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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