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Effects of light and salinity on post-bleaching recovery in the jellyfish Cassiopea SP
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Effects of light and salinity on post-bleaching recovery in the jellyfish Cassiopea SP

Megan Elizabeth Maloney
University of West Florida,
Master of Science (MS), University of West Florida
2019

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Abstract

Cassiopea sp. was collected from the Florida Keys and used to study the effects of environmental conditions after a warming event to induce photobleaching. Jellyfish were bleached by elevating the temperature to 33 °C. Wet weight, bell diameter, pulse frequency, zooxanthellae, protein, carbohydrate, and lipid were measured in bleached and non-bleached individuals held under a salinity of 30 g kg-1, 35 g kg-1, and 40 g kg-1, and either full light exposure or partial shading after eight weeks. There were no statistical differences between any of the treatment means for bleaching, light, or salinity level; however, biological parameters indicated salinity could potentially cause a change in the physical and metabolic properties of the jellyfish. An initial sample indicated that Cassiopea sp. in this study may not have fully bleached at 33 °C; that outcome, together with the bleached group recovering to non-bleached levels, indicates Cassiopea sp. is resilient/resistant to some thermal increase.
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