast Asia and five species are common in Siberia. Karyotype of one species was reported found in Siberia. The karyotypes of four Myotisspecies studied are common for the Russian Far East. The karyotypes of five Myotisspecies were described from Northeast Asia.

M. bombinusThomas, 1906.The karyotypes were described from Japan species. The cmcNORs were shown to be located in 11 autosomal pairs: from 7 to 15, 19, and 22. The heterochromatic short arms on chromosome 25 of M. bombinuswere tiny or absent at all [41].

M. ikonnikoviOgnev, 1912.The karyotypes were reported from Japan and the Russian Far East. It was shown that the cmcNORs were located in 7, 13, 14, 22, and 23 autosomal pairs. Intraspecific variability is likely to exist here regarding the large heterochromatic short arms on the 25 autosomal pairs [41].

M. longicaudatusOgnev, 1927.The karyotype was studied using the Japan species. The cmcNORs were located on 13 autosomal pairs: from 8 to 11, from 13 to 15, and from 18 to 23. The morphology of Y-chromosome seems to vary from acrocentric [41] and subtelocentric [43] to submetacentric [55]. The morphology of chromosome 25 appears to vary from acrocentric to submetacentric due to the presence or absence of heterochromatic short arms [41, 43].

M. macrodactylus(Temminck, 1840).The karyotype was described using Northeast Asia and the Russian Far East specimens (Figure 1). The cmcNORs were located on 18–23 autosomal pairs. The morphology of chromosome 25 seems to vary from acrocentric chromosome in M. macrodactylusfrom the Russian Far East [46], Korea [58], and Japan [54] to metacentric chromosome in other Japanese M. macrodactylus[41, 43, 53, 55, 56]. The presence of one B-chromosome for M. macrodactylusfrom Japan has been showed [56].

Figure 1.

Karyotype ofMyotis macrodactylusfrom the Russian Far East [our data].

M. petaxHollister, 1912.The conventionally stained karyotype of M. petaxwas studied from Korea and the Russian Far East. The Korean and Far Eastern M. petaxappeared to differ by a number of small biarmed chromosomal pairs.

M. sibiricaKaschenko, 1905.The routinely staining karyotype was described from Siberia and the Russian Far East. No pronounced differences in the karyotypes of Siberian and Far Eastern M. sibiricahave been found.

M. gracilisOgnev, 1927.The conventionally stained karyotype of M. graciliswas studied from Korea.

So, out of seven Far Eastern species, Myotiskaryotype has been studied for all of them. Although all Myotisspecies have similar karyotypes with 2n = 44, the distributional pattern of NORs and the amount and location of heterochromatic material in the karyotype are the most important differentiating characteristics for the Myotisspecies. Various levels of the data studied for differently staining Myotischromosomes from various Northeastern regions make it impossible to do species comparative analysis based on the above features.

2.1.2. Genus PlecotusGray, 1866: Old World long-eared bats

The species of genus Plecotusare characterized by a karyotype with 2n = 32, NFa = 50 [43, 47, 49, 66]. The distributional pattern of NORs is a centromere-cap NOR (cmcNORs) [42, 43, 47].

There are two species of Plecotusin the Russian Far East: P. ogneviand P. sacrimontis.

P. ogneviKishida, 1927.The karyotype of P. ogneviwas described from the Russian Far East (Figure 2). Four NORs were found belong to acrocentric chromosomes of P. ognevi; but it was impossible to determine the numbering of these chromosomal arms according to Myotis-typekaryotype because of G-banding failure [47]. The distributional patterns of heterochromatic material in karyotype were shown: large heterochromatic segments were found in all biarmed autosomal pairs, while small C-band emerged in the most acrocentric chromosomes except the first pair [47].

Figure 2.

Karyotype ofPlecotus ognevifrom the Russian Far East. The figure was previously published in our paper, see [49].

G-staining, Q-banding, and Zoo-FISH of Siberian P. ognevikaryotypes were studied. A pericentric inversion or centromere shift on the smallest metacentric P. ognevichromosome 16/17 using the HSA 16 probe was revealed, which accounted for the differences between G-banding patterns and the homologous Myotisspecies chromosome [51].

