Caracterización del fitoplancton en Puerto Hondo durante la época húmeda (Noviembre 2021 a Abril 2022)
Fecha
2023
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Facultad de Ciencias Naturales. Universidad de Guayaquil
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Este estudio caracteriza la variabilidad del fitoplancton y su relación con las variables ambientales en dos estaciones fijas en Puerto Hondo, dos veces por mes, desde noviembre 2021 a abril 2022, que correspondió en su mayor parte a la época lluviosa durante la fase de aguajes y pleamar. Se realizaron arrastres superficiales con red 50 μm de fitoplancton por diez minutos con velocidad de 2 nudos de la lancha; se colectó muestras de agua para nutrientes; la salinidad, temperatura y transparencia se midieron in situ. La comunidad del fitoplancton se caracterizó con un total de 43 especies distribuidas en 26 diatomeas (15 céntricas y 11 pennadas), 6 dinoflagelados, 1 cianobacteria, 1 clorofita, 1 euglenofita, 1 ciliado y 7 tintínidos; con diversidad promedio ligeramente más alta en E2. La mayor abundancia algal correspondió a las diatomeas céntricas prevaleciendo Coscinodiscus granii, seguido del tintínido con Tintinopsis dadayi en ambas estaciones. El índice de Shannon evidenció una diversidad media, mientras que el índice de equidad mostró una comunidad fitoplanctónica heterogénea en el estuario. La relación del fitoplancton con los parámetros ambientales (ACC), mostró variaciones que influenciaron el desarrollo de las diatomeas céntricas estrechamente relacionadas con el silicato, nitrato y fosfato (E1) y con el silicato (E2), aún en la época lluviosa y en fase de pleamar-aguajes.
This study characterizes the variability of phytoplankton and its relationship with environmental variables at two fixed stations in Puerto Hondo, twice a month, from November 2021 to April 2022, which corresponded mostly to the rainy season during the high tide and high tide phase. Surface trawls were conducted with 50 μm net of phytoplankton for ten minutes at a speed of 2 knots from the boat; water samples were collected for nutrients; salinity, temperature and transparency were measured in situ. The phytoplankton community was characterized with a total of 43 species distributed in 26 diatoms (15 centric and 11 pennate), 6 dinoflagellates, 1 cyanobacteria, 1 chlorophyte, 1 euglenophyte, 1 ciliate and 7 tintinids; with slightly higher average diversity in E2. The highest algal abundance corresponded to centric diatoms with Coscinodiscus granii prevailing, followed by tintinids with Tintinopsis dadayi in both stations. The Shannon index evidenced a medium diversity, while the equity index showed a heterogeneous phytoplankton community in the estuary. The relationship of phytoplankton with environmental parameters (ACC), showed variations that influenced the development of centric diatoms closely related to silicate, nitrate and phosphate (E1) and to silicate (E2), even in the rainy season and in the high tide-water phase.
This study characterizes the variability of phytoplankton and its relationship with environmental variables at two fixed stations in Puerto Hondo, twice a month, from November 2021 to April 2022, which corresponded mostly to the rainy season during the high tide and high tide phase. Surface trawls were conducted with 50 μm net of phytoplankton for ten minutes at a speed of 2 knots from the boat; water samples were collected for nutrients; salinity, temperature and transparency were measured in situ. The phytoplankton community was characterized with a total of 43 species distributed in 26 diatoms (15 centric and 11 pennate), 6 dinoflagellates, 1 cyanobacteria, 1 chlorophyte, 1 euglenophyte, 1 ciliate and 7 tintinids; with slightly higher average diversity in E2. The highest algal abundance corresponded to centric diatoms with Coscinodiscus granii prevailing, followed by tintinids with Tintinopsis dadayi in both stations. The Shannon index evidenced a medium diversity, while the equity index showed a heterogeneous phytoplankton community in the estuary. The relationship of phytoplankton with environmental parameters (ACC), showed variations that influenced the development of centric diatoms closely related to silicate, nitrate and phosphate (E1) and to silicate (E2), even in the rainy season and in the high tide-water phase.
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FITOPLANCTON, ESTUARIO, AGUAJES-PLEAMAR, ESTERO SALADO, NUTRIENTES