Eastern Oysters Crassostrea virginica settle near inlets in a lagoonal estuary: Spatial and temporal distribution of recruitment in mid-Atlantic Coastal Bays (Maryland, USA)

Date 2022
Author(s) Farmer Madeline1, Cullen Daniel1, Stevens BradleyORCID1
Affiliation(s) 1 : University of Maryland Eastern Shore, USA
DOI 10.17882/86685
Publisher SEANOE
Keyword(s) Oyster, Crassostrea virginica, Larval recruitment, Settlement, Ecosystem services, Lagoonal estuary, Restoration, Maryland, Mid-Atlantic
Abstract

Background. Declines of the Eastern oyster, Crassostrea virginica, and its numerous ecological benefits have spurred oyster restoration initiatives. Successful restoration of a self-sustaining oyster population requires evaluating the temporal and spatial patterns of recruitment (settlement and survival) of oyster larvae in the target waterbody. Restoration of the eastern oyster population in the Maryland Coastal Bays (MCBs), U.S.A., a shallow lagoonal estuary, is of interest to federal and state agencies, but the location and timing of natural recruitment is not known.

Methods. We assessed the spatial and temporal variation in oyster larvae recruitment throughout the MCBs using horizontal ceramic tiles and PVC plates. Newly settled oyster larvae (recruits) were monitored biweekly from June to September 2019 and 2020 at 12 sites in the MCBs and a comparison site in Wachapreague, Virginia. Water quality parameters (temperature, salinity, dissolved oxygen, turbidity, and pH) were also measured. The objectives of this study were to determine 1) the most effective substrate design for monitoring oyster recruitment, 2) the spatial and temporal distribution of oyster larvae recruitment in the MCBs, and 3) patterns in oyster larvae recruitment that would be applicable to other lagoonal estuaries.

Results. 1) Ceramic tiles were more effective than PVC plates for recruiting oyster larvae; 2) Peak settlement began during the period from late June through July, and oyster recruitment was greatest at sites closest to the Ocean City and Chincoteague inlets; 3) Areas near broodstock that have long flushing rates to retain larvae, may provide the best environments for recruitment of oysters to lagoonal estuaries.

Discussion. As the first study on oyster larvae recruitment in the MCBs, our results provide insight into their spatial and temporal distribution, methods that can serve as a foundation for future recruitment studies in other lagoonal estuaries, and baseline data that can be used to inform stakeholders and evaluate the success of oyster restoration projects in MCBs.

Licence CC-BY-NC-ND
Data
File Size Format Processing Access
Data file descriptions 729 bytes TEXTE Open access
Oyster counts and water quality 231 KB CSV Processed data Open access
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How to cite 

Farmer Madeline, Cullen Daniel, Stevens Bradley (2022). Eastern Oysters Crassostrea virginica settle near inlets in a lagoonal estuary: Spatial and temporal distribution of recruitment in mid-Atlantic Coastal Bays (Maryland, USA). SEANOE. https://doi.org/10.17882/86685