Boundary layers and abalone postlarval culture: Preliminary studies

Searcy-Bernal, Ricardo

doi:10.1016/0044-8486(95)01187-0

Cited by 23 publications

(21 citation statements)

References 18 publications

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“…These microenvironments, which are home to a diverse array of meiofauna, are now being described for the first time. Oxygen boundary layers described in the literature are of the order of 2 mm and are dependent on a number of environmental factors (Jørgensen & Des Marais 1990, Searcy-Bernal 1996, Ploug et al 1999, Kohler-Rink & Kuhl 2000.…”

Section: Discussionmentioning

confidence: 99%

“…ns: not significant where flow conditions reduce the depth of boundary layers relative to that measured under static conditions (Kaspar 1992, Zhang & Bishop 1994, Searcy-Bernal 1996, Kohler-Rink & Kuhl 2000. The response time of oxygen tension to changes in flow conditions was seen to be rapid, being completed in approximately 1 min.…”

Section: Discussionmentioning

confidence: 99%

“…Boundary layers develop over stationary objects in moving water, where flow velocity decreases towards the solid-fluid interface leading to gradients of environmental parameters within layers. The impact of such gross flow gradients on organisms in aquatic systems is well documented (Kaspar 1992, Searcy-Bernal 1996, yet little attention has been focussed on oxygen micro-gradients that may occur in the diffusive boundary layer close to the surface of a photosynthesising plant in a water body.…”

Section: Introductionmentioning

confidence: 99%

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Hyperoxic boundary layers inhabited by the epiphytic meiofauna of Fucus serratus

Irwin

Davenport²

2002

Mar. Ecol. Prog. Ser.

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Opto-chemical microsensors were used to gather information about oxygen levels close to the thallus surface of Fucus serratus L. Oxygen tensions as high as 560% air saturation were recorded at the seaweed surface in seawater under static conditions at a light intensity of 229.5 µmol photon m -2 s -1. This level of oxygen supersaturation was restricted to a thin layer directly above the seaweed surface and a steep oxygen gradient was observed through the boundary layer, which extended to a distance of 1 to 2 mm in a static water body. Although remaining considerably elevated relative to the oxygen tension in the surrounding water, oxygen tensions at the seaweed surface were reduced under flow conditions. The thickness of the oxygen-supersaturated boundary layer decreased to less than 1 mm under flow conditions. However, flow rate itself did not have a significant effect on oxygen tensions at the seaweed surface or on the depth of the boundary layer. A rapid reaction of oxygen tension within the boundary layer was observed in response to initiation or cessation of flow. In darkness, under static conditions, the oxygen tension at the seaweed surface decreased to as little as 40% air saturation. Under these conditions, oxygen tension increased through the boundary layer, reaching levels similar to the surrounding water in less than 1 mm. These data indicate that small epiphytic animals (copepods, nematodes etc.) encounter highly hyperoxic conditions during daytime, even when there is water flow over seaweed. They are therefore exposed to the possibility of hyperoxic/free radical damage, even though living in an apparently benign environment.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hyperoxic boundary layers inhabited by the epiphytic meiofauna of Fucus serratus

Irwin

Davenport²

2002

Mar. Ecol. Prog. Ser.

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“…Las intensidades altas de luz en una biopelícula ocasionan una supersaturación de oxígeno que pudiera afectar a las postlarvas (Searcy-Bernal 1996). Aunque hay evidencia de que éstas pueden tolerar hasta un 150% de saturación de oxígeno (Loipersberger 1996), no se conocen los efectos subletales potenciales.…”

Section: Efecto De La Condición De Luzunclassified

“…High light intensities cause oxygen supersaturation in the biofilm that can affect postlarvae (Searcy-Bernal 1996). Though there is evidence that postlarvae can tolerate up to 150% of oxygen saturation (Loipersberger 1996), the potential sublethal effects are not known.…”

Section: Efecto De La Condición De Luzmentioning

confidence: 99%

Effect of darkness on the early postlarval development of Haliotis corrugata abalone fed different diatom densities

Gorrostieta-Hurtado¹,

Searcy-Bernal²,

Anguiano-Beltrán³

et al. 2009

Cienc. Mar.

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Four-day-old postlarvae of the abalone Haliotis corrugata were exposed to different diatom densities (Navicula incerta, 0 to 8000 cells mm–2) under two illumination conditions: constant light (19–21 µmol quanta m–2 s–1) and darkness. The effect of these two factors on postlarval grazing rate, survival, and growth was evaluated. The experiment was conducted for 14 days in 10-mL sterile wells following a split-plot experimental design with three replicates per treatment. The highest grazing rate was observed in the 2000 cells mm–2 density treatment and it was higher in darkness (196 ± 67 cells pl–1 h–1) than in constant light (139 ± 36 cells pl–1 h–1). Mean survival was also higher in darkness (59%) than under constant light (44%), as was mean growth rate (20 and 14 µm d–1, respectively). Growth rate at the end of the experimental period tended to decrease with the increase in diatom density. Higher grazing and growth rates in darkness reinforce the hypothesis that the nocturnal habits of abalone develop soon after metamorphosis and not at juvenile stages as usually considered.

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Influence of a Marine Diatom on the Embryonic Toxicity of 17α-Ethynylestradiol to the Abalone Haliotis diversicolor supertexta

Liu

Tam

Guan

et al. 2012

Water Air Soil Pollut

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Boundary layers and abalone postlarval culture: Preliminary studies

Cited by 23 publications

References 18 publications

Hyperoxic boundary layers inhabited by the epiphytic meiofauna of Fucus serratus

Hyperoxic boundary layers inhabited by the epiphytic meiofauna of Fucus serratus

Effect of darkness on the early postlarval development of Haliotis corrugata abalone fed different diatom densities

Influence of a Marine Diatom on the Embryonic Toxicity of 17α-Ethynylestradiol to the Abalone Haliotis diversicolor supertexta

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