P. sacrimontisG. Allen, 1908. Karyotype of P. sacrimontiswas reported from Northeast Asia. NORs were located on chromosomes 20, 22, 23, and 24 [43], while the European species P. auritusLinnaeus, 1758 showed NORs on 20, 22, 24, and 25 autosomal pairs [42].

So, all Plecotusspecies have similar karyotypes with 2n = 32, NFa = 50. P. auritusand P. sacrimontishad different NORs distribution on chromosomes. For P. ognevi, it was impossible to determine the numbering and NOR location on chromosomal arms. Heterochromatic distribution pattern in karyotype was studied only for P. ognevifrom the Russian Far East, thus making it impossible to compare data from various species and regions.

2.1.3. Genus Barbastella Gray, 1821: barbastelles

Karyotype of Barbastellais similar to that of the Plecotuskaryotype: 2n = 32, NFa = 50. The distributional pattern of NORs is cmcNORs [43].

There is only one species of genus Barbastellain the Russian Far East—B. darjelingensisHodgson, 1855. It can be found exclusively on the island of Kunashir [23, 78]. The chromosomal set was reported only from B. darjelingensisfrom Northeast Asia. Five NORs were found on 21–25 autosomal pairs of standard Myotis-typekaryotype [43].

2.1.4. Genus Pipistrellus Kaup, 1829: pipistrelles

The genus Pipistrellusis characterized by considerable variability of 2n and NFa [35].

There is one pipistrelles species inhabiting the Russian Far East, i.e., P. abramusTemminck, 1840.Karyotype of P. abramuswas described from Northeast Asia. Unlike other pipistrelles, P. abramushas low number 2n and NFa (2n = 26, NFa = 44) due to centric fusions. Chromosome rearrangements complexity makes it impossible to identify the chromosomal arms by G-banding that were involved in composition of 5 out of 10 biarmed pairs of P. abramuskaryotype. Therefore, the numbering of P. abramuschromosomes differs from Myotis-typekaryotype [43, 54, 63, 65].

The distributional pattern of NORs is interstitial (intNORs). The large NOR was located in secondary constriction (SC) of five metacentric pairs consisting of 14 and 7 autosomal pairs of Myotis-typekaryotype [43].

The intraspecific variations of sex chromosomes in karyotype of especially P. abramuswere likely to be found. Many researchers identified X chromosome morphology as a medium-sized acrocentric, while the X chromosome of the P. abramusfrom Fukuoka prefecture (Japan) was described as subtelocentric [54]. The Y chromosome of P. abramuswas usually characterized as the smallest acrocentric, while the Y chromosome of the same species from Gunma prefecture (Japan) was described as a small metacentric [52].

High intraspecific variability of heterochromatic material seems to be specific of the P. abramuskaryotype. This variability for P. abramusfrom Northeast Asia is presented in Table 3.

Valid speciesFormerly named in sources
EuropeSiberiaRussian Far EastNortheast Asia
Myotis nattereriEMyotis bombinusNoMyotis bombinusNoMyotis bombinusJMyotis nattereri
Myotis ikonnikoviNoMyotis ikonnikoviFEMyotis ikonnikoviJMyotis ikonnikovi
Myotis longicaudatusNoMyotis longicaudatusNoMyotis longicaudatusJMyotis frater
Myotis capacciniiEMyotis macrodactylusFEMyotis macrodactylusJ KMyotis capaccinii
Myotis daubentoniiEMyotis daubentoniiNoMyotis petaxFEMyotis petaxKMyotis daubentonii
Myotis petaxNo
Myotis brandtiiEMyotis brandtiiNoMyotis gracilisNoMyotis gracilisKMyotis brandtii
Myotis sibiricaSMyotis sibiricaFE
Plecotus auritusEPlecotus ogneviSPlecotus ogneviFEPlecotus sacrimontisJPlecotus auritus
Plecotus auritusNoPlecotus sacrimontisNo
Barbastella darjelingensisNoBarbastella darjelingensisJBarbastella leucomelas
Pipistrellus abramusNoPipistrellus abramusJ C KPipistrellus abramus
Vespertilio murinusEVespertilio murinusSVespertilio murinusFEVespertilio murinusnoVespertilio murinus
Vespertilio sinensisNoVespertilio sinensisFEVespertilio sinensisJVespertilio orientalis
Hypsugo saviiEHypsugo alashanicusFEHypsugo alashanicusKPipistrellus savii
Eptesicus nilssoniiEEptesicus nilssoniiNoEptesicus nilssoniiFEEptesicus nilssoniiJEptesicus nilssonii
Murina ussuriensisNoMurina ussuriensisJMurina aurata
Murina hilgendorfiSMurina hilgendorfiFEMurina hilgendorfiJMurina leucogaster
Miniopterus schreibersiiEMiniopterus fuliginosusNoMiniopterus fuliginosusJ C T MMiniopterus schreibersii

