Diatoms in alkaline Osousi Spa,Hokkaido

80

Diatom ll : 80-84. December 1995.

Akihiro Tuji '. Diatoms in alkaline Osousi Spa, Hokkaido

Key index words 'å Alkalibiontic, alkaline spring, Achnanthes minutissima, Nitschia denticula

1 Achnanthes exigua Grun.; St. 1. 1% ; St. 2.

3% (PL3: ll)2 A. minutissima Kutz.; St. 1. 29%; St. 2.

70% ;St. 3.43% (PI.3:3-5)

3 Amphora copulata (Kutz.} Schoeman & Archi-bald (PI. 2 : 18)

4 Aulacoseira crenulata (Ehr.) Kramm.; St. 2.

3% (PI. 2: 1)

5 Caloneis bacillum (Grun.) Cleve ; St. 1. 5%

(PI. 2: 4)

6 Cymbella aspera (Ehr.) Cleve (PI. 2 : 19)7 C. minuta Hilse (PL 2 : 12)8 Diploneis ovalis (Hilse) Cleve ; St. 2. 2%

(PI.3:9)

9 D. yatukaensis Horikawa et Okuno (PI. 3 : 12)10 EunotiaarcusEhr. (PI. 1 : 3, 4)ll E, exigua (Brfeb.) Rabh. (PI. 1 : 9)12 E. pectinatis var. minor Hust.; St. 1. 2% ;

St. 2. 1% {Pi. 1 : 5-7)

13 E. sp. aff.paludosa Grun. (PI. 1 : 8)

14 Fragilaria capucina Desm. ; St. 3. 1%

(PI. 2: 3)

15 Frustulia vulgaris (Thw.) DeToni (PL 1 : 1)

16 Gomphonema acuminatum Ehr. (PL 2 : 8-9)17 G. affine Kutz. (PL 2 : 13)

18 G. angustatum (Kutz.) Rabh. (PL 2 : 16)

19 G. clavatum Ehr. (PL 2; 14)20 G. gracilis Ehr. (PL 2 : 15)

21 G. sp.;St. 1.5%;St.2.5%;St.3.3%

(PL2: 17)

22 Meridian circular?, var. constrictum (Ralfs) Van

Heurck (PL 2 : 10-ll)

23 Navicula placenta Ehr. (PL 2 : 2)

24 M sp. aff. minima Grun.; St. 2. 2%

25 JV. veneta Kutz. ; St. 1. 2% (PL 2 : 5-6)

26 Neidiumsp. (PL 2 : 7)27 Nitschia amphibia Grun. St. 1. 1# ; St. 2.

2% ; St.3.1% (PL3:10)

28 N. denttcula Grun. (Syn. Denticula KuetingiiGrun.) ;St. 1.38% ;St.2. 7% ;St.3.45%

(PI. 3 : 6-8)

29 JV. linearis (Agardh exW. Sm.) W. Sin. ; St. 1.

12%;St.2. 3%;St.3. 4% (PL3:13)

*as-f * >ffi£ (ph) &\o^-fii Hustedt. (1937-1939) £&ffc i-f&# < «ffi3ttf%\ bilX& lQ , SifiT'ii HIkansson (1994) å MSI (1995) t£t'K£ ^XlkWi& - &T)\'ii >)&(Dt.

TJI/* UftfiiaA) tr& >K pH10.0-10.4 i®a6Tffiv* pH 46£7jH-o

o ^t, i££MX*& å ?fz Achnanthes minutissima,Nitzschia denticula Ko ^T <a£BB8*rt£R £ & (:3£&

(1) PSHfe^wsti-ettjii±.aE^4t8KS*f^«rtcffctt-ri * v ->

iffl1l^*5WSBtaot:i3 () , 7)ci?il(i^j l5cmS$ iiIt) 6m2 -T-&^,:o S^^ftt L-Cti, Homeotkrix sp.

fco *ffl(± 17.4"C, pH (i l0.0 r^^/jo SWli-^^

Station 2 : Station 1 "Cgl l ffi L7t***fflS-fS*3f

(i^j 10cm -C^j 10m2 OfcZiP&v Ko JtMffmt Lrti, saiig^flE^t-ct^o 7icS(i2i.rc, pH w

S*afen 3 : Station 2 ro^^STJII t=aEitii"4*3f"CttS? 30cm igSoaEM*5*ofco *8B(i 2-3cm "C,ipgli^j 20 cm -C& o fco Station 1 t ratfcfflffi-^5^Sl^'a < fto-Cv^to S^^*i Ltli, Amo-6ae«a sp., Lyngbya sp. ^ ^^^A LX^^tza TKimii21.3°C, pH t± 10.1 -C*ofc0 K^-i±5±i: ^^^

(2) a a s

7 7^7 Miisnaimffit^^mii^ (%) *^1-O

Accepted on Nov. ll, 1995.

