Herbicidal-induced effects in rivulus mangrove killifish, Kryptolebias marmoratus.

Herbicidal-induced effects in rivulus mangrove killifish, Kryptolebias marmoratus.

    Presenter(s)

    Lauren Elizabeth Corrigan

    Comments

    Presentation: 10:45-12:00, Kennedy Union Ballroom

    Description

    Glyphosate, a key ingredient in roundup, has been increasingly present in aquatic systems due to agricultural runoff. High doses of this toxin causes defects in organisms due to its ability to disrupt physiological processes as an endocrine disruptor. To evaluate the effects of glyphosate on non-target species in aquatic environments, I used the mangrove rivulus fish (Kryptolebias marmoratus). They are self-fertilizing amphibious hermaphrodites with the ability to escape water in times of poor quality. These fish produce genetically identical offspring, so we can look at how variation in toxicant exposure alters phenotypes across genetically identical fish. Newly hatched larvae were treated for 96 hours with three different concentrations of glyphosate: control (0mg/L), environmentally relevant (.01 mg/L), and high (1 mg/L). Phenotypic traits of behavior, morphology, and reproductive traits were measured. Fish with relevant doses were predicted to show adaptive jumping behavior while deficits in other traits were expected in all glyphosate dosages. We found fish exposed to both high and relevant concentrations showed behavioral deficits. A trend at low doses was observed at the beginning of maturity; however, this did not persist through adulthood. Fish treated with high concentrations had later reproductive deficits. There was no evidence to support the relevant adaptive hypothesis. This study displayed the importance of maintaining healthy ecosystems by providing evidence even relevant concentrations of herbicide may be harmful to aquatic organisms.

    Publication Date

    4-17-2024

    Project Designation

    Graduate Research

    Primary Advisor

    Karolyn M. Hansen

    Primary Advisor's Department

    Biology

    Keywords

    Stander Symposium, College of Arts and Sciences

    Institutional Learning Goals

    Scholarship; Critical Evaluation of Our Times; Vocation

    Herbicidal-induced effects in rivulus mangrove killifish, Kryptolebias marmoratus.

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