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Notes: 1993 0743-8141 English Journal Article Author Address
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Notes: 1993 0743-8141 English Journal Article Author Address: Tetra Tech, Inc., 11820 Northup Way, Suite 100 E, Bellevue, WA 98005, USA Reference Type: Journal Article Record Number: 179 Author: Barbiero, R. P. Year: 1993 Title: A contribution to the life history of the planktonic cyanophyte, Gloeotrichia echinulata Journal: Archiv fur Hydrobiologie. Stuttgart Volume: 127 Issue: 1 Pages: 87-100 Alternate Journal: Arch. Hydrobiol. Accession Number: 2997180 Keywords: life history; migratory species; temperature effects; dissolved oxygen; associated species; seasonal variations; population functions; growth; activity patterns; regression analysis; variance analysis; plant morphology; Gloeotrichia echinulata; Gloeotrichia natans; Gloeotrichia pisum; Microcystis; Aphanizomenon flos-aquae; Anabaena circinalis; USA, Washington, Seattle sediment
Freshwater Q1 01461 Plankton Abstract: Observations on the life history of Gloeotrichia echinulata were made during the course of a two-season study. Migration out of the sediments was preceded by increases in illumination at the sediment surface. Positive correlations were found between migration rate and both temperature and oxygen concentration. G. echinulata was found to overwinter as a spherical aggregation of akinetes embedded in a thick mucilage. Germination, triggered by light, and a short period of growth probably takes place on the sediment, before the onset of gas vacuolation and the subsequent ascent into the plankton. Notes: 1993 0003-9136 Bibliogr.: 45 ref. English
Journal Article Author Address: Western Washington Univ., Huxley Coll. Environ. Stud., Bellingham, WA 98225, USA Reference Type: Journal Article Record Number: 180 Author: Zelent, B.; Dudkowiak, A.; Frackowiak, D.; Leblanc, R. M. Year: 1992 Title: Fluorescence lifetimes of immobilized phycobilisomes isolated from various cyanobacteria Journal: Photosynthetica Volume: 26 Issue: 3 Pages: 415-21 Accession Number: AN 1993:599750 Keywords: Cyanobacteria (immobilized phycobilisomes from, fluorescence lifetimes of); Phycobilisome (immobilized, from cyanobacteria, fluorescence lifetimes of); Fluorescence (lifetimes, of immobilized phycobilisomes from cyanobacteria); Allophycocyanins Role: BIOL (Biological study) (of immobilized phycobilisomes from cyanobacteria, fluorescence lifetimes of) cyanobacteria phycobilisome fluorescence lifetime Abstract: The fluorescence lifetimes of phycobilisomes isolated from the cyanobacteria Anabaena variabilis, Anabaena azollae, Tolypothrix tenuis, Oscillatoria sp. and Gloeotrichia racibourixii and immobilized in polyvinyl alc. film were measured and deconvoluted into exponential components. The results were compared on the basis of absorption, fluorescence emission and excitation and photoacoustic spectra of Gloeotrichia. Allophycocyanin fluorescence emitted at 670 nm region showed different lifetimes from that in 700 nm range. This suggests the presence of more than one allophycocyanin final emitter. [on SciFinder (R)] Notes: CAN 119:199750 11-6
