Spatiotemporal Patterns in the Biomass of Drift Macroalgae in the Indian River Lagoon, Florida, United States

Frontiers in Marine Science

Bernhard Riegl¹  Richard Paperno²  M. Dennis Hanisak³  Robert W. Virnstein⁴  Lori J. Morris⁵  Robert H. Chamberlain⁵  Ali Simpson⁵  L. Rex Ellis⁵  Charles A. Jacoby⁵  Lauren M. Hall⁶ 

[1] Department of Marine and Environmental Sciences, Halmos College of Arts and Sciences, Nova Southeastern University, Dania Beach, FL, United States;Florida Fish and Wildlife Conservation Commission, Melbourne, FL, United States;Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, FL, United States;Seagrass Ecosystems Analysts, Gainesville, FL, United States;St. Johns River Water Management District, Palatka, FL, United States;St. Johns River Water Management District, Palm Bay, FL, United States;

关键词: abundance;    physiological tolerance;    nutrient content;    nutrient cycling;    habitat suitability;   

DOI  :  10.3389/fmars.2022.767440

来源: DOAJ

【 摘 要 】

Drift macroalgae plays key roles in the ecology of many coastal systems, including the Indian River Lagoon. In the lagoon, changes in the biomass of drift macroalgae may have interacted with an unprecedented bloom of phytoplankton in 2011. Patterns in the biomass of drift macroalgae were identified using new and original analyses of data from several sampling programs collected between 1997 and 2019. All available data show a relatively low biomass of drift macroalgae in 2010–2012, and surveys of fixed transects and seining as part of a fisheries independent monitoring program also recorded low biomass in 2016. Low light availability and potentially stressful temperatures appeared to be the main influences as indicated by the results of incubations in tanks to determine environmental tolerances and data on ambient conditions. Decreased biomass of drift macroalgae had implications for cycling of nutrients because carbon, nitrogen, and phosphorus not stored in the tissues of drift macroalgae became available for uptake by other primary producers, including phytoplankton. The estimated 14–18% increases in concentrations of these elements in the IRL could have promoted longer and more intense phytoplankton blooms, which would have reduced light availability and increased stress on algae and seagrasses. An improved understanding of such feedback and the ecological roles played by drift macroalgae will support more effective management of nutrient loads and the system by accounting for cycling of nutrients among primary producers.

【 授权许可】

Unknown