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Judith D. Huebner, Nancy L. Loadman, Murray D. Wiegand, Erwin Huebner, Daniel J. Palitsky and William H. Husarewycz UVB Radiation Affects Growth, Reproduction and Tissue Structure of Daphnia magna Across Several Temperatures Photochemistry and Photobiology 89

Article first published online: 2 AUG 2012 | DOI: 10.1111/j.1751-1097.2012.01197.x

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UVB radiation (UVBR) inhibited growth, reduced reproductive output and caused production of smaller offspring in Daphnia magna. These consequences were more severe at 30°C than at 20–25°C. UVBR caused damage to the gut including disruption of the brush border and vacuolation of epithelial cells (Figure). Disruption of the gut will reduce absorptive capacity and thus the energy supply for growth, maintenance and reproduction. With higher metabolic rates at higher temperatures, further reduction in reproductive capacity is expected. Combined effects of higher temperature and UVBR penetration associated with climate change may compromise populations of pelagic zooplankton such as Daphnia.

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