The 47 diatom taxa listed here plus the 43 taxa in the genus Pinnularia reported earlier (Christensen 1976) constitute the numerically most important components of the diatom-flora of Pilot Knob Bog, the only known major Sphagnum bog in Iowa

Christensen, Cameron L.

English

University of Northern Iowa

Proceedings of the Iowa Academy of ScienceVolume 88 | Number Article 41981Diatoms of Pilot Knob Sphagnum Bog, HancockCounty, IowaCameron L. ChristensenIowa Central Community CollegeCopyright © Copyright 1981 by the Iowa Academy of Science, Inc.Follow this and additional works at: http://scholarworks.uni.edu/piasThis Research is brought to you for free and open access by UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academyof Science by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu.Recommended CitationChristensen, Cameron L. (1981) "Diatoms of Pilot Knob Sphagnum Bog, Hancock County, Iowa," Proceedings of the Iowa Academy ofScience: Vol. 88: No. 4 , Article 4.Available at: http://scholarworks.uni.edu/pias/vol88/iss4/4Proc. Iowa Acad. Sci. 88 (4): 152-153. 1981 Diatoms of Pilot Knob Sphagnum Bog, Hancock County, Iowa1 CAMERON L. CHRISTENSEN2 Iowa Central Community College, Webster City, Iowa 50595 The 47 diatom taxa listed here plus the 43 taxa in the genus Pinnularia reported earlier (Christensen 1976) constitute the numerically most important components of the diatom-flora of Pilot Knob Bog, the only known major Sphagnum bog in Iowa. INDEX DESCRIPTORS: Diatoms, Sphagnum Bog, Hancock Co., Iowa. Pilot Knob Bog and the associated Dead Man's Lake are found in Pilot Knob State Park, sections 3 and 4 of Ellington Twp., Hancock County, Iowa. The bog has been described in detail by Grant and Thome ( 1955). Currently it is protected as an ecological preserve inl the Iowa Preserves System under special rules which limit access to it. One special feature is the occurrence of soft, somewhat acid water in a state which generally is characterized by hard water. Partly for this reason it has attracted considerable attention from biologists. The present paper summarizes the more important members of the diatom-flora (Bacil-lariophyceae) exclusive of the genus Pinnularia which was treated in a separate paper (Christensen 1976). Christensen (1969) also published information on variability of members of the genus Eunotia. MEmODS AND MATERIALS This report is based on samples collected at two-week intervals from early June through late August 1965. Water samples taken at the same time as the diatom collections were analyzed for several chemical and physical factors using a Hach model DR-EL portable water testing kit. Typical values for several areas in the bog and lake are presented as Table 1. Diatom samples were prepared for study using the method of Van der Werff (1955). Identifications were based on species concepts in Hu-stedt (1930) and Patrick and Reimer (1966, 1975). Sets of slides on which the report was based are in the Iowa State University Diatom Collection, the Iowa Lakeside Laboratory Diatom Collection, and the author's personal collection. 1 Excerpted from a report prepared during an NSF Research Participation Pro-gram in the summer of 1965, administered at Iowa State University by Dr. J.J.L. Hinrichsen. The project supervisor was Dr. John D. Dodd. 2The author planned to revise and elaborate on this paper and had begun to do so in a series of papers on important genera (Christensen 1969, 197 6) but his untimely death in the summer of 1980 intervened and prevented completion of the project according to his design. This short paper has been submitted in his behalf, based on the original 1965 report, modified only by updating of nomenclature. Send reprint requests to Dr. J .D. Dodd, Department of Botany, Iowa State University, Ames, Iowa 500ll. Table 1. Typical values of chemical and physical parameters for water in Pilot Knob Bog and Dead Man's Lake1 Open Lake PerilJl:,ery of g Bog Pools Total Hardness 60 ppm 44ppm 20 ppm (as Ca CQ3) Sulfate 14ppm 78 ppm 1 ppm Silica 8 ppm 12 ppm 2.5 ppm Iron 0.5 ppm 1.9 ppm Orthophosphate 0.5 ppm 0.8 ppm 2.8 