ERDC, 欧美AV work to re-establish Gulf reefs
Tue, 12/21/2021 - 02:59pm | By: Jason Scott
Dr. Amy Yarnall, Oak Ridge Institute for Science and Education postdoctoral fellow, and Austin Draper, graduate student at 欧美AV, pull in a gill net for Gulf Sturgeon. (Photo credit: Kati Wright, The University of Southern Mississippi)
Kasea Price, research technician at 欧美AV, deploys an acoustic telemetry receiver to monitor for fish movements around open bottom habitats near Bay of St. Louis. (Photo credit: Alfonso Cohuo, 欧美AV)
Benthic infaunal sample. (Photo credit: Michael Andres, The University of Southern Mississippi)
Kasea Price, research technician at 欧美AV, monitoring a tagged juvenile Gulf Sturgeon prior to release. (Photo credit: Elizabeth Greenheck, 欧美AV)
欧美AV graduate students and research technicians hold an adult Gulf Sturgeon captured in the Pascagoula River. Pictured from left: Elizabeth Greenheck, Alfonso Cohuo, Austin Draper, Kasea Price, and Kati Wright. (Photo credit: Michael Andres, 欧美AV)
VICKSBURG, Miss. 鈥� The U.S. Army Engineer Research and Development Center (ERDC), The University of Southern Mississippi (欧美AV), the University of Kentucky and the Mississippi Department of Marine Resources (MDMR) continue work on a three-year collaboration to create oyster reef habitat in the northern Gulf of Mexico for experimental purposes.
The project鈥檚 primary objective is to investigate methods for optimizing oyster habitat restoration in the area which would ultimately lead to oyster population recovery and enhancement of ecosystem services in coastal waters. A secondary objective is to evaluate whether the creation of oyster reefs as part of coastal restoration activities has any impacts on the use of critical habitat by Gulf sturgeon, a federally protected species.
A robust oyster population is vital to the ecology and the economy of the region.
In early 2021, the research team began evaluating potential reef sites off the coast of Mississippi. Specifically, they were looking for areas that offer favorable environmental conditions for oysters within the footprint of Gulf sturgeon habitat.
鈥淭he plan is to create oyster structures at two sites. Each site will have two 50-acre leases, with each lease having eight one-acre reef plots,鈥� said Dr. Safra Altman, a research ecologist with ERDC鈥檚 Environmental Laboratory and ERDC鈥檚 technical lead for the project. 鈥淲e believe we have now identified two sites that will allow us to best fulfill both project objectives.鈥�
Currently, all of Mississippi鈥檚 waters within the Mississippi Sound are federally designated critical habitat for Gulf sturgeon. However, exactly how the fish use and interact with the various habitat subtypes鈥搇ike open bottom or oyster reef鈥搘ithin the Mississippi Sound is unknown.
The project aims to determine what positive and negative impacts, if any, occur to Gulf sturgeon critical habitat by quantifying changes in use by acoustic telemetry tagging studies, sediment characteristics and Gulf sturgeon prey density in response to oyster reef creation. This data will allow resource managers to make informed decisions on how to best achieve restoration while simultaneously conserving Gulf sturgeon.
The research team submitted permit applications for the proposed reef sites earlier this year. The MDMR held a public comment period in early November and the U.S. Army Corps of Engineers (USACE) will be accepting public comments soon to give citizens the opportunity to provide feedback on the proposed reef site locations before construction begins.
鈥淕etting the permits reviewed and approved is the next major step of this project,鈥� said Dr. Read Hendon, director of the Gulf Coast Research Laboratory and 欧美AV project lead. 鈥淗owever, our researchers have already started data collection in and around the proposed reef sites so that we have baseline information on ecological conditions before the reefs are created.鈥�
Dr. Mike Andres, assistant research professor at 欧美AV, and graduate students from his lab are taking the lead on the Gulf sturgeon component of the project. The 欧美AV and ERDC researchers are currently tagging juvenile and subadult Gulf sturgeon in the Pearl and Pascagoula rivers in expectation of using these various habitats.
鈥淒r. Andres鈥� lab, along with ERDC researchers and collaborators from the University of Kentucky sampled sediments and potential Gulf sturgeon prey species in Mississippi Sound during August to gather preliminary data for these regions,鈥� Altman said. 鈥淎n acoustic telemetry array over open-bottom habitats where oyster lease sites are expected to be created and over oyster reef habitats was deployed to quantify habitat characteristics鈥搒ediment composition and prey items鈥揳nd Gulf sturgeon use prior to creation of the oyster reef treatments.鈥�
Gulf sturgeon are not the only species to be influenced by reef creation. The 欧美AV team will also be tagging finfish species known to feed on oyster reefs, such as black drum and sheepshead. The acoustic receiver arrays established over different habitats are expected to yield additional data from other 欧美AV and MDMR collaborators tagging other recreational fish species within the Mississippi Sound, including red drum, southern flounder and Atlantic tripletail.