Plant Biochemistry Cent. Rech. Photobiophys.,Univ. Quebec,Trois-Rivieres,QC,Can. Journal 0300-3604 written in English. Reference Type: Journal Article Record Number: 182 Author: Pierson, Donald C.; Pettersson, Kurt; Istvanovics, Vera Year: 1992 Title: Temporal changes in biomass specific photosynthesis during the summer: regulation by environmental factors and the importance of phytoplankton succession Journal: Hydrobiologia Volume: 243-244 Pages: 119-35 Accession Number: AN 1993:36109 Keywords: Microorganism growth (blooming, by phytoplankton, seasonal changes in photosynthesis in relation to); Photosynthesis (by phytoplankton, seasonal changes in, environment in relation to); Gloeotrichia echinulata (photosynthesis by, seasonal changes in); Light (phytoplankton photosynthesis in relation to); Plankton (phyto-, photosynthesis by, seasonal changes in, environment in relation to); Rhythm (seasonal, of photosynthesis by phytoplankton) phytoplankton photosynthesis environment Abstract: Measurements of phytoplankton photosynthesis vs. irradiance relationships were made at 3-7 day intervals in Lake Erken (central Sweden) for three years during summer stratification. Both the rate of light-limited (aB) and light-satd. (PBmax) photosynthesis per unit chlorophyll a showed distinct and similar temporal trends in each year. Seasonal trends were esp. evident for PBmax, which increased in value for several weeks following the onset of thermal stratification, and then declined in the presence of the large colonial blue-green alga, Gloeotrichia echinulata. By late summer, when the biomass of G. echinulata had decreased, PBmax again rose to its early summer value. The covariation of biomass-specific photosynthesis with the blooming of G. echinulata was the one clear seasonal (week-month) pattern which emerged in each of 3 yr. Over short (day-week) time scales, changes in aB were related to changes in irradiance exposure on the day of sampling. However, the relationship between these two parameters was variable in time, since it was superimposed upon longer term trends controlled by changes in phytoplankton species compn. Increases in G. echinulata biomass corresponded with a deepening of the thermocline, which both increased internal phosphorus loading and the transport of resting G. echinulata colonies into the epilimnion. The timing and magnitude of the yearly G. echinulata bloom was as a result related to the seasonal development of thermal stratification. These results illustrate the importance of seasonal changes in the phytoplankton community as a factor regulating rates of biomass specific photosynthesis, particularly when the successional changes involve species with very different life strategies. [on SciFinder (R)] Notes: CAN 118:36109 11-6
Plant Biochemistry Inst. Limnol.,Uppsala Univ.,Uppsala,Swed. Journal 0018-8158 written in English. Reference Type: Book Record Number: 181 Author: Pierson, D. C.; Pettersson, K.; Istvanovics, V. Year: 1992 Title: Temporal changes in biomass specific photosynthesis during the summer: Regulation by environmental factors and the importance of phytoplankton succession Series Editor: Ilmavirta, V.; Jones, R. I. Number of Pages: 119-135 ISBN: 0018-8158 Accession Number: 2863098 Keywords: photosynthesis; irradiance; phytoplankton; seasonal variations; ecological succession; biomass; thermal stratification; summer; succession; Gloeotrichia echinulata; Cyanophyta Sweden, Erken L.; succession; ecological succession Freshwater Q1 01461 Plankton; K 03049 Algae; K 03009 Algae Abstract: Measurements of phytoplankton photosynthesis vs. irradiance relationships have been made at 3-7 day intervals in Lake Erken (central Sweden) for three years during summer stratification. Both the rate of light-limited ( alpha super(B)) and light-saturated (P super(B) sub(m)ax )photosynthesis per unit chlorophyll a showed distinct and similar temporal trends in each year. Seasonal trends were especially evident for P super(B) sub(m)ax )which increased in value for several weeks following the onset of thermal stratification, and then declined in the presence of the large colonial blue-green alga, Gloeotrichia echinulata). By late summer, when the biomass of G. echinulata had decreased, P super(B) sub(m)axa)gain