Table 1.

Valid species of the Far Eastern bats and their karyological studies.

Notes: The geographical regions with the names abbreviated karyotypes investigated: E—Europe, S—Siberia, FE—Far East, J—Japan, C—China, K—Korea, T—Thailand, M—Malaysia.

Sources for species of Europe: [7, 39, 42, 44, 50], of Siberia: [47, 51], of the Far East—see Table 2. “no”—unknown.

Valid speciesSpecies named in sourcesReg2nNFaM-SM (large + medium + small)STAXYNORDiff. stain.NRef.
Vespertilionidae Gray 1821—common bats
Myotis bombinusM. nattereriJ44503 + 0 + 117SMC1f[41]
M. n. bombinusJ44503 + 0 + 117MA11 cmcC, G1m[43]
Myotis ikonnikoviM. hosonoiJ44525 + 0 + 016SMA1m[52]
M. hosonoiJ44523 + 0 + 216SMA2m 1f[53]
M. hosonoiJ44503 + 0 + 117SMAC, G10m 14f[41]
M. hosonoiJ44503 + 0 + 117M-SMC, G, Q5m 3f[54]
M. ikonnikoviFE44503 + 0 + 117SM1f[47]
M. hosonoiJ44523 + 0 + 216MA5 cmcG2m 1f[43]
Myotis longicaudatusM. frater kaguyaeJ44503 + 0 + 216SMAC, G6m[41]
M. fraterJ44*50M-SMSMС[55]
M. fraterJ44503 + 0 + 117M-SMC, G, Q3m 4f[54]
M. fraterJ44523 + 0 + 216MST13 cmcC, G3m 4f[43]
Myotis macrodactylusM. capacciniiFE44503 + 0 + 117MA1m[46]
M. macrodactylusJ44523 + 0 + 216SMA2m 2f[53]
M. macrodactylusJ44 + B523 + 0 + 216SMA5m 5f[56]
M. macrodactylusK44503 + 0 + 117SMA2m 3f[57]
M. macrodactylusJ44523 + 0 + 216SMAC, G4m 6f[41]
M. macrodactylusJ44503 + 0 + 117M-SMC, G, Q8m 2f[55]
M. macrodactylusJ44523 + 0 + 216M-SMSMC[54]
M. macrodactylusK44523 + 0 + 216M-SMM-SM5m[58]
M. macrodactylusJ44523 + 0 + 216MA6 cmcG7m 5f[43]
Myotis petaxM. daubentoniiFE44*503 + 0 + 117MA1m 2f[47]
M. daubentoniiK44523 + 0 + 216MA2m[58]
Myotis sibiricaM. brandtiiS44*503 + 0 + 117MA2m[47]
M. brandtiiFE44*503 + 1 + 017MA1m 1f[48]
Myotis gracilisMyotis mystacinus gracilisK44503 + 0 + 117M-SMA2m[58]
Plecotus ogneviP. auritusFE32509 + 0 + 15SM4С1f[47]
P. auritusS32509 + 0 + 15SMAG, Q, FISH1m[51]
P. ogneviFE32509 + 0 + 15SMA1m[49]
Plecotus sacrimontisP. auritus sacrimontisJ32509 + 0 + 15SMA2f[53]
P. a. sacrimontisJ32*1m 1f[59]
P. a. sacrimontisJ32509 + 0 + 15MA4 cmcG1m 3f[43]
Barbastella darjelingensisB. leucomelas darjelingensisJ3250105SMА1m[60]
B. leucomelasJ3250105SMA[61]
B. l. darjelingensisJ32509 + 0 + 15MA5 cmcG2m 1f[43]
Pipistrellus abramusP. abramusJ26446 + 4 + 02AM2m[52]
P. abramusJ26446 + 4 + 02AA3f[53]
P. abramusJ26446 + 4 + 02AAG4m 3f[62]
