The Role of Genetic Diversity in Restoration Success for Vallisneria americana in the Chesapeake Bay
Principal Investigator:Katharina A. M. Engelhardt
Start/End Year:2007 to 2010
Institution:Appalachian Laboratory, University of Maryland Center for Environmental Science
Co-Principal investigator:Maile C. Neel, University of Maryland, College Park
Objectives: Are objectives are to 1) quantify patterns of genetic diversity in natural, restored and cultured populations of Vallisneria americana 2) quantify relationships between genetic diversity, ecological characteristics, and restoration success; and 3) culture different genotypes and population sources in support of conducting greenhouse experiments. This crosscutting interdisciplinary research specifically responds to several research areas outlined in the Maryland Sea Grant solicitation for research in the Chesapeake Bay. Methodology: We will use a combination of standard genetic techniques to characterize genetic diversity of 6 natural, 6 restored, and 6 cultured populations of Vallisneria americana present in the Chesapeake Bay. The research is novel in linking three types of genetic diversity with ecological functioning and restoration success. The ecological portion of the work will be conducted in greenhouse mesocosms by propagating distinct genotypes of V. americana and planting populations of different genetic diversities in greenhouse mesocosms. Rationale: The research investigates the influence of genetic diversity on ecosystem functioning and restoration success for the submersed aquatic plant species Vallisneria americana. It also provides information on how genetic approaches can improve restoration and conservation.
Lloyd, MW; Tumas, HR; Neel, MC. 2018. Limited pollen dispersal, small genetic neighborhoods, and biparental inbreeding in Vallisneria americana. American Journal of Botany 105(2):227-240. doi:10.1002/ajb2.1031. UM-SG-RS-2018-06.
Marsden, BW; Engelhardt, KAM; Neel, MC. 2013. Genetic rescue versus outbreeding depression in Vallisneria americana: Implications for mixing seed sources for restoration. Biological Conservation 167:203-214. doi:10.1016/j.biocon.2013.08.012. UM-SG-RS-2013-12.
Lloyd, MW; Burnett, RK; Engelhardt, KAM; Neel, MC. 2012. Does genetic diversity of restored sites differ from natural sites? A comparison of Vallisneria americana (Hydrocharitaceae) populations within the Chesapeake Bay. Conservation Genetics 13(3):753-765. doi:10.1007/s10592-012-0324-3. UM-SG-RS-2012-05.
Lloyd, MW; Burnett, RK, Jr.; Engelhardt, KAM; Neel, MC. 2011. The structure of population genetic diversity in Vallisneria americana in the Chesapeake Bay: implications for restoration. Conservation Genetics 12(5):1269-1285. doi:10.1007/s10592-011-0228-7. UM-SG-RS-2011-14.