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Table A-3 <br />• Lorencito Canyon Mine <br />Periphyton Bioassessment Metrics for <br />Stations in Lorencito Canyon and the Purgatoire River <br />September 9-10, 1996 <br />• <br /> <br /> LC-1 LCD PRGTY-1 PRGTY-1a PRGTY-2 <br />General Metrics <br />Number of Nondiatom Taxa 1 1 1 1 1 <br />°/g Dominant Nondiatom Taxon 0.00 0.18 0.07 26.98 0.04 <br />Number of Diatom Taxa 12 29 29 20 31 <br />°/p Dominant DiatomTaxon 45.00 54.50 29.10 68.80 25.80 <br />Diversity Indices <br />Shannon (H) 1.87 2.82 3.06 2.07 3.31 <br />Evenness (e) 0.33 0.31 0.38 0.25 0.48 <br />Biotic Indices <br />Pollution Index 2.9 2.7 2.7 2.8 2.2 <br />Siltation Index 1.4 65.9 38.1 78.3 49.7 <br />Composition Per Division <br />Bacillariophyceae (diatoms) 100.00 99.82 99.89 41.25 99.96 <br />Chlorophyta (green algae) 0.00 0.00 0.11 31.52 0.04 <br />Cyanophyta (blue-green algae) 0.00 0.18 0.00 0.25 0.00 <br />Rhodophyta (red algae) 0.00 0.00 0.00 26.98 0.00 <br />Notes: <br />No. of Nontllatlome Ths number o1 nontlialpm taxa m a penphytpn rammuntly is inveraery proportional to Ne tlegree d enwronmantal sbam <br />This melnc genealy inoeases wM inaeavng bimic wntlaion. <br />X Oom. NontlMtom The percent rantnbulion of the most numerous nontliatom lountl. Untlisturbetl environments generally support mmmuninae <br />having large number M species wM no intlrvitliual speuea present in ovenxhelming abuntlance <br />No, of Dlalpm The number of tlrelom leas in a pariphylon community is inverssry prpponi0nal to the gegree of enwronmen191 atreas. <br />This metre generaly inveesea with inveamng bipbc cpntlibon <br />A Dam. Dlatom Tha percent mmnbulan of Ihs most numerous tlmtpm IounO Untlrsturbetl snwmnmenR paneralry suppotl communniae <br />saving large numbara of lpeuea wah no intlrvitlval speuaa prsaenl in ovenxhelmeg abuManpe <br />Shannon N A tlrveraM intba wham rel9liva ebuntlanm pf Ins oMerenl tlialom laaa an taken into account <br />Mountain alreama peMrelly rete ea: <1.00 (poop, 100.1 ]S lfaip. 1 ]61 50 (ppptll, >1 50leacellenq <br />Evenneee The meaaun N how evenry Ina intlrvitluaN are tlistribuletl among speciaa <br />Even alight levsle of tlegreoetion can retluce evenness below 0 5, antl generally balpw 0 0 <br />Pollullon Intle[ Thee index is basetl an the Iratlipn of tlomma in earn al me mrea gmupa' moat lolerarn (1). roes 1°lernnl (11, antl sansilwe (31 <br />This number well range from 1.00 (all mpslaoleranl) to ] 00 tall sansilwal arM genarelry rate as' <t S Isevere ppllubonl, <br />1 5-2 OO Imotlerale), 101-2.50 (minoq. >2.50 (none) <br />Silbtlon Intln Thia o the total percent relalrve abuntlance of Neveule. Nilzsdna, aM Sunrolla spores. These motile speaes ere tlapleO <br />to bottling Ihe[ position on unstable subsbalea. so (hair proponiOn in a 6ample may W tlirMry relalatl tp the tlegree of <br />satlimanlalion on the stream bosom This ~ntlea will rarga Irom 00 (lox siaalion) Io 100 O Ihign sillalianl antl generally <br />rate as >60 (neavy sdla0on), 40fi01mooerete). 10-J9lminoq. QO (none) <br />7 <br />