Date of Award
Master of Science (MS)
Ocean, Coastal, and Earth Sciences
Dr. Carlos E. Cintra-Buenrostro
Dr. Alejandro Fierro-Cabo
Dr. Engil Pereira
Black mangrove (Avicennia germinans) in south Texas provide ecosystem services and benefits to humans including: habitat for wildlife, prevention of coastline erosion, and mitigation of natural disasters. One step to preserve their ecological functions is to identify and protect the source of their nitrogen (N). Nitrogen stable isotopes were sampled for one year beginning August 2018 and used as tracers to identify how mangroves obtain N. Total N in (A. germinans) and associated (Batis maritima) (plants) (2.1%) was more abundant than in cyanobacteria (0.6%) and sediment (0.1%). Plant d15N signatures (5.52‰) were more similar to sediment (5.21‰) than cyanobacteria (1.98‰), suggesting A. germinans obtain N from sediment and/or plants and sediment obtain N from sources other than cyanobacteria. Nutrient content indicates that seedlings growing in (B. maritima) vegetation patches are more similar to adult mangroves, suggesting vegetation is beneficial to young mangroves and should be considered in transplanting events.
Murphy, Ashley Elizabeth, "Identifying the N Sources for Black Mangrove (Avicennia germinans) in a South Texas Mangrove Forest" (2019). Theses and Dissertations - UTRGV. 554.