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<br /> -- <br /> Appendix A. Taxa, densities of richest-targeted habitat periphyton, and sampling date for environmental samples at sites in the Upper Colorado River Basin study unit, 1996-97---Continued <br /> [--, species not found in sample; A, abundance as cells per square centimeter; B, biovolume as cubic micrometers per square centimeter; densities and biovolumes rounded to 3 significant <br /> figures; <br /> 11, micrometer; <, less than; Site abbreviations are used in this table. See table I for full site names] <br /> Baker Baker French French Blue Blue <br /> 8/96 8/97 8/96 8/97 8/96 8/97 <br /> A B A B A B A B A B A B <br /> DIVISION <br /> Family <br /> Genus species variety <br /> Nitzschia frustulum perminuta 653 32,200 <br /> Nitzschia fruticosa <br /> Nitzschia gracilis <br /> Nitzschia hantzschiana 76 8,780 <br /> Nitzschia hungarica <br /> Nitzschia legleri <br /> Nitzschia linearis <br /> Nitzschia palea <br /> Nitzschia palea debilis 1,180 92,600 <br /> Nitzschia palea sumatrana <br /> Nitzschia paleacea <br /> Nitzschia paleaeformis 51 7,020 <br /> Nitzschia pusilla <br /> Nitzschia supralitorea <br /> Nitzschia tubicola 653 274,000 <br /> Nitzschia umbilicata <br /> Nitzschia vermicularis <br /> Simonsenia delognei <br /> Surirellaceae <br />...... Cymatopleura solea <br />Vl Surirella angusta 16 11,700 58 42,800 <br /> Surirella brebissonii <br /> Surirella minuta <br /> Thalassiosiraceae <br /> Aulacosira distans 280 26,000 56 5,150 <br /> Aulacosira italica 51 29,400 <br /> Cyclostephanos invisitatus <br /> Cyclotella meneghiniana <br /> Cyclotella ocellata <br /> Cyclotella pseudostelligera <br /> Stephanodiscus hantzschii <br /> Stephanodiscus medius <br /> Stephanodiscus sp. (2 ANS WRC) <br /> CRYPTOPHYTA (cryptomonads) <br /> Cryptomonadaceae <br /> Cryptomonas sp. 58 4,670 <br /> CYANOPHYTA (blue-green algae) <br /> Chroococcaceae <br /> Microcystis sp. <br /> Nostocaceae <br /> Amphithrix Janthina 3,280 134,000 35,500 1,450,000 126,000 5,170,000 25,400 1,040,000 <br /> Calothrix parientina 19,700 876,000 140,000 6,230,000 <br /> Calothrix sp. 27,800 16,700 55,500 33,300 <br /> Nostoc sp. <br /> Oscillatoriaceae <br />