Journal article
Modeling Performance and Settlement Windows of Larval Eastern Oyster (Crassostrea virginica) in Delaware Bay
Journal of shellfish research, v 42(3), pp 437-463
03 Jan 2024
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Oyster population maintenance and growth require a sufficient larval supply competent for metamorphosis and settlement. Larval performance, in terms of growth, development, survival, and metamorphic success, determines the capacity for a larval cohort to effectively settle and establish into an existing population. Exogenous factors influencing larval development include temperature, salinity, food quantity, and food quality. A sufficient diet, composed of balanced protein, lipids, and carbohydrates to meet larval nutritional demands, is required to promote successful metamorphosis. To evaluate the influence of these exogenous factors on oyster settlement potential in Delaware Bay, a well-established biochemically based Crassostrea gigas (Thunberg, 1793) larval model was adapted to simulate Crassostrea virginica (Gmelin, 1791) larval performance under in situ environmental conditions measured during the 2009 to 2011 reproductive seasons at 10 sites across the salinity gradient of Delaware Bay. Variation in the initial egg size and lipid content, and larval food assimilation efficiency was incorporated into the model to represent potential within-cohort phenotypic variability. The middle portion of Delaware Bay along the New Jersey shoreline, bridging the 15-salinity line, generated the most successful larvae each year, whereas the low-salinity reach, on the Delaware side, and Nantuxent Point Reef had more variable success. Survivorship was a function of adequate temperatures and salinities, sufficient food quantity, and favorable food quality defined in part by the protein-to-(lipid-plus-carbohydrate) ratio. Most settlement was predicted by the model to occur between July and September of each year. To validate the model, estimated settlement windows were compared with calculated settlement windows derived from recruitment observations on yearly shell plants. Modeled and recruitment-derived settlement windows agreed well with each other and verified the capacity of the model to accurately forecast in situ larval performance. The oyster larval model, based on measures of lipid, protein, and carbohydrate, successfully passed an important field test, demonstrating the potential of such biochemically based models to reliably evaluate larval performance under real-world conditions.
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Details
- Title
- Modeling Performance and Settlement Windows of Larval Eastern Oyster (Crassostrea virginica) in Delaware Bay
- Creators
- James C. Klein - University of Southern MississippiEric N. Powell - University of Southern MississippiDanielle A. Kreeger - Drexel UniversityKathryn A. Ashton-Alcox - Rutgers, The State University of New JerseyDavid Bushek - Rutgers, The State University of New JerseyXiaodong Zhang - Stennis Space CenterRoger L. Thomas - Drexel UniversityJohn M. Klinck - Old Dominion UniversityEileen E. Hofmann - Old Dominion University
- Publication Details
- Journal of shellfish research, v 42(3), pp 437-463
- Publisher
- National Shellfisheries Association
- Number of pages
- 27
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Web of Science ID
- WOS:001167650400008
- Scopus ID
- 2-s2.0-85181914015
- Other Identifier
- 991021818099904721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Fisheries
- Marine & Freshwater Biology