Raimundi Rivera, Koralys M.

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    Distribución y concentración de las poblaciones de Pyrodinium bahamense en Laguna Grande, Las Cabezas de San Juan, Fajardo, Puerto Rico
    (2015) Raimundi Rivera, Koralys M.; González Lagoa, Juan G.; College of Arts and Sciences - Sciences; Armstrong, Roy; Otero Morales, Ernesto; Corredor, Jorge; Department of Marine Sciences; Alfaro, Mónica
    Laguna Grande is part of The Natural Reserve of Las Cabezas de San Juan, Fajardo, Puerto Rico. It has been a tourist and scientific attraction because it presents the phenomenon of bioluminescence all the year round. Laguna Grande is substantially different from other bioluminescent bays in the area in terms of physiographic characteristics. Therefore, it is suspected that it may have a different type of densification mechanism to sustain or support the population of bioluminescent organisms and other species of phytoplankton. During this study three samples were taken in days or nights of major displacement of water (new or full moon) with the principal aim to verify if the water movement among the high tide and the low tide has any effect in the population dynamics of Pyrodinium bahamense var bahamense and Ceratium furca in Laguna Grande. The phytoplankton samples were collected from a matrix of five stations in the bay and three in the canal that connects to the Atlantic Ocean, samples were collected in triplicate and analyzed to measure the population density of dinoflagellates at two different depths (0m-2m). Data of the stations that surrounds and those in the channel demonstrate that during the tidal cycle more organisms are carried with the current out of the bay than the ones returning. However, the population of dinoflagellates inside the bay does not change much. Based on the statistical tests used, it is assumed that the organisms have the ability to keep inside the bay along the water column. That is, they do not seem to remain near the surface only.