rose to its early summer value. The covariation of biomass-specific photosynthesis with the blooming of G. echinulata) was the one clear seasonal (week-month) pattern which emerged in each of 3 years. Increases in G. echinulata biomass corresponded with a deepening of the thermocline, which both increased internal phosphorus loading and the transport of resting G. echinulata colonies into the epilimnion. The timing and magnitude of the yearly G. echinulata bloom was as a result related to the seasonal development of thermal stratification. Notes: 40-Year Jubilee Symp. of the Finnish Limnological Society, Helsinki (Finland), 6-10 Aug 1990 The dynamics and use of lacustrine ecosystems., 1992 Hydrobiologia, vol. 243-244 English
Book Monograph; Conference Author Address: Inst. Limnol., Uppsala Univ., Box 557, S-751 22 Uppsala, Sweden Reference Type: Journal Article Record Number: 104 Author: Istvanovics, Vera; Pettersson, Kurt; Pierson, Don; Bell, Russell Year: 1992 Title: Evaluation of Phosphorus Deficiency Indicators for Summer Phytoplankton in Lake Erken Journal: Limnology and Oceanography Volume: 37 Issue: 4 Pages: 890-900 Date: Jun. Abstract: Short-term changes in nutrient status of summer phytoplankton were studied in Lake Erken in 1988. The P deficiency index (PDI), which is defined as the rate of light-saturated photosynthesis $(P_opt)$ divided by the maximum phosphate uptake velocity $(V_max)$, was a superior indicator of P deficiency, despite the fact that dramatic shifts in nutrient status did not occur during the study period. Indicators containing physiological rates (orthophosphate turnover time, TT; Chl-specific total alkaline phosphatase activity, $TAPA^B$, and Chl-specific maximal phosphate uptake velocity, $V^B_max$) were also sensitive enough to show changes in the P status of algae. In contrast, indicators based on the chemical composition of the particulate matter (PN:PP, Chl-specific surplus P content, $SP^B$) failed to show short-term variations in algal nutritional status. Correlations were found between PDI and $TAPA^B$, PDI and TT, as well as PDI and turnover time of surplus P $(T_SP)$. PDI ranges previously suggested to indicate different degrees of algal P deficiency were found to describe P deficiency adequately in Lake Erken. Notes: FLA Notes
00243590 American Society of Limnology and Oceanography latex Copyright 1992 American Society of Limnology and Oceanography URL: http://links.jstor.org/sici?sici=0024-3590%28199206%2937%3A4%3C890%3AEOPDIF%3E2.0.CO%3B2-F Reference Type: Journal Article Record Number: 183 Author: Bronmark, C.; Klosiewski, S. P.; Stein, R. A. Year: 1992 Title: Indirect Effects of Predation in a Fresh-Water, Benthic Food-Chain Journal: Ecology Volume: 73 Issue: 5 Pages: 1662-1674 Date: Oct Accession Number: ISI:A1992JP74000015 Keywords: algal assemblage; field-cage experiments; food chain theory; fresh-water snails; herbivory; indirect effects; periphyton; predation; pumpkinseed sunfish; top-down effects; trophic cascade; yellow perch field experiments; sea otters; invertebrate community; vertebrate predation; trophic interactions; primary productivity; littoral-zone; water snails; competition; fish Abstract: Theories of cascading trophic interactions provide specific predictions regarding the forces that regulate populations across trophic levels. Reducing predators in a food chain with three trophic levels should permit herbivores to increase, thus reducing primary producers. In a manipulative experiment involving a molluscivorous fish (pumpkinseed sunfish, Lepomis gibbosus), freshwater snails, and periphytic algae, we tested this prediction. With 10 cages (3 x 3 x 2 m) in each of two lakes in northern Wisconsin, we generated