Winter Bloom of Marine Cyanobacterium, Trichodesmium erythraeum and Its Relation to Environmental Factors

Nowrin Akter Shaika, Eman Alhomaidi, Md. Milon Sarker, Abdullah An Nur, Md. Ashfaq Sadat, Sadiqul Awal, Golam Mostafa, Shanur Jahedul Hasan, Yahia Mahmud and Saleha Khan ()
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Nowrin Akter Shaika: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Eman Alhomaidi: Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia
Md. Milon Sarker: Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh
Abdullah An Nur: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Md. Ashfaq Sadat: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Sadiqul Awal: Department of Arts, Education & Agri-Tech, Melbourne Polytechnic, Epping, VIC 3076, Australia
Golam Mostafa: Bangladesh Fisheries Research Institute, Mymensingh 2202, Bangladesh
Shanur Jahedul Hasan: Bangladesh Fisheries Research Institute, Mymensingh 2202, Bangladesh
Yahia Mahmud: Bangladesh Fisheries Research Institute, Mymensingh 2202, Bangladesh
Saleha Khan: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Sustainability, 2023, vol. 15, issue 2, 1-15

Abstract: A winter bloom event of Trichodesmium erythraeum was monitored for the first time in the southeastern coastal parts of Bangladesh along the Bay of Bengal. This study presents the brownish to light pinkish bloom that appeared in mid-winter and disappeared abruptly during spring. Heavy blooms of T. erythraeum revealed the highest concentration of 91.47 ± 52.94 × 10 3 colonies/L in the Bakkhali River Estuary, and 66.93 ± 12.95 × 10 3 colonies/L in the Maheshkhali Channel of the Bay of Bengal. Three distinct morphological shapes, namely puffs, tufts and asymmetrical colonies, were depicted as major types. Several environmental factors, such as water temperature, salinity, pH, dissolved oxygen, NO 3 –N and PO 4 –P, were analyzed to determine their relationship with the occurrence, abundance and bloom formation of T. erythraeum . The abundance of the species showed a positive correlation with salinity and pH while exhibiting a negative correlation with temperature and DO. A cluster analysis revealed a clear indication of T. erythraeum bloom during winter. Thus, the prevalence of the highest density of the bloom in the present study area strongly suggests increased monitoring and research efforts in order to effectively manage or impede harmful algal blooms.

Keywords: winter algal bloom; Trichodesmium erythraeum; plankton abundance; environmental factors (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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