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Karyotypes and Cellular DNA Contents of Three Species of the Subfamily Clupeinae

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Karyotypes and Cellular DNA Contents of Three Species of the Subfamily Clupeinae Japanese Journal of Ichthyology 魚 類 学 雑 誌 Vol.38,No.3 1991 38巻3号1991年 Karyotypes and Cellular DNA Contents of Three Species of the Subfamily Clupeinae Hitoshi Ida, Noboru Oka and Ken-ichi Hayashigaki hool of Fishery Sciences,Kitasato University,Sanriku-cho, Sc Kesen-gun, Iwate Pref. 022-01, Japan Abstract Karyotypesof three species of the subfamilyClupeinae collected from northern Japan were analyzed by in vitro methods and their cellular DNA contents were measured using an integrating microdensitometer.Sardinella zunasi and Sardinopsmelanostictus show very similar karyotypes:2n=48, consistingof acrocentric or subtelocentricchromosomes with a gradual decreasein chromosomesize, but with differencesin cellular DNA of2.32and2.69pg/cell respectively. Clupeapallasii differsfrom the aforementionedspecies in karyotype:2n=52, consistingof 6 metacentricor submetacentricchromosomes and 46 acrocentric or subtelocentricchromosomes, with a cellular DNA content of 1.96pg/cell. The results showed two different modes in karyological evolution within the subfamily Clupeinae,i.e. an increase of cellular DNA content without apparent change in karyotype,as shown by Sardinellazunasi and Sardinops melanostictus,and less change in cellular DNA content but with marked change in karyotype, as shown by Clupeapallasii. The family Clupeidae comprises about 180 species ture. Details of the material are shown in Table 1. which are divided into five subfamilies. Information or chromosomal study, a short term tissue cul-F on the karyotype and DNA content of the family has ture method was adopted. Gill filaments removed been reported for no more than 19 species of three from the right side gill arch of live fish were incu- subfamilies (Ohno and Atkin, 1966; Roberts, 1966; bated in minimum essential medium (MEM) solution Ohno et al., 1968; Mayers and Roberts, 1969; Hine- with0.1-0.2mcg/ml colcemid, for2-6hours at15- gardner and Rosen, 1972; Rishi, 1973; Skvortsova, 20•Ž. After incubation, the gill tissues were treated 1975; Krysanov, 1978; Khuda-Bukhsh, 1979; with hypotonic solution (0.075 M KCI) for about 1 Vasil'yev,1980;Fitzsimons and Doucette,1981; hour and then fixed in Carnoy's fixative for at least 1 Doucette and Fitzsimons,1988).However, most of hour. Chromosome spreads were prepared accord- these studies are descriptions of the karyotypes, and ing to the method described by Ida et al. (1982). the evolutionary pattern estimated from karyological Karyotypic data were obtained from photographic modification of the family has yet to be studied. negatives. Negatives of chromosome spreads were We analyzed karyotypes and DNA contents of projected on a NIKON PROFILE PROJECTOR three species of the subfamily Clupeinae, i.e., Sardin- V-12 and the arm lengths of chromosomes were ella zunasi, Sardinops melanostictus and Clupea pal- measured to the nearest0.1gm by a NIKON The former two species are studied for the first DIGITAL COUNTER DP-851. The classification time and the latter species is reported for the first of chromosomes followed Levan et al. (1964). time from Japanese waters. Details of their karyo- Fundamental number (FN) was established by as- logical aspects are described below and evolutionary signing a value of one to all subtelocentric and acro- patterns in the subfamily are estimated from the data centric chromosomes, and a value of two to all of karyotypes and DNA contents so far reported. metacentric and submetacentric chromosomes. New Arm Number (NAN) was determined following Materials and methods Arai and Nagaiwa (1976). Calculation of the per- centage of the length of each chromosome of the Fish specimens used for this study were collected total complement length (%TCL) followed Dou- from Tokyo Bay, Tokyo and Okirai Bay, Sanriku-cho, cette and Fitzsimons(1988)who modified Iwate Prefecture. Clupea pallasii were one year old LeGrande's(1975)definition of %TCL. Species offspring from parents collected off Ibaraki Prefec- identification followed Whitehead(1985). •\ 289•\ 魚類学雑誌 Japan. J. Ichthyol.38(3),1991 For the measurement of DNA content, red blood Sardinella zunasi (Fig.1A):The sharp modal cells obtained from each specimen were stained ac- count of 2N=48indicated the diploid number for cording to the Feulgen technique (Macgregor and this species. The karyotype was composed of 48 Varjley, 1983), and were measured by an integrating acrocentric or subtelocentric chromosomes, and microdensitometer, NIKON VICKERS M-85A. both the fundamental number and new arm number The cellular DNA content was measured relative to were 48(Table3). The size of chromosomes de- that of red blood cells of the common carp, Cyprinus creased gradually. The%TCL ranged from 1.3to carpio. 