three treatments: exclosures (fishless), enclosures (three pumpkinseed sunfish), and cageless controls, both in Mann Lake, which had high natural densities of pumpkinseed sunfish (HDP), and in Round Lake, which had low densities (LDP). During a 16-mo experiment, we quantified snail and periphyton biomass on plastic flagging within treatments during summer at 3- and 6-wk intervals in 1986 and 1987, respectively. Predation by pumpkinseed sunfish reduced snail biomass on flagging, permitting periphyton biomass to increase, as compared to exclosures. As expected, periphyton biomass in cageless controls in Mann Lake (HDP) mirrored periphyton biomass in enclosures, whereas cageless controls in Round Lake (LDP) differed from exclosures. The periphyton assemblage changed dramatically with increasing grazing pressure. In enclosures (low grazing), filamentous algae and large, stalked diatoms dominated the periphyton assemblage, whereas in exclosures (high grazing), assemblages were dominated by small, adnate diatoms and a colonial, filamentous bluegreen alga (Gloeotrichia). In laboratory trials, snails preferentially fed on periphyton from enclosures (where grazing pressure had been low). Predation reduced snail density, but indirectly increased periphyton biomass, dramatically modifying species composition of the assemblage. Thus, in mesotrophic Wisconsin lakes, top-down interactions regulate the benthic, freshwater food chain. Notes: Cited References: 1988, SAS STAT USERS GUIDE AHO J, 1984, BIOGEOGRAPHICAL STUD, P198 ALLAN JD, 1982, ECOLOGY, V63, P1444 BALL RC, 1952, ECOLOGY, V33, P41 BRONMARK C, 1988, HYDROBIOLOGIA, V169, P363 BRONMARK C, 1989, J MOLLUS STUD, V55, P299 BROWN KM, 1985, OECOLOGIA, V66, P93 CALOW P, 1973, P MALACOLOGICAL SOC, V40, P483 CARPENTER SR, 1985, BIOSCIENCE, V35, P634 CARPENTER SR, 1987, ECOLOGY, V68, P1863 CARPENTER SR, 1988, COMPLEX INTERACTIONS CATTANEO A, 1983, LIMNOL OCEANOGR, V28, P124 CATTANEO A, 1986, OECOLOGIA, V69, P612 CROWDER LB, 1982, ECOLOGY, V63, P1802 DIAMOND J, 1986, COMMUNITY ECOLOGY DUGGINS DO, 1980, ECOLOGY, V61, P447 ESTES JA, 1974, SCIENCE, V185, P1058 FRETWELL SD, 1987, OIKOS, V50, P291 GILINSKY E, 1984, ECOLOGY, V65, P455 GILLIAM JF, 1989, ECOLOGY, V70, P445 HAIRSTON NG, 1960, AM NAT, V94, P421 HANSON JM, 1986, CAN J FISH AQUAT SCI, V43, P1363 HENRIKSON L, 1980, HYDROBIOLOGIA, V68, P257 HUBENDICK B, 1947, ZOOLOGISKA BIDRAG UP, V24, P415 HURLBERT SH, 1984, ECOL MONOGR, V54, P187 JONES RC, 1982, AQUAT BOT, V13, P317 KERFOOT WC, 1987, PREDATION DIRECT IND KERFOOT WC, 1987, PREDATION DIRECT IND, P57 KLOSIEWSKI SP, 1991, SELECTIVE PREDATION LAUDER GV, 1983, J MORPHOL, V178, P1 LEIBOLD MA, 1989, AM NAT, V134, P922 LODGE DM, 1987, AM MALACOL BULL, V5, P73 LOWE RL, 1988, J N AM BENTHOL SOC, V7, P29 LUBCHENCO J, 1986, COMMUNITY ECOLOGY, P537 MARTIN TH, 1992, IN PRESS ECOLOGICAL MAZUMDER A, 1989, FRESHWATER BIOL, V22, P405 MCQUEEN DJ, 1986, CAN J FISH AQUAT SCI, V43, P1571 MENGE BA, 1976, AM NAT, V110, P352 MENGE BA, 1987, AM NAT, V130, P730 MILLER TE, 1987, PREDATION DIRECT IND, P33 MITTELBACH GG, 1984, ECOLOGY, V65, P499 MITTELBACH GG, 1987, PREDATION DIRECT IND, P315 MITTELBACH GG, 1988, ECOLOGY, V69, P614 MORENO CA, 1984, OIKOS, V42, P155 MORIN PJ, 1984, ECOLOGY, V65, P53 MULLER C, 1983, PERIPHYTON FRESHWATE, P147 NORTHCOTE TG, 1988, CAN J FISH AQUAT SCI, V45, P361 OKSANEN L, 1981, AM NAT, V118, P240 OSENBERG CW, 1989, ECOL MONOGR, V59, P405 OSENBERG CW, 1989, OECOLOGIA, V79, P512 OSENBERG CW, 1992, ECOLOGY, V73, P255 PAINE RT, 1966, AM NAT, V100, P65 PAINE RT, 1980, J ANIM ECOL, V49, P667 PERSSON L, 1988, COMPLEX INTERACTIONS, P45 PORTER KG, 1977, AM SCI, V65, P159 POWER ME, 1987, PREDATION DIRECT IND, P333 POWER ME, 1990, SCIENCE, V250, P811 REICE SR, 1986, CAN J ZOOL, V64, P1930 SADZIKOWSKI MR, 1976, AM MIDL NAT, V95, P220 SHAPIRO J, 1984, FRESHWATER BIOL, V14, P371 SIH A, 1985, ANNU REV ECOL SYST, V16, P269 SIMENSTAD CA, 1978, SCIENCE, V200, P403 STEINMAN AD, 1987, J N AM BENTHOL SOC, V6, P189 STRONG DR, 1984, ECOLOGICAL COMMUNITI THORP JH, 1981, ECOLOGY, V62, P365 THORP JH, 1981, OECOLOGIA BERL, V50, P285 THORP JH, 1986, OIKOS, V47, P75 THRELKELD ST, 1987, PREDATION DIRECT IND, P161 WEBER LM, 1990, OECOLOGIA, V82, P33 WETZEL RG, 1983, PERIPHYTON FRESHWATE, P207 English
