1986
DOI: 10.1139/f86-144
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Current Velocity in Streams and the Composition of Benthic Algal Mats

Abstract: Water velocity is commonly accepted as a factor in the development of benthic algal mats in streams. Within a stream, two different zones of velocity are observed: the free-water velocity of the open water and the local velocity near the stream substrate. A closed laboratory flume system was used to observe the taxonomic composition of benthic algal mats and corresponding changes in the local velocities under different free-water velocities. As the algal mat developed under each experimental velocity, local ve… Show more

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Cited by 45 publications
(20 citation statements)
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“…This result is reinforced by the fact that current velocity was similar between high and low water periods at the downstream site, unlike upstream of the dam. Current velocity has been reported as one of the main factors that determine taxa distribution and abundance in regulated streams (Horner and Welch, 1981;Stevenson, 1984b;Reiter and Carlson, 1986;Growns, 1999;Poff et al, 2007;Poff and Zimmerman, 2010). Differences in aquatic biota between sites upstream and downstream of dams similar to those found in our study have been reported by many researchers (Jakob et al, 2003;Uehlinger et al, 2003;Poff and Zimmerman, 2010).…”
Section: Discussionsupporting
confidence: 85%
“…This result is reinforced by the fact that current velocity was similar between high and low water periods at the downstream site, unlike upstream of the dam. Current velocity has been reported as one of the main factors that determine taxa distribution and abundance in regulated streams (Horner and Welch, 1981;Stevenson, 1984b;Reiter and Carlson, 1986;Growns, 1999;Poff et al, 2007;Poff and Zimmerman, 2010). Differences in aquatic biota between sites upstream and downstream of dams similar to those found in our study have been reported by many researchers (Jakob et al, 2003;Uehlinger et al, 2003;Poff and Zimmerman, 2010).…”
Section: Discussionsupporting
confidence: 85%
“…Assuming that amplitude decreases with depth by 50% for every one-ninth of wavelength, vertical motions of 0.5 m s~' at 10 m and 0.1 m s~' at 20 m might be expected, though boundary layer effects are likely to reduce this at the rock surface. Currents of this magnitude can cause sloughing in stream periphyton (Reiter & Carlson 1986) and the potential therefore exists for some loss to this mechanism, even at 20 m depth. There is no reason to suspect that high biomass of periphyton accumulates in Lake Taupo because of unusually low sloughing losses.…”
Section: Loss Processesmentioning
confidence: 99%
“…As características microambientais, entretanto, não apresentaram grande variação entre as estações do ano, com exceção da velocidade da correnteza, bem mais elevada no verão. A velocidade do fluxo de água é um fator bastante importante na distribuição de macroalgas lóticas (Reiter & Carlson 1986, Biggs et al 1998, Francoeur & Biggs 2006. A alta velocidade da correnteza pode exercer pressão negativa sobre os organismos aderidos, sendo que poucas espécies são capazes de suportar a força da correnteza, que muitas vezes carreia grande parte da comunidade.…”
Section: Discussionunclassified
“…Durante o período de inverno, a redução da velocidade da correnteza foi o fator responsável pelo aumento da diversidade de espécies. O fluxo de água tem ação positiva sobre a comunidade aderida quando não age abrasivamente, pois tem papel fundamental no fluxo de nutrientes e na disponibilidade de oxigênio dissolvido (Reiter & Carlson 1986, Ghosh & Gaur 1997.…”
Section: Discussionunclassified