Presentation Title

Occurrence and Detection of Selected Herbicides in Estuaries

Faculty Mentor

Sudarshan Kurwadkar

Start Date

23-11-2019 10:00 AM

End Date

23-11-2019 10:45 AM

Location

167

Session

poster 3

Type of Presentation

Poster

Subject Area

engineering_computer_science

Abstract

Occurrence of a variety of herbicides in the Morro Bay Estuary has led to the declining of eelgrass populations. According to one estimate, more than 90% of eelgrass loss in the area has been attributed to the surface runoff originating from two watersheds with large-scale agricultural operations that routinely use herbicides. Seagrass plays an important role in the marine environment as it sustains marine life ecosystem, absorb greenhouse gasses, and reduces coastal erosion as such it is imperative that occurrence of herbicide and its impact on delicate marine ecosystem should be pursued with great priority. Oxyfluorfen, Napropamide, Simazine, and Glyphosate herbicides are commonly used to control broad-leaf weeds in these agricultural areas. The objective of this research is to develop an analytical protocol for accurate detection of these herbicides not only in aqueous samples but also in sediments found in the estuary; investigate the persistence of herbicides in sediments and the decline of eelgrass populations whether it be from pesticides or other factors. We hypothesize that given the similarities between marine eelgrass and broad-leaf weeds, it is expected that the herbicides considered in this study are the principal source of eelgrass decline. Five types of grass grown in a similar environment will be exposed to a known concentration of herbicides and studied and compared with the control sample. The comparative analysis will determine how herbicides affect the seagrass population and at what concentration and duration are critical to the decline of the seagrass population.

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Nov 23rd, 10:00 AM Nov 23rd, 10:45 AM

Occurrence and Detection of Selected Herbicides in Estuaries

167

Occurrence of a variety of herbicides in the Morro Bay Estuary has led to the declining of eelgrass populations. According to one estimate, more than 90% of eelgrass loss in the area has been attributed to the surface runoff originating from two watersheds with large-scale agricultural operations that routinely use herbicides. Seagrass plays an important role in the marine environment as it sustains marine life ecosystem, absorb greenhouse gasses, and reduces coastal erosion as such it is imperative that occurrence of herbicide and its impact on delicate marine ecosystem should be pursued with great priority. Oxyfluorfen, Napropamide, Simazine, and Glyphosate herbicides are commonly used to control broad-leaf weeds in these agricultural areas. The objective of this research is to develop an analytical protocol for accurate detection of these herbicides not only in aqueous samples but also in sediments found in the estuary; investigate the persistence of herbicides in sediments and the decline of eelgrass populations whether it be from pesticides or other factors. We hypothesize that given the similarities between marine eelgrass and broad-leaf weeds, it is expected that the herbicides considered in this study are the principal source of eelgrass decline. Five types of grass grown in a similar environment will be exposed to a known concentration of herbicides and studied and compared with the control sample. The comparative analysis will determine how herbicides affect the seagrass population and at what concentration and duration are critical to the decline of the seagrass population.