URL: Author Address: OHIO STATE UNIV,DEPT ZOOL,COLUMBUS,OH 43210. BRONMARK, C, UNIV LUND,DEPT ECOL,ECOL BLDG,S-22362 LUND,SWEDEN. Reference Type: Journal Article Record Number: 9 Author: Bronmark, Christer; Klosiewski, Steven P.; Stein, Roy A. Year: 1992 Title: Indirect Effects of Predation in a Freshwater, Benthic Food Chain Journal: Ecology Volume: 73 Issue: 5 Pages: 1662-1674 Date: Oct. Keywords: algal assemblage, field-cage experiments, food chain theory, freshwater snails, herbivory, indirect effects, periphyton, predation, pumpkinseed sunfish, top-down effects, trophic cascade, yellow perch Abstract: Theories of cascading trophic interactions provide specific predictions regarding the forces that regulate populations across trophic levels. Reducing predators in a food chain with three trophic levels should permit herbivores to increase, thus reducing primary producers. In a manipulative experiment involving a mulluscivorous fish (pumpkinseed sunfish, Lepomis gibbosus), freshwater snails, and periphytic algae, we tested this prediction. With 10 cages (3 @? 3 @? 2 m) in each of two lakes in northern Wisconsin, we generated three treatments: exclosures (fishless), enclosures (three pumpkinseed sunfish), and cageless controls, both in Mann Lake, which had high natural densities of pumpkinseed sunfish (HDP), and in Round Lake, which had low densities (LDP). During a 16-mo experiment, we quantified snail and periphyton biomass on plastic flagging within treatments during summer at 3- and 6-k intervals in 1986 and 1987, respectively. Predation by pumpkinseed sunfish reduced snail biomass on flagging, permitting periphyton biomass to increase, as compared to exclosures. As expected, periphyton biomass in cageless controls in Mann Lake (HDP) mirrored periphyton biomass in enclosures, whereas cageless controls in Round Lake (LDP) differed from exclosures. The periphyton assemblage changed dramatically with increasing grazing pressure. In enclosures (low grazing), filamentous algae and large, stalked diatoms dominated the periphyton assemblage, whereas in exclosures (high grazing), assemblages were dominated by small, adnate diatoms and a colonial, filamentous bluegreen alga (Gloeotrichia). In laboratory trials, snails preferentially fed on periphyton from enclosures (where grazing pressure had been low). Predation reduced snail density, but indirectly increased periphyton biomass, dramatically modifying species composition of the assemblage. Thus, in mesotrophic Wisconsin lakes, top-down interactions regulate the benthic, freshwater food chain. Notes: FLA 00129658
The Ecological Society of America and the Duke University Press EN Copyright 1992 The Ecological Society of America URL: http://links.jstor.org/sici?sici=0012-9658%28199210%2973%3A5%3C1662%3AIEOPIA%3E2.0.CO%3B2-P Reference Type: Journal Article Record Number: 184 Author: Barbiero, R. P.; Welch, E. B. Year: 1992 Title: Contribution of Benthic Blue-Green-Algal Recruitment to Lake Populations and Phosphorus Translocation Journal: Freshwater Biology Volume: 27 Issue: 2 Pages: 249-260 Date: Apr Accession Number: ISI:A1992HW34300008 Keywords: microcystis-aeruginosa kutz; phytoplankton population; eutrophic lake; shallow lake; sediments; aphanizomenon; sporulation; dynamics Abstract: 1. A two-season investigation was undertaken to determine the contribution of benthic recruitment to the population development of several species of blue-green algae. 