Impacts of floating Sargassum accumulation on the fringing mangrove Rhizophora mangle in southwestern Puerto Rico: A case study

dc.contributor.advisor Armstrong, Roy A. Perez Perez, Jenniffer College of Arts and Sciences - Sciences en_US
dc.contributor.committee Cruz Motta, Juan J.
dc.contributor.committee Hernández López, William J.
dc.contributor.department Department of Marine Sciences en_US
dc.contributor.representative Morales Payán, José P. 2022-12-21T18:22:39Z 2022-12-21T18:22:39Z 2022-12-13
dc.description.abstract Satellite images have shown massive amounts of drifting pelagic Sargassum spp. affecting the Caribbean islands since 2011. High-resolution satellite images have been used from January 2015 to 2021 to identify influxes and accumulation of Sargassum in Southwest Puerto Rico. The Floating Algae Index (FAI) was applied to Sentinel 2A Multi-spectral Instrument (MSI) imagery to identify drifting pelagic Sargassum in the La Parguera Natural Reserve (LPNR). The purpose of this study was to assess the long-term (chronic impacts) of Sargassum accumulation on fringing red mangroves. Sampling trips were conducted every 14 days since May 2019 to assess Rhizophora mangle (red mangroves) litterfall primary productivity at six sampling sites along the coast where Sargassum accumulates. Physical and biogeochemical parameters of the water column were studied before and after Sargassum arrivals for trends in light penetration, chlorophyll concentration, colored dissolved organic matter, pH, dissolved oxygen salinity and temperature at these sites. The mangroves at Isla Guayacán had the highest Sargassum accumulation with the lowest litterfall primary production of all sampling sites. Field observations and satellite data showed high mangrove mortality at this location. Sites that contained Sargassum accumulation had the lowest litterfall production, which can be attributed to anoxic conditions caused by Sargassum accumulations. en_US
dc.description.abstract Desde el 2011, imágenes de satélite han evidenciado afluencias de Sargassum afectando las islas del Caribe. Imágenes de satélite de alta resolución se utilizaron desde enero 2015 hasta el 2021 para identificar afluencias y acumulaciones de Sargassum en el suroeste de Puerto Rico. El índice de algas flotantes (“Floating Algae Index”, o FAI) fue aplicado a imágenes multiespectrales de Sentinel 2 para identificar la entrada de Sargassum a la Reserva Natural de La Parguera. El propósito de este estudio es el monitorear impactos a largo plazo de acumulaciones de Sargassum en manglares costeros. Se realizo mediciones de campo cada 14 días desde mayo 2019 para monitorear la producción primaria de Rhizophora mangle en 6 lugares de interés donde el Sargassum se acumula. Parámetros físicos y biogeoquímicos de la columna de agua se estudiaron antes y después de estos eventos de Sargassum para medir concentraciones de clorofila, materia orgánica disuelta coloreada, pH, oxígeno disuelto, salinidad y temperatura. Los mangles de Isla Guayacán presentaron acumulación masiva de Sargassum, con los valores más bajos en producción primaria, oxígeno disuelto, y pH. Observaciones de campo y de satélite presentaron alta mortalidad de mangles en esta localización. Las areas de mayor acumulacion de Sargassum tuvieron los valores mas bajos de produccion de hojarasca, lo cual puede ser atribuido a las condiciones anoxicas causadas por la acumulacion de Sargassum. en_US
dc.description.graduationSemester Fall en_US
dc.description.graduationYear 2022 en_US
dc.description.sponsorship This study is supported and monitored by The National Oceanic and Atmospheric Administration– Cooperative Science Center for Earth System Sciences and Remote Sensing Technologies under the Cooperative Agreement Grant #: NA16SEC4810008. The author would like to thank The City College of New York, NOAA Center for Earth System Sciences and Remote Sensing Technologies, and NOAA Office of Education, Educational Partnership Program for full fellowship support for Jenniffer Perez Perez. The statements contained within the Story Map are not the opinions of the funding agency or the U.S. government, but reflect the author’s opinions. NASA Minority University Research and Education Project. Grant #: 80NSSC21K1701. en_US
dc.language.iso en en_US
dc.rights Attribution-NonCommercial 4.0 International *
dc.rights.holder (c) 2022 Jenniffer Pérez Pérez en_US
dc.rights.uri *
dc.subject Sentinel en_US
dc.subject Fai en_US
dc.subject Sargassum en_US
dc.subject.lcsh Sargassum - Caribbean Sea
dc.subject.lcsh Red mangrove - Mortality
dc.subject.lcsh Mangrove conservation
dc.title Impacts of floating Sargassum accumulation on the fringing mangrove Rhizophora mangle in southwestern Puerto Rico: A case study en_US
dc.type Thesis en_US
dspace.entity.type Publication Marine Sciences en_US M.S. en_US
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