P. abramusJ26*1m 1f[59]
P. abramusJ264410 + 0 + 02AAC[55]
P. abramusJ26446 + 4 + 02STC, G, Q3m 7f[54]
P. abramusK26448 + 0 + 022AA1m[58]
P. abramusJ264410 + 0 + 02AA1 intC, G7m 3f[43]
P. abramusC264410 + 0 + 02AAC, G9m 6f[63]
P. abramusC264410 + 0 + 02AA2m 2f[64]
P. abramusC264410 + 0 + 02AAC, G1m 7f[65]
Vespertilio murinusV. murinusS38506 + 0 + 111MA2m[35]
V. murinusE38506 + 0 + 111MG, Q1m 1f[66]
V. murinusE38*502 int1m[42]
V. murinusFE38*506 + 0 + 111M1f[47]
V. murinusS38506 + 0 + 111MAG, Q, FISH1m[51]
V. murinusFE38506 + 0 + 111MA1m 1f[49]
Vespertilio sinensisV. superansFE38506 + 0 + 111MA3m 2f[35]
V. orientalisJ38506 + 0 + 111SMA[61]
V. orientalisJ38506 + 0 + 111SMAC3m 7f[67]
V. superansJ38506 + 0 + 111M-SMAC[55]
V. superansJ38546 + 0 + 39SMDotC, G5m 5f[68]
V. orientalis3m 5f
V. superansFE38*506 + 0 + 111MA2m 2f[47]
V. superansJ38506 + 0 + 111MA2 intG3m 5f[43]
V. superansJ38506 + 0 + 111MAC, T, Q, FISH1m[69]
Hypsugo alashanicusP. savii koreensisK44503 + 0 + 117M2f[57]
P. saviiFE44*503 + 0 + 117M1f[47]
P. koreensisK44503 + 0 + 117M-SMA3m[58]
Eptesicus nilssoniiE. parvusJ50481f[59]
E. nilssoniiE50*4824[70]
E. nilssoniiFE504824M1 intС2f[47]
E. nilssoniiJ5048[71]
E. n. parvusJ5050123M-SMAT, Q, FISH2m 1f[69]
E. nilssoniiFE50*4824MA1m 1f[48]
E. nilssoniiE504824M-SM1 intG1f[44]
Murina hilgendorfiM. leucogaster hilgendorfiJ44503 + 0 + 117MA1m[53]
M. leucogasterJ44583 + 0 + 1413SMA[60]
M. l. hilgendorfiJ44563 + 0 + 1314SMAC, G2m[72]
M. leucogasterFE44502 + 1 + 117SMA1m[47]
M. hilgendorfiS44563 + 0 + 1314SMAG, Q, FISH1m[51]
Murina ussuriensisM. aurataJ44603 + 0 + 2412SMA[61]
Murinus auratus ussuriensisJ44503 + 0 + 117MA1m[59]
M. aurata ussuriensisJ44563 + 0 + 1314SMAC, G1m 1f[72]
M. sylvaticaJ44563 + 0 + 1314num. cmc1m 2f[43]
Miniopteridae Dobson 1835—Bent-winged Bats
Miniopterus fuliginosusM. schreibersii fuliginosusJ46522 + 1 + 118SMA3m 1f[73]
M. s. fuliginosusJ46522 + 1 + 118SMA8m 6f[53]
M. schreibersiiM46502 + 0 + 119SMA1m 1f[74]
M. s. haradaiT46522 + 1 + 0118SMA2m[70]
M. s. fuliginosusJ46502 + 0 + 119MA1cmc 1intG1m 1f[43]
M. schreibersiiT46502 + 0 + 119SMA1f[75]
M. fuliginosusC46502 + 0 + 119SMAG, FISH[76]
M. fuliginosusC46502 + 1 + 019SMC, G1f[77]
M. schreibersiiC46502 + 1 + 019SMA1m[65]

Table 2.

Far Eastern bats karyological data.

The chromosome image is not shown at the sources; “–“, no data.


