Influence of environmental factors on the contents of free amino acids in Fucus vesiculosus in the Barents Sea during the day

Abstract

Influence of main environmental factors (temperature, intensity of photosynthetically active radiation and tidal cycle) on the contents of free amino acids (FAAs) in Fucus vesiculosus in the Barents Sea during the day was investigated. An undular change in the content of FAAs occurs during the day, associated with the phases of the tidal cycle. Temperature and photosynthetically active radiation influenced the content of FAAs, but their relation probably is a nonlinear. The content of most of FAAs and their total amount reached the highest values at a minimum water level. The lowest values were determined when algae were in seawater. The difference in the content of individual FAAs and their common amounts averaged 1.5-3 times during the day. The reason for the changes in the content of FAAs is probably related to the metabolic processes and their switching during the transition of algae from an aquatic environment to an air and vice versa.