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Titolo:
Impact of Ca(OH)(2) treatment on macroinvertebrate communities in eutrophic hardwater lakes in the Boreal Plain region of Alberta: in situ and laboratory experiments
Autore:
Yee, KA; Prepas, EE; Chambers, PA; Culp, JM; Scrimgeour, G;
Indirizzi:
Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada Univ Alberta Edmonton AB Canada T6G 2E9 Sci, Edmonton, AB T6G 2E9, Canada Natl Water Res Inst, Saskatoon, SK S7N 3H5, Canada Natl Water Res Inst Saskatoon SK Canada S7N 3H5 atoon, SK S7N 3H5, Canada Alberta Res Council, Forest Resources Business Grp, Vegreville, AB T9C 1T4, Canada Alberta Res Council Vegreville AB Canada T9C 1T4 ille, AB T9C 1T4, Canada
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
fascicolo: 1, volume: 57, anno: 2000,
pagine: 125 - 136
SICI:
0706-652X(200001)57:1<125:IOCTOM>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER; PHOSPHORUS; ADDITIONS; BIOMASS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Prepas, EE Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada Univ Alberta Edmonton AB Canada T6G 2E9 on, AB T6G 2E9, Canada
Citazione:
K.A. Yee et al., "Impact of Ca(OH)(2) treatment on macroinvertebrate communities in eutrophic hardwater lakes in the Boreal Plain region of Alberta: in situ and laboratory experiments", CAN J FISH, 57(1), 2000, pp. 125-136

Abstract

Ca(OH)(2) treatment has been recently used to remediate water quality problems associated with eutrophication in lakes on the Boreal Plain of westernCanada. This study examines how Ca(OH)(2) treatment affects the survival of Hyalella azteca and larvae of Chironomus spp. in laboratory microcosms and the abundance and seasonal dynamics of macroinvertebrates in two eutrophic hardwater lakes. Macroinvertebrate data for three reference lakes sampledduring the same time period are also presented. Additions of 225 and 295 gCa(OH)(2).m(-2) (74 and 107 mg.L-1) to two lakes resulted in lake water pHremaining within its natural range (< 10) and had no discernable effects on macroinvertebrate density or biomass up to 2 years after treatment. Macroinvertebrate response to Ca(OH)(2) in hardwater lakes differed markedly from results reported for softwater lakes. After 4 days, no detectable influence was observed on survivorship of Chironomus spp. with laboratory dosages of 0-300 g Ca(OH)(2).m(-2) (0-1781 mg.L-1), but survivorship of H. azteca was reduced by greater than or equal to 50% at dosages that raised water pH to greater than or equal to 10 (300 g Ca(OH)(2).m(-2)). The sensitivity of H. azteca, but not Chironomus spp., could be a result of singular or combined effects of Ca(OH)(2) levels, precipitate, or changes in pH. It may also reflect the greater dependence of H. azteca than Chironomus spp on the water above, rather than below, the sediment-water interface.

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Documento generato il 21/09/20 alle ore 05:47:26