First Report on the Bloom of Diatom Haslea Gretharum Simonsen, 1974 from the Arabian Sea

Thomas, Lathika Cicily; Nandan, S. Bijoy; Padmakumar, K. B.

doi:10.1007/s41208-021-00369-2

Cited by 1 publication

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“…blooms were regularly observed in summer months, but the species involved were not identified ( [11], Y. Hardivillier and J. Séveno's personal observations). It is noteworthy that in the Arabian Sea in March 2011, a planktonic bloom of the non-blue species, Haslea gretharum Simonsen, has been observed [12].…”

Section: Introductionmentioning

confidence: 99%

Benthic Diatom Blooms of Blue Haslea spp. in the Mediterranean Sea

Seveno,

Car,

Sirjacobs

et al. 2023

Marine Drugs

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Blue Haslea species are marine benthic pennate diatoms able to synthesize a blue-green water-soluble pigment, like marennine produced by H. ostrearia Simonsen. New species of Haslea synthetizing blue pigments were recently described (H. karadagensis, H. nusantara, H. provincialis and H. silbo). Their marennine-like pigments have allelopathic, antioxidative, antiviral and antibacterial properties, which have been demonstrated in laboratory conditions. Marennine is also responsible for the greening of oysters, for example, in the Marennes Oléron area (France), a phenomenon that has economical and patrimonial values. While blue Haslea spp. blooms have been episodically observed in natural environments (e.g., France, Croatia, USA), their dynamics have only been investigated in oyster ponds. This work is the first description of blue Haslea spp. benthic blooms that develop in open environments on the periphyton, covering turf and some macroalgae-like Padina. Different sites were monitored in the Mediterranean Sea (Corsica, France and Croatia) and two different blue Haslea species involved in these blooms were identified: H. ostrearia and H. provincialis. A non-blue Haslea species was also occasionally encountered. The benthic blooms of blue Haslea followed the phytoplankton spring bloom and occurred in shallow calm waters, possibly indicating a prominent role of light to initiate the blooms. In the absence of very strong winds and water currents that can possibly disaggregate the blue biofilm, the end of blooms coincided with the warming of the upper water masses, which might be profitable for other microorganisms and ultimately lead to a shift in the biofilm community.

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Section: Introductionmentioning

confidence: 99%