Columns: reg.—geographical regions, M-SM—number of biarmed chromosome pairs (size: large + medium + small); Diff. stain.—differential staining of chromosome (G, C, etc.); NOR—AgNOR-banding (cmc—centromere-cap NORs, int—interstitial NORs); N—number of specimens examined (f—female, m—male); Ref.—literature sources.

Morphology of chromosomes: M—metacentric, SM—submetacentric, M-SM—biarmed, ST—subtelocentric, A—acrocentric, dot—dot-like chromosome.

Geographical regions abbreviations: E—Europe, S—Siberia, FE—Far East, J—Japan, C—China, K—Korea, T—Thailand, M—Malaysia.

2nNFaNo. chromosomal armsReg.Ref.
123456789101112XY
2644+++++++++J[55]
2644++++++++J[54]
2644++++J[43]
2644+++++++++++C[63]
2644+++++++C[65]

Table 3.

Intraspecific variations of heterochromatic material in karyotypes of Pipistrellus abramus.

Note: ○—totally euchromatic chromosomes; +—heterochromatic band in vicinity of the centromere; ●—totally heterochromatic chromosomes.

Geographical regions abbreviations: J—Japan, C—China.

The P. abramuskaryotype is described only from Northeastern Asia specimens, which can be possibly accounted for by existing intraspecific variability based on morphology of sex chromosomes, number and localization of structural heterochromatin in karyotype.

2.1.5. Genus Vespertilio Linnaeus, 1758: particolored bats

All specimens of genus Vespertilioshowed the karyotypes with 2n = 38, NFa = 50 [35, 44, 79]. All Vespertiliospecies showed location of two large intNORs in the SC of 15 and 23 autosomal pairs [42, 43]. There are two Vespertiliospecies in the Russian Far East—V. murinusand V. sinensis.

V. murinusLinnaeus, 1758is the trans-Palearctic bat species, whose karyotype was described from Europe, Siberia, and the Russian Far East. The NOR distributional pattern was reported from Europe [42]. The chromosome characteristics show stability across the entire area of its distribution (Figure 3).

Figure 3.

Karyotype ofVespertilio murinusfrom the Russian Far East. The figure previously was published in our paper, see [49].

V. sinensisPeters, 1880belongs to the East Asian bat species. The karyotype was described from Northeast Asia and the Russian Far East. NFa = 54 was shown to characterize some specimens from Japan, probably due to the fact that certain researchers included small heterochromatic secondary arms on the two smallest acrocentric in NFa [68]. The distributional pattern of NORs was reported from Northeast Asia [43]. The significant intraspecific polymorphism seems to exist in regard to amount and location of heterochromatic material in karyotype of Japanese V. sinensis(Table 4).

2nNFaNo. chromosomal armsRef.
1/23/45/613/711/89/ 1016/ 171214*151819202122*232425XY
3850int+++++++[67]
3850++++++++++++[55]
3854+ int++ int+++++++ int+++++++[68]
3850+++ int+ int+++++ int+++++++[69]

Table 4.

Intraspecific variations of heterochromatic material in karyotypes of Japanese Vespertilio sinensis.

Note: ○—totally euchromatic chromosomes; +—heterochromatic band in vicinity of the centromere; ●—totally heterochromatic chromosomes; *—secondary construction on the chromosome.

The localization of telomeric sequences (TTAGGG)n was described by FISH for V. sinensisfrom Japan. Hybridization signals were observed at both ends of all V. sinensischromosomes along with very faint and small-sized interstitial signals that were also present at centromeric sites of all seven biarmed chromosomes. Large and intense hybridization signals revealed themselves at the centromeric regions in eight pairs of acrocentric autosomes (18–25) and the Y chromosome of V. sinensis.It is interesting to note that C-band of the smallest acrocentric pair 25 and of the Y chromosome displayed a complete hybridization, while interstitial C-band in 5/6, 7/13, and 15 autosomal pairs in V. sinensisexhibited no hybridization. Internal telomeric sequences were observed in the heterochromatic regions or satellite DNA on chromosomes that may indicate recent chromosomal rearrangements occurred in the evolution process [69].

