Rotifer Ecotoxicology: Behavioral Avoidance of Toxicants

Show simple item record Weigel, Emily Grace en_US 2010-05-28T15:23:34Z 2010-05-28T15:23:34Z 2008-05-05 en_US
dc.description.abstract Previous 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.publisher Georgia Institute of Technology en_US
dc.subject Rotifer en_US
dc.subject Toxicant en_US
dc.subject Behavior en_US
dc.subject Cadmium en_US
dc.subject Pentochlorophenol en_US
dc.subject Flutamide en_US
dc.subject Progesterone en_US
dc.subject Selenium en_US
dc.subject Lead en_US
dc.subject Conditioned medium en_US
dc.subject Copper en_US
dc.subject Mercury en_US
dc.title Rotifer Ecotoxicology: Behavioral Avoidance of Toxicants en_US
dc.type Undergraduate Thesis en_US
dc.contributor.department Biology en_US
dc.description.advisor Committee Member/Second Reader: Kubanek, Dr. Julia; Faculty Mentor: Snell, Dr. Terry en_US

Files in this item

Files Size Format View
weigel_emily_g_200705_ro.pdf 202.3Kb PDF View/ Open

This item appears in the following Collection(s)

Show simple item record