Microphytoplancton in the Baía de Todos Os Santos (Brazil): Composition, diversity and abundance in a short period of time
DOI:
https://doi.org/10.24310/abm.v45i.5301Keywords:
Todos os Santos Bay, diatoms, potentially harmful species, marine microalgae, Salvador - BahiaAbstract
In this work we present the characterization of the microphytoplankton assembly in the Baía de Todos os Santos, considering the local abiotic conditions, in short time series, in order to increase the knowledge about the composition, diversity and distribution patterns of phytoplankton in the bay. Samples were taken on three consecutive days, September 2016, in five points distributed in the northeast sector of the bay. The temperature, salinity, dissolved oxygen and water transparency were measured in situ. Samples (1L) were collected in subsurface (~ 0.5 m), for microphytoplankton quantitative analyzes. The species were identified based on specialized literature and quantitative analyzes were performed using the Utermöhl method. The abiotic variables evidenced a homogeneous environment, with a mass of hot and saline water, typically marine. A total of 104 taxa were identified, with diatoms showing the highest species richness and abundance, demonstrating a typical pattern found in tropical estuarine systems. Considering the importance of the composition and structure of the phytoplankton community for the ecological balance of the bay and the maintenance of ecosystem services, we highlight the occurrence of potentially harmful species, capable of causing damage to the system in the event of blooms, such as occurred at the time of bloom of Akashiwo sanguinea in the year 2007.
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