3.0, with a standard deviation of 0.37 (Table3). The distribution of %TCL is shown in Fig.2A. The Results DNA content of this species was 2.32pg/cell (Table 3), with a standard deviation of0.43. The distribution of chromosome counts obtained Sardinops melanostictus (Fig.1B):The sharp for the three species is given in Table 2. modal count of2N=48 indicated the diploid number There was no difference in karyotype between for this species. The karyotype was composed of 48 males and females in all species. Chromosomal acrocentric or subtelocentric chromosomes, and counts below the modal numbers are probably at- both the fundamental number and new arm number tributable to a loss of chromosomes during prepa- were 48(Table3). The size of chromosomes de- ration. creased gradually. The %TCL ranged from 1.3to The details of karyotype for each species are de- 3.0, with a standard deviation of 0.34(Table3).The scribed below. distribution of %TCL is shown in Fig.2B, showing Table 1. List of specimens used for studies on chromosome and DNA content of three species of the subfamily Clupeinae. Table 2. Frequency distributions of diploid chromosome numbers of three species of the subfamily Clupeinae. Table 3. Karyotypes, DNA content and ranges of %TCL of three species of the subfamily Clupeinae. •\ 290•\ Ida et al.: Clupeinae Karyotypes and DNA A B C Fig. 1. Photographs of mitotic metaphase chromosomes and their karyotypes. A:Sardinella zunasi,2n=48 . B:Sardinops melanostictus,2n=48.C:Clupea pallasii,2n=52.Each scale indicates10 ,ƒÊm. a closely similar patern to Sardinella zunasi. The of2N=52indicated the diploid number for this DNA content of this species was 2.69pg/cell(Table species. The karyotype was composed of six meta- 3), with a standard deviation of 0.44. centric or submetacentric chromosomes and 46 acro- Clupea pallasii (Fig.1C):The sharp modal count centric or subtelocentric chromosomes. There were •\ 291•\ 魚類学雑誌 Japan. J. Ichthyol.38(3),1991 analyzed karyologically (Table4). Of these, six species belong to the subfamily Alosinae (Mayers A and Roberts, 1969; Khuda-Bukhsh, 1979;Vasil'yev, 1980;Doucette and Fitzsimons,1988),two species to the subfamily Dorosomatinae (Fitzsmons and Doucette,1981)and five species to the subfamily Clupeinae (Roberts,1966;Rishi,1973;Skvortsova, 1975;Krysanov,1978).We added the karyotypes of three species in the subfamily Clupeinae, i.e. Sardin- ella zunasi, Sardinops melanostictus and Clupea pal- lasii. According to Doucette and Fitzsimons (1988), it B has been supposed that the ancestral chromosome form of the family Clupeidae had 48 acrocentric chromosomes. The karyotypes of Sardinella zunasi and Sardinops melanostictus consisted of 48 acrocentric or subtelo- centric chromosomes and there were no peculiar chromosomes, either in size or shape. The grouping of these chromosomes is virtually impossible because of their smooth gradation in size. The ranges of %TCL in the two species were both 1.3-3.0, and C distribution patterns of %TCL were very similar (Fig.2A,B). It seems that these two species have retained their ancestral chromosomal structure. C. pallasii exhibited a derived feature in having 52 rather than 48 chromosomes. The result of this study is in accordance with Krysanov(1975).The karyotype contained six metacentric or submeta- centric, and 46 subtelocentric or acrocentric chromo- Fig. 2. Frequency diagrams showing the distri- somes. The six metacentric or submetacentric chro- bution of %TCL in the chromosomes of three mosomes probably resulted from pericentric inver- species; A:Sardinella zunasi, B: Sardinops sion in each chromosome, because their sizes were melanostictusand C: Clupeapallasii. %T'CL is about equal to the average size. Judging from their the percent of each chromosomecontributed to marked differences in size, the four small, acrocen- the total length of the complement (Doucette and Fitzsimons,1988). tric or subtelocentric chromosomes seem to have resulted from centric fission of one pair of small- sized metacentric or two pairs of submetacentric or two pairs of acrocentric chromosomes that were subtelocentric chromosomes, because the resultant smaller than the other chromosomes. The funda- chromosome sizes are smaller than half of the aver- mental number was 58 and the new arm number 48- age chromosome size (Fig.2C). Based on these 50(Table3).The %TCL ranged from 0.5-2.8, with assumptions, the ancestral chromosome number of a standard deviation of 0.42(Table3). The distri- C. pallasii was estimated to be 2n=48 or 50. bution of %TCL, shown in Fig.2C, differed from With regard to cellular DNA content analyses of the former two species. The DNA content of this the family Clupeidae, there are two reports dealing species was 1.92pg/cell (Table3), with a standard with four species (three species of the genus Alosa deviation of 0.23. and Clupea harengus pallasii (Table4)). The DNA content of these species ranged from 1.54 to 2.8pg/ cell. Discussion Among the three species treated here, Sardinella In the family Clupeidae, 13 species have been zunasi has a DNA content value of 2.32, Sardinops •\ 292•\ Ida et al.: Clupeinae Karyotypes and DNA melanostictus 2.69 and C. pallasii 1.92pg/cell. Ohno It may be concluded that there are at least two and Atkin (1966) reported the haploid value for the different patterns of karyological evolution among last-mentioned species as 0.77 pg(=1.54pg/cell).
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