While the chromosome characteristics of V. murinusshow stability across the entire area of its distribution, the karyotype of V. sinensisseems to have a significant intraspecific polymorphism regarding the content of structural heterochromatin in the karyotype.

2.1.6. Genus Hypsugo Kolenati, 1856: high pipistrelles

The diploid number and fundamental number of genus Hypsugochromosomes noticeably vary due to the centric fusions as well as inversions and centromere shift [44]. The Hypsugospecies show both intNORs and cmcNORs. The H. saviiBonaparte, 1837 (2n = 44, NFa = 50) and H. eisentrauti(Hill, 1968) (2n = 42, NFa = 58) exhibit only one intNORs in SC of chromosome 15, while H. crassulusThomas, 1904 (2n = 30, NFa = 56) possesses cmcNORs on chromosomes 3 and 19 and in proximal part of chromosome 15/25 [44].

There is only one Hypsugospecies found in the Russian Far East—H. alashanicusBobrinskoy, 1926. This karyotype was described from Northeast Asia and the Russian Far East 2n = 44, NFa = 50.

2.1.7. Genus Eptesicus Rafinesque, 1820: serotines

Karyotypes of all autosomes belonging to Eptesicusspecies can be characterized as acrocentric: 2n = 50, NFa = 48 [8, 36, 44].

There is only one Eptesicusspecies found in the Russian Far East—E. nilssoniiKeyserling & Blasius, 1839. E. nilssoniispecies distribution is trans-Palearctic. The karyotype of E. nilssoniiwas reported from Europe, Northeast Asia, and the Russian Far East (Figure 4). 2n and NFa are the same for most of the studied E. nilssoniiexcepting this one from Hokkaido with one biarmed autosomal pair in karyotype [69]. The large intNORs is located on secondary constriction in chromosome 15 [44, 47].

Figure 4.

Karyotype ofEptesicus nilssoniifrom the Russian Far East. The figure previously was published in paper [48].

The amount and location of heterochromatic material in karyotype was described for E. nilssoniifrom the Russian Far East. There were small C-bands on all chromosomes pairs, and the fourth largest pair showed a large interstitial heterochromatic segment. The SC on chromosome 15 showed C-band [47].

The chromosome characteristics of E. nilssoniiincluding distributional pattern of NORs show stability across the entire area of its distribution. Structural heterochromatin distribution pattern was studied only for the Far Eastern E. nilssonii, which prevented us from evaluating variability of this feature.

2.1.8. Genus Murina Gray, 1842: tube-nosed bats

The karyotypes of tube-nosed bats do not differ from 2n = 44 [72, 80, 81], while NFa varies from 50 to 60 probably due to subtelocentric pairs produced by the pericentric inversions [771, 79]. The distributional pattern of NORs is cmcNORs [43, 80]. There are two Murinaspecies in the Russian Far East, which are M. hilgendorfiand M. ussuriensis.

M. ussuriensisOgnev, 1914. Karyotype of M. ussuriensiswas described from Japan. With the known localization type, the localization of multiple cmcNORs on chromosomes has not been determined yet because G-banding has not been done [43].

The amount and location of heterochromatic material in M. ussuriensiskaryotype were described from Japan. The autosomal pairs 5/6, 16/17, 20, 24 and X chromosome showed small centromeric C-bands, while the Y chromosome was totally heterochromatic. The interstitial faintly stained C-band was revealed in the distal part of X chromosome [72].

M. hilgendorfiGray, 1842.Karyotype of M. hilgendorfiwas described from Siberia, Northeast Asia, and the Russian Far East region (Table 2).

Karyotype of one specimen from Primorsky Velican cave (the Russian Far East) was clearly different from other M. hilgendorfiones by the number of large biarmed pairs: there were only two large metacentric pairs, one medium-sized submetacentric pair being approximately equal to a long arm of large metacentric pair and one small metacentric pair [47]. The same karyotype was previously described for a tube-nosed bat from Thailand [70]. It was originally reported as M. leucogasterMilne-Edwards, 1872, though later the bat was redefined as M. harrisoniCsorba & Bates, 2005 [82]. However, karyotypes of other specimens of M. harrisoni[81, 83] and M. leucogaster[84] exhibited karyotype with three large biarmed chromosomal pairs.

