INSTALLATION AND OPERATION COMPLI SCENIST II 8Compli Scenist II with (CSR-2) <strong>and</strong> Alarm InputCS-2045II Mode 1 CSR-2 ALARM33 4 412345678910111213141516ON8OFF9101112131476543211 LED Common 72 OFF LED 67 ON LED 18 Button GND 8 X9 ALARM X11 OFF Button 916 ON Button 14ALARMSYSTEMCompli Scenist II with CSR-5 used as Preset Exp<strong>and</strong>erCS-2045II MODE O CSR-533 4 41234567891011121314151689101112131476543211 LED Common 12 OFF LED 23 I LED 34 H LED 45 G LED 56 F LED 67 E LED 78 Button GND 811 OFF Button 912 I Button 1013 H Button 1114 G Button 1215 F Button 1316 E Button 14Compli Scenist II with Three (CSR-2) used as Raise/Lower Remotes33 4 412345678910111213141516RAISELOWER7654321RAISELOWER7654321RAISELOWER7654321CS-2045II Mode 2 R/L #1 R/L #2 R/L #38 BUTTON GND 8 8 815 RAISE (1) 1414 LOWER (1) 913 RAISE (2) 1412 LOWER (2) 910 RAISE (3) 149 LOWER (3) 9
CONTEMPORARY DISTRIBUTION AND LATE-QUATERNARY STRATIGRAPHY OF DIATOMS IN THE JUNIN PLAIN29Non-significant environmental parameters wereexcluded from further analyses. With the selectedset of significant parameters, we ran a series of constrainedCCAs on each individual environmentalvariable. The significance of the first axis was testedusing Monte Carlo permutation tests (p ≤ 0.05) with199 unrestricted permutations. Any non-significantenvironmental variable was excluded from furtheranalyses. An additional CCA was performed withthe statistically significant environmental parameters,<strong>and</strong> then we identified highly correlated environmentalvariable pairs (-0.6> r >0.6) from the Pearsoncorrelation matrix. Partial CCAs were performed foreach correlated pair; one variable as the sole variable<strong>and</strong> the other as covariable, <strong>and</strong> the significance ofeach pair of variables was determined with a MonteCarlo permutation test on the 1 st axis (P ≤ 0.05, 999unrestricted permutations). Non-significant resultsindicate that the variate-covariate variables explainedthe same part of data variance; in this case we choosethe variable explaining the highest amount of variancein the original CCA1.ResultsWater characterization of high-altitude lentic <strong>and</strong>lotic environmentsWater bodies in the Junin Plain <strong>and</strong> surroundingareas contain calcium-rich alkaline waters. Cationcomposition indicates elevated concentration of Ca +2(range from 6.9 to 99.2 mg/L, n=31) with respect toMg +2 <strong>and</strong> Na +1 +K +1 (Fig. 4a), <strong>and</strong> alkalinity is high(40.0-240.5 mgCaCO 3/L, n=32) with respect to SO4 -2<strong>and</strong> Cl -1 concentration (Fig. 4b). Waters have circumneutralto alkaline pH (6.8-9.3, n=33); moderate tohigh conductivity (168-1184 μS/cm, n=32), <strong>and</strong> lowto moderate dissolved oxygen (2.6-7.5 mg/L, n=29).Total phosphorous concentrations range from 5.9 to60.7 μg/L (n=21), total nitrogen from 118.2 to 1774.5μg/L (n=21) (Table 2), <strong>and</strong> silica concentrations rangebetween 0.3 <strong>and</strong> 6.6 mg/L (n=31).Modern diatom communitiesThe diatom composition in macrophyte samplesis represented by 58 species (relative abundance>3%) distributed over the 4 environments (Fig. 5).The most common species in lakeshore regions areGomphonema minutum, Nitzschia denticula, Synedraulna, Denticula elegans, Diatoma vulgaris,<strong>and</strong> Cymbella cistula. Some planktonic species arealso encountered in this association, such as Synedraacus var. angustissima, Synedra delicatissima, <strong>and</strong>Fragilaria crotonensis. Dominant taxa in streammacrophyte samples are Achnanthidium minutissimum,Synedra ulna, Cocconeis placentula, Naviculacryptocephala, <strong>and</strong> Staurosira spp. Wetl<strong>and</strong> macrophytesamples are dominated by Synedra delicatissima,N. cryptocephala, <strong>and</strong> Navicula radiosa. Speciescomposition in spring samples is more diverse<strong>and</strong> includes A. minutissimum, Diatoma mesodon, N.denticula, G. parvulum, Naviculadicta seminulum,Planothidium lanceolata, <strong>and</strong> Staurosira spp.Common lakeshore <strong>and</strong> lake offshore planktonicspecies from plankton tows (Fig. 6) are Synedra delicatissima,Gomphonema minutum, Fragilaria crotonensis,A. minutissimum, <strong>and</strong> Fragilaria vaucheriae.Stream planktonic diatom samples were dominatedby A. minutissimum, with low percentages of S.delicatissima, S. ulna, F. capucina, N. palea, <strong>and</strong> P.zeilleri. Surface-sediment samples from lakes havea diatom flora primarily composed of Staurosira cf.S. construens var. venter, Staurosira construens var.construens, <strong>and</strong> A. minutissimum, whereas streamsediment samples contained Staurosira cf. S. construensvar. venter, A. minutissimum, Staurosiraconstruens var. subsalina, Staurosira spp., Amphorapediculus, <strong>and</strong> Navicula capitatoradiata (Fig. 6).Samples from rock-scrub <strong>and</strong> algal biohermenvironments have a lower diatom diversity of 15species (Fig. 7). Dominant species for stream <strong>and</strong>spring habitats are A. minutissimum, C. placentula,<strong>and</strong> Reimera sinuata, whereas algal bioherm taxaare A. minutissimum, D. elegans, <strong>and</strong> Encyonopsismicrocephala.The fossil recordLake Junin sediments (core JU96-A) are composedof four distinct lithological units (Fig. 8): 1)18.79 to 14.5-m: gray to tan silt with disseminatedplant remains <strong>and</strong> mollusk shells; 2) 14.5 to 11.2m:inorganic massive gray silt; 3) 11.2 to 9.7m: darkorganic-rich silt <strong>and</strong> gyttja; <strong>and</strong> 4) 9.7 to 0.37m:yellowish-brown laminated marl with abundantgastropod shells.Diatom species composition of this 19-m coresuggests three distinct zones. Diatoms from thelower lithologic unit (18.79 to 14.5 m, Fig. 8) consistof benthic taxa, with the dominance of Staurosirasp. cf. S. construens var. venter (up to 85%) <strong>and</strong>other benthic littoral <strong>and</strong> tycoplanktonic species,such as Pseudostaurosira brevistrata, Staurosiraconstruens var. construens, Staurosira construensvar. subsalina, <strong>and</strong> Staurosirella pinnata. In somelevels the epiphytic diatoms Cocconeis placentula
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