Ultraviolet Radiation and Daphnia Respiration in Context: The Facts

Fischer, Janet M.; Fields, Phillip A.; Pryzbylkowski, P. G.; Nicolai, Jaclyn L.; Neale, Patrick J.

doi:10.1111/j.1751-1097.2006.tb09837.x

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Short-term global change impact on plankton metabolic responses: Previous studies have shown that a short-term UVR exposure can inhibit photosynthesis (Sobrino et al, 2008;Cabrerizo et al, 2014) or increase respiration in both phytoplankton and zooplankton (Fischer et al, 2006a;Hamilton, 2011). In our experiment, however, phytoplankton under the Present condition were benefited when exposed to UVR (negative values in Fig.…”

Section: Discussionmentioning

confidence: 99%

Global change effects on plankton community structure and trophic interactions in a Patagonian freshwater eutrophic system

et al. 2017

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The short-and mid-term effects of a simulated global change scenario (i.e., Future) of increased nutrients, acidification, and solar radiation, in the presence or absence of grazers, were evaluated on a freshwater plankton community of Patagonia, Argentina. We used a cluster experimental design with microcosms incubated outdoors simulating the in situ (i.e., Present) and the Future conditions. Short-term changes in net productivity and respiration, together with mid-term changes in the community (abundance, biomass, and phytoplankton cell size) were measured. Phytoplankton had lower net productivity and higher respiration and zooplankton had, in general, higher respiration under the Future than that under the Present condition when organisms were exposed to UVR. The mid-term impacts of the Future condition were neither significant on zooplankton abundances, nor in phytoplankton abundances, biomass, and cell size. Nevertheless, the zooplankton-phytoplankton interaction strength was greater under the Future condition. Zooplankton exerted a strong top-down pressure, regardless of the experimental scenarios, grazing preferentially on small phytoplankton cells, thus decreasing their abundances and biomass. Overall, there were significant short-term impact of our Future global change scenario; however, its effects on midterm time scales were not significant, and indeed, the zooplankton top-down pressure was the main driver that shaped the phytoplankton community.

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Section: Discussionmentioning

confidence: 99%

Global change effects on plankton community structure and trophic interactions in a Patagonian freshwater eutrophic system

et al. 2017

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“…In this case, the measuring light was periodically interrupted by a shutter to keep its effect on the course of the reaction as slight as possible. Measurement were made on a cylindrical cuvette (Suprasil; internal diameter d = 14 mm, pathlength I = 10 cm; see [41]) or a cuvette of rectangular cross-section (Suprasil, internal dimensions 4 x 10 mm, pathlength I = 10 cm; see [42]). Thermostating of the cuvettes was performed by a Cu block in a horizontal fitted Dewar flask (Suprasil) to & 0.2".…”

Section: Uv-spectroscopically Determined Formal Analysis Of Reaction mentioning

confidence: 99%

ChemInform Abstract: Stereoselective Ring Opening of Electronically Excited Cyclohexa‐2,4‐ dienones: Cause and Effect.

Quinkert

1997

ChemInform

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The two conformers of a cyclohexa-2,4-dienone with different substituents at C(6) on irradiation are believed to undergo ring opening stereospecifically affording a mixture of two configurationally isomeric diene-ketenes (and descendents thereof). Exceptions are generally found for those dienones with one C and one 0 substituent or even with two C substituents, if one of them carries a polar group at a site able to interact through space with the ring C=O group. In these cases, only one of the two anticipated diene-ketenes (and descendents thereof) is produced. A thorough investigation of the photochemistry of a series of structurally different cyclohexa-2,4-dienones on analytical as well as on preparative scale extends our mechanistic knowledge of the various routes from diene-ketenes into a variety of compound classes. Novel compound classes accessible to diene-ketenes are seven-membered carbocycles (by intramolecular aldolization of the zwitterion of appropriately substituted, transiently formed diene-(N,O)-ketene acetals) and j-lactams (by Staudinger reaction).

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A novel method for preventing surface film entrapment of water fleas and its application for toxicity testing with heavy metals

Cui

Kwak

2016

Environ Sci Pollut Res

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Some water fleas such as Daphnia galeata and Bosmina longirostris are difficult to culture and use in ecotoxicity testing since they can easily become entrapped at the surface film. Cetyl alcohol was the most prevalent chemical used to prevent the entrapment of water fleas in previous studies. However, cetyl alcohol possesses a number of disadvantages including its toxicity and water insolubility. This study presents a novel method for preventing surface film entrapment of the water flea D. galeata and B. longirostris acute testing. We examined the applicability of saponin extracts from Quillaja saponaria, natural surfactants commonly extracted from plants. Its application of saponin extracts was tested by ecotoxicity testing of heavy metals. Based on the acute test results for heavy metals, a concentration of 1.0 mg/L of saponins was determined as suitable for preventing surface film entrapment of D. galeata and B. longirostris with negligible adverse effects. This study proposes a novel method for preventing surface film entrapment of D. galeata and B. longirostris through the application saponins and could be valuable to make them suitable test species in ecotoxicity testing.

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Ultraviolet Radiation and Daphnia Respiration in Context: The Facts

Cited by 3 publications

References 20 publications

Global change effects on plankton community structure and trophic interactions in a Patagonian freshwater eutrophic system

Global change effects on plankton community structure and trophic interactions in a Patagonian freshwater eutrophic system

ChemInform Abstract: Stereoselective Ring Opening of Electronically Excited Cyclohexa‐2,4‐ dienones: Cause and Effect.

A novel method for preventing surface film entrapment of water fleas and its application for toxicity testing with heavy metals

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