The amount and location of heterochromatic material in karyotype were shown for M. hilgendorfifrom Japan. There were small C-band close to centromere on chromosomes 5/6, 16/17, 20, 24 and X chromosome with totally heterochromatic Y chromosome [72].

The location of structural heterochromatin of M. ussuriensisand M. hilgendorfifrom Japan scarcely differs from each other. M. hilgendorfikaryotype with two large metacentric pairs, one medium-sized submetacentric pair and 1 small metacentric pair described from the Russian Far East, seemed to be either in error or an isolated case that requires verification.

2.2. Family Miniopteridae Dobson, 1875: bent-winged bats

2.2.1. Genus Miniopterus Bonaparte, 1837: bent-winged bats

Karyotypes of bent-winged bats are clearly different from standard Myotis-typekaryotype due to chromosomal rearrangements. By using GTG-staining and FISH methods, the biarmed chromosome 3/4 of Myotis-typekaryotype was shown to be similar to two acrocentric pairs of Miniopterus,due to centric fissions the metacentric pair 16/17 assumed the shape of an acrocentric, and the acrocentric pair 12 became biarmed due to pericentric inversions, with the G-banding pattern of 7 and 10 autosomal arms being different from standard Myotis-typekaryotype [76].

There is one species of the monotypic family Miniopteridae found in the Russian Far East that is M. fuliginosusHodgson, 1835. Karyotype (2n = 46, NFa = 50–52) was described from Northeast Asia.

The M. fuliginosusseems to exhibit intraspecific polymorphism by the number of biarmed autosomal pairs. Karyotype with two large and one small biarmed pairs is most common. M. fuliginosus, with its mostly encountered karyotype, was found in Malaysia, Thailand, China, and Japan [43, 74, 75, 76]. Karyotype with two large and one medium biarmed chromosomal pair was described from China [65, 77]. Karyotype of M. fuliginosusfrom Thailand was similar to the previous one with one exception: it had one subtelocentric pair [71]. Karyotype with two large, one medium, and one small biarmed pairs was described from Japan [53, 73].

One cmcNORs was shown to be located on 20 autosomal pair and one intNOR is located on chromosome 23 in the M. fuliginosus karyotypefrom Japan [43]. The small C-band close to centromere was described to be located on all chromosomal pairs of Chinese M. fuliginosus[77].

So, M. fuliginosusfrom Northeastern Asia seems to be characterized by intraspecific chromosome polymorphism based on the number of autosomal pairs.

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3. Conclusion

For the first time, the references’ analysis undertaken enabled us to demonstrate the extent of chromosome characteristics studied for bats from the Russian Far East. It also illustrated the nature of the intrageneric and intraspecific chromosome variability of the bats from the Russian Far East.

The data available enable us to suggest Miniopterus fuliginosus, Murina hilgendorfi,and some Myotisspecies to show intraspecies chromosome polymorphism regarding biarmed autosomal pairs. Intraspecies variability could be fairly assumed to exist as regards X,Y chromosomes in P. abramus, M. longicaudatusand M. macrodactyluskaryotypes from Northeastern Asia. A significant intraspecies polymorphism regarding structural heterochromatin in a karyotype seems to be available in V. sinensis, P. abramus,and Myotisspecies. Such important characteristic as the amount and localization of cmcNORs on chromosomes has been very irregularly studied for the Far Eastern bat species, which restricts our ability to compare data from different regions. There is not enough data to compare Barbastellaand Hypsugospecies in terms of their karyotype chromosome characteristics.

Thus, one might make a conclusion that karyotypes of the majority bats from the Russian Far East and Siberia still remain to be studied. The bats from Northeastern Asia and Europe have their bats’ chromosome characteristics somewhat more fully explored, though we still have considerable gaps in our knowledge of karyotypes for certain bats’ species.

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Acknowledgments

The reported study was funded by the Russian Foundation for Basic Research according to the research project № 18-34-00285.

© 2018 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Uliana V. Gorobeyko and Irina V. Kartavtseva (November 5th 2018). Karyology of the Bats from the Russian Far East, Cytogenetics - Past, Present and Further Perspectives, Marcelo Larramendy and Sonia Soloneski, IntechOpen, DOI: 10.5772/intechopen.78767. Available from:

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