Spatial and Temporal Diversity of Cyanometabolites in the Eutrophic Curonian Lagoon (SE Baltic Sea)

This work aims to determine the profiles of cyanopeptides and anatoxin synthetized by cyanobacteria in Lithuanian part Curonian Lagoon (SE Baltic Sea) characterize their spatial temporal patterns this ecosystem. Cyanometabolites were analysed a LC-MS/MS system coupled hybrid triple quadrupole/linear ion trap mass spectrometer. During investigation period (2013–2017), 10 microcystins, nodularin, anatoxin-a, 16 anabaenopeptins, including 1 oscillamide, 12 aeruginosins, aeruginosamide, 3 cyanopeptolins 4 microginins detected. The most frequently detected metabolites found at all investigated sites. Demethylated microcystin variants anabaenopeptins had strongest relationship with Planktothrix agardhii, while non-demethylated Microcystis spp. Low concentrations some microcystins: [Asp3]MC-RR, MC-RR, MC-LR, as well few other cyanopeptides: AP-A AEG-A during cold (December–March). Over study period, Aphanizomenon, main dominant species, Planktothrix, Microcystis, Dolichospermum potentially producers samples from Lagoon.