2. Gloeotrichia echinulata populations were shown to be heavily subsidized by benthic recruitment, deriving on average 40% of their planktonic colonies from the benthos. 3. Benthic recruitment of Aphanizomenon flos-aquae; Anabaena flos-aquae and a second Anabaena species contributed less than 2% to planktonic increases, while Microcystis aeruginosa recruitment was negligible. 4. Phosphorus translocation via migrating G. echinulata accounted for most of the phosphorus (P) in the planktonic colonies, and constituted a significant portion of the internal loading of the lake. 5. Estimated P translocation via Aph. flos-aquae was relatively minor, although there was evidence of luxury uptake in the benthos. Notes: Cited References: 1985, STANDARD METHODS EXA BAUER HH, 1978, INSTRUMENTAL ANAL BOLSTRIDGE JC, 1982, THESIS U WASHINGTON BOSTROM B, 1985, VERH INT VEREIN LIMN, V22, P3335 BOSTROM B, 1988, HYDROBIOLOGIA, V170, P229 BOSTROM B, 1989, AQUAT SCI, V51, P153 CARPENTER SR, 1980, ECOLOGY, V61, P1145 CMIECH HA, 1984, BRIT PHYCOL J, V19, P245 EBER JP, 1958, EXP CELL RES, V15, P28 EPPLEY RW, 1968, J PHYCOL, V4, P333 FALLON RD, 1981, FRESHWATER BIOL, V11, P217 FAY P, 1969, J EXP BOT, V20, P100 FITZGERALD GP, 1967, ENV REQUIREMENTS BLU, P97 FOGG GE, 1969, P ROY SOC LOND B BIO, V173, P175 FUCHS GW, 1973, BIOL BLUE GREEN ALGA, P117 GACHTER R, 1988, LIMNOL OCEANOGR, V33, P1542 GERLOFF GC, 1954, ECOLOGY, V35, P348 GOOR ACJ, 1925, REV ALGOLOGIQUE, V2, P19 GRAN HH, 1929, RAPP CONS EXPLOR MER, V56, P1 HAPPEYWOOD CM, 1976, BRIT PHYCOL J, V11, P355 HEANEY SI, 1980, REP FRESHWAT BIOL AS, V48, P27 ISTANOVICS V, 1990, INT VEREINIGUNG THEO, V24, P231 JACOBY JM, 1982, WATER RES, V16, P911 JONES RI, 1979, HYDROBIOLOGIA, V62, P55 KAPPERS FI, 1976, HYDROBIOL B, V10, P164 LOFGREN S, 1989, WATER RES, V23, P1115 LUND JWG, 1965, BIOL REV, V40, P231 MESNER N, 1985, USE SEASONAL PHOSPHO MITCHELL SF, 1981, VERH INT VER LIMNOL, V21, P1017 MORTIMER CH, 1941, J ECOL, V29, P280 MORTIMER CH, 1942, J ECOL, V30, P147 NETER J, 1985, APPLIED LINEAR STATI NOVIKOV BI, 1984, HYDROBIOL J, V20, P17 OLSON FCW, 1950, T AM MICROSC SOC, V69, P272 OSGOOD RA, 1988, HYDROBIOLOGIA, V169, P69 PERKINS M, 1983, LIMNOLOGICAL CHARACT PIETERSE AJH, 1974, THESIS U WASHINGTON PRESCOTT GW, 1951, ALGAE W GREAT LAKES PRESCOTT GW, 1973, HOW KNOW FRESHWATER PRESTON T, 1980, NATURE, V288, P365 REYNOLDS CS, 1967, B SHROPS CONSERV T, V10, P9 REYNOLDS CS, 1972, FRESHWATER BIOL, V2, P87 REYNOLDS CS, 1976, J ECOL, V64, P529 REYNOLDS CS, 1981, PHILOS T ROY SOC B, V293, P419 ROELOFS TD, 1970, LIMNOL OCEANOGR, V15, P224 ROSE ET, 1934, U IOWA STUD NAT HIST, V16, P129 ROTHER JA, 1977, P ROY SOC LOND B BIO, V196, P317 ROTHER JA, 1979, FRESHWATER BIOL, V9, P369 SALONEN K, 1984, FRESHWATER BIOL, V14, P431 SAUNDERS WMH, 1955, J SOIL SCI, V6, P254 SCHEAFFER RL, 1990, ELEMENTARY SURVEY SA SHERR EB, 1982, J PLANKTON RES, V4, P961 SINGH HN, 1953, INT VEREINIGUNG THEO, V12, P831 SIRENKO LA, 1969, HYDROBIOL J, V5, P1 SMITH CS, 1986, LIMNOL OCEANOGR, V31, P1312 SOMMERS LE, 1970, LIMNOL OCEANOGR, V15, P301 STEWART WDP, 1978, MITT INT VER LIMNOL, V21, P224 TAKAMURA N, 1984, J PLANKTON RES, V6, P1019 TRIMBEE AM, 1984, J PLANKTON RES, V6, P897 WALKER TW, 1958, SOIL SCI, V85, P307 WELCH EB, 1987, LAKE RESERVOIR MANAG, V3, P58 WESENBERGLUND C, 1904, STUDIER DANSK SOERS WILDMAN RB, 1975, J PHYCOL, V11, P96 WISLOUGH SM, 1912, B JARDIN IMPERIAL BO, V11, P155 English
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