Impact of Phycosphere-Isolated Marine Bacteria on Nutritional Value, Growth, and Nutrient Uptake of Co-Cultured Chaetoceros calcitrans

Mélissa Angeline Liberia Gonçalves, Melissa López-Vela (), Alejandro Palacios-Espinosa, Mirella Romero-Bastidas, Maurilia Rojas-Contreras and Paola Magallón-Servín ()
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Mélissa Angeline Liberia Gonçalves: Department of Marine and Coastal Sciences, Universidad Autónoma de Baja California Sur, La Paz 23085, Baja California Sur, Mexico
Melissa López-Vela: Aquaculture Department, Centro de Investigaciones Biológicas del Noroeste, La Paz 23096, Baja California Sur, Mexico
Alejandro Palacios-Espinosa: Academic Department of Animal Science and Habitat Conservation, Universidad Autónoma de Baja California Sur, La Paz 23085, Baja California Sur, Mexico
Mirella Romero-Bastidas: Academic Department of Agronomy, Universidad Autónoma de Baja California Sur, La Paz 23085, Baja California Sur, Mexico
Maurilia Rojas-Contreras: Academic Department of Agronomy, Universidad Autónoma de Baja California Sur, La Paz 23085, Baja California Sur, Mexico
Paola Magallón-Servín: Aquaculture Department, Centro de Investigaciones Biológicas del Noroeste, La Paz 23096, Baja California Sur, Mexico

Resources, 2024, vol. 13, issue 9, 1-13

Abstract: Microalgae offer distinct advantages as a nutritional source for aquaculture and as a means of wastewater bioremediation. Studying the phycosphere bacteria and understanding their complex interactions is essential to optimizing high-quality biomass growth. This study aimed to isolate, characterize, and identify bacteria from the phycosphere of marine microalgae and to determine their potential to enhance growth, metabolism, and bioremediation capabilities of Chaetoceros calcitrans in stress nutrient-poor media simulating aquaculture wastewater enriched with nitrate, nitrite, or phosphorus. Bacterial characterization included tests for auxin and siderophore production, biofilm formation, amylase activity, phosphate solubilization, mobility, and antagonism evaluation. When Alteromonas macleodii , Bacillus cereus , and Marinobacter sp. were selected and then enriched (10 7 CFU/mL) in co-culture with C. calcitrans , growth levels significantly increased in four of six Synthetic Aquaculture Wastewater (SAW) media. Pigment levels were higher in five of six SAW media, and lipid levels were higher in SAW rich in nitrite (SAWni50) and phosphorus (SAWpho50). In addition, C. calcitrans with or without the bacterial consortium demonstrated excellent phosphorus bioremediation, achieving 67.6% average removal in SAWpho50. Nitrate and nitrite assimilation rates were approximately 10% in SAWna and SAWni50. This study marks the inaugural identification of these bacteria as microalga growth-promoting bacteria (MGPB) for enhancing growth and lipid and pigment production in C. calcitrans , and it also documents a maximum of 69.13% phosphorus removal.

Keywords: bacterial enrichment; phycoremediation; marine microalgae; wastewater; aquaculture (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2024
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