Potential Polyunsaturated Aldehydes in the Strait of Gibraltar under Two Tidal Regimes

Marine Drugs

Eduardo Ramírez-Romero¹  Ana Bartual¹  Soledad Morillo-García¹  Fidel Echevarría¹  Nerea Valcárcel-Pérez¹  Carlos M. García¹  Andrés Cózar¹  María J. Ortega²  Diego Macías³ 

[1] Department of Biology, University of Cádiz, Avda. República Saharaui s/n., Puerto Real,Cádiz 11510, Spain;Department of Organic Chemistry, University of Cádiz, Avda. República Saharaui s/n.,Puerto Real, Cádiz 11510, Spain;Institute for Environment and Sustainability, Joint Research Center, European Commission,Via E. Fermi, 2147, Ispra, Varese 21021, Italy;

关键词: polyunsaturated aldehydes;    diatoms;    physiological stress;    Strait of Gibraltar;    heptadienal;    octadienal;    decadienal;   

DOI  :  10.3390/md12031438

来源: DOAJ

【 摘 要 】

Diatoms, a major component of the large-sized phytoplankton, are able to produce and release polyunsaturated aldehydes after cell disruption (potential PUAs or pPUA). These organisms are dominant in the large phytoplankton fraction (>10 µm) in the Strait of Gibraltar, the only connection between the Mediterranean Sea and the Atlantic Ocean. In this area, the hydrodynamics exerts a strong control on the composition and physiological state of the phytoplankton. This environment offers a great opportunity to analyze and compare the little known distribution of larger sized PUA producers innature and, moreover, to study how environmental variables could affect the ranges and potential distribution of these compounds. Our results showed that, at both tidal regimes studied (Spring and Neap tides), diatoms in the Strait of Gibraltar are able to producethree aldehydes: Heptadienal, Octadienal and Decadienal, with a significant dominance of Decadienal production. The PUA released by mechanical cell disruption of large-sized collected cells (pPUA) ranged from 0.01 to 12.3 pmol from cells in 1 L, and from0.1 to 9.8 fmol cell−1. Tidal regime affected the abundance, distribution and the level of physiological stress of diatoms in the Strait. During Spring tides, diatoms were more abundant, usually grouped nearer the coastal basin and showed less physiological stress than during Neap tides. Our results suggest a significant general increase in the pPUA productivity with increasing physiological stress for the cell also significantly associated to low nitrate availability.

【 授权许可】

Unknown