Diatoms in alkaline Osousi Spa,Hokkaido

Diatoms in alkaline Osousi Spa, Hokkaido 81

Plate 1.

Diatoms in alkaline Osousi Spa,Hokkaido

84 Akihiro Tuji

30 N. sp.;St. 1. 1%

31 Pinnularia substomatophora Hust.(PI. 1 : 2, 14-15,? ll-13)

32 P. viridis (Nitzsch) Ehr.; St. 1. 1% (PI.3: 1)33 P. sp. {PI.1: 10)35 P.sp.2 (PI.1:16)35 Rhopalodia gibba (Ehr.) 0. MiiU. (PI. 3 : 2)36 Synedra ulna (Nitzsch.) Ehr. ; St. 2. 2%

^-HcOSTOcj^-C, St. 1 t St. 3 X*i± Nitzsckiadenticula r\ St. 2 -X:\i Achnanthes minutissima ft\

Lfc#-£ 12-17 taxa -efc o Tio Station glj(l^/jj^^ St. 2 t^coife^(±^fta^^^:^ <*ofco ^

^W&X-jg&Ut LT|,t,il/: A. minutissima \z-=>^Xi±mM (1995) ri*fl£*«fcl&* £ £ i&t^.&o

t»i4^fi tHx.^ St Ltv^c [Wlfflii Cacconeis

placentula 4 ft fc & (I, ft#ttSI!K#*tf>ifcfiKis ^TTfl s-Wfifc L-C Js

ffi»tffo -Cfc>4 ; t-C, iS£ (1995) ©f^fJI^

(1995) ^^ fcv^ ^ coicioV^-r tM^tL^oM denticula (ioi/*-C(i Schoeman (1973) #$i£3fc

"CV»4O -ttHl i ttlfNiessen, Foged, Chlonoky (i

^atv»i*tL4T^* Ulittt Utfe D, Schoemang# 4 Effi£#Hft*&tHftiS pH ^8.2-8.5 fc LTiS»}, pH8.4Oflb^-C48«Offl^^Sr^TV>40 i

7t, HSkansson (1993) i r^ 'JttSi Ltv»4o

Hakansson, S. 1993 : Numerical methods for theinference of pH variations in mesotrophic andeutrophic lakes in southern Sweden-A progressreport. Diat. Res. 8 ; 349-370.

Schoeman, F. R. 1973 ; A systematical and eco-logical study of the diatom flora of Lesotho withspecial reference to the water quality. 1-355, V& R Printers, Pretoria.

SEiatfc, 1995 : H*3ftS6r>* ';fflJSt (pnio.i)

10; 1-7.tiroj Diatom

Explanation of plates

Plate 1 : 1. Frustulia vulgaris ; 2, 14-15,? ll-13.

Pinnularia substomatophora ; 3-4, Eunotia arcus ;5-7, E. pecttnaiis var. minor; 8, E, sp. aff.paludosa; 9, E. exigua; 10, P. sp.; 16,P. sp. 2

Plate 2 : 1. Aulacoseira crenulata ; 2. Naviculaplacenta ; 3. Fragilaria capucina ; 4. Caloneisbacillum ; 5-6. Navicula veneta ; 7. Neidium sp. ;8-9. Gomphonema acuminatum ; 10-ll. Meridiancirculars var. consirictum ; 12. Cymbella minutaHilse ; 13. Gomphonema affine ; 14. G. clavatum ;15. G. gracilis; 16. G. angustatum; 17. G. sp.;

18. Amphora copulata ; 19. Cymbella asperaPlate 3: 1. Pinnulavia viridis ; 2. Rhopalodia

gibba; 3-5. Achnanthes minutissima ; 6-8. JVite-scMTz denticula ; 9. Diploneis ovalis ; 10. JVife-sc/»a amphibia ; ll. Achnanthes exigua ; 12. Z)i-ploneis yatukaensis ; 13. Nitzschia linearis

it mn : 520-01 m^±m^Tm*4-1-23 sw^iss^fflse-fe > * -Akihiro Tuji : Center for Ecological Research, Kyoto Univ., 4-1-23 Shimosakamoto, Otsu.