Sublethal exposure to UV radiation affects respiration rates of the freshwater cladoceran Daphnia catawba

Photochemistry and Photobiology
Janet M FischerPatrick J Neale

Abstract

We examined the effects of UV radiation (UVR) on metabolic rates of the freshwater cladoceran Daphnia catawba. We exposed D. catawba to UVB for 12 h in a lamp phototron at levels of 2.08 and 4.16 kJ m(-2) both with and without concomitant exposure to UVA and visible photorepair radiation (PRR). We also included a group that received PRR only and a dark control group. Respiration rates were measured for 6 h following exposure. Respiration rates increased by 31.8% relative to the dark control at the lowest level of UVB stress (2.08 kJ m(-2) UVB with PRR), whereas respiration was inhibited by 70.3% at the highest stress level (4.16 kJ m(-2) UVB without PRR). Survival rates in the group that received PRR only and the group exposed to 2.08 kJ m(-2) and PRR were not significantly different from that in the control group; however, the survival rate was reduced for all other UVR exposures. We hypothesize that enhanced respiration rates reflect energetic costs related to repair of cellular components damaged by sublethal levels of UVR. Increases in respiration rate of the magnitude we found in our experiment could significantly reduce energetic reserves available for growth and reproduction, especially in cases where these costs are inc...Continue Reading

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Citations

Jan 29, 2011·Proceedings. Biological Sciences·Lesley A AltonCraig E Franklin
Jul 25, 2007·Photochemistry and Photobiology·Rodrigo J GonçalvesE Walter Helbling
Jul 6, 2012·Photochemistry and Photobiology·Judith D HuebnerWilliam H Husarewycz
Mar 3, 2012·PloS One·María Sol SouzaEsteban Balseiro
Jul 21, 2016·PloS One·Sandra J ConnellyMaria J González
Apr 6, 2017·PloS One·Carla Eloisa Fernández, Danny Rejas
Mar 28, 2007·Photochemistry and Photobiology·Lucia Fidhiany, Klaus D Winckler
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Dec 7, 2016·Environmental Science and Pollution Research International·Rongxue CuiYoun-Joo An
Jan 22, 2011·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·D-P HäderR C Worrest
Dec 2, 2020·Environmental Pollution·Laura WolinskiEsteban Balseiro

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