Diurnal temperature fluctuations in a natural shallow water body

Jacobs, A.F.G.; Jetten, Theo H.; Lucassen, D.C.; Heusinkveld, B.G.; Nieveen, J.P.

doi:10.1016/s0168-1923(97)00039-7

Cited by 40 publications

(32 citation statements)

References 12 publications

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“…Desmids reproduce primarily during dark periods by dividing the vegetative cells in the isthmus plane (Brandham & Godward 1965). We propose that night and early morning temperatures of a shallow pool correlating with air temperature fluctuations (Jacobs et al 1997) are probably most related to size and shape properties of cells as they directly influence the morphogenetic processes following the vegetative cells division. Primary wall formation that precedes deposition of a rigid cellulose secondary wall lasts about 4 to 5 h in Micrasterias (Meindl 1993).…”

Section: Discussionmentioning

confidence: 99%

Temperature-related phenotypic plasticity in the green microalga Micrasterias rotata

Neustupa¹,

Šťastný²,

Hodač³

2008

Aquat. Microb. Ecol.

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Temperature-related morphological variation of Micrasterias rotata (Desmidiales) strain CAUP K604 was investigated using landmark-based geometric morphometrics. Cultured morphotypes were compared with natural populations of M. rotata collected in different seasons at a central European lowland peat bog. In addition, we compared temperature-related variation with morphometric differentiation among other species within the genus Micrasterias. As temperatures increased, the population size of cultured M. rotata generally decreased and shape of the individual temperature groups differed significantly. The high temperature (30°C) population contained the vegetative diploid cells. The shape variation related to temperature was similar to the size-related change in shape. Natural populations of M. rotata were consistently similar to the low temperature cultured populations throughout the season, while the high temperature morphotypes seen in culture were not present in natural samples.

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Section: Discussionmentioning

confidence: 99%

Temperature-related phenotypic plasticity in the green microalga Micrasterias rotata

Neustupa¹,

Šťastný²,

Hodač³

2008

Aquat. Microb. Ecol.

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“…Durante la noche, donde frecuentemente nos encontramos condiciones de viento muy débiles, la mezcla por convección natural como consecuencia del enfriamiento del agua superficial resulta suficiente para mantener homogénea la temperatura del cuerpo de agua. Este mismo fenómeno también se puso de manifiesto en investigaciones anteriores (Losordo y Piedrahita, 1991;Jacobs et al, 1997Jacobs et al, , 1998) que avalan la hipótesis de comportamiento isotermo del tanque. Otro resultado a destacar es la inercia térmica del tanque, que alcanza los máximos diarios de temperatura sobre las 16h, con un retraso de 3 a 4 horas con respecto al máxi-mo de radiación solar interceptada (12h).…”

Section: Resultados Y Discusión Evidencia Experimental Del Comportamiunclassified

“…Los modelos presentados se basan en la formulación matemática de los principios físicos fundamentales que rigen los intercambios de masa y energía, partiendo de las formulaciones propuestas por Losordo y Piedrahita (1991) y Jacobs et al (1997). Las condiciones de contorno iniciales han sido modificadas y adaptadas al caso particular de un tanque evaporímetro.…”

Section: Bases De Los Modelosunclassified

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Simulación de la evaporación horaria a partir de datos meteorológicos

et al. 2005

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Artículo recibido el 24 de septiembre de 2004, recibido en forma revisada el 13 de diciembre de 2004 y aceptado para su publicación el 23 de diciembre de 2004 . Pueden ser remitidas discusiones sobre el artículo hasta seis meses después de la publicación del mismo siguiendo lo indicado en las "Instrucciones para autores". En el caso de ser aceptadas, éstas serán publicadas conjuntamente con la respuesta de los autores.

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“…Eid studied the impact of barrages on fish habitat, but not the actual fish assemblage. Many studies such as (Barbie and Gandara, 1999;Idaho, 2004;Jacobs, 1994;Neumann, 2003;Shanahan, 1984;Wright et al, 1999) have simulated water temperatures from air temperatures, but did not consider the effect of hydraulic structures on water thermal regime. Eid studied this impact but, the simulated water temperature was assumed to be consistent with a linear relation and the lag time between water and air temperature wasn't considered.…”

Section: Introductionmentioning

confidence: 99%

Impact of control structures on assimilative capacity of rivers and fish habitat

Imam

Baradei

2009

Int. J. Environ. Sci. Technol.

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ABSTRACT:This research studies the impact of water level control structures on self-assimilative capacity of rivers and on fish habitat. Constructing a water level control structure in a river reach will alter its hydraulics as well as its water quality, thermal regime and fish habitat. A mathematical model is developed to simulate river hydraulics, water quality, temperature and fish habitat. Diurnal dissolved oxygen concentrations are investigated to show their impact on fish. A case of a Nile River reach was studied to investigate the impact of the existence of the Esna barrage on the water quality and fish in its upstream reach. The barrage has negative impacts on the upstream self-assimilative capacity of the rivers. The waste load that the river could absorb was only 54 % (at low flow) and 78 % (at high flow) of the entire load if no barrage was present. Including in the simulation of the effects of photosynthesis and respiration, the above mentioned percentages were raised to 54 % and 91 %, respectively. Although water level control structures have negative impacts on the upstream self-assimilative capacity of the rivers, they have positive effect on downstream dissolved oxygen concentrations due to reaeration that happens across them. Downstream dissolved oxygen concentration increased by 6 % from its upstream concentration value. The barrage has a positive effect on fish habitat in the upstream section. The weighted usable area of Tilapia fish is doubled in case of barrage existence. The barrage causes a slight decrease in water temperature that reaches an average of 0.13 degree in the month of June.

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Diurnal temperature fluctuations in a natural shallow water body

Cited by 40 publications

References 12 publications

Temperature-related phenotypic plasticity in the green microalga Micrasterias rotata

Temperature-related phenotypic plasticity in the green microalga Micrasterias rotata

Simulación de la evaporación horaria a partir de datos meteorológicos

Impact of control structures on assimilative capacity of rivers and fish habitat

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