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dc.contributor.authorWeigel, Emily Graceen_US
dc.date.accessioned2010-05-28T15:23:34Z
dc.date.available2010-05-28T15:23:34Z
dc.date.issued2008-05-05en_US
dc.identifier.urihttp://hdl.handle.net/1853/33472
dc.description.abstractPrevious rotifer ecotoxicology studies have shown varied effects of sublethal concentrations of hormones and metals on species but have largely ignored toxicant effects on behavior. Given the importance of chemical cues for mating, grazing, and predator avoidance, the phenomenon of behavioral response to pollutants is a critical topic impacting rotifer survival and reproduction. Dual- and tri-chamber test slides similar to Y-tubes were developed to test rotifer behavioral responses to sublethal concentrations of several toxicants. Rotifers were placed in a start chamber between a control chamber and test chamber containing a toxicant, and after fifteen minutes, rotifer distribution in all chambers was recorded. No significant distributional effects were observed for cadmium (2μg/L), pentochlorophenol (2μg/L), flutamide (8μg/L) nor progesterone (8μg/L). Significant deviation from a random distribution was recorded for selenium (2μg/L), lead (8μg/L), and rotifer conditioned medium. In addition, significant avoidance was found for copper (2μg/L) and mercury (0.2μg/L), even in tests with the start chamber containing the toxicant. These data suggest that rotifers can detect and avoid certain toxicants at sublethal levels. Avoidance often occurs at levels below published lethal concentrations (LC50s) on which many water quality criteria are based. Avoidance can alter rotifer survival and reproduction, leading to reductions in rotifer abundance and energy transfer to higher trophic levels.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectRotiferen_US
dc.subjectToxicanten_US
dc.subjectBehavioren_US
dc.subjectCadmiumen_US
dc.subjectPentochlorophenolen_US
dc.subjectFlutamideen_US
dc.subjectProgesteroneen_US
dc.subjectSeleniumen_US
dc.subjectLeaden_US
dc.subjectConditioned mediumen_US
dc.subjectCopperen_US
dc.subjectMercuryen_US
dc.titleRotifer Ecotoxicology: Behavioral Avoidance of Toxicantsen_US
dc.typeUndergraduate Thesisen_US
dc.contributor.departmentBiologyen_US
dc.description.advisorCommittee Member/Second Reader: Kubanek, Dr. Julia; Faculty Mentor: Snell, Dr. Terryen_US


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