RT journal article
T1 Types and Distribution of Bioactive Polyunsaturated Aldehydes in a Gradient from Mesotrophic to OligotrophicWaters in the Alborán Sea (Western Mediterranean)
A1 Bartual Magro, Ana
A1 Hernanz Torrijos, María
A1 Sala, Iria
A1 Ortega Agüera, María Jesús
A1 González García, Cristina
A1 Bolado Penagos, Marina
A1 López Urrutia, Angel
A1 Romero Martínez, Leonardo
A1 Lubián, Luis M.
A1 Bruno Mejías, Miguel
A1 Echevarría Navas, Fidel María
A1 García Jiménez, Carlos Manuel
A2 Biología
A2 Física Aplicada
A2 Química Orgánica
K1 Alboran Sea; diatoms; oligotrophy; oxylipins; polyunsaturated aldehydes; PUA
K1 Alboran Sea
K1 diatoms
K1 oligotrophy
K1 oxylipins
K1 polyunsaturated aldehydes
K1 PUA
AB Polyunsaturated aldehydes (PUAs) are bioactive molecules suggested as chemical defenses and infochemicals. In marine coastal habitats, diatoms reach high PUA production levels during bloom episodes. Two fractions of PUA can usually be analyzed: pPUA obtained via artificial breakage of collected phytoplankton cells and dissolved PUA already released to the environment (dPUA). In nature, resource supply arises as a main environmental controlling factor of PUA production. In this work, we monitored the vertical distribution and daily variation of pPUA associated with large-size phytoplankton and dPUA, at three sites located in the Alboran Sea from mesotrophic to oligotrophic waters. The results corroborate the presence of large-size PUA producers in oligotrophic and mesotrophic waters with a significant (58%-85%) diatom biomass. In addition to diatoms, significant correlations between pPUA production and dinoflagellate and silicoflagellate abundance were observed. 2E,4E/Z-Heptadienal was the most abundant aldehyde at the three sites with higher values (17.1 fg center dot cell(-1)) at the most oligotrophic site. 2E,4E/Z-Decadienal was the least abundant aldehyde, decreasing toward the oligotrophic site. For the first time, we describe the daily fluctuation of pPUA attributable to cellular physiological state and not exclusively to taxonomical composition. Our results demonstrate the persistence of threshold levels of dPUA deep in the water column, as well as the different chromatographic profiles of dPUA compared with pPUA. We propose different isomerization processes that alter the chemical structure of the released PUAs with unknown effects on their stability, biological function, and potential bioactivity.
PB MDPI
SN 1660-3397
YR 2020
FD 2020-03
LK http://hdl.handle.net/10498/22792
UL http://hdl.handle.net/10498/22792
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026