ppm Nitrate 3.5 ppm 3.9 ppm 4.3 ppm pHI 6.3 6.2 5.8 Temperature1 23.5 c 20 c 17.5 c 1This sample was taken at 8 a.m. on 5 June 1965 RESULTS AND DISCUSSION A total of 47 species and subspecific taxa representing 15 genera were encountered in this study. In addition, 43 taxa from the 16th genus, Pinnularia, have been reported elsewhere (Christensen 1976). Achnanthes A. hungarica (Grun.) Grun. v. hungarica A. minutissima Kiltz. v. minutissima Amphora A. ova/is (Kiltz.) Kiltz. v. ova/is A. ova/is v. affinis (Kiltz.) V.H. ex De T. Caloneis C. limosa (Kiltz.) Patr. v. limosa C. ventricosa v. truncatula (Grun.) Meist. Cocconeis C. placentula v. lineata (Ehr.) V.H. Cymbella C. aspera (Ehr.) H. Perag. v. aspera C. cistula (Ehr.) Kirchn. v. cistula C. minuta Hilse ex Rabh. v. minuta C. turgida Greg. v. turgida Eunotia E. curvata (Kiltz.) Lagerst. v. curvata E. exigua v. compacta Hust. E. formica Ehr. v. formica E. indica Grun v. indica E. kocheliensis 0. Milli v. kocheliensis 1Christensen: Diatoms of Pilot Knob Sphagnum Bog, Hancock County, IowaPublished by UNI ScholarWorks, 1981DIATOMS OF PILOT KNOB BOG 153 E. maior (W. Sm.) Rabb. v. maior E. monodon Ehr. v. monodon E. parallela Ehr. v. parallela E. pectinalis v. minor (Kiltz.) Rabb. E. valida Hust. v. valida Fragilaria F. nitzschioides Grun. v. nitzschioides Gomphonema G. angustatum (Kiltz.) Rabb. v. angustatum G. angustatum v. productum Grun. G. angustatum v. sarcophagus (Greg.) Grun. G. gracile Ehr. emend. V.H. v. gracile G. parvulum (Kiltz.) Kiltz. v. parvulum G. truncatum Ehr. v. truncatum G. truncatum v. capitatum (Ehr.) Patr. G. turris Ehr. v. turris Hantzschia H. amphioxys f. capitata 0. Milli. Melosira M. italica subsp. subarctica 0. Milli. Navicula N. cuspidata (Kiltz.) Kiltz. v. cuspidata N. cuspidata v. ambigua (Efrr. ?) Cl. N. laevissima Kiltz. v. laevissima N. lanceolata (Ag.) Kiltz. v. lanceolata N. mutica Kiltz. v. mutica N. pupula v. rectangularis (Greg.) Grun. N. subtilissima Cl. v. subtilissima Neidium N. bisulcatum (Lagerst.) Cl. v. bisulcatum N. bisulcatum v. subundulatum (Grun.) Reim. N. hitchcockii (Ehr.) Cl. v. hitchcockii N. iridis v. ampliatum (Ehr.) Cl. Nitzschia N. terrestris (Peters.) Hust. v. terrestris Pinnularia (The 43 species and subspecific taxa from this genus which were found in the Pilot Knob Bog have been reported earlier by Christen-sen (1976).) Stauroneis S. phoenicenteron (Nitz.) Ehr. v. phoenicenteron Synedra S. rumpens v. f amiliaris (Kiltz.) Grun. S. ulna (Nitz.) Ehr. v. ulna The species composition of the diatom flora of this habitat is quite different from the typical flora of most Iowa lakes and streams. The large number of Pinnularia species, as well as the considerable num-bers ofEunotia andNeidium species and the general scarcity of species of centric diatoms, are noteworthy. REFERENCES CHRISTENSEN, C.L. 1969. Notes on Iowa Diatoms IX: Variation in the genus Eunotia. Proc. Iowa Acad. Sci. 76:57-62. CHRISTENSEN, C.L. 1976. Notes on Iowa Diatoms XI: A study of the genus Pinnu/aria from Dead Man's Lake, Proc. Iowa Acad. Sci. 83:81-87. GRANT, M.L. and R.F. THORNE, 1955. Discovery and description of a Sphagnum bog, with notes on the distribution of bog plants in the state. Proc. Iowa Acad. Sci. 62:197-210. HUSTEDT, F. 1930. Bacillariophyta (Diatomeae). In: A. Pascher (ed.), Die Siisswasser-flora Mitteleuropas 10:1-466. Gustav Fisher, Jena. PATRICK, R., and C.W. REIMER. 1966. The diatoms of the United States, Volume l. Acad. Nat. Sci. Phil. Monograph 13. 688 p. PATRICK, R., and C.W. REIMER. 1975. The diatoms of the United States, Volume 2, Part l. Acad. Nat. Sci. Phil. Monograph 13. 213 p. WERFF. A. VAN DER. 1955. A new method of concentrating and cleaning diatoms and other organisms. Int. Assoc. Theoret. Appl. Limnol. 12:276-277. 2Proceedings of the Iowa Academy of Science, Vol. 88 [1981], No. 4, Art. 4http://scholarworks.uni.edu/pias/vol88/iss4/4

Diatoms of Pilot Knob Sphagnum Bog, Hancock County, Iowa

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Diatoms of Pilot Knob Sphagnum Bog, Hancock County, Iowa

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