Title

Life History Patterns and the Spatial and Trophic Ecology of Batoids in a Northern Gulf of Mexico Estuary

Advisor

Drymon, J. Marcus

Committee Member

Ajemian, Matthew J.

Committee Member

Colvin, Michael E.

Date of Degree

1-1-2019

Original embargo terms

Visible to MSU only for 2 years

Document Type

Graduate Thesis - Open Access

Degree Name

Master of Science

College

College of Forest Resources

Department

Department of Wildlife, Fisheries and Aquaculture

Abstract

Mobile Bay is a dynamic estuary home to a diverse faunal assemblage, which includes several species of batoid fishes (Chondrichthyes: Batoidea). To better understand the dynamics of this batoid assemblage, batoids were opportunistically sampled from 440 trawls performed in and around Mobile Bay from 2016 to 2017. The species Hypanus sabinus and Gymnura lessae were the most common batoids collected (86% of catch). PERMANOVA analysis found the variables day length, location, year, and water temperature best described catch variability. Furthermore, stomach contents from Gymnura lessae were sampled to investigate its diet. Most prey were heavily degraded, thus DNA metabarcoding was used to enhance prey identification. Most prey (88.3%) were from the families Sciaenidae and Engraulidae, and the variables season and sex best explained the dietary variability. These data will be necessary for modeling potential habitat and dietary shifts of Mobile Bay’s batoids as climate change and anthropogenic disturbances alter estuaries.

URI

https://hdl.handle.net/11668/21224

Comments

Otoliths||Dauphin Island Sea Lab||Marine||Stingray

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