Studies on Growth Rate of Attached Algae Affected by Sun Light and Turbidity in a River Ecosystem

Misaki, Takahiro; Tsuchiya, Mitsukuni

doi:10.2208/proer.36.437

Cited by 1 publication

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“…where h X is the shallowest water depth in the habitat where species X (= V, G, P) can migrate (m). Intrinsic growth rate of producers decreases with increase in the water depth due to attenuation of light in water (Misaki and Tsuchiya, 2008). Thus, this is described as below:…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Investigation of Effects of Species Specific Characteristics on Community Dynamics Affected by Stream Drying in Rivers with Pools as Refugia

Yokota

Fujihara

2017

Journal of Rainwater Catchment Systems

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A mathematical model was presented and parameter studies of the model were performed to investigate changes in the effect of stream drying on aquatic community dynamics in response to species specific characteristics. The community in the model was composed of producers, grazers and predators, and the river was assumed to have poolriffle structure. Grazers and predators could move between the riffle and the pool according to their habitat preference. The temporal scale was enough short that grazers and predators did not reproduce. When the flow reduction began, grazers and predators tended to move from the riffle to the pool by the time the riffle dried up. Both of them could survive in the pool during the stream drying. After the stream drying ended and the water depth recovered, they tended to move from the pool to the riffle. The parameter studies on the sensitivity of grazers and predators to the flow velocity and the predation pressure for grazers revealed following: (i) grazers and predators which had the higher sensitivity to the flow velocity had advantage to reduce the decrease in their density due to the stream drying, (ii) predators had advantage to reduce the decrease in their density due to the stream drying if grazers had the higher sensitivity to the flow velocity, (iii) grazer density in the case of the stream drying became larger than that in the case of no flow reduction if predation pressure for grazers was high relative to the natural mortality rate of grazers, and (iv) the lower sensitivity of predators to the flow velocity had positive effects on grazer density after the stream drying if the predation pressure for grazers was high relative to the natural mortality rate of grazers.

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Section: Mathematical Modelmentioning

confidence: 99%